i have a street dominator and 650 double pumper on here now and i want to go back to tpi. will this cam work with the stock chip and my maf style tpi setup? i eventually am going to get the prom burning equipment so i dont want to buy a mail order chip right away, just wondering if the car will run ok with the factory stuff and this cam, its not a huge cam but it is 110 lsa and fi needs higher lsa from what i hear.

if i have to get another cam thats not a huge deal but i would definitely like to use this since it has about 500 miles on it.


cam specs

Xtreme Energy 268H Hydraulic Flat Tappet Camshaft Complete Kit
Lift: .477/.480''
Duration: 268/280°
RPM Range: 1600-5800

 

The only thing that may hurt is that 110 LSA. Since you have the MAF setup, you might be able to get away with it since the MAF is fairly forigiving. How's your vacuum at idle? I put a ZZ4 cam in my 355 which is a little bigger than your cam (.474/.510 duration on a 112 LSA) and it runs fairly well on a stock 350 chip. I know it could be better with some tuning, but I will experiment with that when the weather warms up.

 

i guess i should mention the tpi is from a 305 and this is a 350 bottom end with gmpp heads. how well does your car perform with the zz4 cam and stock chip? i am wanting to put this tpi back on to keep the car original. but i would like to retain the 350 shortblock which is non-roller unfortunately. would it run if i put larger injectors like in and kept a hypertech chip for the correct tpi in there for awhile.

 

I'd change the cam if it were me. You can get the same cam in a Computer Controlled type which is 114 LSA. You'll have the intake off anyway, and it's only another $225 for a new cam and lifters. Also get some 24# fuel injectors and an AFPR.

 

It would run pretty good if you put 350 injectors and a 350 chip in the ECM; that's what I did. I started with a TPI 305 and ran that for about 5 years. I then built the 355 and dropped that in with the original TPI. I scored a set of LT1 injectors from a buddy and bought the PROM burning equipment. Now, I have not played with the timing tables or anything; I just started with a stock program, changed the injector constant, rev limiter, fan turn-on stuff, and that's it. My car does run well for what I have done to it, but I'm sure there's more in it.

 

ya i considered doing this but i kinda put it to the side since this cam has like 500 miles on it max. i just wanted to see if what i have now would work with the tpi. but you guys think the xfi 268 cam and the 24# injectors would work well with a stock chip untill i get the tuning equipment? i think this is the way i want to go.

also the heads i have on there now are the intake face how hard is it to mod the tpi intake to work with old style heads? or should i get some work done on my 305 heads and put those on?

 

I have a 270 with a 110 LSA and my computer absolutely hated the cam, never ran right, so I had to switch to carb. I even tried getting a custom prom burnt but that didnt do crap. If you go back to tpi, take the safe route and get a cam that is advertised as "computer compatible". I mean, I had a MAP setup so that might have been it, but I would still play it safe and save the headache.

 

try find some aluminum L98 heads, they're plentiful and reasonably priced. the cam isn't too aggressive, but it will make the computer hunt a bit. I think if you reset your IAC you'll be ok for a while until you get into prom burning.. mind you I'm no expert thou. To reset your IAC and set minimum air, follow this; http://www.iroczone.com/techartidle.html

Heck the LT4 Hotcam ran in my car with the stock prom and an IAC reset.. it stalled and had a really low/lumpy idle, but when I was on the throttle or the highway it ran fine. Driving in town can be a chore with the stop and go because it wanted to stall. After resetting minumum air, it ran alot better.

The 305 TPI will work fine, the TPI's themselves are generic from 305 and 350. Check this website for the complete list of things needed to be converted; http://tpiparts.net/305_tpi_to_350_tpi_conversion

BTW, I have a complete TPI setup from a '89 350 firebird for sale if you need it.

 

no i have the full tpi setup but i just need to get some bigger injectors. i have been reading a little into the prom burning and it seems like i would be better off switching to speed density am i right on this assumption? and to switch from maf to speed density all i need is the chip right?

i have been looking for the 113 vette heads and cant find them around here anywhere. those heads and the xfi cam and bigger injectors would be ideal for me but i just put 1500 in this motor it sucks paying it again, but i hope i can get some money out of my car stuff and these gmpp heads that are practically new.