Kraftwerks Rotrex Supercharger Discussion

[digital_assassin]

It would have been nice to see a 91 octane pull with exhaust but it seems Kraftwerks has moved past it and is only testing on E85. I'm on the fence whether to go E85 or not. There's a handful of stations in my area that have it but I don't know what the quality is and thus whether I would need to do the Flex Fuel kit.

[Calum]

Originally Posted by fenton

Am I right in saying that when you shift you go from 350whp down to 200?

Sent from my HTC One using Tapatalk 4

Yup, that seems about right. It would be exilerating to the butt dyno, but I wouldn't be surprised if you sc is doing better below that point.

[fenton]

Originally Posted by Calum

Yup, that seems about right. It would be exilerating to the butt dyno, but I wouldn't be surprised if you sc is doing better below that point.

It would feel crazy. Double the HP in 2000rpm almost.

Sent from my HTC One using Tapatalk 4

[xwd]

Originally Posted by RaLo

This kit is looking like a winner... if it can hit ~300hp with headers and header-back exhaust, and on cali-91oct (don't care about e85 vanity-numbers for a DD), I'm sold...

300whp or 300 flywheel hp? 300whp is not going to happen with this (or any other) kit on 91 octane gas without meth injection, it's just terrible gas.

The newer dyno at 338 is using s smaller pulley, more boost, and E85.

[FreshFRS]

Originally Posted by Adeets

@industrial To achieve 13psi on that blower on our car at 7400RPM they have to spin it to 110,000RPM, isn't that over the 100,000 RPM Limit? (ambient temp 75F, Intake temp @ 125F@13psi = .253 kg/sec with a 2.16 pressure ratio.) This also drops you into the 60-65% rating which increases intake temps.

Doesn't seem that different from the vortech the more that is released.

LOL just compared to the vortech graph, .253 kg/s = 33.5Lbs/min with a 2.16 pressure ratio, sticks the vortech at 50k (right at RPM limit.) and in its 70% efficiency rating = lower IATs... so from what we've learned about the vortech is that 50k = 3" pully...

So there are differences between the two.

looking at the compressor map on the rotrex site .253kg/s at 2.16 would be spinning about 89k and be in the 68-70 thermal efficiency range at that PR the vortech is slightly more efficient, but you don't have to overspeed it to achieve 13psi. click on the c30 tech data http://www.rotrex.com/Home/Technolog...Technical_Data

[RaLo]

Originally Posted by dwx

300whp or 300 flywheel hp? 300whp is not going to happen with this (or any other) kit on 91 octane gas without meth injection, it's just terrible gas.

The newer dyno at 338 is using s smaller pulley, more boost, and E85.

We'll say 300 flywheel just to keep high-hopes in check, but this kit should be able to atleast hit 280hp to the wheels on 91oct in the hands of a proper tuner, who happens to be less than a 20min drive from home to Danville

[Freeman]

Originally Posted by RaLo

We'll say 300 flywheel just to keep high-hopes in check, but this kit should be able to atleast hit 280hp to the wheels on 91oct in the hands of a proper tuner, who happens to be less than a 20min drive from home to Danville

Should be do-able. The dyno above hit what looks like 239hp with stock headers and exhaust on 91.

sent from my locker... help!

[digital_assassin]

I'm banking on @Drift-Office to do some proper Voodoo for me when my kit comes in.

[grostoine]

Did I just saw Skunk2 is doing a header for the brz ???

[Turbowned]

I just wanna see 93 octane dynos.

You know, for the majority of the U.S. that doesn't have to deal with crappy 91 swill and can't easily get corn juice.

[DJCarbine]

Originally Posted by elopez

for all the vortech owners. kraftwerks has placed the challenge on the table. stop hypothesizing about compressor maps, rpms, and thermal efficiency between these 2 kits.

put your kit where your mouth is and go head-to-head w/rotrex. put this debate to rest with real results, not a bunch of "hot air".

We can't, the rotrex kit isn't out yet and all of our supercharger belts have snapped.

Also see above post

[Sportsguy83]

Originally Posted by DJCarbine

FWIW the dyno with near 300whp is with E85 unless I am missing something

The near 300 whp run was with 93 pumpgas.

http://www.ft86club.com/forums/showthread.php?t=41285

[Sportsguy83]

Originally Posted by Adeets

I think he was talking about the kraftworx getting to 285 on e85, what you posted was the vortech hitting that mark on 93octane

Oops! @DJCarbine I thought you were talking about the Vortech kit.. My apologies

[DJCarbine]

Originally Posted by Sportsguy83

Oops! @DJCarbine I thought you were talking about the Vortech kit.. My apologies