Upgrading from Tomei 260's to 270's Solids

[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 dyno 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).....also shows 24psi by around 4000rpm even in 4th....5th gear (1:1) is better still.



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. Notice how it holds up power reasonably well at this rpm even with the 260 hla's......in any case the power nosing over is more likely attributable to the boost dropping as show in the dyno. Boost curve in general is a little rough

I know the scaling is crap on the horizontal line. One day I will get a better printout.

[Teambadrun]

Originally Posted by 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 dyno 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).....also shows 24psi by around 4000rpm even in 4th....5th gear (1:1) is better still.



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. Notice how it holds up power reasonably well at this rpm even with the 260 hla's......in any case the power nosing over is more likely attributable to the boost dropping as show in the dyno. Boost curve in general is a little rough

I know the scaling is crap on the horizontal line. One day I will get a better printout.

That setup seems quite laggy too, you are making sweet fuck all power at 4000rpm and you claim thats full boost.. Who cares what "BOOST" you are making at LOW rpm it's about POWER @ low RPM...


Israel guy, you shouldn't worry about 270DEG cam's unless its purely drag.
Friends racing S15,( also myself) run a TD06H-25G 10cm and we make bucket loads of downlow POWER and super early boost... 260,260 12.0mm solid lifters.
HLA are really really really shit and you should definately just get 12mm 260 camshafts. Cam gear adjustment will depend on your setup, with big big turbos it might help you downlow by 20rwkw(30rwhp or so) but you will sacrifice topend.

[juggernaut1]

Originally Posted by Teambadrun

That setup seems quite laggy too, you are making sweet fuck all power at 4000rpm and you claim thats full boost.. Who cares what "BOOST" you are making at LOW rpm it's about POWER @ low RPM...

Haha if i wanted power low in the rev i wouldnt be wasting my time with an sr.

Anyway mine makes around 180rwhp at 4000 which is as good as most 2871R's with similar cams and I have more top end.

I also ditched the stock intake and chose the Hypertune intake for a more linear power delivery rather than a more focused hit of torque in the mid-range. Plus it runs a full exhaust and legal cat which no doubt impacts on the overall power curve.

[Teambadrun]

Originally Posted by juggernaut1

Haha if i wanted power low in the rev i wouldnt be wasting my time with an sr.

Anyway mine makes around 180rwhp at 4000 which is as good as most 2871R's with similar cams and I have more top end.

I also ditched the stock intake and chose the Hypertune intake for a more linear power delivery rather than a more focused hit of torque in the mid-range. Plus it runs a full exhaust and legal cat which no doubt impacts on the overall power curve.

SR makes shitloads of lowdown power man, i am making 225RWKW by 4000RPM and thats on pump 98... and NO NOS.. with nos its nearly 300rwkw hahhaa but thats upto you really.. each to there own. I dont think you should have low power for circuit, look at japan.. everyone has 600PS or over!
Circuit car = power!