My car spent a couple weeks at Precision Motorwerks receiving an annual royal pampering spa treatment.

One of the things they did was cut a hole where the jump start post is in order to fabricate a cold air intake. This was based on Daryl's writeup--they cut the hole a little higher so that the coil could remain in position.

Greg was kind enough to have the car dynoed. I have the sheets and will try to upload in the next few days, but the car put down:

419rwhp and
370rwtq

Based on 18% drivetrain loss, this is right around 510 crank hp.

I run an intercooled autorotor putting down around 9 pounds of boost, using 30lb injectors.

I think with an X-pipe like Tony's, I should be in his power range--around 460rwhp and 425rwtq, since I'm basically where he was before the X. AFAIK, he puts the most power to the ground among twinscrews, but someone please correct me if there's a higher number out there. Maybe Woody?

I'm told the car still runs a bit rich, and will be having the LH and EZK SharkTuned once final versions are available. There should still be a little bit left on the table for optimization.

 

Hi Brian,
Impressive numbers :-)

The EZK version of SharkTuner should be released within the next month...

 

I think there are quit e a few of us in the 460whp + club.
What amazing is we are running MX422's and DR has matched our numbers with his MX418 and a very flat torque line of around 400.

 

We've got the LH tuner if Greg wants to borrow it.

 

Very nice!

 

Brian, great numbers

Any pics of the cold air set-up?

 

Brian:

Welcome officially to the 400+HP club. I hope to join it later this year when I install the intercooler and up the boost a slight amount.

I'd like to see some shots of the cold intake location too!

 

I meant to post earlier, but I saw your car one day in Solana Beach a month or two ago (your wife used it to go to the bank) I know cuz I was admiring your car and asked if she knew about Rennlist and she said it was you...

Anyway, I was inside the Solid Brick Bank and could HEAR your car rumble off while I was still inside, it sounds GREAT!

 

Great numbers Brian! Please do post pics of the cold air change.

 

Brian,
Great numbers. I had two runs at 466 and one at 463, but it has been around 420 lately (needs a tune up). I have purches new headers and exhaust and they should be delivered in the next two weeks, this should increase my numbers a bit.
A few people and myself have been discussing the cold air intake with the twin-screw, and have come to some conclusions:
- The screw heats up the air so much, the difference between ambiant and engine air is very small.
- Make sure your fender well has air ported to it, otherwise it may create a vacuum, and hurt performance.
- The intercooler is the key, make it colder and you will be more efficient. I am looking at having a heat exchanger before and after the intercooler, this will keep the tank from storing hot water. Also adding some vents to cool the tank may help. I am also looking at adding pusher fans to the heat exchangers.
- Washer fluid or water/methanol in the intercooler will keep it colder. I need to test for corrosion.

As long as we are making progress on the 928 I am thrilled.
Good luck,
Woody

 

I've asked the wife to bring the camera USB cable home tonight; I'll shoot some pix of the intake.

I think that the #s will come up quite a bit with a crossover, pressure should come down a bit with flow going up.

 

The air filter is right behind the headlight; I'm pretty sure it gets air without vacuum. It's definitely better than what I had, which was basically dryer vent hose running over the radiator and the K&N cone filter wedged in there. It seems to breathe a lot easier, and the intake note has changed.

I already run a heat exchanger, although I am pumping the water from the tank to the exchanger to the intercooler to the tank, and I think Richard says it should go the other direction. I am using plain water, but I think Tony found an improvement by running washer fluid.

BlownBeast had a custom tank made and had an AC evaporator placed inside--so he could chill the water in advance or on the fly. Cool idea, but I'm not that fanatical yet.

I'm much more interested in getting the torque number higher-- since it's an 2.20 auto it takes a while to get to the higher revs and HP, and I spend a lot of time in the 2-4k range. More low end grunt would make a big difference, and I think the freer flowing exhaust should help a lot.

Pics of the intake:

 

Have you changed Gregs mind when it comes to turbos and superchargers? Last I was in there he thought all you guys were nuts!!! I would love to do this with a car someday.

 

I think his opinion of them is improving, and we talked about DR's idler setup which is far superior, as well as burning some custom chips to deal with the richness issue. My car puts down some fairly impressive power--probably not as reliably as a stroker would if you had racing in mind--but that's not my purpose. I've had my SC on for over 18 months and no problems. Greg said the compression was "perfect." Hopefully it will go a couple hundred thousand miles before another rebuild.

I highly recommend the supercharger route, and am pleased to count myself among the trailblazers, although I have relied on the expertise of others far more than I've provided.

 

Brian,

Are you leaking any oil from the DS cam cover?