Redtop SR20 + GT2871r question

[Mr.Y]

Alright here's my situation. I'm nearing completetion of my redtop build and I came across and issue that slipped my mind in the beginning. I have a mildly built redtop with all new oem gaskets, new oem head gasket, new oem studs, milled head, honed block, new JE pistion rings, acl main and thrust bearings, clevite oversized rod bearings, BC valve springs+retainers, supertech valve seals, gt2871r turbo, megan elbow, invidia 3" DP, Apexi N1 3" exhaust, megan header, freddy I/M, FMIC.

I was planning on running stock maf, stock injectors and stock ecu til I could save up for an upgrade but now I'm worried if my setup is too much to run stock maf, inj, ecu.

Can someone with experience chime in and advise on what I should do. Can I get away with getting a nismo fpr and raising the pressure a bit and run richer or just not drive at all til I get the upgraded parts? I need the car on the road asap and very tight on money. Also, the actuator on the turbo is set at like 10 or 11 psi.

I have parts I would trade for injectors, maf or jwt/enthalpy ecu. Plz text at 413-885-2372 or email at [email protected]

Forgot to add. Also have walbro 255 fuel pump, z32 fuel filter, UR crank pulley and isis pulley set.

Thanks in advance!

[nissanfreak317]

if you run that turbo at oem boost levels it shouldnt be a problem.

*Edit* This may require an electronic boost controller with stepper motors. or finding an oem wastegate actuator and somehow making it fit.

Definitely don't try to just raise your fuel pressure and run it at higher boost levels than stock unless you like scraping melted pistons out of your engine.

there is also an entire thread dedicated to the gt2871r turbo on the sr20 engine when you are ready to do it right. good luck.

[fullthrottle]

I think wastegate spring pressure is 14psi on that turbo. Or atleast thats what mine was on the spring. So I couldnt go lower than that which is to much for stock injectors.

[Sileighty_85]

so your gonna run a 2871r with a stock headgasket?

Let me know how that turns out when you run that turbo at full boost

Just keep the stock turbo on until you are 1 week away from a tune, Its not hard to swap out a turbo

[Mr.Y]

Thanks for the quick replies. I appreciate it.

I know it sounds dumb runnin stock hg with a turbo like that but I don't plan on running full boost. 15-16psi max. My budget is quite limited and at the time it was a cost issue so I went with stock. I did a pretty in-depth search on the matter and from what I read it sounds like the hg will hold fine. Its all a matter of good level mating surfaces and proper torque. That's why I had the head and block machined and a real tech assemble my motor per fsm.

Also, could it be that I have an adjustable actuator cuz its made of 2 parts, a threaded piece, a receptacle and a nut. If so, how do I adjust it to lower the psi and how do I measure what rated spring I have. Thanks

[Mr.Y]

Don't have the stock turbo :-/

[HPballer76]

you could pic up a stock t25 for the price of an adjustable fpr.

[Mr.Y]

Maybe so but I'd rather pick up a fpr. So technically I could run my setupbut only if the boost is at stock level give or a take a pound correct? Could I get a 7lb spring for the actuator or those are sealed for good?

Can someone comment on the earlier post about the actuator being adjustable? If so how can I set it to lowest possible boost? Thanks

[greenman100]

Unhook the actuator arm. You shouldn't boost over 7psi, though I'd keep an eye on it.

[!Zar!]

Don't run it.

Don't do it.

Simple enough?

[renegade_ewok]

Thanks for the quick replies. I appreciate it.

I know it sounds dumb runnin stock hg with a turbo like that but I don't plan on running full boost. 15-16psi max.
You won't be running over 10 psi on stock headgasket.

I think your gonna put the car on the dyno and pull #3... milkshake. Get an Apexi.

[stealthsr20]

I love milkshake!

[Mr.Y]

Strawberry milshake from Mcdonalds Rock! :-)

I think I got my situation under control. Just picked up some new DW 660 injectors, z32 maf and tuned enthalpy ecu for 300. Talk about highway robbery :-D

[cotbu]

so your gonna run a 2871r with a stock headgasket?

Let me know how that turns out when you run that turbo at full boost

Just keep the stock turbo on until you are 1 week away from a tune, Its not hard to swap out a turbo

You see what reiterating mindless bullshit causes!
You won't be running over 10 psi on stock headgasket.

I think your gonna put the car on the dyno and pull #3... milkshake. Get an Apexi.
Again boost alone does not blow fucking head gaskets, just stop saying that shit!

F that magazine article that started it all, or that shop that recommended an additional six hour job to install an SR into an S-chassis.

OP know that you think you have it under control, make sure your tune and injectors are what you paid for, also known as have your injectors flowed and tune dumped, unless you purchased it from a reputable source.
A bad tune and f'ed up injectors can blow your shit at idle! :rimshot:

[2fast4y0u]

getting an adjustable fpr isnt gonna help, its gonna make u be able to run higher boost on the stock head gasket and thats not good.
dont run it...hands down dont do it.
if u are on a tight budget now, wait till you blow that head gasket and cant afford to fix it.

IF YOU CAN NOT AFFORD TO DO IT RIGHT, DONT DO IT!!!!!!

[JonGu]

Unhook the actuator arm. You shouldn't boost over 7psi, though I'd keep an eye on it.

This is not true, unbolting the actuator arm would allow the flapper to move freely and you wouldn't build boost at all because the flapper would always be open.

[Mr.Y]

Cotbu I like you're thinking. The injectors are brand new deatschwerks but if I were to get them flowed where could I do that? I also plan on gettin in touch with enthalpy to have them tell me exacrly what the ecu was tuned for and prolly just send it in and get reflashed for my setup just for peace of mind.

Moving on. 2fast4y0u I wasn't planning on boosting over stock psi til after I got inj, maf, tune which I already purchased so that topic is closed. I also spoke to a guy few days ago that ran stock hg on an sr for 2 years with 15-18 psi ZERO problems so that goes to say that it is possible, everything just needs to be done right.

I will keep everyone posted on how things go. If I do end up blowing the hg for who knows what reason, I will go with apexi. Only reason I couldn't do it then was cuz I was buying a bunch of shit every week cuz I need the car on the road asap and gettin complete oem gasket kit with studs for under 200 made more sense than droppin 200 on a hg alone.

Keep in mind everyone that this is going to be a DD. It will prolly never see the track, maybe couple 1/4 runs and some fun on the streets. I'm not the kinda guy to go balls out every chance I get. Just wanted to build a fun DD with some kick to the nuts :-D

[2fast4y0u]

if ur not planning on boosting over stock psi then dont get the adustable fpr now.
i have a very slightly used Cometic 1.01 head gasket i will sell you for cheaper then a fpr :)
that will get you on your way faster

[Mr.Y]

Heard bad reviews on that hg and the motor is all put together, just waitin on flywheel. I would hate to tear it all apart again. Like I said before I need it on the road asap. Thanks for the offer tho, if anything changes ill drop you a pm.

[2fast4y0u]

im not being an ass when i say this...please point me in the direction of bad reviews on that HG. like i said, im not being an ass, i just would like to know what mine might do.

[handinpants]

Unhook the actuator arm. You shouldn't boost over 7psi, though I'd keep an eye on it.

Don't listen to this dood, he's higher than towlie, dude get a different head gasket, unless you have extra money to spend later down theroad when the stockon goes out, and as foryour turbo situation, I wouldn't go upgrading turbos til yougot your fueling taken care of. Nistune is good inexpensive tuning. Jim wolf is a waste of money though.

[Mr.Y]

Strawberry milshake from Mcdonalds Rock! :-)

I think I got my situation under control. Just picked up some new DW 660 injectors, z32 maf and tuned enthalpy ecu for 300. Talk about highway robbery :-D


As stated previously, the fueling is take care of. I will keep the stock hg and let everyone know how it turns out. Than we will debunk the myth whether or not stock hg can hold 15 psi reliably having done everything the right way. And if it blows than so be it. Ill bring it back to my uncle and he'll take care of me for cheaper than you can imagine.

As for 2fast4y0u, I read on one of the forums that this guy used the cometic and when he went to tune it blew at 18psi. I'm not gonna jump the gun and say that cometic suck cuz it could have been a shitty assembly job, head or block uneven etc.

[JonGu]

I've had Deatschwerks flow test and clean injectors their brand injectors for me before. Give them a call, turn around was quick at the time.

[inopsey]

You won't be running over 10 psi on stock headgasket.

I think your gonna put the car on the dyno and pull #3... milkshake. Get an Apexi.

you honestly think that the oem headgasket is that under engeineered compared to the rest of the engine? has anyone saying the stock head gasket is shit actually ran it on an upgraded turbo before? or is everyone going on hearsay?

this is a tuner in australia running a 3071r on 24 psi totally stock engine
POWERTUNE RED DRAGON - Hardtuned.net (http://www.nissansilvia.com/forums/index.php?showtopic=382765) including headgasket.

[cotbu]

WitchHunter Performance
cruzinperformance
Deatschwerks
There's more, search google for injector servicing
Picking the closest one to you, doesn't always mean quick turnaround.

[Sileighty_85]

You see what reiterating mindless bullshit causes!

Again boost alone does not blow fucking head gaskets, just stop saying that shit!

F that magazine article that started it all, or that shop that recommended an additional six hour job to install an SR into an S-chassis.

OP know that you think you have it under control, make sure your tune and injectors are what you paid for, also known as have your injectors flowed and tune dumped, unless you purchased it from a reputable source.
A bad tune and f'ed up injectors can blow your shit at idle! :rimshot:


Whoa there Mr Know it all, you need to chill the fuck out, Im very aware that "Boost Alone" does not
Seeing that ever turbo flows a different CFM

But notice I was specifying the 2871R so if you run THAT turbo at 21psi it will blow the stock H/G

Ive seen SRs blow Stock H/G over 14psi with T28's

yes a tune will make or break an engine...blah blah blah, but Ive yet to see anyone making 400hp on a stock H/G

[2fast4y0u]

As stated previously, the fueling is take care of. I will keep the stock hg and let everyone know how it turns out. Than we will debunk the myth whether or not stock hg can hold 15 psi reliably having done everything the right way. And if it blows than so be it. Ill bring it back to my uncle and he'll take care of me for cheaper than you can imagine.

As for 2fast4y0u, I read on one of the forums that this guy used the cometic and when he went to tune it blew at 18psi. I'm not gonna jump the gun and say that cometic suck cuz it could have been a shitty assembly job, head or block uneven etc.

after you said that i did some searching and found quite a few post on other forums saying that people where having issues. after reading a lot of the post, it seems to be more user error then anything else. people not decking the head and block, saying " oh well theres big scratches, metal HG will bond to it" NOPE!, etc...
also, the wrong bore size seems to be an issue with people...

i dont think there is much difference between a lot of the after market parts these days, but that is topic for another thread, and certainly not by thread jacking your post.

please let is know how it turns out

[cotbu]

Whoa there Mr Know it all, you need to chill the fuck out, Im very aware that "Boost Alone" does not
Seeing that ever turbo flows a different CFM

But notice I was specifying the 2871R so if you run THAT turbo at 21psi it will blow the stock H/G

Ive seen SRs blow Stock H/G over 14psi with T28's

yes a tune will make or break an engine...blah blah blah, but Ive yet to see anyone making 400hp on a stock H/G

I will say it again, boost doesn't blow head-gaskets period! Thanks for at least getting that. Now! I know my shit! As for 21psi and 400hp on a stock head gasket, I'm not there yet but I do have 350hp (gt2871r 56trim t04e cover) with a stock head gasket with at least 10years on it and I've beat the hell out of the car for 6years never replaced the head gasket, know that I said that it just might blow! I've seen many head gaskets blow as well, some were NA explain that to the masses would you! Don't forget to mention how much boost they were running!

And what the hell is full boost on a gt2871r?
If he is running 21psi and not tuned for it yes it will blow his engine, not necessarily his head gasket

[Sileighty_85]

I will say it again, boost doesn't blow head-gaskets period! Thanks for at least getting that. Now! I know my shit! As for 21psi and 400hp on a stock head gasket, I'm not there yet but I do have 350hp (gt2871r 56trim t04e cover) with a stock head gasket with at least 10years on it and I've beat the hell out of the car for 6years never replaced the head gasket, know that I said that it just might blow!

If that is true then your the first person that Ive heard of making that much power on a stock H/G


I've seen many head gaskets blow as well, some were NA explain that to the masses would you! Don't forget to mention how much boost they were running!

Its called overheating or pre-detonation same thing happens on turbo'd engines

And what the hell is full boost on a gt2871r?
If he is running 21psi and not tuned for it yes it will blow his engine, not necessarily his head gasket

21 psi is what ive been boosting on mine for almost 2 years.

Duh, that just happend to a kid over here, got stupid and hit 18psi and smashed a rod bearing.

[Mr.Y]

Alright so what you think guys, what kinda numbers can I expect from my setup?

[greenman100]

This is not true, unbolting the actuator arm would allow the flapper to move freely and you wouldn't build boost at all because the flapper would always be open.

That's the point.

And for the record, you would build boost. The internal W/G is a choke point - some flow would still pass through the turbine.

Its cool, I only have a PhD in Mechanical engineering, while most of Zilvia hasn't taken a class in physics.

Sigh.

[2fast4y0u]

That's the point.

And for the record, you would build boost. The internal W/G is a choke point - some flow would still pass through the turbine.

Its cool, I only have a PhD in Mechanical engineering, while most of Zilvia hasn't taken a class in physics.

Sigh.

phd huh? i have one of those. Player Hating Degree. :wiggle:
god that was so 1999

[bl3ujay07]

Alright so what you think guys, what kinda numbers can I expect from my setup?

I would say, from your setup right now, a blown motor when the turbo spikes. :rl::rl::rl::rl:

[JonGu]

That's the point.

And for the record, you would build boost. The internal W/G is a choke point - some flow would still pass through the turbine.

Its cool, I only have a PhD in Mechanical engineering, while most of Zilvia hasn't taken a class in physics.

Sigh.

"Sigh"

Where did you get your degree at? An online college? You're recommending his method for boost control is to unhook the wastegate. That's a really good idea buddy. Somehow you think this is a safe method and that it will build 7-8 psi? Good god you must be one of those guys with a PhD and still works at Walmart.

Maybe if this was on a larger displacement motor it would build boost but on a 2 liter low compression motor there's no way it's going to make 7-8 psi with the flapper wide open.

Oh yea, I've taken university physics 2. It's apart of the degree program to be a geologist.

[DeatschWerks]

If I was to make a guess, I'd say in the 260whp-290whp range.

My roommate put down around 220whp (DynoJet, I believe) on his stock T25 with intake and 3" exhaust running 12psi.

If you have a question about your injectors, you could send them in for flow testing. Our turn around time is quick, 1-2 days.

Feel free to PM me or shoot me an email. I'm on Zilvia everyday.

[kassed33]

I have a black top with stock HG, all stock internals and the same turbo, Z32 maf, tuned ecu, 550cc inj. And I'm running 25psi high boost on C16 fuel. With 365whp for 6yrs now no prob. So it can be done.

[greenman100]

"Sigh"

Where did you get your degree at? An online college? You're recommending his method for boost control is to unhook the wastegate. That's a really good idea buddy. Somehow you think this is a safe method and that it will build 7-8 psi? Good god you must be one of those guys with a PhD and still works at Walmart.

Maybe if this was on a larger displacement motor it would build boost but on a 2 liter low compression motor there's no way it's going to make 7-8 psi with the flapper wide open.

Oh yea, I've taken university physics 2. It's apart of the degree program to be a geologist.

Good lord, can you read? I didn't say he would make 7psi, I said he wouldn't make more than that - meaning i'd expect a couple psi of boost at the most, maybe a spike to 5 or 6.

It depends a lot on his exhaust setup. Have you ever run with the wastegate unhooked?

Please, tell me what about it would be unsafe?

[dsmvsep3]

I'm running 2871r on my redtop at 7 psi right Now stock injectors regulator ecu and my afr is 11 till redline. You'll be fine just make sure you port that wastgate "tunnel" ....... Boost creep sucks o yea thread revival

[xxoreolovexx]

Ive been running a gt2871r .86 on 16lbs on an oem HG for a year now with no problems. but i have 550cc injectors, n62 maf, and 248/264 cams. with an enthalpy tune ive been good. ive pushed the boost to 23lbs with no issues

[SR20FTW]

If you have a new OEM head gasket, with good head studs (ARP) is what I run, you can run a GT28 all day with alot of boost.

[Nismo180]

Sup 50k miles on my SR first ~15k were with T25 doing the whole 15psi to 12 at redline thing and then the last 35k have been on a GT2871R with JWT ecu bigger injectors blah blah blah STOCK headgasket the whole time, stock headstuds stock damn near everything inside this impressive little motor. I got a healthy motor and it's been tuned properly the whole time. I've had it set at 18psi since the day the clutch was broken in no issues, no hiccups, just boost.

Let's take a moment and use this thread revival to remind ourselves that internet rumors are just rumors and we should all find proof of concept before believing that the strong head gasket designed by the talented engineers at Nissan is going to explode into tiny pieces because we upgraded our turbos.

[Mr.Y]

Hey guys glad to see people chiming in with real life experiences and not rumors like stated earlier. Here's a little update on my build.

Car now has cosworth 1.5 metal gasket due to a very unfortunate mishap on my part and a bent rod. Note to self, don't put coolant line to manifold. Duh! :-/

Anyways got enthalpy ecu, magnafuel fpr and all the parts listed in the begining. Car starts but idling rough and smoking so I cleaned the iacv, new plugs, ordered new coolant temp sensor and gettin new o2 sensor tomorrow. Oh, also adjusted tps to .045v per fsm. So hoping I can get it running good and get it on the road asap. Ill keep everyone posted and try to get some pics up.