OEM Turbo's that Should be considered!!

[Chingon]

I'm just making a list of what I've thought should be good for a ka custom turbo kit. You can flame me all you want or contribute by suggesting other turbos. You can also advice how wrong one of the turbo's i've suggested is.

These are in no specific preference...

kkk k26 (may be small but ppl claim it's as good as a t3/t4 w/faster spoolup)

kkk k27 (may be too big? fast spoolup and good quality), this series, although it comes in many different trims and model #'s, is used in the SARD gt-pro kit for the sr20det (claims 500 hp!). Which makes me believe that despite it's size, it should have great spoolup to run on an ka24det. It came stock in many bmw 745i.

holset hx35, hx40 (although the hx35 should create boost, I don't know if the 10cyl diesel hx40 is overkill). The hx40 is used in the sr motorsport's rx-7 stage I kit, but rotaries work on a different "pulse" if I can say.

stock rx-7 tII hitachi turbo ('87-'91). I'ts bigger than a t3 and quick spooling, and can handle 300 hp w/good tuning in the rx. Also, after '89, the turbos created more power w/a better design housing and wheel I think.

Ct-26 off supra MKiii, 89-91, Hey...it's a 3 lr engine with around 220 hp. So I'm guessing why not?

A couple of borg warner/schwister turbos. Although I keep on changing my mind about the different model numbers, it's a brand to keep in consideration.

Lately, I've been interested in the t-25, t-28, t-3 nissan series. Although ppl have deemed them too small, AceInHole sparked my interest after making 230~ in the dyno w/a t-25.

Some other kkk turbos equipped in audis, 2.5 lr 5 cyl volvos, and bmws too.

NOTE: MANY OF THE SCHWISTER/BORG WARNER/HOLSET/AND KKK turbos are found on diesel applications.

I am also attaching an image of comparison between a t3/t4 vs a k26 which some ebay sellers claim "just as powerful, but with bigger spoolup"....suggestions about this statement are welcome.

Some maps of the aforementioned (including the kkk k26's) can be found here: http://not2fast.wryday.com/turbo/maps/all.html#kkk I don't know how to read maps, so if someone could point out potential flaws, etc...I'd appreciate it.

Thanks in advance.

[Structure240sx]

i have a kkk k27 sitting in my room right now

[Chingon]

really...what do you currently have? What do you expect from this kkk?

[fo0manchu]

I have a k26 that I want to try on my kae. The compressor housing is definetely larger than a t3. The turbine housing is about the same or slightly smaller than a t3 with .63 AR. I only wish I knew what the AR ratios on these kkk turbos are. They dont list it anywhere on their turbos.

I had a post awhile ago on the k26 turbo that I got and still haven't figured out the specs of it. But from what Im told, the major diameter of the compressor wheel is between that of a t3 and to4b. And so is the major diameter of the turbine wheel. I never got any answer back about the minor diameters.

Another thing that was cool on my k26 that I got is that the wastegate is adjustable. The fin design on the wheels look pretty good too. It looks as if they were designed for faster spool up. I guess the only way to know how they perform is to actually try it out!

I'll try to get pics posted of the turbo.

[Structure240sx]

the only problem i see with the kkk turbos is that u need a kkk manifold or at least their exhuast flange and maybe some bolts or studs.

[WAbernethy]

The compressor housing on that k26 is tiny compared to the t3/t4. I don't see how it could push very much air, at least not without some serious efficiency issues. I'm actually using a CT26 and have had pretty good results so far. It spools pretty quickly and pushes 9 psi up into the 6k rpm range. I've never seen a map for the ct26, anyone know where I could find it?

[Chingon]

yeah...i've seen the maps for the ct26...I'll give them to you right now!!

[Chingon]

oh...wait..I lost the webpage!!

[TrunkMonkey]

i'm not exactly sure how to read the kkk26's compressor map, but is peak efficiency supposed to be 70%? if so, considering how small the island is, i myself would pass on it.

-demetrius

[Cloud]

We're using a factory T3 from a 1986(ish) Ford Thunderbird - specs are the same as the Z31 T3 - .60/.63AR exhaust

$60 bucks at the local junkyard...can't go wrong with that!

We're hoping for around 240 RWHP with this "small" turbo - we'll see soon enough, the car should be ready in a month or so.

[fo0manchu]

the k26 has the same turbine flange as the t3's. And just like the t3's there are different size k26's. And those compressor maps dont specify the different sizes right? So it all depends on which k26 you get just like the t3's. I guess one wont know how it performs unless you try it out.

[sil80drifter]

i have a 89 RX-7 turbo, the exhaust housing is big, the compressor is a medium t3, so i think it should be decent.

sil80

[hannibal]

Thunderbird turbos have 2 different exhaust A/Rs. Manuals had 0.63 and autos had 0.48. Dont forget about Mitsu turbos - Starions, Volvo 2.3L, GMC Syclone/Typhoon.Here's a couple of lists of OEM turboshttp://www.gamesbbs.com/~turbo....htmlhttp://w ... /turbo.htm

Oh and here's a site about rebuilding a Mitsu 16Ghttp://www.vfaq.com/mods/Turbo-rebuild.html

I have 2 K26 comp maps, one from a Porshce 924 and the other from a 5 cylinder Audi. let me know if youre interested...

[Chingon]

i posted those in the link s15...however they're in german specs....

Metric units pretty much.

[hannibal]

oops! I looked up the conversion factors for the maps. I think theyre on my PC at work. I'll post them tomorrow if ya want

[fo0manchu]

post the one from the audi please! I beleive the audi k26 were the biggest stock ones that made

[Chingon]

[hannibal]

1 kg/s = 132 lb/min

1 m^3/s = 2119 cfm

At PR=1.5, the 924 turbo flows up to 26 lb/min. But like demcj said, thats at 50% efficiency.