GT2871 .64 trim

[Sil80315]

heres a question I can't seem to find anywhere or if the question is answerd it doesn't seem to make sence.. My only question on this turbo is

What is this turbo's max PSI?Where is this Turbo's Safe PSI area?

Thanks guys

[Fenvy]

your engine will blow before you go out of the turbo's peak effiency, that is the beauty of GT series turbo

I am assuming you're talking about this turbo

http://www.turbobygarrett.com/...1.htm

[DrifterProdigy85]

Efficient from 16psi to 20psi. After that i think its pushing it too much. You can probably get up to 24psi on the .86 A/R. I can tell you for sure the motor wont blow if using the full efficiency of the 2871R. I boost 20psi daily and have done 26psi on race gas and the motor is still strong as ever.

[sssrdub]

thats my next upgrade

[Sil80315]

ah ok sweet. thanks for the info. I have this turbo on my motor now and its only boostin at 10psi and even that is pretty nice feeling. So I would be safe enough to set the boost to 20psi?

Incase you don't know about my set up

550cc injectorsTopspeed intake manifoldHKS 264 camsCometic metal headgasketARP studsMegan exhaust maniProcession GT2871RLE .64 trimZ32 MafRom tuned by Enthalpy

[TchouikoS13]

dude, thats what i was thinking for my future setup, just different mani

[Sil80315]

dude, thats what i was thinking for my future setup, just different mani

Yeah some people bash the megan manifolds but i just can't see myself buying a $800-$1000 manifold. I have no idea how long the manifold is going to last but it has already outlasted my friends manifold which was SSAUTO Crap. Plus the welds on the megan manifold are very nice and looks very stronge. but time will tell. unless your talking about my intake manifold? lol

[ebydrc]

your engine will blow before you go out of the turbo's peak effiency, that is the beauty of GT series turbo

I am assuming you're talking about this turbo

http://www.turbobygarrett.com/...1.htm

what? gt turbos like any other turbo have a eff. range after that its more or less blowing hot air. a gt28r wont hurt at 20psi which is what i would say its top eff. after that you need a different turbo. your not going to blow anything up unless you have a god awful tune

[DrifterProdigy85]

I like my Megan manifold also. You'll want to get 650 or 740cc injectors to run 20psi. Youll also need 93-94 octane gas.

[FSUDrifter]

i run 19 psi

[DrifterProdigy85]

I run 19psi on 93 octane, ive ran 24psi on 102 octane before.

[Sil80315]

Ok so i plan on running at 18 psi daily, but would my injectors hold out if i wanted to do 20 psi? I also only run 93 octan anyway plus i do have a nismo fpr i can install to help out.

[DrifterProdigy85]

I doubt it. There gonna be pretty well maxed out. You can try running around 50psi fuel pressure and lean the AFR out to 11.8 AFR to give some more leway. I think Enthalpy did 400whp on 550 injectors a while back doing this.

[sbanzer123]

stock mani extrude honed and swained.

[Sil80315]

Yeah i know theres probably a few tricks to get more power out of the injectors but all in all if it becomes a huge problem ill just have to upgrade the injectors and retune the ecu.

but i know for sure i want to buy an AEM wideband before i crank up the boost.

[DrifterProdigy85]

Definitly a good idea. I bought my 740cc injectors from Deatschwerks and it came with a flow sheet. Breaks it down into Flow CC and Fuel Pressure. 43.5psi is 740cc while 50psi is 810cc. So you can flow quite a bit more from 550cc if you bump fuel pressure from stock. Definitly flow over 600cc which would be fine for 370whp or so. Just be sure to lean out the AFR since increasing fuel pressure will be forcing more fuel in.

[Sil80315]

Definitly a good idea. I bought my 740cc injectors from Deatschwerks and it came with a flow sheet. Breaks it down into Flow CC and Fuel Pressure. 43.5psi is 740cc while 50psi is 810cc. So you can flow quite a bit more from 550cc if you bump fuel pressure from stock. Definitly flow over 600cc which would be fine for 370whp or so. Just be sure to lean out the AFR since increasing fuel pressure will be forcing more fuel in.

OK but i talked to the guys at enthaply and they told me even if i got a SAFC, i can only do +10/-10 otherwise it would mess up the tune. so i mean how much can i really do with a safc and my nismo fpr, ya know?

[DrifterProdigy85]

Youll be fine. I ran 50psi on 550cc injectors and used the SAFCII to lean 20% across the board at WOT with my Enthalpy Tune. Ran a perfect 11.8 AFR. Youll probably have to lean out the Low Throttle setting about 3-4% as well so its not gonna be really rich on spool up. Just get a Wideband, and start adjusting. A good rule of thumb to stay at is Cruising under vacuum should be around 14.7 AFR. Building boost should be around 12.5-13.0 AFR. WOT under boost should be 11.5-11.8 AFR with 93 octane. Maybe run a little richer with 91 octane.

[HurryupandrunS13]

ah ok sweet. thanks for the info. I have this turbo on my motor now and its only boostin at 10psi and even that is pretty nice feeling. So I would be safe enough to set the boost to 20psi?

Incase you don't know about my set up

550cc injectorsTopspeed intake manifoldHKS 264 camsCometic metal headgasketARP studsMegan exhaust maniProcession GT2871RLE .64 trimZ32 MafRom tuned by Enthalpy

With that set up (especially the enthalpy ROM) 20psi is feasable. All the time on stock internals though, not sure it'll last forever. You've got a wicked set up man. Any dyno #s?

[DrifterProdigy85]

Ive got basically the same setup except using 740cc injectors and .86 A/R 2871R. My dyno stuff is in my sig. 355whp was made with a slipping clutch and a noticable boost leak at the IC. Im gonna be redynoing in the next week or two. Gonna get before and after dyno from HKS 264 cams to BC 264 cams.