i bought a 88 iroc that i was told ran with the tpi setup
but it was changed over to a carb.
im going back with the tpi but i have been told the cam might not work
what do yall think?
the cam is 230/230 @ .50 with a sep of 109 and i have 1.5 roller rockers
not sure on the springs
will the car run ok or do i need to swap cams, if so which cam with out doing head work
Thanks

 

The cam size doesn't matter as much but there are cars that need certain lobe separations. Computer run cars need 112 or better, Carbed cars can use 112 or lower.( the 112 makes more vaccum for the computer to use to figure out the timing) So yes you need to find that out....

 

The TPI system might run OK the cam you describe, but I think a custom PROM chip would allow the cam to perform.

 

A custom program is going to be required if you expect that cam to perform.

 

thanks for the in put that cam wont make a lot of vacuun right?
if so should i put on a vacuum pump for the brake boster or if the a/c and heat duct open and close with vacuum not sure if they do?
Thanks

 

The computer cannot do its job with too little of vaccum, carbs can but comps can't. You need to figure out the lobe separation for the car to perform right....

 

Computers can pump all the fuel the cam could ever need. It takes time to understand how to program the computer to match the cam. With a histogram, you can very quickly figure what vacuum is rich or lean.
100 Kpa = Open Throttle
20 - 30 Kpa = Idle

dave w

 

Again.... if the car cannot make the amount of vacuum necessary the computer cannot figure out the timing therefore the car will always run like crap.....

 

I've programmed several PROM chips. The fuel map for each vacuum RPM cell needs new values programmed into each individual fuel cell vacuum map. No it's not easy to change all the individual fuel cell vacuum maps! I've done it, and radical low vacuum cams can be used with EFI! Want to go to the race track with me and let me PROVE IT?

dave w

 

I'm sorry i didn't know you were an expert with 54 posts..... Sorry man, my bad.

 

Not a big deal. I don't really have much time to spend on web tech boards. I thought the screen shots from my TunerCat software ( http://www.tunercat.com ) and my DataMaster software ( http://www.ttspowersystems.com/DataM...downloads.html ) was an indicator I had tuning experience.

dave w

 

thanks for the help yall i think i will go with dave and run that cam and get a really good tune
Thanks

 

I don't want to see a new thread in the future then about how you car won't run right.

 

Use tuning software from VEMaster http://home.comcast.net/~jgeorger/vemaster/index.html

dave w

 

is that program for the speed denity sensor of maf?
because i think i have the maf

 

Speed density. Maybe the DIY Prom board types knows of a program for MAF?

dave w

 

If your such a good tuner then you should be able to tune any type of EFI for him no problem.

 

A cam with that LSA is tuneable. It'll just be a total PITA.

 

PITA ????

 

"Pain in the ****".

 

http://www.speedsecretsefi.com/