Kraftwerks Rotrex Supercharger Discussion

[Calum]

@gmsii

So. What rpm is the compressor running at.



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[gmsii]

Originally Posted by Calum

@gmsii
So. What rpm is the compressor running at.

i think a better way to phrase your question is...
what is the maximum rpm the supercharger spins and at what engine rpm

the answer would be:
we will spin the charger all the way up to its maximum speed of 100,000 rpm...what engine rpm that correlates to at this point isnt finalized because we have not decided on which pulley size we like best

[mtimney]

Originally Posted by gmsii

here is what you do.....disconnect the compressor outlet silicone hose
and the car will be NA... drive it as long and hard as you want and you will be fine

Are you sure this is safe?

[Calum]

Originally Posted by gmsii

we have not decided on which pulley size we like best

Originally Posted by gmsii

in base form it will make approx 80 more whp than stock on 91 octane fuel with stock exhaust and header

So one of these is B.S.

[pheoxs]

Originally Posted by mtimney

Are you sure this is safe?

Will be fine so long as you can slap some kind of air filter on there.

Its just a really long intake tube with a useless intercooler in the path, the MAF will still read the amount of air.

You'll just get a bit less performance and fuel economy since you're uselessly spinning a compressor and you have a ridiculously long intake tube

[djdnz]

Originally Posted by Unicorn

Dear djdnz,

Are you stating that the Vortech supercharger kit will work fine at 1C but fail miserably -1C?

Frankly this sounds ridiculous.

Yours faithfully,
Unicorn

http://www.ft86club.com/forums/showp...&postcount=339

I have another question - to clean/replace the air filter does the bumper need to come off?

[martin82]

here are my 2 cents...

1) I am 99% sure I saw the KW SC kit at the FR Shoot out, if I recall they kept replacing belts on their system? not sure how many broke but pretty sure it was several during the day.....

2) I have also seen the Jackson Racing SC kit on track the weekend before and that car was doing 7+ laps with 0 issues all day long session after session.

[Calum]

Originally Posted by martin82

here are my 2 cents...

1) I am 99% sure I saw the KW SC kit at the FR Shoot out, if I recall they kept replacing belts on their system? not sure how many broke but pretty sure it was several during the day.....

2) I have also seen the Jackson Racing SC kit on track the weekend before and that car was doing 7+ laps with 0 issues all day long session after session.

I'm not trying to say your wrong, you were there, I wasn't . But, cogged belts can transfer a lot of power, considering they often drive camshafts. I wouldn't be surprised if there's another explanation for what you witnessed.

[FreshFRS]

i have to agree with @Calum here, cogged belts on a separate drive loop should not be breaking belts, unless it was an extremely weak (off brand cheap stuff) or defective belt(s) but that is unlikely due to multiple belts being broken. like he said lots of cars with SOHC or DOHC use cogged belts to drive cams and they aren't breaking all the time, there has to be more to what was going on than simply the belt drive creating the problem. more than likely something was out of alignment (engine pulley and supercharger pulley don't match up by large enough margins that the belt is partially off one of the pulleys) or wobbling (iE crank pulley wobble from an improper install) happened lots with some lightweight crank pulleys when they first came out.

[pheoxs]

Originally Posted by martin82

here are my 2 cents...

1) I am 99% sure I saw the KW SC kit at the FR Shoot out, if I recall they kept replacing belts on their system? not sure how many broke but pretty sure it was several during the day.....

2) I have also seen the Jackson Racing SC kit on track the weekend before and that car was doing 7+ laps with 0 issues all day long session after session.

We're they perhaps swapping pulleys to test different power levels ?

[gmsii]

Originally Posted by martin82

here are my 2 cents...

1) I am 99% sure I saw the KW SC kit at the FR Shoot out, if I recall they kept replacing belts on their system? not sure how many broke but pretty sure it was several during the day.....

2) I have also seen the Jackson Racing SC kit on track the weekend before and that car was doing 7+ laps with 0 issues all day long session after session.

HIthere MARTIN82...I am 99% sure YOU ARE A TROLL!!!!!
- you have one post and this is what you talk about?
- doesnt Jackson have a son named Martin? maybe he was born Aug2
- jus sayin

anyways...since you brought this up, let me respond for the sake of transparency and for the benefit of enthusiasts so this pre-production issue doesnt fester and turn into a problem in peoples minds.

first of all...KW would never release a kit that shredded belts...the very implication is asinine and wreaks of troll-desperation.

now to address your observation....yes, we did shred belts at the tuner shootout event. here is why...one of our techs put a NEW PROTOTYPE PRE-PRODUCTION PULLEY FOR THAT EVENT without checking the belt engagement. the drawing we had sent out to our prototype manufacturing partner had two less teeth in the drawing than what was spec'd. so as an example, instead of 38 teeth spec'd, it only had 36 teeth as built...what resulted is the belt only engaged 3 teeth and then would ride on top of the other teeth and consequently that pulley shredded belts in spectacular fashion after about 6 laps at that event. at the event we were puzzled as to why this was happening because the car had hundreds of dyno passes and numerous miles on the street with no issue....furthermore the BRZ uses the same belt drive system as the S2000 kit which never had these types of belt problems in long term durability testing.
since discovering this issue on that track day, we have tossed that prototype pulley in the trash, had a corrected pulley made, installed it, ran it, tested it with no issue at all. in the meantime we were testing other pulley configurations with absolutely no issues at all.

if this post does not adequately address MARTIN82's observation, we welcome enthusiasts to come down and check the system out for themselves...if the car is not on the dyno or apart, we would gladly give you a ride and possibly even let you drive it.

[gmsii]

Originally Posted by Calum

So one of these is B.S.

no....the 80+hp was our initial spec....we have tested other pulleys that produced different power curves (significantly more power across the rev range, but at the expense of a few peak rpms)...we are still debating internally what should be released as the 'base'

[Calum]

Originally Posted by gmsii

no....the 80+hp was our initial spec....we have tested other pulleys that produced different power curves (significantly more power across the rev range, but at the expense of a few peak rpms)...we are still debating internally what should be released as the 'base'

Ok, fair enough. What rpm was the compressor running at, with the engine at 7450 rpm, with the 80+hp?

[F1point4]

@KraftWerks posted a dyno of a 90 mil pulley on E85 + full exhaust. It was 340/240 which is ridic [awesome]

How small of a pulley can you go before you overspin the "stock" blower included in the kit?


Pardon my ignorance, why is the torque curve so "linear" for lack of a better term? Is that a property of the rotrex blower?

Heck yes that means this KW kit will be a good car to drive, daily driven or track!!!!; ease into the power. The Vortech seems to make peak torque shy of 6 and is flat till redline. Innovates twinscrew/roots (forgot which) makes all its torque immediately and holds until close to redline. It seems like the rotrex needs to go all the way to like 7k, then you run out of runway.

Not trying to say one is better than the other, just want to learn the characteristics of each compressor.