Hi Friends,
I have a 93 Z28 LT1 Auto and have installed the comp cam 07-305-8 276HR-14 cam. 220-230 .510.510.
I have been using the Ed Wright power chip with the stock cam for 2 years and the car ran great. Other mods include 373posi and aeromotive fuel pressure regulator set at 55lbs, 80 series flowmaster and NO cat. I know a higher stall would help, but honestly right now the cam shows shows no real power band. I contacted comp and they recommended throttle body, bigger runners, and head work. I was expecting to hear 30lb injectors and headers. I was not expecting to go that far into the project to get it to run. This cam is very similiar to the chevy Hot Cam and they don't require all that to get their cam to perform. Comp cam rep says this is only a top end cam. What I really wanted is a cam that would come on at 2500 and pull hard all the way to 5700 or 6000.
I wish I could use this cam because the car has a wicked Idle. Did I install the wrong cam or can I make this work???
Appreciate any advice, it was a ton of work

 

That cam should work fine for the street. It's actually pretty mild all things considered. Headers will definately help, newer injectors probably woudln't hurt. Have you had the car tuned for the cam yet?

 

You have a cam without headers? No wonder you didn't notice a significant gain.

Put headers on and watch the car pull like a bat outa hell.

:-P

- Z28WannaB

 

is your car tuned for 55 psi

 

If you dont have headers, you are loseing a lot.


Also you need a tune esp if you dont have headers.


Get a hold of Ion at Madz28.com or Alvin at Pcmforless.com either of those two will guide you in the right direction

That cam should be fine with a stock t/b maybe an upgrade to 24lb injectors and stock heads. Also a 2.4-3k stall will help out.

 

I'm guessin that chip you already have is tuned for the stock cam specs. you should go to PCMforless or MadZ28 and get a new tune to match everything in your setup. also get some headers and mild stall and you'll really feel a big difference.

 

HaHA
I just noticed that the comp tech guy said bigger runners. He must have thunk you had a TPI car "aggggh Idiot"

 

I did contact Fastchip (Ed Wright) today via e-mail and inquired about a custom chip. Maybe I should contact other tuners for advice. I guess headers and y-pipe are next, but honestly I thought the car would run decent before I could afford all the add ons. I have made other cam swaps on other cars and they all ran better and with each new add on they continued to improve.
Will this car have a mid-range pull with headers, 30 lbs injectors and a custom chip???

 

The aftermaket chip seems to handle that very well. At 55 lbs its jumped more off the line and showed better midrange. Remenber this is a 93z and they used stock 22lb injectors. So bumping the pressure to 55 made it more like 24 pound injectors. not really a big change. But that was when I was using the stock cam.

 

with the bolt ons that i already had, the headers made it just keep pulling in teh upper rpms, like 4000 and above.
i think headers is your main problem, but a tune would definetly do some help
GL

 

I too modded my car backward remeber this is a Caprice it is an LT1 but in a heavier car stock was low to mid 15s cam netted me 14.9, stall got me 14.1 gears(2.93 to 3.42s) dropped that to 13.9 headers dropped it to 13.2 with slicks or 13.6 on street tires and I think there is a little more left in it will find out sunday. I had the right tuning every step of the way.

 

I have had my Camaro programmed with Ed a couple times now. When I installed my last cam and was planning to put AFR heads on my car I asked if I would need a larger throttle body...they said no. According to Ed, they have done dyno testing with the stock, 52mm, and 58mm throttle body and showed no gains. This was also tested on Ed's LT1 race car with the same results. I'm sure a couple people on here will call me a liar...but call them and ask them for yourself. You also might want to talk to Lloyd Elliot at eportworks.com and see about some ported heads to REALLY makes that cam come alive.

Zach

Something else you need to know about the difference in the GM HOT Cam and a CompCam or any other aftermarket cam is the ramp rate. The HOT cam is still considered a variant of OEM, so it ramp rate is less aggressive...your Comp opens and closes the valves at a much higher rate; duration, lift, and LSA are not all that makes a cam.

 

According to Comp, the 07-305-8 powerband is from 1500-5500 rpm. They only recommend a modified computer for your cam. To see the real gains of any cam your car has to be programmed for the cam. You can go here http://www.compcams.com/Technical/Cu...ML/198-199.asp to compare your cam to the other "off the shelf" Comp LT1 cams. BTW...I use a Comp 07-503-8 now, my car had a nice lope before it was programmed...but almost no lope after it was programmed.


When I put my HOT cam in my car, Ed told me I might not need a tune. I was told that my car would take 30 "cycles" to learn the cam. After 30 cycles it would either learn the cam, or not...and if not I would need a program. A cycle, according to Ed, is starting the car, getting to operating temp with normal driving, then letting the car cool completely. My car did fine with the HOT cam with no program, so maybe your car will "learn" the cam.

 

Thats very interesting!!....What year is your car? Are you talking obd1 or obd2. My car being a 93 is an OBD1.

 

My car is a 94, so OBD1 also.