is anyone running a rough idle cam in there tpi? i just want a real good rough sound that doesnt kill power. what duration cam should i get?

 

check out compcams , they can help you with a good cam pick

 

Do they have a cam that is a good size to use without having to reprogram the computer?


85 IROC 305 TPI

 

Forget that. You may as well learn to diyprom. It's a challenge to learn. A good feeling to know that you can make changes that make the car run better, and get better mileage also.

 

12-262-4 thats the cam i have and i have no check engine light... but it does need a tune...

 

My cam has 214/220 dur. w/ .503/.508 and its a everyday driver no check engine light needs tune badly but runs real good

 

What valve spings did you use with those cams?

 

If "sound" is all you want, and you're current power level is adequate, have someone re-tune the ECM tables...

 

Use a smaller lift cam and you will be able to get way with out retuning. I doubt you would want to retune your 85. Hardly worth it. That computer is junk and not worth putting any money in to. You can send it out to be tuned if you want instead of updating to a newer computer, but you could do this whenever if you are only going with a mild cam. A tune is always good. A fuel regulator would be a good idea for some tuning at this point. The 305 has a weak cam, and it is probably pretty worn out anyways. The old cam would probably need tuned more than it would for a mild new cam. You can still turn the distributors on these cars as well. As long as the car still runs decently with out many electrical problems you will be able to slide by.
----------
A nice pair of headers, y-pipe, and cat-back exhaust may also give you the nice rough sound you are looking for as well.

 

He's looking for lope though, so he needs to focus more on what duration level his stock ECM can put up with. With the stock tune, the MAF can only compensate for so much. As for lift though, I say the more the merrier...

 

i have the comp cams XR282HR with .510 and .520 lift and 230 and 236 duration @ .050. it has a pretty noticeable lope and it doesn't set any codes off in the computer. but mine is a SD system though. don't know if the MAF will change anything. i like it but it really needs a tune. i would go a little smaller though becuase it pushed the powerband way up high, but when it comes on it really comes on. not the best daily driver cam.

 

i used LT1 srings from Competeion Engineering set up for .600 lift also going to use them on my vortec heads im setting up now. thanks Daniel

 

I believe the vortec is a little different. It uses the same spring as the cast iron LT1 head. Crane makes a set for those two engines especially, 10309-1 I believe. Good for .550 with no cutting.

 

well that maybe so but my dad owns a machine shop so we have already put bronze guides, drilled and tapped from guide plates and going to set it up for 2.02/1.6 and ported and polished but thats not the best thing the heads were free i plan on putting in a bigger cam like .535/.555 lift so im going to set it up for .600. i took them down to shagwells house hes doing the porting for me ill have to get some pics when im done i have so while we were working on them what do you think?

 

I dont care if its MAF or SD, learn to tune if your going to cam it. Even if it works without tuning it will be far short of what it could be.

Dont worry about lope or sounding cool, pick a cam that benefits how the car is actually driven.

Daily driver, street/strip or straight strip.

U will be happier in the long run.

later
Jeremy

 

i plan on tuning my car using megasquirt i just havent gotten tey i have run into some problems and had to get the car fix its one of the many to dos on the list but for what i had done the car ran a 13.7 at 101 which from what i have seen and heard from people is good considering the little i have done