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Compressor impellers are made of aluminum so they have to get a lot bigger before they affect lag. Boost onset is the same as it was when stock.
I'm running .8 bar, so that is not a crazy amount of boost.
I'm going to modify your statement slightly: bigger compressors are capable of running more boost as they can pump more air before they hit their choke point.
I haven't looked at a compressor chart for a K29 in a while but I know for sure that the stock K27-7200 was maxed out running .9 bar. Doing the bar napkin calculations showed that any attempt to run more boost put the compressor over the choke line. Running at 1 bar verified this as the car was not any faster. The compressor was pumping really hot air so no thermodynamic advantage in that.
If i googled correctly than k29 compressor is Inducer Dia. : 56.8mm Exducer Dia. : 87 mm
Vs k27.7200
Inducer Dia.: 54.70 mm Exducer Dia.: 75.89 mm
So the difference on exducer is huge and this parameter is responsible for higher wheel speed and boost
If i googled correctly than k29 compressor is Inducer Dia. : 56.8mm Exducer Dia. : 87 mm
Vs k27.7200
Inducer Dia.: 54.70 mm Exducer Dia.: 75.89 mm
So the difference on exducer is huge and this parameter is responsible for higher wheel speed and boost
So is the Evergreen compressor based on the K27-7200 housing?
If it is I can't see where it's going to provide much of a bump in hp. Nozzle size will dictate mass flow.
The K29 is as old as the K27. I used it as it was supposed to be a bolt-on. It was close to that but still required me to make a new support bracket for it.
Had I known, I would have bought a Garret ball bearing turbo.
Last edited by Metal Guru; 10-31-2022 at 04:59 PM.
So is the Evergreen compressor based on the K27-7200 housing?
If it is I can't see where it's going to provide much of a bump in hp. Nozzle size will dictate mass flow.
The K29 is as old as the K27. I used it as it was supposed to be a bolt-on. It was close to that but still required me to make a new support bracket for it.
Had I known, I would have bought a Garret ball bearing turbo.
Yes new design wheel to fit k27-7200 without machining, its oem size.
have you got pictures of your turbo? So cold side housing is from k29?
yes best choice would be xona or Garrett g30.
Yes new design wheel to fit k27-7200 without machining, its oem size.
have you got pictures of your turbo? So cold side housing is from k29?
yes best choice would be xona or Garrett g30.
Agreed.
I'm at the limit of what I can fuel with the turbo and cams with stock CIS. Anything supplying more mass flow will require more fuel. I don't know that a Garret would push everything over the edge; I never got around to researching it.
IMO, CIS is really primitive and trying to push further with fuel head mods doesn't result in optimal outcomes. Just eliminating the mechanical mass flow sensor is said to liberate 40 additional hp. Plus, the ability to have 12.5/1 afr through the power band adds torque at low engine speed, where street hooligans like me want it. Better cold starting in a place like Michigan is also highly desirable.
I made a conscious decision to invest in a new interior, Speedline wheels and suspension. I have decent driving skills but I'm getting old and rusty (playing guitar instead of spending time on F1 driving sims ) When on a big group drive last weekend for the first time ever, I felt like I had enough power. I even pulled up on a Ruf CTR who was trying to gap me (not sure how that happened; on paper he should have spanked me) so I'd say I'm good at the moment.
Now when I get my inheritance or win the lottery, that would be a different story
Last edited by Metal Guru; 11-01-2022 at 09:45 AM.
Guys, so I tested raptor setup. It's not built by Charlie but it makes no difference as parts are available for all of us. Its 9 blade turbine and oem size 7+7 performance design compressor.
No any advantage in acceleration times, worse spoolup.
Also no advantage in power tested at the dyno.
This is both surprising and disappointing as I've just had my K27-7200 rebuilt with this conversion. I'm especially surprised because Chris suggested this upgrade and he seems to be pretty data-driven.
I am also surprised and disappointed, after all, Americans always prefer everything big , their horses are also always bigger than European ones, but only on paper. The 9 Blade turbine is great but for high RPM motors where backpressure would normally be an issue.
I believe that the original 12 blades turbine should be installed in the Raptor modification, the compressor wheel that he installs must be better because it is 7+7 and it was recently designed and not 40 years ago.
Is your 965 a 3.3? Mine's a 3.8 so it might behave somewhat differently. Car is all apart now though so I don't know when I'll be able to dyno test it.
10-31-2022, 01:53 PM
) When on a big group drive last weekend for the first time ever, I felt like I had enough power. I even pulled up on a Ruf CTR who was trying to gap me (not sure how that happened; on paper he should have spanked me) so I'd say I'm good at the moment.
, their horses are also always bigger than European ones, but only on paper. The 9 Blade turbine is great but for high RPM motors where backpressure would normally be an issue.
