help selecting cam
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Joined: Mar 2002
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From: honolulu
help selecting cam
I have an 86 IROC with a TPI 305. I know that there is a whole lot of talk about cams on this site but to tell you the truth, I am confused about the whole thing. Right now this is my daily driver but some bad ETs at the local strip has got me going crazy to get this thing faster.
I heard that the 86's cams were toned down from the 85 causing a signifigant decrease in HP. So I figured this would be a good place to start to make up what was lost and add a little extra.
I have been considering a summit cam for TPIs(SUM-G5000). It says that they put one in an 86 with a chip and got 40HP. Has anyone out there tried this cam? Is there another cam that will give me more HP and work well with the computer?
I really don't have any other mods besides a highflow cat and flowmaster. I plan to install headers and a AFPR when I do the cam project.
If someone could please give me some advice on this I would greatly appreciate it.
I heard that the 86's cams were toned down from the 85 causing a signifigant decrease in HP. So I figured this would be a good place to start to make up what was lost and add a little extra.
I have been considering a summit cam for TPIs(SUM-G5000). It says that they put one in an 86 with a chip and got 40HP. Has anyone out there tried this cam? Is there another cam that will give me more HP and work well with the computer?
I really don't have any other mods besides a highflow cat and flowmaster. I plan to install headers and a AFPR when I do the cam project.
If someone could please give me some advice on this I would greatly appreciate it.
Supreme Member
Joined: Jan 2001
Posts: 7,164
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From: Someone owes me 10,000 posts
Car: 99 Formula
Engine: LS1
Transmission: T56
Axle/Gears: 342
I've told by some experts on here, that the Summit cams are based on 80's technology. With that said, Comp seems to make very high quality cams, I was recommended the Comp XE268 which I still need to buy.
Try to get a jegs catalog they have some info in there on selecting the right cam.
Though I would recommend getting headers first. As the exhaust is a big restriction on your motor, and without a free flowing exhaust a cam won't meet its full potential.
Try to get a jegs catalog they have some info in there on selecting the right cam.
Though I would recommend getting headers first. As the exhaust is a big restriction on your motor, and without a free flowing exhaust a cam won't meet its full potential.
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Joined: Aug 1999
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From: College Station, Tex USA
Car: 89rs
Engine: 400Sb
Transmission: Tremec 3550
if this is a 5 speed the XE268 is a good choice
If we are talking an auto trans 305 (and your not changing rearend gears or adding a stall), I would go with the XE262 (or the XE256-12)
the 256-12 is ground on a 112lsa and the 262-14 is a 114. The 256 will most certainly make more midrange power and possibly not much less peak hp than the 262.
the 256-12 is ground on a 112lsa and the 262-14 is a 114. The 256 will most certainly make more midrange power and possibly not much less peak hp than the 262.
Last edited by jcb999; Apr 11, 2002 at 07:15 AM.
Thread Starter
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Joined: Mar 2002
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From: honolulu
Right now I have 3.08 gears. I wasn't planning on changing the stall converter but If I need to, I will. That would be a good reason to put in a shift kit. My main concern is the computer accepting whatever cam I choose. A little bit of a rough idle wouldn't bother me, but I want to make sure that it is going to be streetable.
If I needed to change gears and stall to make this all work, what would you suggest?
If I needed to change gears and stall to make this all work, what would you suggest?
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