ok, i want to put a smaller pulley on my bonne with plug, cai ...

but... my car is still under warranty for 1 year, engine and drivetrain (what is in oil)
i heard that with a 3.5, it look pretty like factory, and i keep the same belt,is it right?

so, its cheaper because i dont need a new belt, and the dealer will probably never see the difference. seem to be a better choice, but

do a 3.4 pulley will make a huge difference over the 3.5, or it doesnt worth the extra$$
considering my warranty too?

my goal is to get like 14.5 on quarter all day long without removing everything in my car.

any advice could really help me out :?

I'm running a 3.4 with the stock belt, no problem. I can't imagine much performance difference between the 3.4 and the 3.5, but I'm not too sure. Maybe a 5HP difference. Also, you may want to consider changing your thermostat to a 180 degree to help with the extra heat the smaller pulley will generate.

As far as warranty, I'm not sure if those mods will void the warranty or not. I bought an extended warranty with my car and have no idea if I have voided it with what I have done. Some people have told me, if I need warranty work, to swap back in the stock airbox before taking it in. The plugs, thermostat and pulley would most likely go unnoticed. But I'm sure I'd be taking my chances (assuming it was an engine problem).

Hope this helps.

i dont think anyone would notice as long as the belt doent need to be a smaller size.. i know for sure that when i was a tech at the local chevy dealer i wouldnt notice something like that... They all look the same unless there is something obvious like an intake or exhaust...

If you ever take your car in for warranty work, put the stock pulley back on. If it'* some serious work they're doing thats engine or powertrain related, they'll measure that pulley.

[quote="00indyssei"]I'm running a 3.4 with the stock belt, no problem.

so you use a 3.4 without any belt slipping? the belt get enought tension?
ill go for it if i can be sure it will fit with the stock belt.

and when u get 14.8 ,what was your 60 ' and the max speed u get?

for the info

If you don't have any other mods, you will gain more from a 3.5 pulley than you will a 3.4 because the 3.4 creates too much boost, meaning a lot of heat, causing knock retard, casuing you to go slower. On a pretty much stock car a 3.5 is the way to go.

Some GP GTX'* actually got 3.5 pulleys installed stock from the factory. I highly doubt they'll worry much about the pulley if its a 3.5. However, if you are getting major drivetrain work done like a tranny or something in the bottom end of the engine broken then you might want to take it off. They have to be able to prove that the modification you did is what caused the drivetrain problem to void the warranty, so if your water pump goes bad they can't say they won't replace it because you have a smaller pulley, because it obviously didn't effect that.

Shawn

For you warranty purposes have you considered running a modular set up?so you can switch back to the factor pulley anytime you want?

That wouldn't really help because I think there is only 1 modular pulely system that even has a stock size pulley available IIRC. I think DUB is the only one. However it costs a lot more money (about twice as much as a press on) and on the small chance that he might have to get warranty work done they won't notice the 3.5, and if they do it has to be something that the pulley could've caused for them to not warranty it. Just my $.02.

Shawn

I am using the stock belt and have had no problems. I agree that if you decide to run a 3.4, I would definately have a CAI, colder copper plugs and at least a 180 thermostat in to help control the extra heat generated otherwise you'll run into a lot of KR.

Here'* my timeslip after all the mods in my sig (left lane, car 113 - right lane was a modified Z28 4th generation):

i got my intake gasket done 2 week ago, and the boost control solenoid too, i have also the pressure solenoid in the tranny in way to be replace before any mod,(got the 1811 code for the tranny-shift hard sometime- )

after that i will probably be ok(for major problem) for a while, and i will for sure add a CAI
(already done, just wait for the pulley to install it) colder plugs and thermostat.

it seem to work fine for u 00indyssei with that setup, so thats what ill do, 3.4 with stock
belt, if it fit perfectly with the stock belt.?!

you seem to put good time with a 3.4, even with a wheels spin, at 15.296 i did 2.329
for 60 feet, and 9.828 for 1/8 ,you gain half a second on me.

cant wait to mod her!