Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum - View Single Post

4x4le · 10-26-2012, 10:48 AM

I held tq flat to 8k on my sr at 22-23psi on a 2871r .86 ar t2 flanged turbo. It was 376whp on a dyno dynamics. This was with rocker arm stoppers only and never threw any rocker arms.

I did change cams for my current setup that I have not got running yet but only because I lost oil pressure from the broken sump...... The cams may have been ok but I could see discoloring on the front lobes and a slight groove at the tip of the front lobes. The cams I went with were still stock nissan cams but the intake is from a usdm sentra se-r with the highport sr20de (fwd) and the exhaust cam is from a gti-r which yes the gtir was a solid lift cam but that same cam was sold by nismo as the "nismo" cam for hydro lift engines before jwt started making the nismo cams.

Both of my cams are now 248 duration but I would have been glad to re use the stock cams if I would have felt they were fine.

What it would take for me to want to use cams would be when I had a turbo that spooled so late that the only way for me to have a good power band was for me to increase how high the engine could rev and flow air effectively at that rpm. The issue with this for me and you is that with a stock ecu that is tuned there is no tuning that can be done past 8125rpm iirc. And Im yet to see an enthaply or jwt tune that scaled their tunable rpm range over 6800rpm!

So now say that you have a brand X ecu and you have stock cams and you dyno. Changing cams may very well increase your power but its not mostly because of the cams, its in spite of the tune.
If you had brand Y tunable ecu and tuned with stock cams and then changed cams to something aftermarket and then retuned you would be surprised to see how much you give up down low and how little if anything you gain up top.
Upgrading parts to make an inferior tune more useful is counter productive imo.

People add them by default on builds, so few people realize what they're not missing.

Im sure there are some people grumbling under their breath right now, if you want to prove me wrong post up some graphs, before cams and after cams, tuned for tuned. (no graphs will be posted)

10-26-2012, 10:48 AM	#7
4x4le Zilvia FREAK! Join Date: Nov 2008 Location: Manchester, Tn Posts: 1,253 Trader Rating: (1)	I held tq flat to 8k on my sr at 22-23psi on a 2871r .86 ar t2 flanged turbo. It was 376whp on a dyno dynamics. This was with rocker arm stoppers only and never threw any rocker arms. I did change cams for my current setup that I have not got running yet but only because I lost oil pressure from the broken sump...... The cams may have been ok but I could see discoloring on the front lobes and a slight groove at the tip of the front lobes. The cams I went with were still stock nissan cams but the intake is from a usdm sentra se-r with the highport sr20de (fwd) and the exhaust cam is from a gti-r which yes the gtir was a solid lift cam but that same cam was sold by nismo as the "nismo" cam for hydro lift engines before jwt started making the nismo cams. Both of my cams are now 248 duration but I would have been glad to re use the stock cams if I would have felt they were fine. What it would take for me to want to use cams would be when I had a turbo that spooled so late that the only way for me to have a good power band was for me to increase how high the engine could rev and flow air effectively at that rpm. The issue with this for me and you is that with a stock ecu that is tuned there is no tuning that can be done past 8125rpm iirc. And Im yet to see an enthaply or jwt tune that scaled their tunable rpm range over 6800rpm! So now say that you have a brand X ecu and you have stock cams and you dyno. Changing cams may very well increase your power but its not mostly because of the cams, its in spite of the tune. If you had brand Y tunable ecu and tuned with stock cams and then changed cams to something aftermarket and then retuned you would be surprised to see how much you give up down low and how little if anything you gain up top. Upgrading parts to make an inferior tune more useful is counter productive imo. People add them by default on builds, so few people realize what they're not missing. Im sure there are some people grumbling under their breath right now, if you want to prove me wrong post up some graphs, before cams and after cams, tuned for tuned. (no graphs will be posted)