Jim Green's 90q 20vt - 636whp 07k

[40v4kq]

Good job Jim. Now get to work on topping yourself oncemore.

[40v4kq]

Oh, and can you start reproducing those hood vents? I could use a set.

[85oceanic]

... drool...

[quattro87]

The car is looking way nice. I cant wait to see it in person. Great job!!

[Hank]

Looks great Jim! i can't believe you didn't paint the doors while you were painting the rest of the car!!

Where did the fat fives go?? Heck!! Holy fender

[chaloux]

duuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuude

pics vids etc!!

[Zerb]

this thing looks mean as fiddle sticks.

[85oceanic]

this thing looks mean as fiddle sticks.

Quote of the freakin day.

[loxxrider]

Doors need to get painted, then this thing needs a full magazine feature! I'm sad that the pic is so small :(

[jakethrake]

How was the weekend @ Buttonwillow, Jim?

[audifreakjim]

The track day was really fun, thanks for asking! The car ran really well, but not without a little bit of drama..

The morning was spent with complete noobs on the track, and only one session had passing. People didn't understand point by's so it was a bit of a lost cause, but good to get the feeling of the new setup, and we ran Buttonwillow in a new config so a few new corners to play with is always fun. I was with a new group this time, so I just go and do what they tel me first time out, and prove you can move up.

The afternoon, I moved into the more experienced class and the fun really began. The 275's on the car make a huge difference and really allows me to put the car where I want it during the entire session. The 235's worked for only a few laps, even with r-comps.

The best part of the afternoon was chasing down a few ZR1's that were in my session that refused to let me pass because I was faster in the corners. They pulled me a few times down the straits on my low boost map, and then I would catch them very quickly in the corners. After this happened a few times, I went to the high boost map and was able to stay on their ass down the strait and they started to get the point and finally pointed me by

Now for the drama I temporarily welded my clutch together screwing around in the pits testing my water injection with a little too much slippage. After some cooling off and a drive down the road on full boost with the clutch in, my 400+ ft-lbs of torque was able to break it free.. Next was to check for rubbing, the front is solid, but there is still some rubbing in the rear that a few tweaks to the fender liners will fix. Add it to the summer list of to-do.

Let's talk about brakes.. I need bigger brakes and or better pads. My current setup is Boxter Calipers, Porterfield R4 pads and 312x25mm rotors. I am thinking of pulling the trigger on 996 calipers, rs2 brackets, 323x30mm rotors and switching to Carbotech XP10 pads. The pistons sizes on the calipers are the same, but the slightly larger rotor and thicker rotor should help and the better pads will not hurt either. Thoughts? I could do better pads with the existing setup, but I am kind of done with the wimpy 25mm rotors. Has anyone made a bracket that will use 996 calipers, and the S8 345x30mm rotors on an S2/CQ?

[boxflares]

Interesting timing. I just did some comparisons of various Porsche pad sizes to get an idea of what the differences were between the base Boxster caliper and the 993TT, which I'm running on my S6.

First off, Boxster vs. Boxster S/996:



Now, Boxster and Boxster S (top row) vs. 928S4 and 993TT (bottom row, l-r). More is definitely better, and there was a greater difference in area than I really expected.


I'd suggest trying Boxster S/996 with 322 rotors- I think the additional pad area and bigger swept area should help quite a bit, and the 322s will fit under some 16s and pretty much any 17 without issues.

[ChrisAudi80]

Jim, the Boxster calipers might be considered an upgrade on NA UrS cars, but they are still smaller than HP2 calipers, stock on Euro UrS cars. The same front brakes on stock Euro UrS cars are found on the A8 of the same years.

Just go hog wild and source some Cayenne 6 pot calipers. Pop manged to mount them on an UrS6, so why not on your 90?
You are already running 275s I have no idea on pads.

[5-pot]

I haven't read the whole thread, so apologies if this is irrelevant, but would some ducting from the front of the car to the brakes work for extra cooling? At speed, you could get some decent airflow through to the brakes and keep them nice and cool. If you have some already then ignore me!

Just thinking that the bigger rotors, calipers, etc will add to your unsprung weight. Admittedly, I don't know what the weight difference is between your current setup and your planned upgrades.

[Mcstiff]

The track day was really fun, thanks for asking! The car ran really well, but not without a little bit of drama..

The morning was spent with complete noobs on the track, and only one session had passing. People didn't understand point by's so it was a bit of a lost cause, but good to get the feeling of the new setup, and we ran Buttonwillow in a new config so a few new corners to play with is always fun. I was with a new group this time, so I just go and do what they tel me first time out, and prove you can move up.

The afternoon, I moved into the more experienced class and the fun really began. The 275's on the car make a huge difference and really allows me to put the car where I want it during the entire session. The 235's worked for only a few laps, even with r-comps.

The best part of the afternoon was chasing down a few ZR1's that were in my session that refused to let me pass because I was faster in the corners. They pulled me a few times down the straits on my low boost map, and then I would catch them very quickly in the corners. After this happened a few times, I went to the high boost map and was able to stay on their ass down the strait and they started to get the point and finally pointed me by

Now for the drama I temporarily welded my clutch together screwing around in the pits testing my water injection with a little too much slippage. After some cooling off and a drive down the road on full boost with the clutch in, my 400+ ft-lbs of torque was able to break it free.. Next was to check for rubbing, the front is solid, but there is still some rubbing in the rear that a few tweaks to the fender liners will fix. Add it to the summer list of to-do.

Let's talk about brakes.. I need bigger brakes and or better pads. My current setup is Boxter Calipers, Porterfield R4 pads and 312x25mm rotors. I am thinking of pulling the trigger on 996 calipers, rs2 brackets, 323x30mm rotors and switching to Carbotech XP10 pads. The pistons sizes on the calipers are the same, but the slightly larger rotor and thicker rotor should help and the better pads will not hurt either. Thoughts? I could do better pads with the existing setup, but I am kind of done with the wimpy 25mm rotors. Has anyone made a bracket that will use 996 calipers, and the S8 345x30mm rotors on an S2/CQ?

Sounds like a fun time! Bob Ternes (Trango on QW) home brewed Cayenne Calipers on his allroad

[Hank]

I say you go bigger brakes and hand me down the old boxter setup wiht 25mm rotors for my rear!!

Track day sounds epic with the way you described the zr1 events!!

[audifreakjim]

It was pretty damn cool being able to hang with them down the straits. This is great brake info, I didn't realize the pad area was so much larger on the 996 caliper, definitely encouraging. I have the Cayenne calipers on my A6 and they are really massive and a real chore to fit under 17" wheels. I can't get my 17" enkeis on the A6, but the 17" fat fives barely clear. The Enkeis are smaller diameter in the middle of the wheel.

Also, I already have brake ducts on the car, but they are just blowing at the back of the rotor and caliper, not into the vents on the rotor because the 25mm A8 rotor had the vents on the outside of the rotor that faces the wheel. The 30mm rotor has them on the inside so they could be properly vented.

There are a lot of reasons I see here to just go with the tried and true combo of 996/rs2 bracket and 323x30 rotors with a set of real mans race pads that I will swap at or before the track. With Brembos, it's super easy.

Now I just need them to clear the spokes on the wheel. I am waiting on Phil to measure the hub face to caliper face distance so I can compare to my current setup for spoke clearance, but if anyone else has this handy It looks like the 323x30 rotor has a bit more offset than the 312x25 rotor so I might even gain some clearance if I am lucky.

[ChrisAudi80]

Yep, Pop had his Cayenne calipers mounted under 18" BBS LMs

[EDIGREG]

LOL @ the topic title change from "eats fat fives" to "eats ZR1's" - Love it

Car looks awesome Jim

[Hank]

What rotors do you have in the rear Jimmy?

[chaloux]

That is awesome about pulling on the ZR1s! That's what I like to hear. Congrats on this awesome build.

[savagerocco]

I'm gonna have to check on my rotors, I have the big reds and I think the 345mm S8 rotors on my car, but I am running 18"

[audifreakjim]

What rotors do you have in the rear Jimmy?

urs with turned down corrado g60 front rotors ala Greg Wood. I'll use the B6 S4 rotor next time
http://forums.fourtitude.com/showthread.php?1572831

[a_CQ]

Jim, great hear about relatively trouble free track day...and the car looks amazing, really!

I would like to suggest better pads, but I know what your current compound corresponds to something Hawk makes, which I'm familiar with the most. Most likely, you could use more brakes in the front considering the power you have.

Keep in mind that there are 3 different 321x30 rotors out there, all difference being 5mm of offset. You have B5 S4, C5 A6(4.2) and something else...B7 something IIRC. 323x30 A8 rotors work too, but they are on the edge of being too large of a diameter and may rub on the outside circumference, BT.

Since I have UrS hubs in the front they sit few mm more inboard, and because of that A8 rotor wasn't perfectly centered, even with some spacers between the RS2 bracket and the hub. Since then, I have switched to C5 4.2 rotors and they are perfect and allow for cooling from inside the hub.

FWIW, I haven't had any brake issues on my car, 996/997 calipers front and rear, 321x30 fronts and 300x25 rears. Hawk HT-10 compound front and back. No issues with the old 7A and same with the V8, but I think I will step up a notch to DTC-60s next on the front. Mind you, I carry far less weight, am not heavy braker...I like to go on a touch earlier and smoother and carry more speed into the turn and try to scrub it off going in. There are guys that like to throw an anchor late and really hard, so not sure where you are. I even get away with using cheap Valvoline fluid vs. $75/liter SRF.

I'd say pick up RS2 bracket, 996 front caliper and move the Boxsters to the rear.

[Audilard]

That's awesome Jim. Keeps me motivated to work on my car.