Supercharger, What's the difference between 5, 7 or 8 PSI pulley?

[Cudaman]

Re: Supercharger, What\'s the difference between 5, 7 or 8 PSI pulley?

Tim, pistons themselves are around $1,000, but the labor to install them is significant unless you do it yourself. The other big question is how much boost you plan to run, and whether you think you'll be happy with a basic 5-7 psi system. You could just replace the pistons and keep the costs down, but if you think you may want to crank up the boost later, while you're in there you probably should upgrade the lifters and add roller rockers and stronger pushrods as well. It would also make a lot of sense to have your heads ported (or swap them out for a ported set), and consider a cam change. And yes, any or all of the above can be done with the engine in the car by someone who is careful and knows what they're doing, although most tuners won't do it that way as they prefer to have the block bored etc.

As far as anything that changed for the worse in 2001 from a blower perspective (actually it was in 2000), the pistons are the only thing.

I think if you investigate most after market forged pistons they are NOT stock bore, they are 10,20 or 30 over. Unless you can squeeze than slightly are piston in that smaller hole, it will not work. The other reason why most respected tuners will not use the stock bore is they will clean up the cylinder bore by re cutting or cleaning the cylinder, vs honing the bore. A job done is worth doing correctly the first time vs doing twice and spending way more money.

Cudaman

 

[RedGTS]

Re: Supercharger, What\'s the difference between 5, 7 or 8 PSI pulley?

Cuda, forged pistons are available in the stock 4" bore size. I just bought some through Arrow. If you're going to pull the motor and bore it, you might as well do .030 over and gain a little displacement, which is what most tuners do. And while doing an in-frame replacement may not be the best route for everyone, I would dispute that doing it that way is not "right" for anyone, as would Arrow. There is no reason an engine with less than 10k miles and clean bores would not be fine with a honing job if it's done properly.

 

[Cudaman]

Re: Supercharger, What\'s the difference between 5, 7 or 8 PSI pulley?

Ronnie sounds like you have done your homework and are doing it correct way with a low mileage motor. Are you going to inspect the cylinder walls before ordering the stock forged pistons? Hopefully you have no scoring of the cylinder walls with the loss of part of the piston. When you are completed you will have the best of both worlds.....(X creampuff)....ABS with forgers.

Cudaman

 

[RedGTS]

Re: Supercharger, What\'s the difference between 5, 7 or 8 PSI pulley?

Ward, yes we looked at the cylinder walls closely and of course were going to pull the engine if there was any damage. Oddly enough, there was no sign of anything in the cylinder, the head, or anywhere else in the motor--the only thing we found was that the 4 electrodes on one plug (presumably the one from that cylinder but we had pulled them before finding the piston issue so we don't know for sure) were pushed in slightly. Apparently that piece broke off, hit the plug, and went straight out the exhaust port. Might have broken up into tiny pieces in the process. I'm looking forward to joining the ranks of the X-puffs!

BTW, congrats on your showing in Kansas--you're always consistently fast. And I hope 2Many didn't get you into too much trouble--gotta keep an eye on him!

 

[proracer1]

Re: Supercharger, What\'s the difference between 5, 7 or 8 PSI pulley?

Sean-Thanks for the input. If I were to go 10lbs for the track how much tuning would I need to do with the Vec-2?

 

[HARDVIPER]

Re: Supercharger, What\'s the difference between 5, 7 or 8 PSI pulley?

Hey guy's, you know I'm a newbie, so this question won't be lame.
What is a creampuff and what makes an X creampuff?

 

[RedGTS]

Re: Supercharger, What\'s the difference between 5, 7 or 8 PSI pulley?

Hey guy's, you know I'm a newbie, so this question won't be lame.
What is a creampuff and what makes an X creampuff?

The 2000 and up cars have cast pistons rather than forged and a slightly less aggressive cam, hence the creampuff tag. An X-creampuff is simply a 2000 up car that has had forged pistons and possibly a new cam installed.

 

[Sean Roe]

Re: Supercharger, What\'s the difference between 5, 7 or 8 PSI pulley?

Sean-Thanks for the input. If I were to go 10lbs for the track how much tuning would I need to do with the Vec-2?

Slide in a new program card (I have some new programs we've put together that are mapped through 12 PSI). Then, verify the A/F ratio is correct and do a plug check (or listen for any pinging with a set of headphones and a clip on mic at the block). Adjust programming if necessary. Dyno test if time is available.

Regards,
Sean