This question is for anyone with a Saleen Supercharger. Did anyone mess up their stop bolt? I'm not sure I paid close enough attention when i removed it. Did anyone else have this issue? How does the stop bolt work ? Any information is appreciated thanks.

 

Stop bolt?............

I am unsure what you mean

are you talking about the screw/bolt on the boost bypass valve?...
(if so... you REMOVED it??....)

 

Yes the stop bolt it was bolt that stops the plunger connected to the pump that connects to the rod in the supercharger in the back. Saleen instructions call that bolt with the nut a stop bolt

Ok here was the deal.

I was only getting 5 psi for some reason. We just spent the last 6 hours working on the supercharger on a dyno. It turns out my stop bolt was to long. With the stop bolt screwed down all the way, till it would move no more only got me 4 psi. When we took the bolt all the way out we got 8 psi. We ended up cutting the stop bolt down then installing, with a little tweaking, I got 10 PSI. Now the messed up part is we didn't touch the stop bolt until 5 hours and 30 minutes into taking everything apart putting stuff back together. I couldn't re-dyno the car for #'s since I left my SCT with the dyno tune at home.

 

I am confused - that screw is supposed to control how soon your boost comes in, not what your total boost output is supposed to be as far as I know. (What size pulley are you running?)

I have heard that if you tighten the screw (bringing it IN toward the SC) your boost comes on sooner.

With the unit ON the car, how did you loosen/get at that bolt? I have thought about running it in a bit but couldn't find a way at that time to screw it in (because of the angle and the firewall)

 

I spoke to saleen about that bolt and from what Tech support said is that does in fact control how much boost your getting. He stated that bolt is installed during the build of the supercharger. I just used a allen wrench with the car running screw it in or out. With the bolt not touching metal piece connected to the pump's plunger I got a boost of around 8-9 psi and another 1 - 2 psi when I hit 6400 RPM. When the bolt touches I get a max of 9 1/2 psi and dropping from there the more the bolt sticks out.

 

Okay - so what happened to yours then? It sounds like you got the desired reults after adjusting it.

Did you damage the bolt?

 

With the 3.4 pulley I get an avg of 8 1/2 psi when I hit the gas, if I keep holding gas it hits 9 1/2 sometimes. When we did the dyno I got the same horsepower with 8 psi that I did when the boost gauge hit 10 PSI.

On my way to work this morning I decided to do a test. I had swapped the bolts that needed an allen wrench with square bolts on the supercharger to make adjusting this stuff easier. First I made my stop bolt touch the metal piece on the pump actuator. I lost 2 psi of boost. I then moved the stop bolt so it would not to touch the pump actuator and my boost came back. As A final test I loosened the metal bracket that holds the bypass actuator onto the supercharger and pushed it all the way down. I drove for 40 miles and my boost never went past 5psi. I pulled over and moved the bracket as far up as it would go and my boost was back to normal. It was interesting to see how much boost I lost when the bracket was moved down. The only way I can get my full boost is to have the stop bolt not touching anything and having the pump actuator's bracket pushed as far up as it can go.

Previously in this post I posted how I thought the stop bolt was the reason I wasn't getting boost. We were able to adjust the stop bolt and prove we lost boost or gained it back depending on which way the stop bolt went. When we took the supercharger apart to figure out what was causing this problem we did remove the pump actuator bracket. I guess when the pump actuator's bracket was reinstalled it was put in the correct spot. I didn't realize that the bracket also made a difference.

 

Gotcha

What size allen wrench is that stock Saleen boost bolt?