Brent 89 - GT

In my unending quest for more bang for the buck I am now considring a K26/8 for my car. It was kindly offered by a 952 owner upgrading his car. Question is, does the K26/8 work efficiently at ~6000 rpm and 15 psi? If so I saved some dough, if not I remain undecided. What I really like is the K27/7 by Powerhaus, but at $1500 it should be great. And at that point another $100 gets a Huntley ball bearing Garrett.

Macabre

3k-warner does not release their flow maps to the general public.. if you are able to get them somehow, make sure to share the wealth

jbailey930

http://www.3k-warner.de/english/produkte/bauprogrk.htm

Is this what you are looking for?

Macabre

The chart on their website isn't useful because it doesn't show the values for a given turbocharger, it just shows the range of values for a series of turbocharger. There are huge differences between different turbos in the "K2" (K24,K26,K27,K28,K29) series that you can't see on that chart.

A flow map looks something like this:

aka 951

ouch

David J. Harrington

Here's mine



Thanks Erick!

Dave

Danno

No such thing as a Porsche 952, maybe a 952 engine-designation, but that's it.

As for the K26/8, forget it! In stock trim, it would start dropping stock boost (12psi) after 5500rpm down to 10psi by redline. If you increase the boost to 15psi, like with a boost-controller, then this drop-off point will be earlier like 4700rpm down to 10psi by redline. Just say no!

If you're going to be upgrading your car, do it once and do it right the first time. Especially the turbo since it's a pain to replace. Get something with ball-bearings with newer technology in it (KKK is stone-age stuff). Garrett hybrids are good choices or really trick stuff is from IHI with Inconel blades, etc.

Also forget the bolt-on MAF-kits with fooling the stock computer tricks. You're going to eventually want more than 350-400rwhp, which entails using MAP-sensors, bigger fuel-system and a replacement engine-management system.

Macabre

Danno:

I've had this debate with you before so I won't get into it again , but I think you're dead wrong that everyone is going to want more than 350rwhp. Maybe it's just because I'm not into drag racing, but honestly I think that is WAY MORE than enough for any street car weighing around 3000lbs. I wouldn't go with a K26/8 either, but I think the K27 hybrids are a fair deal. The Huntley BB garrett stage II is probably the best street car setup (in my opinion).

C DeVito

As the third owner of my 89 951 there could be some undocumented changes to it, but I am very sure the only mods are the APE Stg2 chips and the Huntley MAF I installed. My K26/8 will push 16psi and drop to 14.5 at redline using the stock cycling valve and wastegate. That was true of my 88 951 with a K26/8 as well. That turbo install was a mod.

CSD
89 951 w/bad exhaust valve

Danno

No I wouldn't say EVERYONE. But I've run into WAY, WAY more people who are dissatisfied with the limitations of their bolt-on systems once they've hit the 350-400rwhp barrier, than people who have remained satified for years. They all say they want more and wished they'd gone a different route.

Besides, once you get on a real racetrack like Laguna, Willow Springs, Sears Point (dragstrips don't count), no amount of horsepower is enough ! , heh, heh..

I guess it comes down to knowning yourself and being honest as to where you will feel satisfied.

Yeah, that's what I have too and it works quite well. Spools up earlier and faster than stock and I just LOVE that high-pitched whine at 6000rpm+ (hit redline just about every chance I get).

You might want to do a dyno run that measures boost and air-fuel ratio. No mechanical gauge is going to be super accurate. Porsche states where and how much the boost drops off and I haven't seen a 951 dyno chart yet that doesn't have a high-RPM drop-off using a K26/8.