Hello!
I am going to order my new SC pretty soon. I would like to know that what size of the pulley I should use. I have 98 Auto upgrade with most thing except DON VB mod, I had Transmisiion cooler and oil coller installed already. I don't want to push my car too hard and I want to use it last long with SC. What else that I should upgrade for my car and what size of pulley I should use? Oh! Is there any problem that I can expect to have after installing SC ?

 

stock pulley 6psi, I believe 3.33 up to 8psi 3.25 pulley up to 10PSI
just order some metal ASP pulleys and a BOV and youll be alright

 

Quote:

Oh! Is there any problem that I can expect to have after installing SC ?

oh yea~ several for my install. Glad my installer helps me out a lot. Make sure you have extra time for trouble shootings.


you can go with smaller pulleys like 3.25, 3.125 and adjust your boost with the BOV.

 

Curious?? Adjust your boost w/ your BOV??? loosening the BOV so it leaks boost? Isn't that pointless of getting a smaller pulley?

 

Although you can run without the VB mod you should get it soon.

 

of course you dont want to start with a peak boost of 13 psi. so you can start with a small pulley loose the bov to 9 psi. Once you are sure that your car is ready for more...all you have to do is tighten the BOV a little bit more.

not pointless at all...unless you love to do pulley swap.

 

Understandable... I've just NEVER heard of that approach before.
If you have a pull type BOV like HKS SSQ, and Apex twin chamer, I don't think loosening it will make a difference. My BOV are heard at 4psi and their really heard at 15. So your method wouldn't really work w/ certain BOV's Even on the loosest setting, my HKS will still hold over 15 psi. BTW, I have HKS SSQ's

 

You want the 2.87

 

you are right and it only works for certain BOV.

It took a lot of time to change the pulley and Y2KevSE decided to use a small pulley so I can play around with the amount of boost. With a small pulley, you boost faster and earlier. I dunno if my car is ready to handle more thatn 10psi.

there is a amount that you can let go. I wont try to aim for 6 psi with a 2.87 (default 13psi).

one of the downsides is our V2 s-trim can only handle certain pulleys. V2's max impeller speed is 50,000 rpm. I think 2.87 is already passing its limit after 5000 engine rpm.

btw, I have a simple BOV, greddy.

 

What about the V1? Can it spin faster? Is it built stronger?

 

the 2.87 at 6200 rpms, it's just over the writen limit...but it does handle it just fine. The v1 is teh same way...You really want boost upgrade teh blower to the SQE trim it has a 62000rpm impeller limit.

 

Keep in mind that whatever you do, the smaller pulley you run, the faster you will wear out the blower.

 

help me do this

please

 

Switch it to the HKS.. Did mines last weeks.. Sounds a lott better then the Blitz. You still have that one right?

 

the limit for the blower is 50k. I think with our crank pulley diameter, it passes the limit at 5000 engine rpm IIRC. I lost the link to the thread.

so how much does it cost to upgrade the blower to SQE trim?


Craig : v1 and v2 s-trim both have the same limit, 50k. I agree with you....smaller pulley means adding more work to the blower.


GoldenGlory : ?? you want me to change your pulleys?

 

Limit is 50k, absolute limit is 53k, and it only hit that just about at shift.http://www.vortechsuperchargers.com/...rformance.html

Check the numbers.

 

thx

do you have the diameter of our crank pulley?

I remembered that I use this
http://www.vortechsuperchargers.com/...pspeedv-2.html
to calculate the impeller speed. It maxed out at 5300 engine rpm.

 

6.25 in the iner diameter that matters. And the 2.87 clearly works I have it , kev had it, and others have it.

 

I think I got a right crank diameter somewhere and the calculation was wrong.


thx~

 

crank pulley of6.25 inner and or 6.5 outter

shift point of 6200-6300

supercharger pulley of 2.87
impeller speed at the outside is
50690.-- within the 53000 maximum limit.

 

Sometimes the auto doesn't shift that early.

 

sorry~ I meant I got a wrong diameter from somebody

 

Mine does It always shifts exactly when it should.