Stock cams with upgraded valvetrain, intake mani spacer

[boost addict]

Im having problems with bad lag so Im thinking of 2 solutions. One being to go back to my stock cams but I want to know if there would be able issues doing that with bc valve springs and retainers? I was also thinking about runner length on my intake mani. I was told just an inch longer would help considerably. So heres my next question, instead of actually having material added to the manifold itself what if I was just to put an inch space in between the mani and head, somewhat acting like a longer runner. I know honda guys do this but then that would also move the injectors back an inch so would there be any issues with how the fuel mixed with the air?

[e1_griego]

What turbo? What cams? Presumably SR?

[boost addict]

Yes it's an sr, precision 5558 journal bearing(but even precision told me with a turbo that small a dbb wouldn't do much) .62ar, BC 264's

[Mikester]

This may help if you haven't already seen it: http://zilvia.net/f/tech-talk/429924-precision-turbo-owners-thread.html

Also, if it's like this:http://i129.photobucket.com/albums/p204/beemsmx6/IMAG1029.jpg (http://api.viglink.com/api/click?format=go&key=44dc742c6ae854c912590be5122f2e42&loc=http%3A%2F%2Fzilvia.net%2Ff%2Ftech-talk%2F429924-precision-turbo-owners-thread.html&v=1&libid=1352151273483&out=http%3A%2F%2Fi129.photobucket.com%2Falbums%2Fp 204%2Fbeemsmx6%2FIMAG1029.jpg&title=-%3D%20The%20Precision%20Turbo%20Owners%20thread%20 %3D-%20-%20Zilvia.net%20Forums%20%7C%20Nissan%20240SX%20(S ilvia)%20and%20Z%20(Fairlady)%20Car%20Forum&txt=&jsonp=vglnk_jsonp_13521514510512) that's a pretty big ass turbo... It's not going to reach full boost until the uppr rpm range... If anything, 264 cams may not be enough...

But I bet if you post in that thread, the Precision owners will be able to point you in the right direction.

[boost addict]

Yea ive got that same turbo. It might be big to some people but should not be so laggy. My plan of going back to my stock cams are to just shift the powerband back over for better spool even if i loose some top end. Im also gonna change my IC setup for shorter pipes/different diameters. I make 420 on 17psi somewhere around 5k. Idk exactly where cause I didnt even bother to really look at it once I noticed how laggy my boost curves were. I was pissed.

[fliprayzin240sx]

5K is super fucking laggy. My damn GT3582R was boosting at 5k but that shit was bigger than this turbo and I put down 500hp. You can get it retuned by a different tuner. They can tune it to make more power sooner so its useable but you'll sacrifice the top end.

[codyace]

Keep the stock valvetrain, and run Jim Wolf Technology S3 cams. Install them as OEM. Midrange monsters that retain the power till redline :D


Seriously though, I'd personally re-evaluate your current cam choice. They are known to be relatively 'soft' for power.

[boost addict]

Well I have bc springs and retainers already in, I already have the stock cams so Ill throw them in just to see what happens. I just want to know if theres any problems with them, maybe extra strain on the cam itself?

[codyace]

The thing is by going back to stock cams, you're not givig up the 'meat' of your power band from that turbo, for a marginal increase in spool up/low end.

It's all about creating the total combination of your parts. If you want spool up/low end, you're going to give up that top end power you can make with the turbo. And vice versa. To me, I'd evaluate how you drive, and what you do with the car. A 380/400 whp car with a nice fat powerband is going to run circles around a lagggy 425 peak car ya know?

[boost addict]

Giving up top end is completely fine with me, I make the same power at 17psi I did with my last setup at 22psi. So if I need to I can just up the boost but Im not trying to make crazy power. The car is driven at events, more next year than I went to this year and at the ones I went to this year the low end was just not there and the powerband was way to peaky. So back to the original question, stock cams with upgraded valve train. No problems with that right?