hacker-pschorr

Wrong engine, this is a nikasil coated 5 liter with a stock crank and lower compression pistons: http://www.erik27.com/todd/turbo/index.htm

Some later threads:
https://rennlist.com/forums/928-foru...ip-update.html

Video from the drag strip:
https://rennlist.com/forums/928-foru...-a-veyron.html

Various weight savings (He has since removed the sunroof and a lot of other bits):
https://rennlist.com/forums/928-foru...nd-shocks.html

Custom driveshaft and starter relocation:
https://rennlist.com/forums/928-foru...-the-back.html

Weigh in before the above sunroof delete and diet:
https://rennlist.com/forums/928-foru...win-turbo.html

333pg333

Wow...150mph trap is damn stonking. Not that I'd do it to a racecar but I'd be interested to see what my car will do once new motor is on board (and minus rear wing!) What weight did he get his down to? Even stock it would be crazy power to weight. I suppose if we went to the drags in mine we could strip it down to about 2400lbs and perhaps 700whp. We'd have to change the 1500lbs springs at all 4 corners. Amazing how much stock components he's been able to retain also. Great build.

ptuomov

Given that we're comparing 951's to turbo 928s, I'd like to make the follwoing point.

Todd Tremel's engine is philosophically similar to 2x this 951 engine: http://www.refresh951.com/

Both run on E85, sport short-runner intakes, aftermarket rods and pistons, etc.

Clearly, both are making a lot of power and have not blown up, so I'd classify both as unqualified successes. And to my eye, the design philosophy is similar.

333pg333

I know that 951 motor quite well. Definitely a good achievement and a wonderfully presented car. Although his is an 8v and Todd's is 32v. He is just putting the finishing touches on a 16v motor which looks very nice for a street/club car. My motor is quite a lot more modified than the refresh951 one but we also run it only on the track and it is under higher sustained loads than any road car motor. Todd's car is a great achievement in anyone's book!

BC

Its actually heavier than stock, FYI.

hacker-pschorr

In the filming of that video it's over 3,700lbs (maybe even 3,800).
Weight distribution is far more important at the strip than overall weight. I'm very much a noob to drag racing (Todd isn't) and it was a real eye opener when it was pointed out how many fast cars have some serious weight ballast added on for traction off the line.

The first 60' means everything at the drag strip. Per his data logs he has zero tire slip when launching it. Next phase is programming the traction control and turning up the boost for the launch. He has separate maps for each gear, in this video he's only making about 600rwhp at the launch and through 1st gear. Second gear is still lower boost, full power comes in once shifting into 3rd.

He's been back to the strip since the video was taken, max speed 155mph, no video to share. Once fully dialed in he's expecting to top 160 @ sub 9 seconds.

Tires are DOT drag radials, 255's.

The car spent the winter undergoing a heavy diet, while keeping the same weight distribution, roughly 43/57.


Biggest difference is rod to stroke ratio and displacement. Todd kept the stock ratio and 5 liters and also a stock camshaft.

I cannot wait to see the results of the 16V setup refresh is doing. I have a 944S that is long awaiting a new engine, I keep chomping at the bit to work with Todd and Luke on a custom turbo build.

333pg333

Not to sound overly cautious but of the three 16v 944 motors the 944S is meant to have the weakest head and has been known to crack as per some other US builders that I know of. I only found this out when I was contemplating converting a 2.5ltr block to 16v via that head. In fact I know of a hghly modified 944S head in a US shop if you are really interested. It's probably fine for a street/track car but then again who knows. The other advantage of starting with a 3ltr block would be the Siamesed bores as compared to the 2.5lt block. Unless you're going to the trouble of a deckplate or even part filling the block with some form of cement that I've heard people doing.

bd0nalds0n

I read through this whole thread, the whole time thinking, "well, I think spinning the tires is a pretty good way for keeping things from breaking," but per HPs recent post I gather that the launch occurs with no wheel slip, so I guess it's possible and realistic that all that power can be transferred to the ground.

Amazing that the driveline can take something like 3x what it was spec'd for and still survive. I remember asking Mark A. about modded 944 Turbos years ago and his comment was, "they seem to break a lot."

Mind boggling performance.