juggernaut1

Adrian, Snapped a couple of pics of my bellmouth insert I had turned up - mine is welded in with 4 small welds.

Haha...I've found the exact opposite - twin turbo LS2 car tuned in Sydney on Autotech Engineering dyno then put on Chipmaster dyno in Perth and made 50 hp less in Perth both on Dyno Dymanics dyno.

So whats the all up damage for one of these, Adrian? Also is it possible to buy the turbo minus the ex housing i.e. just the CHRA and comp cover so you can slot it into your existing ex housing - it has the T3 60mm ex wheel right? Cheers

Adrian, If your running around 9.2:1 comp, smallish cams, bigger ex valves and headwork you could probably get away with the .82 ex housing over the .68 without too much pain, if any. I picked the 3076 comp and had a bell mouth turned up and welded into the comp housing ala HKS style.

Your right - accordingly, to my calc's 26psi at 4000 on a SR is off the map for a 3071. Just lucky I found the problem during preparations for its inaugural track day outing. Surge ported 3037 here I come.

Flow maps would be helpfull. What would be the flow difference between a 3071 56trim versus a 3076 52 trim? Would the 3071 with a .82 rear be like an upsized disco potato? I've seen stroker SR's 2.2litre make around 315 rwks with a 3071 and .63 rear. So that may give some idea of what it would do on an RB. I myself made 290rwks with a standard stroke SR with a 3071 .78 twin scroll rear. However compressor surge killed the turbo - it was making 26psi at 4000rpm on the last dyno run it did - more flow than the engine could swallow at those rpm.

This sort of comparison will show trends and shapes of curves btn different setups which is always interesting.

Only relying on memory here...but doesn't the 2876 use a 52 trim 76mm comp wheel/housing - which may be the source of the compressor side of this setup. Late Edit: Actually no, I just checked and the 2876 uses a 48 trim 76mm comp wheel and .70 comp housing - close but no cigar.

I've had inlet and exhaust manifolds and a compressor cover done by SPP. Due to a change in the setup I never used either of these components but I have before and after flow figures for the manifolds. There is no change in clearances with the comp cover - because none of the machined surfaces are touched - only the volute is done. Also SPP doesn't do twin scroll ex housings.

PJ has the same tuner and on the same dyno is making 375rwks on 25psi and 721ft/lb of torque - E85. So very similar results on two different engines with the same tuner and dyno. Although NYTSKY's setup has a much broader power band. In summary 3037/3076 and E85 =

More likey exhaust gas pressure in the turbine housing. Unfortunately, turbine sizing is a trade off between response/spool and hp. PJ is running this turbo on an SR and it is holding 25psi at 7400rpm - but he runs a T25/T28 HKS 1.12 ex housing vs NYTSKY's T3 Garrett .82. I've no doubt there's still more in NYTSKY's setup if boost could be held - you can see the torque curve closely mimics the boost curve. If you can hold boost, torque will pull up and therefore hp at a given rpm. However, this maybe all that can be practically pushed through the .82 ex housing. In any case its an awesome setup for a street car and no doubt more than a handfull for most of us.

Excellent power and torque - would be a responsive rocket no doubt....you got it to hold boost....what was the secret....boost controller?

You may also be missing a collar that bolts onto the t/b over the spindle and houses the arm. I'm relyin on memory here - best to Hypertune or look on their site for some pics.

I have that t/b on my SR and the stock s15 SR sensor just bolted straight on. Do you have the little arm that grub screws onto the t/b spindle as it is not in your pic? Hypertune supplies the little arm with their t/b's. If its missing just give them a call for a new one. As this little arm stikes the paddle on the tps and rotates the tps as the t/b is opened/closed.

The cartridges are rebuildable - I got quoted approx $700 including cryogenically treated bearings from Grant at Per4manz turbochargers for a rebuild of my 3071 which the bearings failed after 6000 klms on the street. You would need a comp wheel on top of that price tho'. Grant mentioned heat is the cause of 90% of bearing failures in the Garretts - hence the reason for the cryo treatment. However, in my case I suspect compressor surge has killed my turbo. Grant mentioned the T04Z has a much better bearing pack than the 30 series of turbos - so should last longer.

PJ's car just ran a 10.4 at 136mph with the 3037 on E85....which I understand is possibly a record for an s13 on radials.

Since your in Perth...ring Grant at Per4manz turbocharges who specialise in turbo rebuilds and determine whether it is rebuildable. Also ask about having the bearings crygenically treated - he claims to have never had a turbo fail after having this done. http://www.per4manz.com/index.htm

Is getting a "legal" CAT actually required or is it just marketing hype? Consider this: If a car hypothetically meets the IM240 emission testing standards with a "non-legal" CAT.....is the car legal? Conversely, if a car hypothetically doesn't meet the IM240 emission testing standards with a "legal" CAT......is the car legal? Thoughts?

Of course they did......thats why the Honda got out of control too....right.

Mate of mine runs a 500+rwhp Holden 202 turbo motor in his sub 1200 kg LH Torana. All I can say after going for a ride in it is you need to put some money aside for some serious brakes like AP's or similar .....or a parachute.

NYTSKY, Is it your boost controller perhaps....the boost curve seems lazy when it comes onto boost as well....only making peak boost at 4900 rpm and immediately starts declining.

Haha....yes always modifying for that bigger "fix" once you get used to it. I'm always fascinated how enthusiasts are raising the bar all the time - its amazing what people are screwing out of there motors these days. However, what was awesome last year is average this year....and so on......where will it ever end.

After 400,000klm's you never need to do an oil change.....you top the oil up....it leaks out the bottom.....you top the oil up next week...it leaks out the bottom the following week....and so on. New oil every week.

With a 3076 tho? OK techically PJ is running a T25 flanged HKS 56 trim 3037 on a 2 litre. Bigger turbo's on bigger engines make bigger torque so you'd kinda expect more fryability.

Yes frying 4th at 160klm's. He wasn't using the water injection in that 503hp dyno run.....insanely enough there is more power to come. So he's found and extra 50 odd rwhp from the bigger ex housing, 1 psi more boost, upgraded fuel system, M&W CDI and retune. He also mentioned EGT's were way down with the larger ex housing - as you would expect.