So I threw caution to the wind on the TT issue. I sort of figured I would. I've seen me do it before........stole that phrase from Rob Z I think.

Anyway, Fed Ex rolled up with my tires/wheels at noon, so on they went! I would like to thank Silver93Vert from the C6 section for an excellent deal on a well thought out package. I doubt he reads here, but very nice guy, I appreciate it very much.
GTO spares machined to bolt on the C5. Ground smooth and painted gloss black. M/H bias 26/4.5/17 tires, never used.
Alcoa Z06 wheels painted gloss black with Hoosier 275/40/17 tires brand new. Look rather evil on the MY car.



So, regular bracket night turned test and tune. 12 cars showed up I think. Real live track prep! Sunny and mid 60's.

Different tech guy too, Div 6 tech guy. Told me the RSD bar isn't high enough above my helmet. (I'm 6ft) Shoulder belts not at the right height where they mount. Good thing he didn't look at the side bar mount through the floor. All good, I don't mind. He let me run.

1st run, blew the tires off. New slicks.
2nd run, just roll out and 11.40 @ 122.5
3rd run, 11.16 @ 122.85 1.6 60ft. I'm thinking, potential here.
4th run car doesn't shift into 3rd....hits the limiter, HPT stops logging right there.
5th run 1.60 60ft, 11.18 @ 122.3 Shifts perfect????

Ron goes home. Checks weather. Baro @ 29.8.......and falling. We just don't get good air.

So also spoke with a few regulars who I know, all are off a tenth. And down mph.

Learned something new as well. My car smokes on decel....now I know why I've needed to add a quart in 2k miles. Common for the LS when run hard? Perhaps because I've no PCV hooked up? I dunno!

Fun, but puzzled about the no shift...2 weeks in a row now.

So I set my best mph, but there just wasn't goint to be a ten.....

So, the drag pack? I think it helped the mph. But, little else on this night. The TT was never an issue.

I'll be surprised if we get another race in, the rain starts Friday. Usually ends in June....

ron

 

Good runs Ron. Your ten second slip was just in your sixty foot time. You have got to get some 1.4's going and you are there.

It will come next year for sure

 

So what was done to the spares from a machining standpoint to allow them to bolt onto a C5. What length wheel studs are you using on the front?

 

I'll ask the seller about the machining. The center hole was machined to fit the hub perfectly. And the tapered seats for the lugs did as well. I just bolted to the stock studs with the stock lug nuts.

 

Awesome!!!!

I need a drag pack

 

How much MPH did you pick up over the regular wheels? (besides the DA drop)

You should have seen 2 mph EASY... really should have got 3 but..

The DA must have been really worse to offset that gain... 20-30 hp.


Maybe the driveshaft/couplers trying to rub through the torque tube is hurting your MPH...


YES LS motors are some oil drinking bastards...Especially the pre 01s before they went to coated pistons...And even then they still drink it.

As for smoking on decel, maybe the vacuum on decel is pulling oil through the valve seals/guides a little. I would get rid of the PCV and just run breathers.... LS' are notorious for pulling oil into the intake from the PCV... At a minimum put a good catch can on it.

 

I ran 11.1 @ 123 with 19 x 10" CCWs up front and 17" Wagon wheels with MT DRs.

Wonder how much I'd pick up with skinnies.

 

Alan,

Motorsport Z06 Wheels 122.83
GTO skinnies 122.85

Comes out to $400 per .01 mph.......

Since I don't have DA data at all, the only true comparrison would be A/B testing back to back, same night. Not that I doubt you, but my methods thus far are not scientific.

No PCV on the car, just breathers. The whole catch can oil in the intake deal just seemed dumb to me.

Not sure on the TT, it only vibrates in that small range. So I never feel it when racing.

I'm more concerned with the trans not shifting right when the scanner stops logging. That bugs me.

Besides, I still got .07 on Hugger, and that's huge! Ha! Is this fun or what? Would be way fun side by side.

Forgot to mention, since I wasn't planning on racing, I had over 3/4 tank of gas.....does that count? Good excuse? Can I get a harrumph?

 

Yes it would!!!

Too bad you're alllllllllllll the way over there.

 

I aksed the seller. He, being a tool and die maker, made a tool to re-machine the lug nut tapers in the correct location for the C5 pattern. Also machined the center for a near perfect fit on the hub to maintain the hub centricity. I have to say, he did these perfect. Smooth as glass going down the track.

Again, I was fortunate to find these. A very well executed package.

Ron

 

Here is my A-B test with skinnies. At the track, same day. And this was just slapping fronts on, not putting lighter wheels on the back. Knocked about 50lbs off my car up front.



These passes were all within a two hour window. I had more head wind at the end though....We have 10 mph head winds all day but 10+ mph gusts when I ran the .59


Skinnies will work for sure for knocking off ET and MPH....but everything else has to be the same.

You're extra 60lbs worth of fuel probably cost you 1 mph....

 

I want to hit the track once more this year with skinnies up front.

I'm pretty sure I'm going to do meth next year so the car will run the number all season long.

We'll see though, first I gotta run faster than Ron

 

Did u disconnect ur front sway? That will help with weight transfer. I have front skinnies like yours and really didn't notice any gain.

 

No, I haven't done that. It isn't spinning, at least not when I leave at low RPM.