K24madness

I got an Greddy boost controller and the car seems strongest at 1.1 bar.

I also have the Andial IC, protomotive software, Adjustable FPR.

vrus

I was running 1.1BAR on my K24 setup also.

viperbob

on 91 octane, I run 1.1 bar. On 100 octane, I up the boost to 1.3 bar.

Corte Loco

Can the ECU be reprogramed to the octane needed?

K24madness

QUOTE=viperbob]on 91 octane, I run 1.1 bar. On 100 octane, I up the boost to 1.3 bar.[/QUOTE]


Are you talking about your K24 hybrids or stock K24's??

viperbob

Hybrids.

Corte, I use an external boost controller... I just set it manually when I am at the track. I was running 1.5 BAR for a while when I was testing. What a kick. Spinning the slicks in 4th gear is kind of scarey though....

Corte Loco

Thank's Bob. Sounds like I need to save some $$$ to add more ponies to my car and fell the 4wd spining in all gears . With that power don`t you need a harder shaft? Spining in 4th with slicks sound EXCELLENT for my taste!!!!

Corte Loco

Wich boost controller are you using? Pics?

viperbob

I am using the Greddy E01. It has more features than I really need, but it works fine... Sorry, I do not have any pics. I mounted it to the backside of the glove bos so you can see the display when it is opened. I have a boost gauge in the car, so I do not really need to see it for any reason when I am driving.

Bill935K3

"on 91 octane, I run 1.1 bar. On 100 octane, I up the boost to 1.3 bar. "

Hi, Have a question for you 993 TT guys, What is is the compression ratio on these motors? I thoght 993 had 9:1 so 1.3 bar sounds like a bunch of boost on 100 octane

FYI I run 1.25 bar with 7.5:1 in my CIS based race motor (2 Porsche motorsports K-24's). We agument the Euro injection system with 2 GM injectors on the intake plenum, duty cycle on the injectors is controlled electonicly for RPM and boost. I run VP C12 (pump rating 112 Motor octane=108)

Rassel

I think it's 8.0:1 from factory for the Turbo and 11.3:1 for the N.A.

Jean

Bill,

You are a lucky man!
Yes we run 8.0:1 as Rassel said. These Motronic cars can take more boost safely than CIS I believe, since the combustion is more optimized (or can be) across the power band and allows you to tweek AFRs all the way through redline, avoiding detonation much better than CIS, also the knock sensors help I believe in avoiding this.

Typically you could run at 1.1 - 1.2 Bar without leaks at the cylinder head level, in fact some ECUs see 1.5 Bar for a very short period of time to settle back at a lower boost level. On my CIS 964 3.6T, that has 7.5:1 compression, I would never run 1.1 Bar without special head sealing or good mating work done on the heads and cylinders+ ARPs. Whereas if you move to EFI you can "safely" move to 1.2Bar if properly tuned, at least for a good while.
I could be wrong but this is what my understanding is from talking to several builders, Steve W. or Stephen K and many others would be a much better source of more technical info.

Jean

K24madness

Judgeing by by the compressor maps on the K24's the 1.2 bar level still has very good efficency.

nman413

Does anyone have a like compressor map for a k16 hybrid?

viperbob

I do not have K24s, but hybrid ones with larger compressor wheels that are ZC'd. I have run them at 1.5 bar and they are AMAZING. No sign of leveling off. The ZC process itself will add a tremendous amount of efficiency to the turbo. I could definitely see stock K24s falling off over 1.0-1.2 bar.

In order to hold off a certain rebuild, or more commonly know as a "Kim", I tend to run about 1.3 bar on the track with 100 octane.