GT3071r ??? S13

[jc0526]

just picked up my motor set and one it is in and running I will be looking to upgrade of course. motor is late s14 car is early 89 hatch. I am mostly curious as to if the garret gt3071 will have any clearance issues with the factory exhaust manifold. Also I am missing a few things from the motor such as the complete in take plastic. I have the mass ecu ignitor but that is it. also, what sort of wireing issues am i going to run in to?

thanksjeff

[240_SeX]

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[supreamS14]

Unless you are fully bilding the head up you will have sooo much turbo lag it wont be worth it ! If its mostly stock you shouldent be thinking about anything bigger than a gt2871r 64 A/R ! My gt28r s15 speck r dual bb turbo starts making boost @ 1500 rpm and holds 20psi from 4000 rpm to redline !!!

[Neil]

The 3071 isn't TERRIBLY laggy. You always trade response for power but as far as 450hp turbos go its not bad. Reportedly the bottom mount version starts spooling at 1800rpm and hits max boost by 4000, but it's MEANT for 450+hp, so you'd better have the motor to handle it or its just wasted money and less streetability for a sub 300hp setup. It's also requires a little more home engineering to install.

The S15 Spec-R GT28R is very responsive and plenty of people have made 300hp at 18psi with basic mods but 18-20psi is pushing the limit of its efficiency range. That's why a lot of people go with the 2871, because it can make the same power (and on up to 380hp) a lot safer with only a slight impact on response, and Garrett offers a variant which is externally identical to the Spec-R turbo for the same relative ease of install.

just remember that for anything over 12psi or 250whp-ish you need to be thinking about getting a different maf, injectors and a decent tune.


Modified by Neil at 3:19 AM 3/26/2008

[jc0526]

well, my understanding is that the 3071 is just as spooly as the 2871 but makes more power. its like a newer better design or something. Besides I already have a lower powered car that has ridiculous boost response, imagine 18psi by 2400 rpm. I understand everything needed for the horsepower I am going for. I plan on cams, fmic, standalone engine management and I already have os giken twinplate clutch, wideband, will probably use nistune,not sure of the fmic i will use(open to suggestions). My goal is 350 whp on a low boost setting such as 15psi and a hp goal at anything over 400whp. once I reach 400whp I will be rebuilding another longblock as this will be on stock motor. Also would be open to suggestions to cam specs. Will be looking into one piece driveshaft.

Anyway, question is "Will it Fit". I can deal with making exhaust or re-routing intake or boost pipe, as long as it will fit with out any clearance issues.

thanks for the help.

[Geno750]

well, my understanding is that the 3071 is just as spooly as the 2871 but makes more power. its like a newer better design or something. Besides I already have a lower powered car that has ridiculous boost response, imagine 18psi by 2400 rpm. I understand everything needed for the horsepower I am going for. I plan on cams, fmic, standalone engine management and I already have os giken twinplate clutch, wideband, will probably use nistune,not sure of the fmic i will use(open to suggestions). My goal is 350 whp on a low boost setting such as 15psi and a hp goal at anything over 400whp. once I reach 400whp I will be rebuilding another longblock as this will be on stock motor. Also would be open to suggestions to cam specs. Will be looking into one piece driveshaft.

Anyway, question is "Will it Fit". I can deal with making exhaust or re-routing intake or boost pipe, as long as it will fit with out any clearance issues.

thanks for the help.

The setup your thinking of is the Full-Race twin scroll mani with the twin scroll 3071r. Yes, that setup was making more power and boosting sooner than the t2 flanged gt2871r, not to mention it had a larger housing than the 2871. However, you mentioned stock manifold, so in your case, no, your wrong. the bottom mount, t2 flanged 3071 would be like someone else already said, laggy.

As for intercooler, the pbm intercooler and the greddy ls spec are ideal for your power range, and are the exact same thing (cores are made at the same factory). The only difference is the greddy's pipes look better, but you'll have to buy a hotpipe. The pbm kit has slightly worse pipes, but includes a hotpipe, but you'll have to buy the silicon hoses to connect it to the tb and turbo outlet.

[supreamS14]

I LOVE my set up! as soon as I touch the throttle it has instant throttle response , the front lifts and loads the rear then Im off in a blink of the eye! You want ALL your parts to work together! The closer they are to the max efficiency range the better the response and efficiency! Like I said for the stock exhaust mani., gt2871r with 64 a/r is your best bet!

[jc0526]

well i am looking for 415rwhp and i dont belive the 2871 will do that for me. maybe looking in to a tubular manifold. anybody have any idea of which may be the best for the money, then should I be looking for top bor bottom mount?

thanks

[supreamS14]

Codyace Hit 400whp on a 2871r 64 a/r with the stock exhaust manifold All he had to do was smooth out the inner exhaust castings on the mani and turbo and it spools faster than the 86 a/r and the disco P so I could picture you hitting 415 whp with a tubular mani ! The 2871r 86 a/r is rated @ 475 whp and spools just a lil slower. I found out today that My gt28r hits 20psi sooner @ 3000 rpm on stock exhaust mani in 3rd 4th and 5th

[jc0526]

well, my initial goal is 415whp. once my stocker motor pops I will be opting for internals cams port work. i will be trying for closer to 500whp so i would rather not have to buy a differant turbo later. I would rather just get the one i will need as i believe the 3071 better suites these needs. and i was initialy looking at the 2871. were can i find a good alum driveshaft

[supreamS14]

Yep my initial goal was 450whp on the stock bottom end but Im poor so Thats not gona happen for me anytime soon ! I got mine from shaftmasters for $315

[inkslingers13]

t3/t4... its a good turbo 50 trim .48ar

[ryan15]

Yea t3/t4 50 trim .63 exhaust side would be a great turbo for your needs 450+whp on pump gas, and in upper gears you will be lookign at full boost in the lower 3k rpms.

Ryan

[DrifterProdigy85]

Since your talking GT3071R-WG, the Housing with the 3" Compressor Inlet will fit but the 4" Inlet housing will hit the engine mount bracket from what ive heard.

[srdub-t]

i will be trying for closer to 500whp so i would rather not have to buy a differant turbo later. I would rather just get the one i will need as i believe the 3071 better suites these needs.

. Then dont go t2 flange buy a good manifold and get the t3 gt3071r and youll love it. Thats what im running. Gt3071r t2 is kinda worthless

[compactfean]

Weird? ! I have a gt3071r t2 64ar on my car right now! And yes it does fit with stock manifold! The compressor housing is less then half a fingernail from the motormount. The only problem is when I have my boost contol set at 10 lbs it sometimes spikes to15, worst case ive seen it spiked to 23. Sites the 3071 is badars! I agree with the other fella though....t3 is the way to go. I'm switching to t3 so I can contol boost a little better and go fullrace twin scroll and external eg.

[compactfean]

Oops waste gate

[nissan_star]

try to get a twinscroll manifold if you don't want to stock mani.

[idahotuner]

you should look at mazworx turbo kit. its a gt3076r single scroll. .63 a/r but makes power just as fast the full race kit.