1SLOLTX

i just purchased a 97 z28 and im wondering which bolt ons would make the biggest difference in my torque and horsepower ? i currently have a 58mm throttle body and slp exhaust

96SilverZ

iTrader: (2)

unfortunately the TB was a waste, and look at previous threads

Badazz 97 TA

iTrader: (18)

if your an automatic, a good torque converter will provide a nice gain in performance.

tbag_skywalker

The smart asses will tell you nitrous oxide, and technically they're right.

Otherwise long tube headers will give you the biggest gains.

Gears and sticky tires will make you even quicker though-- assuming you consider gears to be 'bolt-on'

zooguy

iTrader: (1)

people are going to disagree with me but i love what it did to my car

160* thermostat
TB coolant bypass
and a CAI
this nice lil combo gave my car about 20 RWHP

i know most was from the CAI but a hot TB that has coolant running through it will also have some heat soak in to the intake manifold thus SLIGHTLY raising intake temps. and the 160* t-stat keeps the motors temps down under 178*. i have a laptop and cable to confirm that the coolant temp never sees 180* and a cooler motor will make more power. some people say that the car never gets in closed loop ... it does and freescan confirms that for me as well. heat is also what kills motors and less heat over a long time will make a motor last longer ... the only down side is in the winter with that set up the heater sucks and it takes a lil bit to warm up the car.

tbag_skywalker

Those were the very first 3 mods I did to my car, and there is no chance in hell that I gained 20 rwhp from them.

160* thermostat is good for a few horsepower, and the CAI is good for a few more, but the TB coolant bypass will gain you almost nothing, just like the TB airfoil and all of the other freemods.

blackjack325

iTrader: (1)

gears and a stall.. biggest boost for the $ IMO

Mississippi

Well LPE dynoed a stock z28 before and after cai and picked up 12 at the wheels. I don't the the coolant bypass and thermostat really gave 8rwhp together. Maybe at the crank. Not at the wheels. But worthwhile mods none the less. Cooler motor is better. Cooler tb means cooler air. And that is better as well.

1SLOLTX

what gears and stall..keep in mind its gonna be my daily driver

96SilverZ

iTrader: (2)

For gears you want 3.73s and for a stall I believe 3000 but feel free to correct me on that one

Mississippi

I don't know much about stalls, but I do know a few auto fbody guys that run 373s in their dds and they do just fine. So like has been previously stated, 373s ftw.

nomoneyz

iTrader: (15)

I honestly am against the 3.73 for autos. I love 4.10s with my auto and a 3200 stall. Seriously though, start with bolt ons like I said in your other thread. Headers, y-pipe, CAI, elbow, tune, and suspension. You will think it a whole different car. Trust me if you just throw a stall and gears in there your going to get beat every time cause your going to spin the tires as soon as you gun it. Start with the basics to get a good foundation.