Thread: 16VE + T....Realistic Questions

True, inflation is crazy. I bought my turbo brand new from ATP a few years back for just over 1100, and the 2871r was cheap back then.

I guess ebay knockoff would be the only one around 700 haha.

ANdreas is spot on with the whole thing.


If you runa t25 or such, it wil be running out of puff by say 6,000rp, this is where the 16ve comes alive. So yoru literally going ot have nothing in top end.

Get yourself a hold of some comrpessor maps, and do some calcs. I found that at a pressure ratio of 2.2, ie 14psi at the manifold, the engine efficiency curve would go right through the centre of the t2871 efficiency map.

The 2871 will hold power right through without taking the turbo the the extremes of wheels speeds and creating reversion. Its the perfect turbo for the job, any smaller and you wouldnt want to be aiming over 270hp (t28R[aka s15 turbo etc]).

For my setup, for the time being i will be sticking with the T28R, as its financially suitable, and will suit my power need for the street. It also gives me a good base to work off as its my first FWD turbo conversion, and i wouldnt mind getting the whole 16VET thing ironed out perfectly. I also have a feeling i might blow the 16VE, and with my spare 2ltr block it would be pointless buying a 2871 if i ever upgraded to a 2ltr displacement.


heres some good reading:
TurboByGarrett.com - Turbo Tech103

600 us t3/t04e trim 50 will do the job more than fine .

this is the turbo i would run if on a budget. Has a very good compressor map. similar to that of a 71r wheel with a turbine wheel big enough to flow the over lap of 16ve cams.

i wouldn't run a gt2871r the turbine is just too small. i dont see much benifit of this turbo over a gtir turbo tbh.

Well there is 100 WHP benefit from a GTIR to GT2871R.

The GT2871R 9 blade turbine wheel is miles ahead of the GTIR 10 blade turbine wheel as far as technlogy and aerodynamics. Its not the size of the wheel but its flow potential.

what size turbine housing on the 2871 then? .86 will be best im thinking? will be laggy but imagine it once it gets going

The T-2871r is not laggy at all. This turbo comes on very damn hard. It amazes me how kickass this turbo is.

where do you guys get that .86 is laggy from.

When you drive a car with a GT28RS and or GT2871R with a .86 then come and tell me how laggy it is. These turbos are very responsive.

most of that 100whp is in the compressors ability to handle much higher boost. with standard 16ve internals i dont see the guy running 20+psi. I do agree there is a little benefit but not that much considering the whole set up, specially since the 2871r is 3 times the price.

Please go look up NS-111 Turbine wheel and see what it is all about.

The flow potential of the NS-111 wheel is is about 420 WHP Internal Wastegate

The flow potential of the 10 blade GTIR wheel is about 320 Internal Wastegate

Please note I said Turbine wheel. If you put a bigger compressor wheel on a GTIR it will turn into a crap.

At any given PSI the GT2871R will out power the GTIR turbo. I bet at 12 PSI the GT2871R will make 40-50 more WHP and have a much wider power band and hold the power longer which is needed for a high reving SR16VE.

So given that he is nit going to run more than 10-12 PSI of boost the GT2871R can do it more efficently and have less backpresure because of the way better turbine wheel.


Also people dont throw around numbers like a .86 will be laggy.


Questions for people here.

Which is more laggy from most to less.

.64 AR T25 Turbine housing
.86 AR T25 Turbine housing
.63 AR T3 Turbine housing
.82 AR T3 Turbine housing