Jackson Racing Rotrex Supercharger System Info and Discussion

[*LongFella]

Originally Posted by CSG Mike

If it changes so little that you can bolt-on and use, then it also means that it changes the parameters so little, that it effectively is equivalent to the stock header.

Remember, we have a MAF based car that works off of volumetric efficiency tables. Volumetric efficiency changes if flow significantly changes, which is what throws off the tune.

It's a love/hate relationship Mike.... Damn your knowledge and brain power! LOL!

[Superstar]

Originally Posted by CSG Mike

If it changes so little that you can bolt-on and use, then it also means that it changes the parameters so little, that it effectively is equivalent to the stock header.

Remember, we have a MAF based car that works off of volumetric efficiency tables. Volumetric efficiency changes if flow significantly changes, which is what throws off the tune.

How does Honda MAF work? Never seem to have this issue with slapping on an intake for a Honda...

[CSG Mike]

Originally Posted by Superstar

How does Honda MAF work? Never seem to have this issue with slapping on an intake for a Honda...

On what car? The S2000 uses MAP, not MAF. The K can use MAP, MAF, or a hybrid.

Also, that intake is probably not *really* doing anything

[sklimo]

Today is going to be the longest day in the history of the world. I pick my baby up tomorrow!!!

[mad_sb]

Originally Posted by CSG Mike

I understand what you're saying. You want to ramp up the boost faster, and then restrict it, so that peak output isn't dramatically increased. What I'm saying is that there's only about 10% overhead left, so you can ramp up the boost 10% faster and still stay within the Rotrex's manufacturer's specifications.

Gotcha,

After digging some more it looks like using a restricter is not as clean a solution as i thought.. meaning the boost does not just level off and hold but rather will drop (in some cases like a rock) off sharply.. so you end up making peak power at lower rpm... not an appealing idea to me. I guess the "best" way to get more boost down low and maintain it at a safe level up top is with a gated setup.

[CSG Mike]

Originally Posted by mad_sb

Gotcha,

After digging some more it looks like using a restricter is not as clean a solution as i thought.. meaning the boost does not just level off and hold but rather will drop (in some cases like a rock) off sharply.. so you end up making peak power at lower rpm... not an appealing idea to me. I guess the "best" way to get more boost down low and maintain it at a safe level up top is with a gated setup.

Part of that is because the restrictor itself works as a velocity stack. A restrictor will actually *increase* power at a certain combination of flow and RPM, but ultimately limit power further up the powerband.

Check out the huge spike in power WRC cars have, and then the heavy nosedive as they go up the RPM range. The restrictor is to blame for that type of curve.

[ramiram1984]

I'm excited to see other's numbers and feedback once installed.

[sklimo]

I'll post my feedback and numbers tomorrow or Wednesday

[sklimo]

@Prime Motoring sent me a teaser pic!!!!! Figure I'd share

[kurbkilla]

Not sure if this is in the right topic. If I went with the Jackson CARB tune and then added a JDL header, will I get a check engine light? Would I have to buy two tune's? One for the stock header and one for the aftermarket header?

[*LongFella]

Originally Posted by kurbkilla

Not sure if this is in the right topic. If I went with the Jackson CARB tune and then added a JDL header, will I get a check engine light? Would I have to buy two tune's? One for the stock header and one for the aftermarket header?

I asked a similar question. I was looking at the new ft86speedfactory catted UEL they are working on...

Simple answer - yes on a new tune. Not sure about the CEL though...

It would be best to get a tune that works and utilizes the header you add on... at least from what I gathered :-)

[CSG Mike]

Originally Posted by kurbkilla

Not sure if this is in the right topic. If I went with the Jackson CARB tune and then added a JDL header, will I get a check engine light? Would I have to buy two tune's? One for the stock header and one for the aftermarket header?

CEL depends on the header.

If you're going to do breathing/exhaust mods, I'd recommend you do ALL the mods simultaneously, so that you don't have to constantly keep retuning.

[kurbkilla]

Originally Posted by CSG Mike

CEL depends on the header.

If you're going to do breathing/exhaust mods, I'd recommend you do ALL the mods simultaneously, so that you don't have to constantly keep retuning.

I was looking at doing a header-back then then other mods. The very last being headers and supercharger. I would like to have the option of putting the stock header and front pipe on, and off. If I do that would I need two tunes.

Yes this is so I can smog the car anywhere I want.

[CSG Mike]

Originally Posted by kurbkilla

I was looking at doing a header-back then then other mods. The very last being headers and supercharger. I would like to have the option of putting the stock header and front pipe on, and off. If I do that would I need two tunes.

Yes this is so I can smog the car anywhere I want.

Ah, sounds like keeping the CARB tune for smog, and the other tune for "other times" will be perfect for you