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View Full Version : Deep question about 2 turbos


tloh
09-09-2013, 12:53 PM
Ok, I have 2 turbos right now. I had the gt2871r on the car with 750cc injectors. I also have a t28 from a gtir (.86hotside) with 550cc injectors. I was thinking about selling the gt2871r and going t28.

I autox twice a month mostly, i use the car as a daily most of the time, and i would like around 300-350whp. I hate the spool time with the gt2871r and miss the accel my 16g dsm had, even though it died at higher rpms.

My question is, is there a way to run a t28 on 750cc injectors and get around 340whp and still have top end ? i know the 16g would die at 5700-6300ish in power. I want 0-80mph times, as i autox and the only drag i do is 1/8th mile. I loved the feel of accel the 16g had in the dsm and miss that with the lag the gt2871r has. is there a way to increase the spool by alot without going smaller hotside ? the g2871r is 86 as well. i love the power the gt28 makes but the lag and wait time for the power is really boring for a daily and autox car.

mr_eh
09-09-2013, 12:59 PM
Ok, I have 2 turbos right now. I had the gt2871r on the car with 750cc injectors. I also have a t28 from a gtir (.86hotside) with 550cc injectors. I was thinking about selling the gt2871r and going t28.

I autox twice a month mostly, i use the car as a daily most of the time, and i would like around 300-350whp. I hate the spool time with the gt2871r and miss the accel my 16g dsm had, even though it died at higher rpms.

My question is, is there a way to run a t28 on 750cc injectors and get around 340whp and still have top end ? i know the 16g would die at 5700-6300ish in power. I want 0-80mph times, as i autox and the only drag i do is 1/8th mile. I loved the feel of accel the 16g had in the dsm and miss that with the lag the gt2871r has. is there a way to increase the spool by alot without going smaller hotside ? the g2871r is 86 as well. i love the power the gt28 makes but the lag and wait time for the power is really boring for a daily and autox car.

have you considered a twin scroll setup?

tloh
09-09-2013, 01:13 PM
have you considered a twin scroll setup?

I have, but right now I need to either sale the gt2871 and get something else or keep it and try to make it spool faster than 4200 at full boost.

EsChassisLove
09-09-2013, 01:14 PM
T28 won't get 340whp. 300whp MAX and the TQ curve will be shit.

With my 2871 set up at 1 bar 307whp, a nice flat TQ curve making 250wtq at 3500rpm, raising to 280wtq and staying flat until redline, Ianage to be trapping 87mph in the 1/8th with 2.6 60fts and 9.5 ETs hahaha. Traction issues.


It doesn't take much power in these to get into the 8s and 80+mph traps in the 1/8th.

tloh
09-14-2013, 11:31 AM
yea i think i'm stay with gt28 and get smaller/shorter piping and log instead of tube manifold and see how good it spools then. cause right now i'm at 18psi at 4300 if not later. :/:picardfp:

jr_ss
09-14-2013, 12:23 PM
What hotside do you have on your 2871r?

EsChassisLove
09-14-2013, 01:19 PM
My GTX3076 makes 20psi at 4200 haha

EsChassisLove
09-14-2013, 01:19 PM
With a .82 AR also.

ultimateirving
09-14-2013, 02:21 PM
yea i think i'm stay with gt28 and get smaller/shorter piping and log instead of tube manifold and see how good it spools then. cause right now i'm at 18psi at 4300 if not later. :/:picardfp:

Hey i have a log manifold with the 2871r .86 and im about the same as far as spool. 19psi by 43-4500 rpm... Need dyno log for exact but you get the gist..

You could try going to a .64 hotside for faster spool. If that still doesnt please you, i would look to see if there are any divided housings available and go twinscroll manifold.

EsChassisLove
09-14-2013, 02:25 PM
Lol what are you guys doing wrong

ultimateirving
09-14-2013, 02:34 PM
Lol what are you guys doing wrong

rom tune, log mani, .86 , stock cams..

U probably have a bad ass manifold and its a gtx...
oh and smaller hotside.

EsChassisLove
09-14-2013, 08:06 PM
Yea true haha.

Z28ricer
09-14-2013, 08:35 PM
The GTiR turbo will do 340, if you upgrade to a 62T compressor wheel (discopotato) and comp housing, as it sits its rated for 33lb/min, of course you'll still have a setup that doesn't do exactly what you want, you need to buy a .64 housing for the 2871R, and preferribly put it on a stock manifold modified for an external wastegate.

Mikester
09-16-2013, 09:10 AM
If auto-x & 1/8mi are your thing, stick to the T28 & 750's; and maybe add some Poncams and a good EBC if you don't already have one. You can make a nice little profit selling the 2871 & 550's and get the fun-factor it sounds like you're looking for.