rhouck

Would you mind clarifying the math behind the need to lower the max RPMs in order to achieve greater than 11 psi? Max impeller speed is 90,000 rpm for the c38. My understanding of the calculation is:

(crank pulley)/(supercharger pulley) * (drive ratio) * (max RPM) = (impeller speed)

That should put us at:

(crank pulley)/(85mm) * (7.5) * (8200) = (impeller speed)

I thought the crank pulley was 130mm which would make it 94,000 RPM, which is about right for nearing the max. But so that is really only producing 11 psi? Does Kraftwerks use a crank pulley which is smaller than 130mm?

If there is no way to increase boost without dropping the redline below 8200 (or overspinning the blower), then personally I would consider this setup "maxed out" right out of the box.

I wonder what TTS is using on its full race kit to hit 18 psi... looks like they use a 125mm crank pulley, but unsure what size supercharger pulley that is mated with.

kueda

Excelerate Performance, your efforts are appreciated, it's KW issues with providing inadequate information upon release of there product I am frustrated about.

Does the base kit include injectors and a fuel pump? From the picture is appears to. Do you know what size of injectors and pump is provided?


I am most interested in a kit that will produce 14-16psi. I guess I will wait until pulley upgrade information in released.

s2kseven

"Do you have pictures of the bracket used to mount the c38? (and/or a source for that bracket) "

This bracket is for C30-94 - is the C38 identical ?
http://imageshack.us/a/img442/4470/may172010047.jpg

johnzal

Was this kit dynoed at church?.;-).

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Excelerate Performance

Ok so here's some more info on the pulley setup.

Supercharger kit Blower Upper pulley Kit redline RPM Max redline (blower) Boost Pulley change / max rpm
S2000 AP1 00-03 C38-81 80mm -T 9150 9600 11.2 75mm pulley - 9000rpm // 70mm pulley -8200rpm
S2000 AP1 04-05 C38-81 70mm -T 8200 8400 11.2 67mm pulley -8100rpm
S2000 AP2 06-09 C38-81 70mm -T 8200 8400 11.2 67mm pulley -8100rpm

rhouck

Thanks for this. Do you know if they are basing "Max redline (blower)" off the max rated impeller speed of 90,000 rpm, or if they are leaving an additional margin of safety?

When I run the numbers, it seems to be off a 100mm crank pulley (assuming a 90,000 max impeller speed). That means either the crank pulley they use to spin it is smaller than stock (possible), or they are leaving a margin for safety above the manufacturer's rating.

RAIN H8R

Good stats. Now we need to know the crank pulley diameter as well as what the pulleys listed are spining the blows to(rpm).

Are the pulley sizes listed the only pulleys available? If there are more we want to see a spread sheet with the available pulley sizes listed, with a blower rpm speed, next to engine rpm.


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kueda

+1

I am interested to know what the 75mm pulley is expected to make for boost.

Also can we please get a parts breakdown of what is include in the base kit.

I would like to know if injectors and fuel pump are included. If so what flow rates they are.

Thankyou

RAIN H8R

Ive been doing alot of research on this kit as well as the TTS kit. Which has made me start to think that the c38-81 may provide the power levels I am looking for.

Excelerate performance, is it possible to find out the crank pulley diameter of the KW kit? I want to do the math and find out what rpm the engine is spinning at, because that will tell me how much power I can potentially make. It is possible get a photo of all the components for the kit? Specifically I want a photo of the crank pulley.

You have provided alot of information so far and we are all greatful for that. Realistically, how many more weeks until the kits are ready for shipment?

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deltav

The c38-81 is not more efficient than the c38-91. straight comparison will see the 38-91 make around peak 1-1.5 psi more than a -81 with no real temperature difference.