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I'm thinking about replacing my oil-leaking stock 26/6 turbo with something that is "plug and play", if such a thing exists. Funds for upgraded chips and other goodies that are needed by a bigger turbo don't exist right now, so can someone recommend a turbo that will offer more oomph, yet can retain the stock chips?

Also, what do the numbers in "26/6, 27/6, etc." mean?

BTW,do turbo's that are going south make a clattering noise during off-load situations? A Rennlister said it did, and I was wondering if anyone experienced the same.


Thanks <img src="graemlins/xyxwave.gif" border="0" alt="[bigbye]" />

guardsred951S

Could go with the K26/8 that came on the 'S' cars. This wouldn't yeild much if any flow increase but would allow boost to be held for longer and allow a slightly higher power output. Spoolup time would be a littler slower too. The nice thing is that it would bolt right up, no messing around.

I understand that the larger turbos need a few adjustments to both themselves and the parts around them to fit. But these are minor and for the potential power increase, definately worth the money/effort.

Any turbo will likely need "indexing", which isn't apparently too difficult....

<img src="graemlins/beerchug.gif" border="0" alt="[cheers]" />

Danno

"I'm thinking about replacing my oil-leaking stock 26/6 turbo with something that is "plug and play", if such a thing exists. Funds for upgraded chips and other goodies that are needed by a bigger turbo don't exist right now, so can someone recommend a turbo that will offer more oomph, yet can retain the stock chips?"

Sorry, no such thing exists. ANY turbo that has more "oomph" will not work with stock chips. And there are no matched turbo & chip combinations that I know of. Aside from a TurboS K26/8 with TurboS chips. Or one step up from that would be a TurboS K26/8 with our GURU Racing K26/8 chips. But that's it.

Outside of that combination, there are way too many variables as far as flow-patterns, boost-levels, to allow a pre-programmed chip to work.

With any other turbo, you'll need some way of fine-tuning your configuration. Be it a dyno-burn-chip-retest-dyno-burn-chip cycle as necessary, or you're going to need some of a programmable system.

As for when a turbo fails, yes worn bearings can allow the axle to wobble enough and let the compressor or turbine wheels rub their housings. But usually the seals will have failed well before this and you'll be dumping out tons of oil into your intake. Especially at full-throttle under boost.

951carter

Danno, doesn't Autothority have an off-the-shelf k27 chip?

tecart

i have their k27 chip, they also sell a k27 autothority maf chip, and specifically taylor your k27 chip to the banjo bolt jet/carb. restrictor you use, be it 1.45, 1.25, they also refer to it as boost 1, boost 5, on so on

sm

Thanks for the replies guys <img src="graemlins/beerchug.gif" border="0" alt="[cheers]" />

Danno - If I went with the 26/8 Turbo, GURU Turbo S Chips, and a MBC, what can I expect the spool up times to be around? I left out in the first post that lower spool up times at the cost of high-end power is fine by me. What will be the RWHP be with that package?

Will you be offering any K27 chips in the future? I was reading that the K27/8 Turbo is a good upgrade from stock - is it?

Tecart - is your car a 944 Turbo or 944 Turbo S? How has your combo worked so far?

Thanks!

Danno

"Danno, doesn't Autothority have an off-the-shelf k27 chip?"

Yeah, they have a K27 chip, but it's only works with their banjo-bolt set-up. If you use a manual or electronic controller, it will throw the curves completely off. Even then, it's the same as their K26 chips, way too rich in the midrange and dangerously lean in the upper-RPMs. I wouldn't consider that safe enough or optimal to call it a "matched" set for drop-in upgrade with a K27 turbo.

"If I went with the 26/8 Turbo, GURU Turbo S Chips, and a MBC, what can I expect the spool up times to be around? I left out in the first post that lower spool up times at the cost of high-end power is fine by me. What will be the RWHP be with that package?

Well.. unfortunately there's no free lunch with turbos, you'll actually be getting the reverse (higher spool-up times with more high-end power):


From <a href="http://www.novustelecom.net/~fkassam/dyno/dyno.html" target="_blank">Farzaan's Dyno Day</a>.

You can see the temporary hump caused by the boost-spike of the AutoThority banjo-bolt. This hump can be extended with a manual or electronic controller to hold max-boost longer. With our chip, you can expect a smoother curve like the SteveR or TurboCup chips (and about 5% higher peak). Less low-end lag and more immediate partial-throttle/mid-range response.

"Will you be offering any K27 chips in the future? I was reading that the K27/8 Turbo is a good upgrade from stock - is it?"

We do have a K27 chip but it needs further work. Found some bugs a couple weekends ago when dyno-testing it. Also from the numerous configurations possible out there with K27/6, K27/8, various wastegates and controllers, and user-selected boost-levels, I don't think we can ever offer a K27 chip as a straight matched drop-in upgrade. Some programmability or adjustments will always need to be done with a K27.

A K27/8 is a decent upgrade for the 2.5L 951. But I've never seen one do over 350rwhp and that requires 22-23psi boost. A Garrett can do that using only 18psi boost.