im looking at a 2000.00 budget i have a 350 tpi in my gta. i have some mods done allready but im looking for 100 rear wheel horse more than what i have now. i know i will need a new set of heads maybe a cam if anyone has any ideas for me please let me know a cheap way to get a 100 more rwhp. thanks guys.

 

Id go for heads, cam, and full exhaust. It should be more than a noticable difference.

 

AFR 195cc's?

Or Trick Flow 23's with matching cam (summit sells them)

I would get headers too, they make a nice power increase, and its somewhat easy, since you have to take the headers off to do the heads. (If you dont have them already.)

Also, it might be a good idea to get a chip and bigger injectors.

Orrrrrrrr.....

Get a bigger intake system, headers, exhaust, and see how much you got at the end. Maybe some gears

 

Lose the TPI. Put something else on top of the motor. A Stealth Ram or something. It's highly unlikely that you'll get anywhere near 100 more HP for $1000 with that on there.

A ZZ4 makes about 350 HP, with a carb, little intake, and a mild cam. A Vette L98, with the identical same heads and compression, makes 240 HP. In other words, take a Vette L98, remove the TPI, put the ZZ4 cam and intake and a carb on it, instant 100 HP.

Not that you should necessarily change to a carb, of course; I only use that to illustrate the problem with getting reasonable HP out of TPI. But many other forms of FI are as equally capable of restoring the HP that TPI throws away, as a carb setup is.

 

i think im gonna stay with the fuel injection i also think you guys are right i should get heads,cam. im gonna go with heads,cam and port the stock base get long tube runners and see what i get also i will get headers. thanks for your help guys if you have any good suggestions on head and cam packeges some people say go with the zz4 cam is it a rooler cam? i want to keep the roller set up. i want a high compression so what heads do i use? 64,67,70 i dont know? do i have to change the push rods if i change cam and heads?what heads are cheapest? can i use pro lightining heads and zz4 cam? or should i go trickflo?

 

TrickFlows are about $800-$1000. AFR's are $1200-$1400.

The ZZ4 cam is a Roller.

High Compression? 64cc's will do the trick.

Ask the guys at summit for which lenght pushrods you should use.

I would definatly save some money for Injectors and the Chip. No use pushing all that air if the car cannot get enough fuel and running right.

 

Burning half your budget for heads doesn't make much sense to me. Port what you've got, do a few upgrades while you're at it, much better bang-for-buck.

A decent exhaust is going to cost about a third of your budget. Get that before you consider anything else, because without it whatever else you do will be choked.

The ZZ4 cam is as stated roller, meaning you can use your existing lifters and push rods. But, roller cams are more expensive than flat tappet cam/lifter sets - you might post a wanted on the classifieds to get that cam (there are a lot of take-offs out there) for a decent price. ZZ3 is the same thing, by the way.

When you port the heads (which you can do yourself with a good air compressor, die grinder, and $40 porting kit from Standard Abrasives), have the valve springs replaced and screw-in rocker studs installed. Cutting the guides to improve lift clearance and for installation of positive seals also a good idea. You can buy everything you need to do the porting, have the other machine work performed, and still pay less than new heads would cost.

Since you'll have the equipment to do porting work, port the plenum, like you said. Shorter fatter runners will be required to take advantage of the RPMs the cam is capable of. Adjustable fuel pressure regulator should be considered a must for tuning. Getting PROM burning equipment is also a good long-term investment.

Carb might be the cheaper way to power, but if a daily driver and/or emissions are involved, sticking with TPI makes more sense.

 

thanks guys for the info i appreciate it, i have to say the zz4 sounds like a good choice. i dont think going with the factory heads would be a good idea though i want aluminum heads,i allready have a flowmaster exhaust and a AFPR. i also have a 400hp fuel pump installed i just need 24lb injectors.i am definetly staying with the tpi i dont want a carb. so everyone thinks 64cc is a good choice on the heads? what about 200cc is that good for the heads? are my 3:27 gears good enough? i have a shift kit allready. anyone know if pro lightining heads are good? again thanks for the help.

 

Depending on what you need the Horsepower for, you could always do the Nitrous Oxide Injection, I know summit racing sells kits for TPI engines for an easy 100hp boost. They run right around $600. That is, if that's what you are looking for, a quick boost.

 

thanks but i dont want nitrous or a supercharger i want the power to come from the engine.