Puller size with intercooler and belt size question

dkaar · 07-02-2009, 10:43 AM

I have a Vortech V1 and am going to add an A/A fmic. I currently have the stock 3.6" pulley and push 10 - 10.5 lbs of boost. Question is, what size pulley should I go with to get the approximate same amount of boost. I have read 3.125 and 3.33. On Ebay, there is a seller who custom makes them and has a 3.2 as well. Next question, is there a need to get a smaller belt or will the automatic tensioner be suffice for the situation. Will belt slippage be an issue and will I be putting my V1 out of it's efficency range with the smaller pulley?

This ad is not displayed to registered or logged-in members.
Register your free account today and become a member on Mustang Forums!

luckythirteen13 · 07-02-2009, 01:36 PM

how much hp are you trying to add? the IC alone should be good for about 50hp. the rule of thumb when doing pulley swaps is you get 1-2psi gain for every size smaller you go. if you look at vortech's website they will have all the sizes listed so you can see how many steps your taking.

as far as the tensioner goes, depends on how tight the belt is now. if the tensioner is maxed out now(pulled all the way back), when you go to a smaller there may be enough swing left int he tensioner to let you keep the belt you have now. also depends on how small of a pulley you put. best thing to do is just have a belt about 1" shorter ready incase you need it. if you dont just return it

dkaar · 07-02-2009, 06:39 PM

Thanks for the reply. I want to be at about 415, so about 50 hp more. You are saying the IC is good for about 50, but is that with the pressure loss that will incur, or if I swap pulleys to stay at the same psi I am at now?

Frostbitten · 07-02-2009, 07:07 PM

with my old setup I had a vortech v1 with the 3.60 pulley it made a max of 8psi and 350whp. It had exhaust and a powerpipe with supporting mods. I dont know how your getting 10psi out of that pulley. But later I added a paxton a/a intercooler with a 3.33 pulley and it made 10psi and 430whp. So that may help.

dkaar · 07-02-2009, 09:14 PM

Well, I have the 4" anderson power pipe, 90mm MAF, a HUGE filter, and a 78mm throttle body. All those really helped getting to 10 psi.

luckythirteen13 · 07-03-2009, 12:49 PM

if all you want is another 50hp id just do the IC.

as far as pressure drop goes, who cares. boost pressure is nothing more then a measure of the restriction between the tb and the sc. even if your boost pressure dropped 5psi after the ic, the sc is still putting out the same volume of air therefor you arent loosing any power. the i/c doesnt magically eat up boost air, your not loosing any air volume and thats all that matters

dkaar · 07-03-2009, 06:50 PM

I suppose doing all this will be I will have to get a blowthru MAF. The money really starts jumping up there when you add in a BOV and a blowthru.

luckythirteen13 · 07-03-2009, 08:33 PM

not necessarily. you can stick with the same draw through and bypass valve setup you have now

dkaar · 07-04-2009, 10:18 AM

I have read the Lightning MAF maxes out around 400 hp, is that true?

Frostbitten · 07-04-2009, 03:26 PM

Quote:

Originally Posted by dkaar

I have read the Lightning MAF maxes out around 400 hp, is that true?

Mine did right at 400whp. They told me I needed a Mafia to get it fixed, but I just went ahead and got an SCT BA2800 instead and it works great