So..I put OEM SR20DE 9.5:1 pistons in my SR20DET... - Page 2 - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

kovert240sx · 04-26-2014, 03:08 AM

Quote:

Originally Posted by 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!

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.

zerodameaon · 04-26-2014, 03:16 AM

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 · 04-26-2014, 03:29 AM

Quote:

Originally Posted by 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 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 · 04-26-2014, 03:39 AM

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 · 04-26-2014, 03:49 AM

Quote:

Originally Posted by 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.

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 · 04-26-2014, 08:42 AM

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 · 04-26-2014, 09:00 AM

uploadfromtaptalk1398524396674.jpg

Enviado desde mi U9200 usando Tapatalk 2

Def · 04-26-2014, 08:30 PM

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 · 04-26-2014, 09:10 PM

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 · 04-30-2014, 08:13 AM

Quote:

Originally Posted by kovert240sx

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.

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*** · 04-30-2014, 08:10 PM

Quote:

Originally Posted by 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.

04-26-2014, 08:42 AM	#36
5280VertDET Nissanaholic! Join Date: Aug 2013 Location: Denver Age: 37 Posts: 2,052 Trader Rating: (14) Feedback Score: 14 reviews	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. __________________ S13 Vert \| SR \| PE1420 \| 5-Speed \| 15x9.5 - 0 \|

04-26-2014, 08:30 PM	#38
Def Post Whore! Join Date: Apr 2004 Location: Houston, TX Posts: 2,701 Trader Rating: (16) Feedback Score: 16 reviews	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. __________________ S13 Hatch - Goes around tracks quickly DEFSPORT

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04-26-2014, 09:00 AM	#37
cespana Leaky Injector Join Date: Feb 2014 Location: Guatemala Age: 32 Posts: 116 Trader Rating: (0) Feedback Score: 0 reviews	uploadfromtaptalk1398524396674.jpg Enviado desde mi U9200 usando Tapatalk 2

04-26-2014, 09:10 PM	#39
Dboyizmlg Nissanaholic! Join Date: Aug 2011 Location: SoCal (I.E.), San Berdino, Colton, Redlands Posts: 1,665 Trader Rating: (17) Feedback Score: 17 reviews	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.