My Sr20 Build - Twin Scroll 3071

[juggernaut1]

Had the car back on the dyno yesterday - some dyno figures for you.

The first two dyno runs were done in 4th gear in my car which is not a 1 to 1 ratio (I'm running a close ratio Nismo box)

The second of those two dyno's you will see overlayed over another dyno (thick black lines). This compares my twin scroll (thin lines) with a single scroll 3071 on a 6Boost mani with stock intake (thick lines).

As you will see I'm making 20 psi by around 3600 to 3700 rpm - insane considering this was not done in 5th gear (4th gear in normal car). It is also remakable given that I am running a .78 ex AR and 4 litre plenum and short runners.

The second two dynos were done in 5th gear (4th in normal car) - so we are now running a 1 to 1 ratio. Interesting how the gear ratios affect torque and hp?

You will note that my boost is falling away in the higher rpm as I need to sort out the boost controller so that it will hold boost.

If I can get it to hold boost I think I will be able to maintain max torque to the redline resulting in even more hp.

Played around with VCT and is on at 1500 rpm and off at 7000 rpm.

Played around with ex cam settings and ended up retarding the ex cam a few degree. We lost about 10 hp at peak but gained 15 at peak through the midrange. Overall retarding the cam resulted in more area under the curve even tho it was at the expennse of peak hp. It also spooled the turbo about 150 to 200 rpm earlier

As you can see the temps in Perth yesterday were hot but it still cranked out some reasonable numbers.

I took it for a drive last night in the cooler (but still warm) conditions and this car hauls ass. It actually doesn't feel like a turbo car it feels like a big cube V8 under the bonnet. By 4000 rpm it is hauling ass all the way to the 8000 rpm cut out. I can't wait to fix up the boost issues and take it for a drive in cooler conditions.

Anyway enough of my ranting.

Edited March 10, 2009 by juggernaut1

[Gts-t]

Nice results mate, id love a twin scroll setup. +1 for giving it a go and getting some good results, when you get the boost control sorted post some better quality graphs

[juggernaut1]

Thanks.

Although a few bugs to iron out .....its a fantastic car to drive as it is. What the graphs don't show is the part throttle response.......which is just scintellating.

Edited March 10, 2009 by juggernaut1

[Equinox]

Looks amazing. One of the best SR20 setups I have seen.

What cams is it running?

[juggernaut1]

Only little Tomei 260/260 hla's and yet easily rev's to 8000.

Boost is pretty savage - I've nearly spun the car a couple of times coming onto freeway on ramps with part throttle.

I'm also getting compressor surge in the higher gears under 4000 rpm.

Edited March 27, 2009 by juggernaut1

[pepe lopez]

Lots of power, must go great. I miss my S15.

My S15 ran a T518Z, made 259rwkw, around 340rwhp , which was plenty fast, but it also made 200rwkw , around 266rwhp, at 4000rpm. I had a PAR engineering gearbox, all runs in fifth - 1:1 ratio.

It was mounted on a HPI manifold. The manifold gave my 10kw at the top and 22kw at 4000rpm. Best $1,500 I ever spent. Transformed the car.

I only ran the car once at Calder, blew the clutch mid track, ran 13.0 @ 70mph. The SS Commodore in the other lane ran 13.6 @ 106mph.

[juggernaut1]

Yes the 518Z is a great turbo - fantastic mid-range.

I'm currently running the short runner/big plenum Hypertune intake - so I'm sure if I went back to the long runner/small plenum stock intake my mid-range would pickup - which would be an interesting exercise for another day.

[pepe lopez]

Comparing dyno sheets with mxfly at the time revealed that the Trust unit made 80rwkw more at 4000rpm than the HKS GT-RS. mxfly sold his turbo soon after lol

I too had the Tomei cams you have, doing all my parts adding one at a time on the same dyno revealed the cams added more power than any other mod. The turbo added 20rwkw ( 180 - 200rwkw) then the cams were added and it went from 200rwkw to 225 rwkw. Manifold and more tuning, other small parts, 100 octane shell fuel, made up the rest.

Gearbox aside these are the perfect RWD vehicles at an affordable price in my opinion.

[juggernaut1]

Here is the link to the previous thread I started showing some engine bay pic's for anyone that cares:

http://www.skylinesaustralia.com/forums/Sr...cs-t249832.html

[nfi]

Awesome effort. That curve is impressive.

[abu]

Yes the 518Z is a great turbo - fantastic mid-range.

I'm currently running the short runner/big plenum Hypertune intake - so I'm sure if I went back to the long runner/small plenum stock intake my mid-range would pickup - which would be an interesting exercise for another day.

Nice result mate, just wondering what the Hypertune plenum set you back? Considering getting one for my S13, PM me if you want

Thanks

[juggernaut1]

Not cheap - from memory plenum was just under $2K, plus their 76mm throttle body around $630, plus their fuel rail. Hi Octane sells their gear so you could check out the current prices on thier website.

Not sure whether they make one for the s13 at the moment(I assume this is the high port SR). I have the low port SR. However, I have spoken to the guys at Hypertune on behalf of somebody else and they indicated they would build a custom one for the high port motor.