sciff5

iTrader: (1)

It seems like the KB kit is about the same money as the Turbo kits or D1sc kits available for the Ls1. The unit in general is more compact (other than needing a new hood for being too tall) and sound like they deliver power in a mega way over a VERY broad range. I am sure this would make for a powerful car but an even more wild ride in my platform (an ls1 rx7) that is traction limited already. How bout heat on these babies? I know roots blowers suffer from heatsoak big time, do twin screws suffer from the same problem.

How much power can you get out of a 2.4, 2.6, 2.8?? I know really nothin about these things and I am just starting to get intrigued by them and it seems like the only thinkg keeping Fbody people away from them is they cant fit them because of the location. I dont have that issue as the ls1 fits easily in the rx7, but I will prob need a new hood. Not a biggie cause I already have a huge scoop.

I am lookin for 140mph trap speeds and a whatever ETs traction can manage, in a 2600lb car.

Discuss...

Pros?

Cons?

Also one more thing, how much do these KB units weigh? not that its a big deal but weight balance is pretty important to me and that blower is sitting up pretty high in the engine bay.

gametech

iTrader: (1)

Just the blower ( not the intake or lower manifold) on my 2.2L whipple was 39lbs shipped (I just replaced it today and read the shipping weight from the cardboard box). Figure a larger KB with upper and lower units attached at around 50lb + or -. It may even be a bit more than that if you are talking the 2.8L unit. Any twin screw will provide almost instant full boost at whatever rpm you hit the throttle, so I will let you figure what that would do for traction in a 2600lb car. Twin screws are more efficient than roots blowers, but have similar heat issues ( although less by a significant percentage). I don't have any relevant info on the D1sc, so someone else will have to answer that.

Z06PSI

iTrader: (33)

Here is a dyno graph of the system I am putting on. This was a 402 on a low boost run. This was not max effort at all. This will get you your 140 trap times and here is the guy you need to talk to too get one.

http://forums.corvetteforum.com/show....php?t=1911850

I will weight the S/C and the intercooler in a little while for ya.

Johny GTO

from what i have seen (both readng and on the street with cars that have KB's) and been told by those with them, as well as the ride i took in a kb equipped vette.... THEY RULE!!!!

Instant torque at like 1 rpm, loads of power that doesnt fall off. ITs really the best of all worlds as far as i can tell.

sciff5

iTrader: (1)

I am hoping it will be less than 50-60lbs. How hard has it been to install? it looks like a pretty simple setup which I love.. Easier than any turbo or even a procharger.

Z06PSI

iTrader: (33)

That was the 2nd reason I bought it. No intercooler piping at all. 1st reason was to be different as there are not many KB Corvettes around. The install is easy just take your time. The book is excellent for an install.

sciff5

iTrader: (1)

Any word on heatsoak with the KBs?

I have heard its a minor issue but I wanted some more info on it.

Any input

bboyferal

iTrader: (9)

KB... Damn, that curve on that dyno sheet is ridiculous.

Get ready to peg the boost gauge on full boost at, virtually, any rpm you like with a flick of the gas pedal...

Dragframe

iTrader: (14)

The second it's possible I will have a Kb'd c5 zo6. mhmmm

sciff5

iTrader: (1)

BTW I just found a new player in the market.. even though they arent a sponsor. The Whipple 3.3L seems to have even more potential, but they are about 4k more money for a less complete kit, however they do have a F body kit, and I have a motor from a trans am, which meens i would need to get corvette accessories if I went with a KB

Anyone know how much power you can get out of a KB 2.8 on a built 347 on race gas. I think you can theoretically push them quite far but I dont know how far you can really push it before you start having real issues with IATs. Most people seem to use methanol, which I prob wont use.. but I will be using nitrous which I believe drops IATs

Z06PSI

iTrader: (33)

I am thinking max effort forged 347 (meth and C16) will get to 900 rwhp. We will see. The 3.3L is a mess right now. Got any pictures of one where it is a kit? Can't count RJW as he was experimenting. And the side mount stuff. Are they in production as well right now?

sciff5

iTrader: (1)

Right on whipples site they have several very basic ls1 kits.. if you wanna call it that.. although for me I dont really want a kit made for a specific car.. because my Ls1 is in another car.

FieroZ34

iTrader: (1)

This is on a 32v SVT 4.6l, but the concept applies to the LS1.

I'd be rolling with a twin screw, and there's no doubt about that.



The KB blower is the third highest boost number at the start of the graph, the Vortech centrifugal the lowest.

sciff5

iTrader: (1)

Kb is the third highest?? Is that the one that has the sharp increase all of a sudden around 4k rpm.

The 2 top lines look like they are the setup to have.. Those lines crossing close to 5250 make me think they are HP and tq but thats not the x and y axis labeled on the graph

Johny GTO

no actually KB is the highest line across the board.

sciff5

iTrader: (1)

It would deff be easier to read if not all the lines were the same width/ color

Johny GTO

for sure. i just remember seeing that original color. the KB trumped them all.

Urban Legend

iTrader: (5)

Plus the KB sounds at WOT is so awesome.

germeezy1

IMO the KB as amazing as it is, almost hits too hard. I was very close to buying a KB Cobra and I kept thinking I wish it had a more progressive powerband...at least give the tires a fighting chance

Jeff@TotalPerformanceEng

iTrader: (6)

Hey guys,
Redrumss pretty much summed it up with my dyno graph from my 402. What he didnt tell you, is that we went WELL north of 900rwtq and just over 900rwhp on 18psi in my LS2 402 @ 9.5:1cr and a 230-234 cam..

I did 99% of the R&D for the HIGH HP testing on the KB (LS platform)

Plus, I am the US distributor for KB (LS platform) and can hook you guys up better than ANY shop in the country. Dont hesitate to give me a shout..

There is NO DOUBT in my mind that the KB 2.8H will go north of 1000rwhp/1000rwtq on a built LS based motor.. And I am willing to put my money where my mouth is..

To date, I have built the highest HP/TQ KB (LS based) motor anywhere. But I have a feeling my good buddy Redrumss is gonna give me a run for my money.
Until that is, I release the setup I was talking to him about on the phone the other day..

This is what 16psi and 850rwtq sounds like...(You might need a napkin to wipe up)