Turbo Choices for the SR20DET

Alphat · Post by **Alphat** » Thu Feb 10, 2011 12:27 pm

I'm looking to upgrade the stock turbo on my S14 with the SR20DET Blacktop VVT engine.

I'm aiming for +/- 260kW at the flywheel (currently have 220kW). I want to minimise turbo lag and have the lowest boost threshold possible. The car is mainly for street use an occasional track days.

Would like the Garrett GT2860RS or GT2871 but these are prohibitively expensive so I have been looking at the following:

- T28/T3: Turbine 0.64 A/R, Compressor wheel 60-1.

- T3/T04E: Turbine 0.64 A/R, Compressor A/R ???, Compressor Trim ???

Is anyone using these turbos and what are your opinions of them?
Which is the best trim and A/R for the T04E compressor?
Any other recommendations?
Any help would be much appreciated.

aep886 · Post by **aep886** » Fri Feb 11, 2011 6:57 pm

T04E will lag like hell... unless you have lots of work done on your head!!!
T28 BB it the cheapest... but for 260kw... you need lots of money~!
the best Turbine i experience is the HKS GT3037s-pro~ but that even more expansive then the GT2860RS ...
so the conclusion is nothing is cheap!!!

djtreble · Post by **djtreble** » Fri Feb 11, 2011 8:08 pm

I've heard the HKS GT-RS is as quick in spooling as the GT28RS and good for 400BHP, I was recommended it by a mate here in the UK.

Actually just found this link:
http://www.hksusa.com/products/?id=1672

I think I will probably go with that when I go for more than 280BHP (after I stretch all my standard stuff).

POWDER · Post by **POWDER** » Fri Feb 11, 2011 11:35 pm

Well if you want one, I have a T3/T4 with AR.48 ex housing and AR.50 comp housing, Brand new in the box still. R3000 and will spool a crap load quicker than a AR.60. This one should pop in round 3000RPM on an SR20DET, which is what I was planning it for.

PM me if u interested

Efini-Boy · Post by **Efini-Boy** » Sun Feb 13, 2011 11:02 pm

I've got an interesting question, how will the stock turbo from a 13b rotary perform on the sr20det? specs: Hitachi HT18S-2S has an A/R of 1.00.

300sx · Post by **300sx** » Mon Feb 14, 2011 10:45 am

Hitachi HT18S-2S has an A/R of 1.00

rotary turbo's have massive turbine housings, way to big for a sr20

Alphat · Post by **Alphat** » Mon Feb 14, 2011 11:41 am

Thanks for the responses.
Unfortunately the HKS GT-RS and Garrett GT2860RS are out of my budget at the moment.

I have heard good reports on the T3/T04E but very few are firsthand.
Is anyone using a T3/T04E on their SR20DET?
If so, what A/R turbine housing are you using and how is the performance, especially in terms of lag and boost threshold?

Grobblere · Post by **Grobblere** » Mon Feb 14, 2011 3:45 pm

Give Smart Racing in PTA a call, they have a "generic" version of the Gt28RS available for +- R3500-R4000 (non BB i think)

Those T3/T4 turbo's seem to indeed work very well. I have friends who use them, they are good for +- 340-420whp on under +-1.5 Bar boost depending on motor.

Lindt · Post by **Lindt** » Mon Feb 14, 2011 4:28 pm

Efini-Boy wrote:I've got an interesting question, how will the stock turbo from a 13b rotary perform on the sr20det? specs: Hitachi HT18S-2S has an A/R of 1.00.

is that the turbo that worked with that flat to close the one port?

Efini-Boy · Post by **Efini-Boy** » Tue Feb 15, 2011 12:33 am

THat's the sequential turbo setup on the series 6 rx7 you thinking about, they are much smaller, the turbo I mentioned are from the seriies 5 rx7 with the single turbo motor

Efini-Boy · Post by **Efini-Boy** » Tue Feb 15, 2011 2:05 am

I'm thinking of getting one of those upgrade "copy" turbo's aswell, what is the diffenences between the GT2860RS and the Gt28RS?

phoenix s14 · Post by **phoenix s14** » Tue Feb 15, 2011 7:16 am

A word of advise with them copy turbos. Make sure you buy a correctly spec'ed one. These turbos are often just slapped together with which ever housings and wheels are available. My TB28 (T28/T3) I found out is now too small and can only do 0.4 all they through the rev range. Turning up the boost make the boost go up but then tapers back down pretty quick.

Make sure the housings and wheels are at least as follows

Intake: 46.5mm inducer and 60mm exducer (T3 60Trim) with at least a .42AR housing
Exhaust: T28 wheel with a .64AR or .86AR housing.

A friend got a .36 exhaust housing on his and now has alot of boost creep in the longer gears because the turbo does not flow enough.

I got a .86 exhaust housing but only got a 40mm inducer (45trim as far as I know) causing my turbo to run out of puff and over the choke line.

All I am saying is make sure the one you buy can do the job... compare it to the actual specs of the proper one.

Charlvdw · Post by **Charlvdw** » Tue Feb 15, 2011 7:26 am

Mine was rather lekker , i actually found it difficult to keep the boost below a bar. And that was on the CA.

Andrew.200SX · Post by **Andrew.200SX** » Tue Feb 15, 2011 8:31 am

Charlvdw wrote:Mine was rather lekker , i actually found it difficult to keep the boost below a bar. And that was on the CA.

I have it fitted to my SR20DET and @ .9 bar with a stock redtop I have 191 kw's. It is a WR280 Turbo , if you want more.. go with the WR380 !

POWDER · Post by **POWDER** » Tue Feb 15, 2011 8:43 am

How do you check the trim on the blades of the exhaust and compressor housings, does that represent the angle of the blades?