Turbo education help

[seven944]

Tried searching but found no definite answers . I know the kkk hot side is the key to being able to successfully bolt the turbo to our cars without fabrication , but I've seen people do hybrids. Question is, what has to be matched in order to create a hybrid? Can I take a k26/8 hot side and mate it to a cold side of a larger turbo? Would I need to bring the kkk exhaust turbine wheel over aswell? Just looking for some answers! Thanks!


1985 951

[kdjones2000]

Unless you are machining the hot side, I am pretty sure that you will need to keep everything on your current #8 hot side.

You can put pretty much what you want on the cold side, just make sure to get it balanced.

Maybe Vic or someone with more turbo modification experience can chime in here.

[seven944]

Anyone ?

[seven944]

And thanks kdjones I'll see what I can do

[guru944]

seven944:

A K26/6 or /8 hot side and the upgraded Cold side = hybrid. This is the way i really recommend and fully street N strip/track duty. Big fan of KKK Hybrids over Mitsubishi or Garrett stuff. Everything would have to be precision machined, VST balanced and Blue-printed to get good service life and reliability. The KKK/ Borg Warner stuff typically outperforms the others for the last +30 years.
No problem at all. Please visit my web site....PM me for details.

Later...

[nize]

tial now makes a stainless turbo that fits the 951, but you also have to buy the tial motor mount bracket they also custom made specifically for the 951. this is currently the best performing turbo you can get for the 951 as a bolt-on application;
TiAL Sport - Turbine Housings

[guru944]

Nize:

What is the Tial part #'s for both. Could not find any details on their site or the link you provided.
Worth a look and see, Thanx...
Later.

[nize]

you have to call them, as they are special-order custom parts from tial, but they will know what you're talking about.

[seven944]

Okay thanks nize!

[PAUERMAN]

Most hybrid turbos available for the 951 use an aftermarket KKK replica turbine housing in lieu of a factory KKK housing when mixing and matching compressor wheel, turbine wheel and CHRA (center housing rotating assembly) options.

The replica housings that are / were available for the 951 are made by Turbonetics. They unfortunately no longer make the #10 housing, which in my opinion, is the smartest way to go for making more power in a street car. The #8 housing is still offered and what most or all vendors do to make up for the lack of size is to use super huge turbine wheels to offset the restriction.

So when you start hearing the term hybrid, this can be interpreted as a turbo configuration that combines a 'blot on' KKK style turbine housing to a larger compressor and turbine wheel. Common hybrids are: K27/6 or K27/8 for actual KKK brand of turbo and for Garrett based options that use KKK replica housings, there are quite a few configurations available.

I believe that Precision Turbo is now offering a Garrett style (.82 a/r) turbine housing with KKK style flanges that allow for a bolt in proposition.

[seven944]

Most hybrid turbos available for the 951 use an aftermarket KKK replica turbine housing in lieu of a factory KKK housing when mixing and matching compressor wheel, turbine wheel and CHRA (center housing rotating assembly) options.<br><br>The replica housings that are / were available for the 951 are made by Turbonetics. They unfortunately no longer make the #10 housing, which in my opinion, is the smartest way to go for making more power in a street car. The #8 housing is still offered and what most or all vendors do to make up for the lack of size is to use super huge turbine wheels to offset the restriction.<br><br>So when you start hearing the term hybrid, this can be interpreted as a turbo configuration that combines a 'blot on' KKK style turbine housing to a larger compressor and turbine wheel. Common hybrids are: K27/6 or K27/8 for actual KKK brand of turbo and for Garrett based options that use KKK replica housings, there are quite a few configurations available.<br><br>I believe that Precision Turbo is now offering a Garrett style (.82 a/r) turbine housing with KKK style flanges that allow for a bolt in proposition.

Don't flame me for this , but I have some huge cold sides laying around that are ebay units . With a nice compressor wheel and some balancing , would that work ? What is my power limit with the k26/6? What about a k27/6?

[guru944]

Simple review:
K26/6 or 46/49mm, spools up at ~2500rpm, 951/50,51 Turbo
K26/8 48/54.5mm spools up at ~3000rpm, 951/52 Turbo S
The difference is ~-20-30hp because of A/R on exhaust side and compressor wheel.
Depending on which compressor wheel specs 26 or 27 and housing will basically determine your boost flow volume, efficiency and boost range. There are many or 9 different a k26/K27 compressor wheels that are known. I recommend the K27 52-54mm wheel as they were on the #7200 930/965 Turbo in 1986-94 and great flow for +450hp peak.
Yes, You will also need VSR Hi-speed balancing for longevity and great operational life.
I'm a fan of the K27/6 myself for better Mid range power and response... Your thoughts???
Later.

[guru944]

***Opps, Let's try this again, Correction***:
K26/6 or 44/49mm, spools up at ~2500rpm, 951/50,51 Turbo with 44mm Inducer.
K26/8 46/54.5mm spools up at ~3000rpm, 951/52 Turbo S with 46mm Inducer.

Later...

[seven944]

***Opps, Let's try this again, Correction***:<br>
K26/6 or 44/49mm, spools up at ~2500rpm, 951/50,51 Turbo with 44mm Inducer.<br>
K26/8 46/54.5mm spools up at ~3000rpm, 951/52 Turbo S with 46mm Inducer.<br>
<br>
Later...

The k27/6 sounds like it'll work awesome , I really expected more lag!

[guru944]

No change in spool up delay or lag but more torque mid-band because of k27 cold side setup.

**Best upgrade** Later...

[seven944]

Maybe I'll go with that

[nize]

check this thread;
turbo upgrade - pauer tuning

[Travis84]

What, if any, upgrades are required to support a k27/6? Injectors? Adj FPR?

[guru944]

Need 3" exhaust past 300hp..I would recommend at least the stock 37lb, an adjustable Fuel pressure regulator set to 48 or 50psi, DME FQs set for +6 to maximum/ +12 fuel, and a serious Billet Bypass Valve upgrade your pretty safe up to ~400hp. With a K27/6 54mm at 16psi you approaching at 350hp...safe limit of stock unmodified Intercooler.
I would recommend at least some +48lb to 55lb injectors good for 450hp,
at 21 psi --->440hp with modified Intercooler and Pipes.
***This has been proven on 2 951's an 87 and an 88 non turbo S.***
That's impressive... later...