I had K24 Race turbos from FVD on my car. They had ceramic impellers, modified actuators, and the interior housing was polished (among other things I dont remember). You could blow on the impeller and it would spin.

My car was rated somewhere around 600hp with all the modifications (although never dynoed). I can tell you there was just a tiny bit of "lag" compared to a K16 car, but at 3,000RPM I was at full boost (1.1BAR) and the car took off like a rocket.

I remember a little encounter with a CBR929RR motorcycle who was very shocked he couldnt keep up with me. And that bike put down 124hp to the rear wheel (that's what the driver told me).

The point I am trying to make is that if you spend the money and get a properly prepared set of K24s, no K16 car will keep up with it, period. I ran my car against a bunch of other 993TT and even some that were supposedly at higher power levels couldn't keep up.

If you plan on going far with your engine, the K24 will give you more room to grow. The K16 just can't flow enough air once you get to a certain level.

That's my $0.02 anyways...

 

VRUS your wrong with the flow.. Unless you start to stroke the 993 engine over 3.8 ltrs even K24's won't be the answer. I also want to see your ceramic impellers, they might be ceramic coated, I highly doubt ceramic compressor wheels. Now early 90's Supras had ceramic/alloyed turbine wheels.. Stage 4 Hybrid will see 28-30 PSI...

 

Scott, & everyone.. As my solid suggestion to all of you, my hybrid based K16 will out perform the K24.. I will give you my word, after a conversion if you can't say that K16's provide more kick, boost, and sustained acceleration to redline and above, I WILL REBUILD YOU K24's and hand them back to you...

 

Kevin
Why don't you provide some before/after (K24 to your K16 hybrids) dyno charts for us cynics to chew over. I would love to believe what you are saying but words like "kick" boost" and "sustained acceleration" don't mean very much. You tell vrus he is wrong about the K24 flow and the K24s won't be the answer - but what is the question ? "A stage 4 hybrid will see 28-30psi" so what does this tell us exactly ?

 

TB has a great suggestion. It would be a big help to see runs with modded 16s and 24s.

Bob, care to chime in as to why you went K-24 instead of K-16?
I remember you wanted as little lag as possible 'cause you HATE Vipers

 

Kevin,

When I made the statement regarding having more room to grow for the K24 I did realize that it had its barriers also, but I was only trying to point out that the K24 will get you more flow than the K16 so there is more room to grow with the K24.

I know you know your craft very well and I meant no disrespect by any of my statements. I was only trying to point out what some of my experiences were.

Unfortunately, the car in my sig was sold and I am hunting for a new one so I can't be of any help with respect to the turbos on it. I only remember that I was told the impellers were ceramic. When they arrived at the shop from Germany I was called in to look over all the parts and I remember he demonstrated them by blowing on the impeller wheel and it spinning. Believe me when I say, there was no noticeable lag in the car.

They were expensive and were modified as per my mechanic's specs. I remember I paid something like $5,500CDN for each turbo. They were ordered from FVD Germany and were worth every penny.

 

When my K16 hybrids (with Zero Clearance and ceramic coating) are finished with break-in, I'm going to dyno the car locally. I'd be pleased to serve as the guinea pig if someone (Kevin?) wants to show up with some nice K24's with all the goodies too.

 

I have dynoed several cars with Kevin's Hybrids in both stage 2 and stage 4 and in both cars I did, they did not fall off but they were sized properly for their application. The stage 2 was in a 993tt that was stock with the exception of turbos, no cats or mufflers, larger injectors and MoTeC. They produced about 550fwhp at .7bar of boost. The stage 4 is in a 3.8l GT2 evo cam, FVD intercooler, injectors, aftermarket ECU, no cats, no mufflers, single ignition and produced over 650hp @ 1bar

 

Any dyno sheets we can see? What was the peak HP & Torque RPM's

 

I would need to get permission from my customer to post his sheets. The Stage 2 car produced peak torque of 430AWHP at 4897 and peak HP at 5263 RPM. I don't have the stage 4 handy and it really isn't representative of what we're talking about here since it has been modified with displacement, cams, etc.

 

Kevin,

Do you have a picture of the exhaust side of your K16 hybrids? I'd like to compare them to what Ruf and the factory has done on their K16 hybrids.

To all, be careful with the K24's. Unless you're racing in a straight line, a properly-equipped K16 car will blow you away due to the faster throttle response. I've seen this first-hand on mountain roads.

Here's a great link:

http://www.andial.com/content/faqquest/quest1.htm

 

Bill:

here is a pic of the K16/K24 hybrid hotside (w/ceramic coating)

 

Stock K16 hotside

 

sideview

 

sideview