I believe that the smallest s/c pulley is a 2.87 and that gices about 13psi, with a raised redline to 7200 what boost level would that yield? And at the same time would that over spin the V2 causing damage? Thank you smart peoples

 

-also are there smaller pulleysto be bought?
-My last question is iwhat is the name of tht gismo that prevents detonation, im not talking about IC or water injection, but the thing that senses if something goes wrong and prevents damage, i know thats kind of vague but its the best i can do.

again any input is appreciated.

 

I'm sure that there are smaller pulleys out there... if not, you can get custom pulleys...

You're talkin' about the knock sensor, I think...

 

J&S Ultrasafeguard

 

thaks alot man

 

but won't they overspin the blower causing damage? thanks

 

Do after market ECU's do taht as well, such as JWT ecu? Does http://www.jandssafeguard.com/ increase performance? I'm asking because i see that you can adjust your RPM setting with that and that it plays with the timing on its own. thank ya

 

J&S only pulls back timing and/or timing when you squeeze NOS... It can pull timing back per 2 cylinders (due to wasted spark setup) instead of all the cylinders. It only pulls as much timing as necessary until it stops then restores it when safe. It's mostly an "insurance" devices unless your engine is retarding the timimg massively due to pinging/detonation (which is bad).

 

It is possible to over-spin the blower, yes. There's a calculator you can use on Vortech's website that will calculate the blower RPM based on pulley diameter, crankshaft pulley diameter and engine RPM. You can also find out what the maximum RPM the V2 blower will take. http://www.vortechsuperchargers.com/...pspeedv-2.html

Use these to determine what you want to do.

I would stick with the 3.125" pulley myself... going with the 2.87" will possibly be too much for a stock Maxima... I ran the 3.125" and measured 10.6 psi at the manifold - which probably translates to a little more than 11psi from the blower..

 

There is a 2.6" Pulley - and that should give you 13PSI. The 2.87" gives about 11.5-12PSI on a stock rev-limiter. Some people have scored more, some less - but I attribute that to gauge calibration more than anything. 11.5-12 seems to be the average from what I've seen.

I am running a 2.87" Pulley right now with an extended redline and am getting about 13PSI of boost with that raised redline.

I am overspinning the blower like crazy, but so far it seems to not have a problem with that. Even Vortech has admitted that the 50k spin limit is a safety variable, and the blower can easily survive more than that for short bursts.

1-step colder plugs and 370cc Injectors.
(Although I've never heard/seen any detonation, I did buy some 2-step colder plugs today just in case)

IanS

 

Yeah, overspinning the blower would probably only be a problem if you held the pedal to the floor and just let the car sit at redline for an hour or so....

Hitting the redline real quick and backing off probably isn't going to cause any harm when it overspins the blower...

 

thank you for the input guys, you all have been very helpful

 

Have you been to the track?

 

I belive Ilumo had something like a 2.67 but his was a V1