PVX build thread: one view from the slope

[shbop]

Originally Posted by BoxsterGT

Curious as to how the 993 Tiptronic Starter is working out?

Len

Also curious about when the starter sees the most work. When the motor is cold, or after it warms-up?

[petevb]

The starter is working very well so far. Still getting miles on it. And it can get a workout when the car's cold- it likes to warm up a little.

We made it to the dyno the other day- it made a bit over 380 at the wheels on the Dynapack.


We also found that it's pulling in hotter air than expected past the exhaust, so we're working on making some changes to get cooler air in. Should help power as well...

Need to work on the setup still- haven't figured out the street tires yet, probably running the shocks too stiff, maybe some other issues. Getting there.

30 days until One Lap!

[ghost1001]

Do you have torque numbers/graph?

Very nice project BTW.

[DW SD]

Originally Posted by ghost1001

Do you have torque numbers/graph?

Very nice project BTW.

You can create it.

HP x rpm = torque x 5250
HP = torque x 5250 / rpm

Doug

[petevb]

Originally Posted by DW SD

You can create it.

HP x rpm = torque x 5250
HP = torque x 5250 / rpm

Doug

Yep. 272 ft lbs at the wheels @ 6500 and 7200. Only 190 @ 3500, though...

[ghost1001]

Hi Pete,

Forgive me if I missed it.....what size radiators are you running in the fenders? Have you had any cooling issues?

Thanks

[skinnerd]

Pete:

How has this car been on the auto-x course?
Has it been up to your expectations?

Times good?
Hooking up alright?
Complete satisfaction with the total package so far?

-Doug

[petevb]

Originally Posted by ghost1001

Hi Pete,

Forgive me if I missed it.....what size radiators are you running in the fenders? Have you had any cooling issues?

Thanks

The rads are a bit bigger than 9" by 16" each for the cores. So far we have not had any overheating issues, but it hasn't been terribly hot. Iddling or in stop and go traffic the temp is climbs vs driving, so we're improving the fan setup to cope with 100+ degree days. So far it looks like it'll do fine with those rads, though.

Originally Posted by skinnerd

Pete:

How has this car been on the auto-x course?
Has it been up to your expectations?

Times good?
Hooking up alright?
Complete satisfaction with the total package so far?

-Doug

I've been autocrossing when I'm in town to dial in the suspension, and it's improving a fair bit. I'm dialing it in on the 180 treadwear street tires required for One Lap, which is tricky as the car would prefer much more tire. That said I was 5th out of 91 cars last weekend, .2 seconds out of third. It's putting power down well now, and I'm still a fair bit away from the limit of the car. Improving by nearly a second every event at the moment as the setup gets closer. Grip is low vs everyone on hoosiers and goodyear slicks, but acceleration is insane- I took my first passenger at the AX last weekend- he was pretty blown away.

Thunderhill this Saturday- we'll see how it plays on the big track. So far so good- it's an absolute blast on both the autocross and on the street now that the setup is close.

And yes, very satisfied so far. At first the lack of torque and cold start issues with the Cup motor bugged me, and the suspension setup I'd put on it just wasn't confidence inspiring. But now I'm at that point in development where we're working the issues out and it's just getting better and better every time out. And there are these glimpses, when the car drifts just right and hooks up, that it's just unbelievable. Good times

The front splitter is on, and the rear wing goes on this week...

[BoxsterGT]

Curious, how did the "One Lap" work out?

Len

[kojo911]

Can't believe I missed this post. Just catching up. Beautiful car, truly amazing. Cant believe how straight the door lines panels are. Makes my car look crude at best. Quick question; Why not Toyo R1s full tread? I have them on my car ~2450lbs ~600hp turbo motor. Maybe its' the way I drive it but don't have much of a problem breaking loose. I'm using 335/30/18s. Also, Steve hows the white beast treating you?

[IDGAF27]

any updates? awesom project.

[Flieger]

Originally Posted by kojo911

Can't believe I missed this post. Just catching up. Beautiful car, truly amazing. Cant believe how straight the door lines panels are. Makes my car look crude at best. Quick question; Why not Toyo R1s full tread? I have them on my car ~2450lbs ~600hp turbo motor. Maybe its' the way I drive it but don't have much of a problem breaking loose. I'm using 335/30/18s. Also, Steve hows the white beast treating you?

The rules for One Lap of America dictated "140" minimum treadwear rating. No DOT-R compounds allowed.

[petevb]

Yes, I'm quite over-due for an update. I didn't really feel like posting...

Unfortunately my friend put the car into the wall at Thunderhill while testing for One Lap. While he was OK apart from a sore neck, the car has been down for the count for some time, hence the lack of updates.

The car hit on the right front into the tire barrier, took out the radiator, bumper, fender, damaged the hood... The cage and chassis strengthening did a very good job of limiting the damage to that corner, so we were able to put it back to basically new- very happy (and lucky) it didn't turn out worse. I just went to see the car yesterday and it's basically back to original condition, perhaps a little better as we took the chance to make a few changes. We replaced both the fiberglass front fenders with steel and carbon- these are a couple pounds heavier, but stronger and have a little better shape and wheel clearance. We also did the front bumper out of carbon this time as well instead of fiberglass, pretty much saved the weight we added with the fenders.

Other changes- did some re-gearing, as 1 & 2 were not working as I'd expected at the autocross. It would stick first, but it was just slightly too short at 59 mph for nearly every straight, while 2nd didn't have the torque down low. The result was I was shifting ~8 times on the average course, and I couldn't make it pay, so a more traditional ~68 mph 2nd gear is going in. I'm also trying quicker steering rack (also for the AX- the normal one was fine at the track) and have made some changes to the brake master cylinders. We've completed the track aero package, improved the shifter, etc...

So that's the story- I guess these things happen sometimes if you use these cars as intended. I'll try and post some pics and update when I'm back out there.

[Jeff Alton]

****e Pete, sorry to hear of the setback. Thankfully your friend was not hurt badly. Rebuilt and better than she was by the sounds of it......

Anyways, still one of the best builds EVER!!!

[IDGAF27]

i feel your pain. glad you are optimistic and didn't loose you composure..

[sl951]

Can't wait to see it back on the road. The gearing should be much better.

"Thankfully your friend was not hurt badly." ...yes, he's a mutual friend of ours and got away with just a sore neck.

Kojo911 - the white beast is great, pretty much dialed in now - although I'm not sure how long I'll keep it...

[mjshira]

Originally Posted by petevb

Yes, I'm quite over-due for an update. I didn't really feel like posting...

Unfortunately my friend put the car into the wall at Thunderhill while testing for One Lap. While he was OK apart from a sore neck, the car has been down for the count for some time, hence the lack of updates.

The car hit on the right front into the tire barrier, took out the radiator, bumper, fender, damaged the hood... The cage and chassis strengthening did a very good job of limiting the damage to that corner, so we were able to put it back to basically new- very happy (and lucky) it didn't turn out worse. I just went to see the car yesterday and it's basically back to original condition, perhaps a little better as we took the chance to make a few changes. We replaced both the fiberglass front fenders with steel and carbon- these are a couple pounds heavier, but stronger and have a little better shape and wheel clearance. We also did the front bumper out of carbon this time as well instead of fiberglass, pretty much saved the weight we added with the fenders.

Other changes- did some re-gearing, as 1 & 2 were not working as I'd expected at the autocross. It would stick first, but it was just slightly too short at 59 mph for nearly every straight, while 2nd didn't have the torque down low. The result was I was shifting ~8 times on the average course, and I couldn't make it pay, so a more traditional ~68 mph 2nd gear is going in. I'm also trying quicker steering rack (also for the AX- the normal one was fine at the track) and have made some changes to the brake master cylinders. We've completed the track aero package, improved the shifter, etc...

So that's the story- I guess these things happen sometimes if you use these cars as intended. I'll try and post some pics and update when I'm back out there.

so sorry man...

[kojo911]

Peter, so sad to hear. But glad there were no injuries and the car is back together. Truly one of the best builds ever.

Steve, are you getting an itch for something different?

[pkracer21j]

Where do you obtain one of these quick ratio steering racks? after racing karts and formula cars thats my one pet peeve about sports cars. tooooo many turns to lock!

[petevb]

Originally Posted by pkracer21j

Where do you obtain one of these quick ratio steering racks? after racing karts and formula cars thats my one pet peeve about sports cars. tooooo many turns to lock!

I'm trying this one from Germany:
Porsche 911 - 914 Rennsport Lenkung im Tausch - Albert - Motorsport
2.5 turns lock to lock. The jury is still out on quality- it's higher friction than the stock one that came out; we'll see if it loosens up a little with use.