So..I put OEM SR20DE 9.5:1 pistons in my SR20DET...

[kovert240sx]

So to be honest..It wasn't intentional, but interesting that it kinda worked anyway.

A couple years back i had a machine shop do the assembly on a rebuild and they said they could also order the factory pistons.

Without thinking what that meant, I went ahead with it. ( I intended to put factory DET pistons in it ).


After the engine was complete I had it dyno tuned on a mustang dyno with the following:

Stock rods
Stock injectors
Stock fuel system aside from Z32 filter / walbro pump, also stock fuel pressure.
Stock intake manifold.
Nistune
HKS GT2510
256/256 cams
Tubular bottom mount manifold w/ full exhaust
91 octane gas @ 17psi

Results:

366whp / 310ft lbs tq

I was maxing out the injectors so the low boost = low tq.

I ended up having my drain plug back itself out on the dyno that day, lost all oil and killed the turbo.

fast forward 2 years: at some point during a injector upgrade/turbo swap, or maybe even the same day I killed the turbo..my ( DET ) piston rings are toast.

Pulled the head yesterday and discovered my mistake from the build.

Even though it wasn't intentional, i figured I'd share anyway as I've never heard of it being attempted.

[jr_ss]

People put high comp pistons in all the time, perhaps not our motors, but it's not unheard of.

[kovert240sx]

People put high comp pistons in all the time, perhaps not our motors, but it's not unheard of.

Obviously, but I had never heard of anyone using SR20DE oem pistons in a DET.

[hobbs]

Not like the B/P chassis guys have been putting turbos on their DEs for the last 20 years. You must be the first one ever to do this.

[kovert240sx]

Not like the B/P chassis guys have been putting turbos on their DEs for the last 20 years. You must be the first one ever to do this.

holy shit, did you even read my last comment?

[hobbs]

holy shit, did you even read my last comment?

I did but can't seem to care. Again, putting 9:5:1 compression pistons in any SR20 has been done for the last 20 years, you've done something that thousands of other people have done, wooo!

[kovert240sx]

I did but can't seem to care. Again, putting 9:5:1 compression pistons in any SR20 has been done for the last 20 years, you've done something that thousands of other people have done, wooo!

You can't seem to care that you're avoiding my point all together?

Lets recap for the dunce: OEM high comp NA pistons in a DET - I've yet to see done once, let alone THOUSANDS of times.
:picardfp:

[hobbs]

Lets recap for the dunce

I sure am, although you can't seem to grasp the concept that 9:5:1 is the same CR whether it be in a DET block or DE block and will make the same power regardless which block it is in. So yes, your DET with DE pistons will make the same power as a DE with DE pistons with the same mods.

The fact that DET's have oil squirters and sodium filled exhaust valves does not affect the compression radios and thus will not affect the power output like a higher compression would.

But since you really want to have the title of being the first one of putting DE pistons in a DET, go for it, I won't tell anyone you're 20 years late to the party.

[kovert240sx]

I sure am, although you can't seem to grasp the concept that 9:5:1 is the same CR whether it be in a DET block or DE block and will make the same power regardless which block it is in. So yes, your DET with DE pistons will make the same power as a DE with DE pistons with the same mods.

The fact that DET's have oil squirters and sodium filled exhaust valves does not affect the compression radios and thus will not affect the power output like a higher compression would.

But since you really want to have the title of being the first one of putting DE pistons in a DET, go for it, I won't tell anyone you're 20 years late to the party.

I could care less about a title, or being the "first". My intention wasn't to turn this into some cool guy pissing contest.

[kruked]

I could care less about a title, or being the "first". My intention wasn't to turn this into some cool guy pissing contest.

Can I join the pissing contest? I like setting records.

[Dboyizmlg]

Wait a second... You made 366whp on a mustang dyno with STOCK INJECTORS!?
I find that very hard to believe!

[5280VertDET]

Wait a second... You made 366whp on a mustang dyno with STOCK INJECTORS!?
I find that very hard to believe!

Maybe 266? Sounds more likely. On my FWD JDM SR20DET with 370s & T25 I made 249...

[RalliartRsX]

Those stock injectors (assuming 370cc) run out of physical flow around 250WHP.

They are not PHYSICALLY capable of 366WHP

And also, how the hell are you making more than 300WHP on a T25 based turbo??

Da Fuq?!?! I think Hobbs not caring is the fact that he also smells bullshit in your storyline........... :rolleyes:

[Dboyizmlg]

Those stock injectors (assuming 370cc) run out of physical flow around 250WHP.

They are not PHYSICALLY capable of 366WHP

And also, how the hell are you making more than 300WHP on a T25 based turbo??

Da Fuq?!?! I think Hobbs not caring is the fact that he also smells bullshit in your storyline........... :rolleyes:

^^ my point exactly.

[Frank_Jaeger]

Wait a second... You made 366whp on a mustang dyno with STOCK INJECTORS!?
I find that very hard to believe!
It doesn't say what injectors he has, only that he's maxing them out. Reading comprehension.

EDIT: Nevermind I fail. It definitely says stock injectors. DE Pistons are magic.

TqqB8NjcKJU

[hobbs]

Those stock injectors (assuming 370cc) run out of physical flow around 250WHP.

They are not PHYSICALLY capable of 366WHP

And also, how the hell are you making more than 300WHP on a T25 based turbo??

Da Fuq?!?! I think Hobbs not caring is the fact that he also smells bullshit in your storyline........... :rolleyes:

It was more the fact that this guy thinks hes the first one to do a 9:5:1 build, his mod list is even more a joke when you look at the posted numbers.

[Def]

Those stock injectors (assuming 370cc) run out of physical flow around 250WHP.

They are not PHYSICALLY capable of 366WHP

And also, how the hell are you making more than 300WHP on a T25 based turbo??

Da Fuq?!?! I think Hobbs not caring is the fact that he also smells bullshit in your storyline........... :rolleyes:

Injectors obviously make this BS. You will be close to maxing out 550 cc injectors at that power level on E10.

But the HKS GT2510 is essentially a stock S14/S15 'T28' aka GT2560R. It can do 300 rwhp with the wick turned up, even on stock cams.

A GT2871R is still a "T25 based turbo" and it'll do over 400 rwhp when pushed really hard.

[hobbs]

A GT2871R is still a "T25 based turbo" and it'll do over 400 rwhp when pushed really hard.

Actually it's not, it's a T2 biased turbo, the T2 housing was around before the T25 series came out. Just because it can be made to fit a T2 housing does not mean anything, considering the T25 and GT2871R have very little in common other than it can be mated to the same exhaust housing flange.

[RalliartRsX]

I see what both Hobbs and Def are saying

Def, Me as well as yourself know if we look at the compressor maps for what is essentially a glorified T28, it would refute his statements IMMEDIATELY..........but since people (especially the original poster) on here have NO EFFING CLUE on what those are, I kept it simple for the masses :)

For the masses: At 366WHP, that is 400+ Crank HP, and not many "T2" framed turbos are capable of that type of flow, ESPECIALLY this turbo.

This scenario right here is why Zilvia is such a shit show.........

[zerodameaon]

Someone got caught with their hand in the bullshit jar.

[!Zar!]

I heard we were whipping out dicks?

[cotbu]

I heard we were whipping out dicks?
Is it that time of the year already!
Dicks out, In April!

[Dboyizmlg]

His entire mod list is screwed up!

OP there is no way you can make those numbers on a MUSTANG DYNO with the list you posted.

Why did you make this thread!?
Troll? Or are you really lacking some knowledge?

[kovert240sx]

First of all, Hobbs and def and rally whatever the fuck.. You guys are fucking idiots. Period.

Injectors are rated based on fuel pressure. Increasing that pressure increases flow. Any dip ship knows this. So to claim that 370s are not capable of flowing whatever bullshit number you pulled out of your ass proves my first point.

Second, whichever one of you idiots claimed t2 based turbos cant make 400hp. FYI t25 and t28 are BOTH t2 turbos!

Look at a fucking compressor map...pretty simple to figure out you have no fucking clue what your talking about.

If you want to have fun by jumping all over anyone with a low post count, be my guest, but at least have a slight clue what your saying first.

And to reiterate my reason for posting..this car was running oem sr20de pistons. I can't seem to get that across, OEM DE 9.5:1 Pistons!

Obviously you can get a plethora of aftermarket high comp pistons, my point was that I had never heard of these being used in a DET! And wanted to share my results, fuck me for trying to share.

I could give a fuck less if you guys thinking I'm bullshitting, It's no wonder why I stayed on FA before it went to shit.

You fuckin drift douches have bumped your heads too much, I've got dyno sheets and time slips to prove my claims, you guys can keep your bs knowledge and enjoy your group fuck session spewing with stupidity.

[kovert240sx]

And to clarify, I know that 366 sounds high for stock fuel pressure as my old car I had to crank it to supply enough fuel for 362whp. That was also the point of my post. Unless my 370s were remand in Japan and my kvalue ( calculated for 370/z32 maf ) magically worked with 11.5 afrs they are stock 370s and my hunch is the jump from 8.5 to 9.5 comp really makes that big of a difference in expected hp.

Also, my hks turbo was purchased used with its ID plate unreadable, I bought it as a 2510 but it obviously could have been any variation of a hks t2 flanged/ internally gated turbo.

[zerodameaon]

I just ran the numbers, you mean to tell me you are running 180 psi for your fuel pressure? Because that is what your above post about more psi = more power just said. That is at 90% duty cycle, at 100% duty cycle you would still be looking at 145 psi. Fun fact, 180 psi is about half way to the pressures found in a top fuel dragster fuel system, I am sure your SR20 is demanding that.

[kovert240sx]

I just ran the numbers, you mean to tell me you are running 180 psi for your fuel pressure? Because that is what your above post about more psi = more power just said. That is at 90% duty cycle, at 100% duty cycle you would still be looking at 145 psi. Fun fact, 180 psi is about half way to the pressures found in a top fuel dragster fuel system, I am sure your SR20 is demanding that.

Lol!
Lets ignore that most nissan 370s have been known to flow closer to 415cc..


[email protected] = [email protected]

Calculation for required cc for 380bhp is 442cc at 0.60 bsfc / 80psi


Not sure where you're getting this nonsense, but you can sit down now.

[zerodameaon]

A very bad calculator which I forgot was not very accurate. Anyways I have moved on to two others and those ones agree your numbers still fall short. You would still need to be running 120+ psi to get your power with those injectors. Attached are my sources this time, where is yours? Or is that what your power numbers were, just guesstimates?


Disclaimer, I did mess up those numbers but it was not going to benefit you any if I corrected them. I did not see that the HP numbers on those calculators are engine HP and not wheel.


EDIT: Yes fuck you for sharing. lol Anyways it would have been all cool and no one would have torn your thread to bits if you had just not lied about what you really have going on. People would have thought it was a good cheap way to get a few HP but when you claimed unicorns it was all going to go to hell.

[kovert240sx]

A very bad calculator which I forgot was not very accurate. Anyways I have moved on to two others and those ones agree your numbers still fall short. You would still need to be running 120+ psi to get your power with those injectors. Attached are my sources this time, where is yours? Or is that what your power numbers were, just guesstimates?


Disclaimer, I did mess up those numbers but it was not going to benefit you any if I corrected them. I did not see that the HP numbers on those calculators are engine HP and not wheel.

Hey Genius, Your calculators are using 43.5 as fuel pressure.

I think you're done here, Mr. top fuel.

Run along.
http://www.rceng.com/technical.aspx

[zerodameaon]

Oh I am not through with you yet, you are a straight up fucking moron, if you had a 640cc injector at 43.5 and you pumped it up to 120psi you would be looking at over 1000CC.

That is the required static flow rate, now if you go to the bottom of the page you get a nice little fuel flow calculator, where you can put in the old PSI and new PSI along with the old injector flow rate and it calculates you out a nice new flow rate at the higher PSI.

Now please tell me where I fucked up this time. Your calculator gives me almost the same info... shocking


For the sake of consistency I used 366 as the crank HP and 90% duty cycle.

[kovert240sx]

Oh I am not through with you yet, you are a straight up fucking moron, if you had a 640cc injector at 43.5 and you pumped it up to 120psi you would be looking at over 1000CC.

That is the required static flow rate, now if you go to the bottom of the page you get a nice little fuel flow calculator, where you can put in the old PSI and new PSI along with the old injector flow rate and it calculates you out a nice new flow rate at the higher PSI.

Now please tell me where I fucked up this time. Your calculator gives me almost the same info... shocking!

Ok..lets make this is super easy for you, ok?

Injectors are rated at 43.5psi ( common base fuel pressure )

What happens when you take a 370cc and crank up base fuel to 80psi? It becomes 501cc

How many cc does it take to make 380bhp at 80psi? 442cc albeit static

you fucking moron!

Just fuckin give up already, Jesus Christ..you've proven 3 fucking times you don't know what the hell your talking about.:bash:

[zerodameaon]

Lets use your calculator again(what the 4th time I have showed you your numbers are BULLCRAP). To get 366 crank HP at 43.5PSI you need 640cc injectors, so your 370cc injector turned up to 80psi(which it isn't you said STOCK FUEL PRESSURE) you get 501cc. So do the math, 640CC(at 43.5) needed minus 501cc(80) supplied equals 139cc missing... To get your 370s up to cover the missing ccs you would need to go another 50psi above your 80psi figure. So if you are using this calculator and getting only 442cc needed for 380hp you are forgetting to change from 6 injectors to 4 or some shit because it just doesn't work with 4cyl. Someone can't math but that is ok, not everyone can be smart. Your power numbers of 366 crank are still bullshit even by your numbers, try to prove me wrong all you want but even your math does not work with stock fuel pressure.

[kovert240sx]

Lets use your calculator again(what the 4th time I have showed you your numbers are BULLCRAP). To get 366 crank HP at 43.5PSI you need 640cc injectors, so your 370cc injector turned up to 80psi(which it isn't you said STOCK FUEL PRESSURE) you get 501cc. So do the math, 640CC needed minus 501cc supplied equals 139cc missing... So if you are using this calculator and getting only 442cc needed for 380hp you are forgetting to change from 6 injectors to 4 or some shit because it just doesn't work with 4cyl. Someone can't math but that is ok, not everyone can be smart.


Lol, didn't I say static? I did! What's that mean? Fully open!

Go ahead and put this in:
100% duty, 80psi @ bsfc what do you get? 442!

Now! This was an example to prove your top fuel garbage wrong.

I was running stock fuel pressure on this car, as I fucking said! ( my old car also did 360ish with cranked fuel pressure. So I know from experience, not just calculators that it works. )

I have 0 explanation for it myself. unless I have remand injectors that were on it when I bought the engine swap, but the car ran near perfect afrs with an injection multiplier calculated for z32 maf and 370cc injectors.

I'm not claiming some magic formula, just sharing my results from the information I have. Including dyno sheet...

[zerodameaon]

You never said 100% duty cycle, that makes sense, my numbers are just as correct as yours and leave that margin of safety. IDK why I did not consider you were not running them far beyond that safety, probably because its 3am. I never said your system was running top fuel dragster pressures, and I even came back and admitted that was wrong when I remembered that one calculator was horse shit. Also quit your talking about the dyno sheet and post it already, but that dyno sheet could be from anything so again with how little sense your Unicorn SR20 makes I am inclined to not believe it.

Either you have no clue what is really on or in your engine or you are making stuff up to cover up being called out on 370cc injectors, stock fuel pressure, and such and such turbo.

[kovert240sx]

You never said 100% duty cycle, that makes sense, my numbers are just as correct as yours and leave that margin of safety. IDK why I did not consider you were not running them far beyond that safety, probably because its 3am. I never said your system was running top fuel dragster pressures, and I even came back and admitted that was wrong when I remembered that one calculator was horse shit. Also quit your talking about the dyno sheet and post it already, but that dyno sheet could be from anything so again with how little sense your Unicorn SR20 makes I am inclined to not believe it.

Either you have no clue what is really on or in your engine or you are making stuff up to cover up being called out on 370cc injectors, stock fuel pressure, and such and such turbo.


Sorry I didn't put it into basic terms for you. I obviously posted this in the wrong place when a thread on how to install a key ring light is one of the most viewed posts.

No clue what the turbo was? I'll give you that.. I bought it as a 2510, but even I'll admit... I was in doubt after the dyno.

No clue I was running 9.5:1? Yup, also admitted.

Trying to get Internet points for false claims? No... Just sharing results from the information I had.

Fuck me for sharing.

[5280VertDET]

Seems to be a little foggy math on both sides, OP how sure are you that your motor came with stock 370s? I mean, could they have been upgraded in the mother land to 440 or 550s?

Also, OP, why do you think that this hasn't been posted before somewhere else; FWD sr's are running similar ratios, turbos and injections and have come no where close to this? Could it be the tune (which I may have missed you posting), the turbo or the dyno?

Buddy of mine ran 550s, GTiR t28 (I believe 15psi), factory FPR, walboro and emanage an put down 280 ish... On a JDM SR20DE(T) which has the same comp ratio. Granted this was at altitude too, but I believe the dyno may have been compensating for that too...

I am more curious than any thing, no offense, but I just want some information for the future of my SR.

THANKS.

[cespana]

70122

Enviado desde mi U9200 usando Tapatalk 2

[Def]

This shit stain is fucking hopeless.

You need more like 520-540 cc injectors running at 100% duty cycle (that still isn't technically static due to the lag time). You didn't get that out of a drop in pump and 370s.
You didn't make 360+ on a GT2510. You'd need at least a GT2530.

MAXIMUM theoretical thermodynamic efficiency gains going from 8.5 to 9.5:1 is on the order of 2.5-3%. Realistically on pump gas at this power level it's probably more like 1% max. Even on E85 you don't get the thermodynamic maximum gain due to extra pumping losses, more ring blow by etc.

And before you get all uppity OP, keep in mind I've forgotten more about cars than you'll ever know.

[Dboyizmlg]

OK this thread bashing has gone far enough now.

OP you brought this on to your self, but just leave this as is.
The more you post the worse you make it for your self.

This thread should be locked ASAP.

[hobbs]

First of all, Hobbs and def and rally whatever the fuck.. You guys are fucking idiots. Period.

And to reiterate my reason for posting..this car was running oem sr20de pistons. I can't seem to get that across, OEM DE 9.5:1 Pistons!


Can't believe I missed his reply, I just imaging this guy in his mothers basement, foaming at the mouth with rage and trying to cobble together some sort of reply as to how he was the first to do this, plus some how proving he was still using stock injectors with 91oct. :rofl:

Yeah, every SR20DE has OEM 9.5:1 CR pistons which is just the same thing as your SR20DET block with OEM DE pistons. Good job!

[S14DB]

OK this thread bashing has gone far enough now.

OP you brought this on to your self, but just leave this as is.
The more you post the worse you make it for your self.

This thread should be locked ASAP.

:stupid::lockd: