Jackson Racing Supercharger Owners Thread

[Deep Six]

Originally Posted by CSG Mike

It is! I'd recommend a 6500 RPM redline with it on a C30.

Point of clarification: Same belt is specified for use with 110/100/90 pulleys?


I assume the included bracket positions the head unit slightly lower to maintain the same tension with the smaller pulley?

[SpectreRT]

Originally Posted by CSG Mike

http://counterspacegarage.com/produc...r-rs-gt86.html

Sorry if I missed it, what is the maximum expected PSI with this pulley?

[CSG Mike]

Originally Posted by SpectreRT

Sorry if I missed it, what is the maximum expected PSI with this pulley?

It depends on your setup. A built engine is mandatory unless you have a highly unusual need.

[ExpertZero]

any updates on this ? jw

Originally Posted by mrg666

I still hear boost is released at idle and when accelerator is released. But it sounds and feels a more gradual (not sudden) boost release. The engine feels smoother to me. Would you be interested checking this out over there?
I think this is what you are pointing out. I am quoting from the Rotrex manual:
"If you choose to position the throttle body downstream, a re-circulation valve is
recommended. If the valve is omitted the supercharger will create noise under deceleration caused by surge.
Surge occurs when the supercharger keeps making pressure at low airflow forcing the compressor to work
outside the intended operation area. This will be most noticeable on high boost applications under high
engine rpm with the throttle closed (deceleration). The re-circulation valve will prevent surge by allowing air
to circulate from the pressure side of the supercharger to the inlet side of the supercharger under manifold
vacuum conditions."

The supercharger was making more noise under sudden deceleration with the stock valve.

[mrg666]

Originally Posted by ExpertZero

any updates on this ? jw

I am still using the stiffest spring (yellow) in the recirculation valve.

- With the stiff spring, recirculation valve closes earlier at lower vacuum level when I want to accelerate. This boosts the engine at lower rpm, gives better throttle response, and noticeably higher power at lower rpm.
- Recirculation valve opens later (at higher vacuum) when I release throttle in deceleration. I feel that the compressor is making less noise on sudden release of throttle. Take this with a grain of salt since this is my interpretation: I think the surge is less on the compressor during deceleration and compressor is happier.

I went back to softer spring for a day to make sure this is not all placebo. Nope, I have installed the stiffest spring back and I am definitely not making all these up.

CSGMike said that he is going to test what I posted here. But it is not an expensive piece to test if you want to see yourself. I think RKX valve is higher quality than the plastic valve anyway.

[keithr]

Originally Posted by mrg666

I am still using the stiffest spring (yellow) in the recirculation valve.

- With the stiff spring, recirculation valve closes earlier at lower vacuum level when I want to accelerate. This boosts the engine at lower rpm, gives better throttle response, and noticeably higher power at lower rpm.
- Recirculation valve opens later (at higher vacuum) when I release throttle in deceleration. I feel that the compressor is making less noise on sudden release of throttle. Take this with a grain of salt since this is my interpretation: I think the surge is less on the compressor during deceleration and compressor is happier.

I went back to softer spring for a day to make sure this is not all placebo. Nope, I have installed the stiffest spring back and I am definitely not making all these up.

CSGMike said that he is going to test what I posted here. But it is not an expensive piece to test if you want to see yourself. I think RKX valve is higher quality than the plastic valve anyway.

I’m curious to hear not only what Mike has to say but also if the JR folks have thoughts on this.

[mrg666]

Originally Posted by keithr

I’m curious to hear not only what Mike has to say but also if the JR folks have thoughts on this.

Me too. I don't know a nearby tuning shop to go for a dyno test. Anybody knows one in the Capital District?

[RFB]

Originally Posted by CSG Mike

It depends on your setup. A built engine is mandatory unless you have a highly unusual need.

JRSC at max boost, high boost pulley, built engine, what compression ratio pistons would you recommend ?

[SPCorBUST]

Originally Posted by RFB

JRSC at max boost, high boost pulley, built engine, what compression ratio pistons would you recommend ?

12.5, but I might be biased.

Sent from my SM-G925T using Tapatalk

[CSG Mike]

Originally Posted by RFB

JRSC at max boost, high boost pulley, built engine, what compression ratio pistons would you recommend ?

Short answer: the highest your fuel will allow


Long answer: It depends. How much other work are you doing to your "built engine"? Rods and pistons do not really check the boxes for me for a "built engine".

[ExpertZero]

Originally Posted by CSG Mike

Hmmm interesting.

Can you PM me links to everything you're using?

I'm curious to try.

By any chance, did you purchase the bpv & tested it? jw

[RFB]

Originally Posted by CSG Mike

Short answer: the highest your fuel will allow


Long answer: It depends. How much other work are you doing to your "built engine"? Rods and pistons do not really check the boxes for me for a "built engine".

"Built engine"
- new cp rods, manley pistons or similar, new bearings, new crank shaft, machined and assembled heads hot tank, crack checked, decked, new valve seals, custom angle seat and grind, ferrea intake and exhaust valve, dual valve springs, titanium retainers.
High flow fuel pump 1000c.c. injectors.
Jackson supercharger, hi-boost pulley-

Which compression ratio would you recommend for max h.p. and max reliability?

[CSG Mike]

Originally Posted by RFB

"Built engine"
- new cp rods, manley pistons or similar, new bearings, new crank shaft, machined and assembled heads hot tank, crack checked, decked, new valve seals, custom angle seat and grind, ferrea intake and exhaust valve, dual valve springs, titanium retainers.
High flow fuel pump 1000c.c. injectors.
Jackson supercharger, hi-boost pulley-

Which compression ratio would you recommend for max h.p. and max reliability?

What fuel will you be using?

I recommend going as high as you can. Your question is best answered by your tuner and engine builder. In my case, I can run full time E85 with E98 and Q116 available to me readily. I would run 13.5+.

[RFB]

Originally Posted by CSG Mike

What fuel will you be using?

I recommend going as high as you can.

How high with 94 ?