Jackson Racing C38-81 Supercharger - CARB legal

[CSG David]

Originally Posted by Bykov

Being active duty I never know where I will be sent. But when I retire I will move to Oregon where I will finally be free to do to my car as I please. So the overhead and possibilities provided by the C38 are very attractive. But I am not retired yet so I am wondering which one will be better to live with day to day. I have no problem going with a C30 then exchanging it down the road once I am retired, but it would simply be convenient if there wasn't much of a draw back of going straight to the C38. For all I know my next assignment could be Oklahoma (praying it won't be) but if it were... I could start turning things up

Depending how far out, either system will be fine for you. There are always supporting modifications that need to be addressed when the changes in setup happens, and of course, we are always there to help you achieve your goals. Whenever you're ready, don't hesitate to contact us. @Rapiddan45 will be getting his C38 setup shortly and was something that came up just in time.

Originally Posted by Rapiddan45

I will be receiving my C38 kit on Monday and do the install throughout the week. Hopefully get the tune worked out and everything with Delicious by the first weekend in February and will get it on the dyno to see what it does. Weather permitting of course. It will not be the carb tune since I have full exhaust. But hoping to have some real numbers here within 2 weeks that I can share.

Thanks for your patience. I'll forward you that tune now. LOL

[ohmai18]

Interested in thr torque and HP curves comparison as well .

[Calum]

What's the pulley size for the C30 kit, the C38 kit, and the HBP?

What's the maximum compressor RPM for the C38? And what is the maximum compressor RPM of the C38 kit while using the JRSC C38 kit's supplied pulley and running the engine at 7400 RPM?

Does the C38 kit effect the power curve vs the C30 kit?

Does the C38 kit use the same MAF housing as the C30 kit?

Why the drastic change in attitude? Before this CSG representatives have stated that the C38 would be too much for a stock engine. Now here is another kit that claims the C38 will be fine on 91 octane.

[CSG Mike]

Originally Posted by Calum

What's the pulley size for the C30 kit, the C38 kit, and the HBP?

What's the maximum compressor RPM for the C38? And what is the maximum compressor RPM of the C38 kit while using the JRSC C38 kit's supplied pulley and running the engine at 7400 RPM?

Does the C38 kit effect the power curve vs the C30 kit?

Does the C38 kit use the same MAF housing as the C30 kit?

Why the drastic change in attitude? Before this CSG representatives have stated that the C38 would be too much for a stock engine. Now here is another kit that claims the C38 will be fine on 91 octane.

- 110mm diameter for both kits, 100mm for the current HBP
- 90,000 RPM maximum, 70,636 RPM at redline with 110mm pulley
- Same power curve in CARB trim.
- Yes, same MAF
- I think we can all agree that pushing 15+ psi of boost is too much for a stock engine. At 9 psi, the stock engine is fine, regardless of compressor size.

It took nearly 3 years of testing to get here with the C38.

[ATL BRZ]

Originally Posted by CSG Mike

- I think we can all agree that pushing 15+ psi of boost is too much for a stock engine.

Yuuuuup

[Calum]

Originally Posted by CSG Mike

- 110mm diameter for both kits, 100mm for the current HBP
- 90,000 RPM maximum, 70,636 RPM at redline with 110mm pulley
- Same power curve in CARB trim.
- Yes, same MAF
- I think we can all agree that pushing 15+ psi of boost is too much for a stock engine. At 9 psi, the stock engine is fine, regardless of compressor size.

It took nearly 3 years of testing to get here with the C38.

Is the boost curve the same, or is the power curve adjusted through the tune? I find it really hard to believe that a larger compressor spinning at the same speed would result in the same boost curve.

[CSG Mike]

Originally Posted by Calum

Is the boost curve the same, or is the power curve adjusted through the tune? I find it really hard to believe that a larger compressor spinning at the same speed would result in the same boost curve.

It's not spinning at the same speed. The gear ratio of the c30-94 is a 9.49 multiplier, while the C38-81 is 7.50. The difference in compressor efficiency is small enough that it falls under the error range of most dynos.

[PandaSPUR]

I'm probably oversimplifying this, but basically theres no difference between the two kits until theres a pulley even smaller than the HBP?

I'm understanding it as, the bigger compressor will push more air, but due to the different gear ratios, will spin slower than the smaller compressor (while making the same boost). The benefit comes when an even smaller pulley is used to push the C38 to even higher RPMs, and this same smaller pulley would be unusable on the C30 because it would cause it to spin faster than it can handle.

[Jmonty]

Originally Posted by Rapiddan45

I will be receiving my C38 kit on Monday and do the install throughout the week. Hopefully get the tune worked out and everything with Delicious by the first weekend in February and will get it on the dyno to see what it does. Weather permitting of course. It will not be the carb tune since I have full exhaust. But hoping to have some real numbers here within 2 weeks that I can share.

So did your kit arrive?

[Rapiddan45]

Originally Posted by Jmonty

So did your kit arrive?

Sure did! And gotta hand it to Jackson racing, their packaging is superb. Got a good portion done tonight, hoping to have everything finished in the next few days.

[CSG Mike]

Originally Posted by PandaSPUR

I'm probably oversimplifying this, but basically theres no difference between the two kits until theres a pulley even smaller than the HBP?

I'm understanding it as, the bigger compressor will push more air, but due to the different gear ratios, will spin slower than the smaller compressor (while making the same boost). The benefit comes when an even smaller pulley is used to push the C38 to even higher RPMs, and this same smaller pulley would be unusable on the C30 because it would cause it to spin faster than it can handle.

Exactly that

[SPCorBUST]

Originally Posted by CSG Mike

Exactly that

Should we take that as a nod to a new high boost pulley being in development, given that you mentioned "current HBP"...?

Sent from my SM-G925T using Tapatalk

[CSG Mike]

Originally Posted by SPCorBUST

Should we take that as a nod to a new high boost pulley being in development, given that you mentioned "current HBP"...?

Sent from my SM-G925T using Tapatalk

[Jmonty]

my C38 blower Showed up today hope to have it together in the next day or so.