disasterman

We had some cooling issues that are now resolved but my timing chain broke three weeks ago before a race. The good news is that it only took two weeks to get it out, source the parts and have it back on track.

Bent a few valves but the heads were still good and we found the missing link in the pan.

But....to maximize the car for it's new ST1 class designation we wanted to add a little something extra.

After running some simulations by a local LS6 racer, engine builder (he had at least 30 LS motors in his home shop plus 10 new blocks) we selected a cam plus some free flowing heads, both of which he had in shop.

Rennlister Eniac did all of the work.

I ran the car on our local track Waterford Hills and the car is a monster. Even on 15 cycle slicks the car was at least 5 seconds faster (1.4 mile track) than a well set up 996 cup with DOT's.

Set up change plus the mid-range torque increase made a significant difference.

New setup;

6 degrees negative castor
3.6 degrees of camber front
2.6 degrees of camber rear
2mm toe in rear
0 toe front
750 pound springs front
1100 pound springs rear

The cooling issues were resolved by installing an Evans water pump, stock quits increasing flow at 5500 rpm.

User 52121

Timing chain broke?

But but but... LS1 reliability?

Sorry... had to.

Congrats on finding more time. As a former LSx junkie... these motors respond amazingly well to mods - especially cams and a good set of heads. Glad to hear that you're putting the old 944 chassis to good use beating up on Cup cars!

disasterman

LS6 crate actually. I found out through my local LS6 expert that I should not bang on the rev limiter, I should have just raised limit to 7K. I was bouncing off the limiter every time I went through the Honda bridge section of Mid Ohio (16 races). Unlike a euro motor it put too much stress on the chain. Won't make that mistake again.

Cost would have only been $300 in parts to put it back together without the changes. New heads and cam (including new valves installed) was $1300.

odurandina

nice pic !!

did someone mention something about bent 20 dollar valves? repair? meh....

let's see: new found power, running good.... at a fraction of a 944T engine repair $$$.

67King

Curious to know what you run out there. Been I guess 12 years, but that is where I was introduced to road course racing, helping a friend with an IT-E Mustang. Ran 1:17's, I think. Seems the Formula Continentals were in the 1:08 range, and there was a guy with a grey market Cosworth Escort running around 1:10. No other fendered cars were close. 5 seconds faster than a Cup is screaming. You have to be bumping up around that kind of time.

disasterman

1:10's. Cup was running 1:15's. The cup is running T1. Most of the T1's are in the 14's and 15's.

I am racing there this weekend so we shall see. They will probably place me in GT1 or GT2.

The track is 10 minutes from home so I have more than a few laps there. We have our local PCA track days at WH too, I instruct and drive.

I only raced there one other time in the rain and started last 21st, finished first last fall.

Droops83

Hi,

What's your chassis setup like? How are you getting 6 degrees of caster?

Thanks,
Chris

333pg333

Very impressive Jim! Both the results and the quick and improved fix.
We run pretty similar geometry although very different spring rates.

disasterman

What is your setup?

333pg333

Not sure on total castor but camber and toe sound very close. Springs are 1370f & 1486r but I think we're going to increase both a little. With improved front downforce we need more up there.

When are we going to see/hear some video??

disasterman

Will try to get some video this weekend.

We were able to increase castor by shimming the castor blocks.

By the way, I just found out that the Kokeln Orca car is now local. They ran a vintage race at Waterford with a dismal 1:16. It sure looks good though.

333pg333

Have you done anything to alleviate bump steer?

Guessing Orca could go faster with different driver?

disasterman

Bump steer is controlled using some very trick spindles made by Midwest Eurosport in Chicago. Pins a lengthened/welded on and the spindle is webbed with welded gussets. Brian form Eurosport has been supporting a flock of successful 944/951/968 based race cars for over a decade. I got to know Brian after I found his crew crawling all over my race car at the club race we host. Great guy with a wealth of knowledge on set up. If you are interested let me know, he requires a donor set of spindles and I would be happy to assist since you are "over there".

User 52121

+1 for Eurosport. They know how to build race cars. Brian and George are both top notch guys.

333pg333

Interesting. We have put in a bump steer kit as such and it seems to be working ok but it doesn't run at the same angle yours does which makes me wonder. I've passed your pics onto my builder to see what he thinks. Thanks.