TonyG

Matt H

Without the MAF, you cannot run more than 13psi or so boost without running into problems as you cannot properly fuel the car with the factory air meter.

My guess without MAF - 275HP ish

Matt H

Isnt stock more than 13 PSI? I was planning on having chips burned for 18psi and running an AVCR controller.
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TonyG

Matt H

Stock is .8 bar

And remember that the K27 flows a lot more air than a K26.

Matt H

Then it is roughly less than 12 psi. I was going to wait on the turbo but I may do it at the same time now. I was so close to going back together.
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87Porsche951

You don't wanna run your turbo past its effeciancy, if you do you will see no gain in power and sometimes will actually see lose in power.

Matt H

You can run 18 psi on a K26/6 and there is a midrange gain. The turbo is out of its efficiency range in the high RPM so I wan going to taper to 14 psi.
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rhesus

You forgot stickers.... stickers are required by some people to make big horsepower. And maybe some kind of wing

Matt H

I knew that was where my power loss was, i forgot the damn wing!
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WesM951

Tony,
OT but whats the Model # on the spark plugs?

B951S

Ahh stickers! I nearly forgot. Anyway, I have feednback from some guys that the Huntley/SFR stage 1 T04B turbos can be run up to about 21psi before straying too far out of their sweet spot. Thats what I plan to do with the set up described. If I get around 330rwhp then I will be happy.

adrial

B951S, why run 20psi to get 330RWHP when you can run 17psi on a 27/6 and get the same power?

B951S

I guess my thoughts were that a ball bearing stage 1 T04B garret would be quicker to spool than a K27/6. I have read with great interest on another live thread, the comments of Tony G about the virtues of the K27/6. I am still getting up to speed on the latest turbo selection pros and cons so feedback on which way I should go would be greatly appreciated

hally

So if you swapped your k26 / 8 or k26 / 6 for a k27 / 6 and kept the boost down at 13 so that you don't exceed the capabilities of the factory AFM, would you need to re-chip the car, I'm guessing you would, just as the k26 / 6 and k26 / 8 require different chips for a nice a/ f curve.
Regardless it seems like an attractive bang for buck upgrade, then later buy a MAF / MAP and get some bigger injectors and turn up the boost (-:

jimbo1111

A t04b could be run up to 25 psi and still be efficient. I have run mine to 19 psi on pumpgas on the street with no problems. On the dyno 17 psi was max before the knock sensor started to retard timing. Due to low airflow across the intercooler. I think the advantage of a Garrett over a k27 is that you will get a very quick spoolup with a powerful top end. I have a #8 hotside bb that will spoolup faster than any 6 I have seen. As i said on a previous thread most after market turbos could get to 330-340 rwhp at about 17-19 psi. witch is about as much as can be run on pumpgas. It's how you get there that counts(torque/HP curve). On race gas at 25 psi a k27 will heat soak and blowup ware a Garrett is still efficient. A garret will give you a 27/6 spoolup and hold to redline like a # 8 hotside with a cooler air charge so you may be able to get 1 or 2 more psi till detonation occurs.
from my experience this is about the limit for a street car with bolt on's. Anything larger and you car will no longer be steetable. Because your power curve will be shifted to the upper rpm's. My 2 cents.

CarreraCup03

Tony, What are your feelings about stand alone engine management. It would seem that you might be able to get more performance out of you engine with some sort of stand alone. Not that you dont have a great setup as is .. I was just wondering if you have given it any thought. I use a TEC II .. which is not state of the art .. but seems to do the job for me. I have about 350 rwhp at 14 lbs of boost (less than 1 bar) on my race car with a pretty moded engine. I only have a 2 bar sensor on the TEC II so it can only be tuned to 1 bar (I have a 3 bar in the guarage for a later date). At which time I expect to get 400rwhp with more boost. As is my turbo is not really in the efficiancy range .. and my PP head (bigger valves) is barely being pushed.

Anyway ... the point is ... that before I had the TEC II ... I could never get the tuning quite right with a MAF and acr2.

I bet you car with a good engine management could well exceded 400rwhp.

944turbo