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jspaeth · 03-02-2010, 11:03 AM

I am not going to argue with you (Dave), because you know way more than I do, but I agree with Cody.

But I used to have a stock motor 2871r setup.

I added springs, retainers, HKS 264/264 cams, and a Greddy Intake manifold.

The old dyno is is solid, the new one is dashed:

My new dyno sheet shows that I have lost ~10-15 ft-lbs across the board, and that the torque comes in about 700 RPMs LATER than before.

There are 2 things to be said.

1) I don't believe the person that tuned my car did very much in the way of ignition timing with the new setup to maximize the benefits of the new cams (perhaps why tq is low across the board).

2) This person did not set up my boost controller well while the car was on the dyno.

*** Notice the drop off of power in the new setup around 6750 or so.
Driving the car on the street, the car was hitting 19 psi, but then was dropping down to only 16 psi from 6500 onward.

I tinkered with the boost controller, and now can hold 19-20 psi all the way to redline..

So that means my hp and tq curves aren't dropping off as much as you see.

*** Also, he didn't have the LOW end of the boost controller (AVC-R) set up well.

From the looks of the dyno, it looks like I am not hitting full boost until nearly 4500 RPM.

However, on the street, with my new EBC settings, I hit full boost (19-20 psi) in all gears, (starting from let's say 2500 RPM) by 3800 RPM or so.

3) My AFRs under full boost with the new setup/tune go as low as 10-11.
VERY rich.

Conclusion:

I think with some proper fuel/ignition tuning, as well as NOW having the boost controller set up the way that it should be, I believe my new setup (cams and Greddy IM) spools up NEARLY (maybe 200 RPM later) as early as the old setup, would make AS much tq, and most importantly, stretches my tq/powerband by as much as 1000-1500 RPM.

I should again stress that the dyno sheet above for the "new" setup (dashed) was under conditions where the boost controller was not setup properly (not reaching full boost until 4500, tapering off at 6500) and the tune is VERY rich and also the timing is weak.

03-02-2010, 11:03 AM	#5
jspaeth Nissanaholic! Join Date: Mar 2006 Location: Philadelphia suburbs Age: 37 Posts: 2,347 Trader Rating: (7)	I am not going to argue with you (Dave), because you know way more than I do, but I agree with Cody. But I used to have a stock motor 2871r setup. I added springs, retainers, HKS 264/264 cams, and a Greddy Intake manifold. The old dyno is is solid, the new one is dashed: My new dyno sheet shows that I have lost ~10-15 ft-lbs across the board, and that the torque comes in about 700 RPMs LATER than before. There are 2 things to be said. 1) I don't believe the person that tuned my car did very much in the way of ignition timing with the new setup to maximize the benefits of the new cams (perhaps why tq is low across the board). 2) This person did not set up my boost controller well while the car was on the dyno. * Notice the drop off of power in the new setup around 6750 or so. Driving the car on the street, the car was hitting 19 psi, but then was dropping down to only 16 psi from 6500 onward. I tinkered with the boost controller, and now can hold 19-20 psi all the way to redline.. So that means my hp and tq curves aren't dropping off as much as you see. * Also, he didn't have the LOW end of the boost controller (AVC-R) set up well. From the looks of the dyno, it looks like I am not hitting full boost until nearly 4500 RPM. However, on the street, with my new EBC settings, I hit full boost (19-20 psi) in all gears, (starting from let's say 2500 RPM) by 3800 RPM or so. 3) My AFRs under full boost with the new setup/tune go as low as 10-11. VERY rich. Conclusion: I think with some proper fuel/ignition tuning, as well as NOW having the boost controller set up the way that it should be, I believe my new setup (cams and Greddy IM) spools up NEARLY (maybe 200 RPM later) as early as the old setup, would make AS much tq, and most importantly, stretches my tq/powerband by as much as 1000-1500 RPM. I should again stress that the dyno sheet above for the "new" setup (dashed) was under conditions where the boost controller was not setup properly (not reaching full boost until 4500, tapering off at 6500) and the tune is VERY rich and also the timing is weak. __________________ Daily driven Last edited by jspaeth; 03-02-2010 at 11:39 AM..