My Sr20 Build - Pics Inside

[juggernaut1]

I understand Ricky from Billet Turbos fame makes divided manifolds on a request basis (under the guise of Fantasy Manifolds) and has been doing so for quite a number of years apparently.

Also I spoke to Kyle at 6Boost about the prospect of making a divided manifold before I bought the Full-Race mani. I only went with Full-Race because the $A was $0.96 at the time (so the the price of the kit was half reasonable) and that it came as a complete kit i.e. I didn't have to separately source the divided ex housing (which I guess could have ordered through ATP) and down pipe (could have been custom made), v-band flanges, twin gates etc. Also Kyle had suggested to use the dual gates for true twin scroll on the SR setup even before Full-Race had started making them.

[Roy]

Hey Juggernaut, can you post an update of the full tuned setup?

[discopotato03]

There is one option no one seems to have looked into and that's using the big frame diesel GT35 T4 flanged twin scroll twin integral gate (TWIG - twin wastegate internal gig) housing and fit a Garrett GT3782R into it .

Sure it means profile turning a GT35 turbined housing to suit a GT37 turbine , which just happens to be in 78 trim instead of the 35's 84trim , but may be workable .

That would get you T4 flange/twin scroll/twin integral gates/a big frame turbo with the same compressor wheel as a small frame GT3582R - and in a REAL GT40 compressor housing - not the T04S one .

IMO the GT3582R is too much Bitzer , spin off from the HKS spec "GT3240" which had the turbine cropped and the comp wheel in 54T instead of 56T .

A .

[juggernaut1]

These are the only dyno's I have re the tune which as you can see were done a while ago. The tune was never completely finished because my tuner was borrowing a dyno on the day and ran out of duno time. Also need to fix up the boost drop in the top end. Note the ambient temp was around 36 degrees when these were done. I have had it on another dyno since in cooler conditions and it made a couple of more psi across the board at the same rpm - for instance it was making 26 psi by 4000rpm - no printout to show unfortunately.

This dyno done in 4th gear - (5th is 1:1 in my car as I have a 6 speed close ratio Nismo box):

Same dyno as above overlaid onto a different s15 with single scroll 3071 ex gate on 6boost manifold 256/256 poncams and stock intake.

This dyno done in 5th gear (1:1) after retarding the ex cam a couple of degrees - picked up more low and mid and lost top end - revved to 8,000rpm although shown in klm/h. I know the scaling is crap on the horizontal line. One day I will get a better printout. Going to try a 3076 and I have a 205 litre drum of E85 sitting in my garage. However, lost my licence for 6 months under WA's hoon laws (yes in this car) so not being able to drive knocks back the enthusiasm a bit to get it done.

Oh...and an update engine bay pic.

Edited November 11, 2009 by juggernaut1

[phunky_monkey]

I'll never tire of looking at that engine bay

[Roy]

Thanks!

[phunky_monkey]

What are you thinking of Troy?

[DVS JEZ]

looks shmick juggernaut. is the the highest power you have made so far?

i just fitted my 3071r t28 flange .86 56T, running a GK tech manifold modded for external gate, and running stock inlet.

cant wait to get it tuned with my solid 260 12mm tomei cams. hoping to make some numbers close to yours.

DVSJEZ

[juggernaut1]

Well thats the most power that its made that I have evidence of......which was the day of its initial tune after the motor was run in - but I'm sure it makes more power on a cold day/night....as any turbo car would

Actually I tell a lie - it made around another 10rwhp when the ex cam was straight up which was then retarded a couple of degrees.

Edited November 11, 2009 by juggernaut1

[skinart]

Engine bay looks awesome! Cleen as hell, love all the real braided lines. Nice work mate!

[PSI Parts]

Nice build. We are undertaking a similar twin scroll set-up at the moment.

In regards to the wastegate vacuum lines, it looks like you are using a boost controller and thus utilising both the side and top ports of the wategates?

I take it you have run it like this (using GReddy Profec B Spec II solenoid as an example):

1) plenum -> boost controller.

2) plenum -> solenoid (NC)

3) plenum -> solenoid (COM) -> T fitting -> top port of each wastegate

4) plenum -> T fitting -> side port of each wastegate

As this would help provide pressure on the diaphragm to keep the gate shut, instead of just relying on the spring.

[juggernaut1]

OK so my car is now at C-Red for the turbo and exhaust upgrade. They ran it on the dyno to get a base hp figure before the upgrades. I get a call from C-Red and they make the comment that the car has an excellent and progressive power curve for street and circuit duties, and that the power delivery is typical of a 6 cylinder.......and that they wouldn't change a thing including the turbo!!!

So now I'm in a quandry what to do.....Lol.

Don't worry Dane, you'll get the 3071 turbo.

They also picked up that the 3071 turbo was slightly surging as it came onto boost which is what I always suspected as the twin scroll setup seems to spin the compressor early in the rpm range....and which is why I was leaning towards the 3076 with surge ports as the logical upgrade. Another solution would be to advance the exhaust cam - when the car was initially tuned we retarded the ex cam a couple of degrees to give more low end at the expense of some top end.

Also before it went to C-Red I also changed the diff ratio from 3.69 to 4.08 and the acceleration is insane. I did keep the stock diff in case I need to revert back for improved traction.

PSI Parts.....my boost lines are referenced to the compressor....and not the plenum as suggested by you.

Will post up developments as they arise.

Edited March 16, 2010 by juggernaut1

[discopotato03]

If you have a look at ATPs site they are now selling twin inlet GT30 turbine housings in from memory 0.82 and 1.06 A/R ratio .

If I was going to do another turbo I'd think about a GT3076R and give consideration to the 52T version . You don't necessarily have to use the port shrouded compressor housing on a 2L four cylinder particularly if the turbine housing ratio is up there .

I don't remember what size your exhaust was off the turbo but if it'll fit 3.5" would be good - need big pipes for the first meter or so off these turbos IMO .

A .

[juggernaut1]

Disco,

I have both the 3076 52 trim and a 3076 56 trim turbo's at my disposal. I was going to opt for the 52 trim.

I had the .78 housing extrude honed in the states...but I am still waiting to receive this from the courier. The .82 and 1.06 came out after the housing was extrude honed....bugger.

Yes I have a 3.5 inch exhaust to go on. Will need custom 3.5 inch dump pipe to be made up....currently 3 inch.

Edited March 16, 2010 by juggernaut1

[discopotato03]

As I've said in the past the people with the smarts in the States really liked the 52 trim GT3037/GT3076R , and that was in single scroll form .

Just make sure the cartridges ID tag says 700177-6 or 3037-52T . For the 56T 700177-7 or 3037-56T .

A .

[STATUS]

OK so my car is now at C-Red for the turbo and exhaust upgrade. They ran it on the dyno to get a base hp figure before the upgrades. I get a call from C-Red and they make the comment that the car has an excellent and progressive power curve for street and circuit duties, and that the power delivery is typical of a 6 cylinder.......and that they wouldn't change a thing including the turbo!!!

So now I'm in a quandry what to do.....Lol.

Don't worry Dane, you'll get the 3071 turbo.

They also picked up that the 3071 turbo was slightly surging as it came onto boost which is what I always suspected as the twin scroll setup seems to spin the compressor early in the rpm range....and which is why I was leaning towards the 3076 with surge ports as the logical upgrade. Another solution would be to advance the exhaust cam - when the car was initially tuned we retarded the ex cam a couple of degrees to give more low end at the expense of some top end.

Also before it went to C-Red I also changed the diff ratio from 3.69 to 4.08 and the acceleration is insane. I did keep the stock diff in case I need to revert back for improved traction.

PSI Parts.....my boost lines are referenced to the compressor....and not the plenum as suggested by you.

Will post up developments as they arise.

Noice

[phunky_monkey]

I get a call from C-Red and they make the comment that the car has an excellent and progressive power curve for street and circuit duties, and that the power delivery is typical of a 6 cylinder.......and that they wouldn't change a thing including the turbo!!!

So now I'm in a quandry what to do.....Lol.

Don't worry Dane, you'll get the 3071 turbo.

Great to hear that C-Red think so highly of the setup, bodes well for the use of it with a 2.2 me thinks, unless the surging issue becomes a problem.

But I'll be really interested to see how you go with the 52 76R. Who knows, we may end up swapping turbo's at some point!

[juggernaut1]

Dane, you will love it....if its great on a 2 litre it will be fantastic on a 2.2. IMO surging will be less of a problem on yours as you have bigger cams and bigger cylinders. As previously stated I have ex cam adjusted for better low end too which may have contributed/caused the issue.

Edited March 16, 2010 by juggernaut1

[phunky_monkey]

I'm positive I will Ian!

I actually had my surging mixed up in my head just then, thinking it was too much efficiency in the engine for the turbo, rather than the other way around Funny, last time I checked I wasn't blonde!

[Harey]

What a setup! The engine bay is a work of art!

That dyno curve is so fat, the mid range is so strong. The twin scroll setup is obviously working wonders.

A 3076 would be very interesting...