schnellfahrer

Danno had me convinced to get a 27/8 but then I started reading all these posts about how slow it spools.
Danno suggested to run the 27/8@21-22psi which should make 320rwhp on stack afm.
Now I'm not so sure anymore.

Jeremy Himsel

My question is why would you run that much boost to make so little power? Why not find a decent Garrett hybrid and make the same power at 15 psi? A lot less to worry about.

Duke

310-320 at 21-22 psi on a K27/8 is on the low side.

I'd like to see a dyno chart of a Garret hybrid making 320 rwhp at 15 psi with AFM! Well, monster sized hybrids with lots of lag don't count..

IMHO the K27 is very underrated by some.

hosrom_951

That is true. Running anything 18+psi would need race gas.

Danno claims that a K27/8 on 20psi would hit ~310 with AFM. Slap on a MAP/MAF and your should be seeing 340~350whp at the same boost level.

The thing about KKK turbochargers is that they are very limited to size. There is such a wide size choice with Garretts, that's why they are so many preferring them to the KKK. But, the KKK would consume less oil and would be more reliable (?).

You can always have a Garrett hybird KKK, which consists of a KKK hot side (for near bolt on) and a Garrett compressor (to give more boost depending on the specifications).

My dream would be to sinatll a K29/6 on the stock car if that works, just imagin how much power that would give you at 18psi.....again.....that's a dream

schnellfahrer

I will spend this winter trying to figure out which turbo to go with.
It has to be a direct bolt on without modifications.
It has to be oil and watercooled
It has to spool as quick as the 26/6.

I was thinking of the 27/6, but Danno tells me that the small turbine will create so much backpressure that there will no point in trying to go higher than 17psi.

I've spoken to a couple of people who run the 27/8 and they tell me that the turbo is slow; no boost below 3000, max boost at ~3500.

I really don't know what to buy. I have 5 months of snowy winter to figure it out.

hosrom_951

Window shop around for turbochargers from Lindsey Racing, Majectic.....

This MAY help:

http://www.weissach.net/Suppliers_92...ecialists.html

porshhhh951

Hosrom you don't automatically have to have race gas to run anything more than 18psi. I have run 20psi in texas summer heat without meth injection...just standard 93octane.

I don't want to sound mean or hurtful in anyway when I say this so please try and keep that in mind but, here it go's.

Please stop posting about thing's you don't have expeirence with. It seems like you get alot of your info off of site's and not from real world expeirence. While website's are a great resource ...sometimes thing's differ in real world term's. More over not every car is the same and will not react the same.

I have seen you more than several time's say your posts advice are just from what you hear. These thread's today aren't the first time. You seem to do this often. I have a feeling this guy isint just asking for a opinion he want's some real adivce from people who have first hand expeirence.

Please please don't take this the wrong way I am not trying to come down on you in anyway. It's just I know I am not alone in this. I think you need to get more expeirence and post about thing's you personally have seen or been through. Instead of posting on subject's that you have simply read about.


oh fyi I have run as much as 23psi without detionation.....but, ofcourse meth don't count.hehe.

I ran 20psi on 93octane pump gas all last summer without detonating once. It's all in the tunning. There is no real general rule of thumb to go by when it comes to boost and detionation. It will vary from case to case.


Thanks for understand my post. And it's intention's.

porshhhh951

I think they k27 is a great bargin but, I don't think it performs on the level of some of the newer hybrid turbo's. I have a friend with a 27/6 that dyno'd at 315rwhp with maf. Ofcourse the condition's weren't ideal but, still his air/fuel was dead on mid 12's and I would have thought his setup would have made more power.

Oh I am also biassed because I love the to4e's. hehe. to4e!! to4e!! to4e!!

schnellfahrer

So John, what do you think of the to4e?

Jeremy Himsel

You know, I have a TO4E on my car and is makes tons more power and spools up faster then the 26/6. I hit full boost @ 3,000 rpm's with a cheapo MBC and a 46MM tial. I've yet to find a 27/8 that makes equivalent power at equal boost levels, runs as efficient, or spools up in the same ballpark. If you can pick up a 27/8 - 7200 for less then 750 then I'd say it's a good buy. Otherwise go with a newer hybrid for a few hundred more.

Danno

Here's a K27/8 @ 20psi. The car has an APE-MAF and 55# injectors. The customer wanted to retain the optimized configuration with a MAF matching chips. So we started at the baseline 15psi that the APE-MAF was tuned for. Then we slowly turned up the boost and re-tuned the chips on the dyno. Ran out of injectors and fuel-pump at around 350rwhp. He didn't want to install larger injectors so we replaced the fuel-pump so we can run 50psi and extend the injectors a little. Ended up at 20psi:



Second dyno-chart with less low-end torque was due to different dyno-operator that gently rolled on the gas instead of mashing it like the first guy. Even then, note that at 3000pm, the K27/8 has more torque than the tock 951 has at its peak (around 4400rpm)! The K27/8 has a lot of potential, it just takes optimized tuning to extract the most of out it (or any other turbo).

shortyboy

does the k27/8 flow enough for 400rwhp?

toddk911

Yummy!!!

I would guess with MAP could squeeze to 400??? But much easier to just go bigger on the injectors.

shaheed

i'm glad you posted that dyno, it's quite a good result but there were some folks running around here last week saying that guru racing was making 400rwhp at 20 psi with a k27/8.

porshhhh951

wow good dyno there Dan.

nothing wrong with 360rwhp.