I know, I know... I shouldn't even be thinking about it, but I have everything I need to put an 847 in my 93 and I don't think I'll have time and patience to do LTs, mounts and y-pipe this year, so it will have to wait until spring. (car will be stored with the first snow and taken out when it's dry and nice)

I'm hoping that weather will allow one more track day after I'm done installing the cam. So what can I expect? The car will also have stock heads with 1.6 rockers. It's a 700R4 and I'll probably just let it shift on the factory shift points for now. (55-5600ish is stock, but will probably move up some with the added power)
Thanks.

 

What are the specs on the 847 cam?

 

I'm a little suprised that you're asking this.
I think you're going about this bass ackwords. A stock engine will benefit from headers and/or heads but not necessarily a big cam. You could even lose power. Besides you have to tear evey thing down anyway so why not wait until you at least have the heads.
My humble .02 worth.

 

Patience Ion, patience....

I know you are itching to put that cam in but imo, a job worth doing is worth doing well, put the supporting bolt-ons in at the same time...

 

I would just install the headers at the same time as the cam. You're doing a prety extensive job to begin with, so why not do the headers too?

 

madwolf you do OBDI programming right?? i sold my obdI to u a couple months ago..

Im sure u know that you wont beable to rev high enough to gain optimial use out of the cam.. your lower rpm range will hurt...

Basically what i see is your idle being rough, a loss in low end power but an increase in top end... You'd probably see better results (not peak) from a hotcam especially without exhaust..

I'd hold off on it...
that cam is big shelbyz28... something like 234/242 intake/exhaust duration.

 

obviously he wants to put the cam in without the headers first, he doesnt have to do them at the same time and he definately will see upper rpm power without aftermarket heads. Now I really dont know your setup (torque converter? gears?) but you should see overall gains unless the cam is too too big

 

Well, I've done tuning for smaller cams with stock heads and manifolds before and they saw a nice gain. I've tuned the 847 with ported heads and LTs and I don't even need to mention the gains there. BUT, I've never tuned a car with a cam this big, stock heads and manifolds, so that's why I asked for an opinion. atljar is running an 847 on stock heads with some impressive times, so the gains will definetely be there, I was just curious what would happen with the stock manifolds.
Anyway, thanks for the advice, I might wait to do it all at the same time.


PS. The car has a 2400 stall and stock 3.23s and I do not plan to rev it past 6200.

EDIT: Oh yes, I forgot to mention that I already have everything and I happened to get the 847 at a REALLY good deal, that's why I went with it.

I originally planned to go with a 224/230 since this will be my daily driver for a while. Heads will stay unported either way though.

 

Don't let popular opinion sway you. I say, go for it. There have some very impressive (wild) factory packages in the past that did NOT come with aftermarket headers. One other point to make. These (negative) opinions in this thread, are they based on what they THINK, or on experience? Go for it!

Don't be hesitant to report back, good or bad. And....try to be as controlled (variables) as possible.

 

Thanks arnie. I ordered a set or hooker lts and hooker y pipe from jet-hot today, so that isn't an issue anymore.

 

I hope your converter is big and loose

Mine is small and tight and it surges against the converter at idle with the hot-cam. thought I havent really driven it since i uped the fuel pressure.

 

Actually, it's only a 2400.
Two weeks ago when I installed it, I had no idea I was gonna do all this....


Then again, one month ago when I installed the engine, I almost sweared I wouldn't take anything out again.

 

I agree with arnie. You don't know what you will get until you try. I would imagine that it would see more potential power with headers, but if you do it in steps, you will know a little more about what gives what power, where.

I am sure you are writing all this off as a business expense, eh?

 

R+D should definately be a right-off. If not, you need a better accountant.

 

Absolutely!

"We", at MADZ28, strongly beleive in research, development and improvement. Beleive it or not, all these efforts have and will be done exclusively for the benefit of the Black-93-Z28-with-a-94-engine-stock-heads-and-a-233/239-cam owners.