Thread: Questions about GT2871R Turbine Housings and A/R..

Not quite like this my friend...

In deed a bigger turbine housing will help him A LOT all the medium frame gt turbos(garrett) have a tremendous responce even at low boost they performe equal of better than the stock turbos example t28 from a gti-r
I have own t28 gt28 gt3071 etc I can tell you for fact that even with the 0.86 he is going to spin the tyres badly
I would do a t3 housing for this types of turbos the t2 are not well matched
the 0.63 will have a very similar respoce if not better than the 0.86 and a lot better top end.
2871 with trim 54 like Andreas said or with a t3 housing
the 3071 0.86 WILL have boost creep if you do a 3 DP I recomend this turbo with external wg.
my 2 cents.

I have read this elsewhere and was wondering what the logic was. From my guess because the T3 housing is bigger it that actually helps although it has a smaller A/R?

and I here I thought the GT28RS spooled fast!

hmmm, the car will basically be a DD, so maybe the larger A/R will be better so the spool is a little higher in the power band.

didnt quite understand quite what you where trying to say there

but here is what i mean

if you want a gt2871r get it in a t2 .64, if you want more a t3 .64 gt3071r and ex gate is a better option than the .86 t2 gt2871r.

i didnt mention earlier that i dont like the gt3071r in the t2 flange and internal gate, but yeah i dont

the gt2871r with the .86 is not a nice turbo imo, but i am sure others will tell you otherwise

I found that the .86 GT2871R makes 25-30 more WHP than the .64 unit. If an xtra 200-300 RPMs is alot of lag then I dont know what to say. This turbo is like having a supercharger on your car spools fast with alot of torque. Serbans friend Robert has the .86 AR on his sentra making 380 WHP at 17 PSI, not bad and spools fast to.


The turbo that sucks is the GT2876R also known as the GT2840R (HKS). This turbo sucks as there is a complete mismatch in wheels. I ran one of these turbos and it did make great HP but up on the top side had boost creep.

^^^ yeah i suppose it does come down to what you are willing to sacrifice, i myself do consider 300rpm laggy for an extra 25whp. However others like yourself wont.

and yes i do agree with you that the 2876r is a pos, big mismatch in wheels. the .86 2871r would be better. However if i lived in the u.s. right now with aus's exchange rate i wouldn't even get a garret, i would be getting one of these: www.billetturbochargers.com | About_Billet.ews

either the billet s gt3 52 trim or the billet s56 gt3 as it run the same extended tip compressor as the borg warner s256 but with a better ball bearing core. However both these turbo's are bigger a fair bit bigger than the gt2871r. However one thing i know billet have sjust done is put their tradmarked core into mitsi and trust turbo's. So a ball bearing td05 18g or td06l2 would be pretty dam hot.

i so wish i lived somewhere that i could take advantage of our crappy exchange rate right now as i would be rocking one of these. But at up to $800 more for a garret unit its just too much. BVut for you boys in the states it would be comparable price wise.

I agree with you ca18 bluebird.. Any garrett from a 2871 up will need a t3 based turbine housing
Regarding to the spoolup in a fwd car the game its diff you need some lag not boost threshold , the transient responce from the 0.64 to a 0.86 its a night day diff but 200-300 rpm of boost threshold its not that much .
Cheers

So give us your opinion as to why a 2871 needs a T3 Turbine housing and not a GT28RS AKA Disco Potatoe.

jpsr20det

Why will a 2871 need a T3 housing?

From my experience going from a 28rs( 0.86) to a 2871 t3 based in a (agu motor) give us almost the same spoolup and the transient responce was identical (pretty much equal) I think the t3 turbine housing will work great also in a 28rs ( they share the same turbine wheel) but the big diff its the comp , for a 71mm the t3 housing its better matched.