Spool up characteristics of a K27/6. Are you saying
that it spools just as quick Fast951 ?

 

Quick question fast951, will this turbo work properly with APE/MAF and your custom chips.

TIA

ken

 

I hope to let the list know by spring. John and I have talked about swapping my K27/8 for the new Stage 3 and chips while maintaing my expensive MAF setup. Should not be a problem, just some tuning time to get it right... and a few more months of saving to pay for it.

405hp is impressive. Get it cleaned up and the boost logged on your next run. I'm suprized you havn't already pulled and logged the voltages from your MAP. Hell, I have a sensor just for that purpose since mine is MAF regulated. Spend the bucks, it will help you tune.

 

When does the torque show up and how long does it stick around? Have a graph? One has to wonder what the Stage 5 will do on a 3.0 liter....

 

Okay:

Dand86951 - I am going to clock exhaust backpressure at the next dyno. I know it was low because I was getting 15 hp with every 1 psi consistantly, and I literally ran out of time yesterday.

Jchen - on my car, the Vitesse stage 3 spools at the same time as my 27/6. I have both turbos dyno sheets, so there it is in black and white. I do not know what John has used for the compressor, but it is ridiculously efficient. The boost pipe was around room temp. after all those runs.

Kenlouie - I had this turbo tuned with my ape maf. That is the only configuration that I did not get e chance to dyno. It worked very well, and was a LOT more power than my 330 rwhp k27/6. The only reason I switched to the Vitesse maf is that I was running out of calibration on my datalogger. I was getting 95, 96% from the APE maf with the stage 3 turbo. The k27/6 had never brought it over 90%. These rises are exponential.

Tom - John has all my dyno sheets.Torque comes around the same as k27/6 did. This is about 4000, but I have a cam similar to Milledge's #2 which is pushing it up. Next week I will dyno with stock cam.

For anyone not familiar with Vitesse, this is how it goes:
You will call him about things you read about here. He will tell you how much power you will make. You will not believe him the first time. You will buy his stuff and go to the dyno. You will see that he was right, everytime.

 

Sweet numbers.
But I have a hard time believing a stock cam will gain you power, regardless of the head.

 

Duke -no I am trying to gain spoolup time, not power. I believe my cam is moving the powerband too far up.

 

So what fuel did you use to get this dyno number?

 

Fuel was full tank of 93 Sunoco with 2 gallons of xylene. About 95.3 octane total.
Silver - you are welcome to come and go for a ride since you are close. Are you going to get his stage 3?

 

Ok, I thought you were looking for more power.

 

Hi Specialtool,
Can you explain ( I was running out of calibration ). Does it
mean that the MAF sensor voltage is max out ?

 

Lots of good questions... There are few reasons I decided to modify the existing product line, especially the Stage 3, 4 and 5. I wanted to bring spoolup close to Stage 2 (1bar boost around ~3200rpm). Still maintain good HP potential.. Peak numbers are not as important as the area under the curve. HP is not as important as torque. So earlier spoolup, high torque, good power band. I am willing to sacrifice 5-10% of HP to gain it down below.. Remember the 951 engine is not a high revving engine.. I like to shift at or below 6400rpm. Oh, I like a responsive turbo that comes to life quickly, a turbo that you can modulate instead of a slow, or ON/OFF turbo.

- The spoolup is where I'm happy with, perhaps I can shave 100-200rpm, but as is it's great. I have both K27/6 and this turbo dyno charts, I will post them overlaying each others..
- Top end is very healthy, too early to tell what's the maximum it can make.. I will be happy with 420+rwhp and 380+ torque and a flat broad power curve.

Next dyno session the goal is to use stock cam, log boost properly, clean up AFR, measure backpressure, and 4th gear run. Of course RACE GAS ONLY!!

I would like to thank Jim for taking it upon himslef for going to the dyno, I felt that an end customer posting his own results is the way to go. You will see the whole development instead of just the final results.

The turbo flows plenty of air, so unless the MAF is calibrated correctly and the chips tuned properly you will never get the full benefits of the turbo. Also you will need 72# injectors..

The other good news, I will be testing another turbo and I expect it to perform nicely.
The bad news, due to the complexity of building these turbos (oil management, machining, balancing, etc.) it takes us almost twice as long to produce and they cost more.. I still don't have concrete data on the pricing etc... So if you are thinking of getting a turbo, plan ahead and allow us plenty of time, at least till we manage the backlog.

 

John, Thomas and I are planning to buy the Stage2 kit early 2005. When should we order to make sure the kits will arrive by February?

 

Eivind, Please email directly for details.. I would say place your order ASAP, I can't even get a turbo for my own car

 

Hi Fast,
Congrats with your new turbo. Bravo to
your R&D efforts.