I know the title is broad but I have a few problems with my 'vette and hope you guys can help me out. I have a 2006 AT LS2 'vette bone stock expect for the axle backs.
My oxygen sensors might be out and maybe you can relate to that in my problem.
1. I think i might be having a problem with my tranny because whenever I shift from park to drive the car kicks forward and there is a clunk when it shifts. Second of all when the car shifts while driving there is a clunk or it seems like it revs and then shifts and this also happens when downshifting whether its paddle shifting or the car shifting itself. Also, after coming back from a long drive when the car downshifts it makes a big clunk louder than the original one.

2. The second the problem is that going against a 2011 Camaro SS (Manual) with an intake and another LS2 '06 corvette (manual)with an intake at 45 Miles on the second gear rolling start (this was done at an event no illegal racing what so ever) my car seemed very very slow I was last about a car apart and more against the corvette (my shifting points were head on). It just feels really sluggish.

No warranty with 82,000 miles.
I have no idea what the problem is but I did not expect it not to keep up at least with them.
I can think of any of my other problems but if anyone can help me out that'll be great. Thanks

 

When was the last time you services the transmission?

Is the car stock? If not maybe it needs the tune fixed.

Just one persons opinion......

 

I would check the transmission fluid and consider changing the fluid and filter.

The 02 sensor going bad could make the car feel slower if the fueling is thrown off because of it.

MAF sensors can also cause funny issues with transmission shifting if they are going bad or contaminated.

 

You've got two or three good Corvette shops in San D. Check them out and most likely do what was recommended above.

 

Good ideas. Hopefully the tranny flaring and clunking issue is fluid level related. If the car had an aftermarket oiled CAI then returned to stock when sold, the maf wires might be contaminated with filter oil. Lots of guys remove performance parts before selling their cars.

for question 2:
Manual transmissions usually have an advantage over an auto transmission car if they are similar power to weight from a roll. My old 94 vette and 99 z28, both 4 spd autos were weak from a roll with obvious dead spots where it was extra weak if you let it shift itself.
A stall converter would minimize those dead spots thus improve roll racing and really help from a dig with stall appropriate tires(drag radials).

 

The A-6 should have no problem whatsoever with either car you raced, assuming they were basically stock. It sounds like a tranny issue and a service may be just what you need. AT 45, the car would kick down to 2nd and should pull like a freight train. I don't know that the O2 would be a problem in WOT, but would affect more normal driving. Get the trans fluid/filter changed, not that expensive, and hopefully that will clear up the problem.

 

Thank you guys for the suggestions,

Just wanted to add that some times on WOT there is a lag in downshifting.

I'll look at changing and servicing the tranny.
If it's not what you guys are mentioning what do you think it is?

Did some runs yesterday at a 1/8th of a mile strip the best I could do was 8.960 at 80 something Miles..

**Car is completely stock..**

 

damn...looks like it couldn't get outta it's own way.
go ahead and change the tranny fluid and filter before beating up on it anymore.

 

have the trans serviced and clean the maf unless you had a leak of the fluid changed, level seems to be non issue? Maf going bad? maybe..

but i would data log the car try a shop they'll use their equipment (laptop plugged into obdII port) and drive it around then review the log, you'll have an answer..

 

Fluid level in the trans was my first thought too. A clogged filter can show similar symptoms. Drop the pan and do the fluid and filter and take note of how clean or dirty the bottom of the pan is...are there bits of stuff there or just a thin layer of gunk, which is normal. When was the last trans fluid/filter change??


And stop doing runs at the track until this is resolved...it could get expensive quickly...

 

Thanks for the suggestions guys, will be doing the tranny fluid and filter change hopefully that resolves it. Last time I had it serviced the tranny was back in june last year.

Hopefully, everything goes well but what about the times how are they on a 1/8th of a mile? What am I suppose to be seeing?

For those in San Diego where would you guys recommend me to do the service I usually go to courtesy Chevrolet..

 

FWIW when my car was stock I was running 12.91@111 in the 1/4. My 1/8ths were 8.4's @87 mph in 1200 da at great lakes drag in Racine, WI. Tuned with headers, fast 102 and a small circle d stall(3000ish) I'm running 11.9's at 118 now. 1/8th is 7.7@92.88

 

Thanks for the times, wow im at 8.9 at my best stock I should be shredding the 5.0's. Why is the car so sluggish!

 

As was previously stated, I would go ez on the car if the trans is acting up and overall the car is feeling doggy. Hammer down when all is well and sorted out.
Unless you are running at higher altitude those 1/8 times are definitely slower than norm. If it's feeling doggy I'm guessing you probably aren't spinning a whole lot on your launch so I'll assume your 60ft is decent.
If your trans is slipping or acting up that could account for some of the lack of performance.
I have 87k on my 06 so I did new plugs and wires two yrs ago when I did my headers "just because".
It wouldn't hurt to swap them out and maybe a top end cleaner perhaps due to the higher miles.

 

I ran today a 278 on the dyno, feeling horrible after hearing that If I need to fix her up if there was a problem it would cost around 4K.
Corvette garage owner said it's not something I would be very scared of it would break anytime soon lol.

 

Considering you're anywhere from 60-75 rwhp down (at 278 rwhp) from what would be normal, I wouldn't go running it on the track much, or at all. More powertrain stress=more chance of something going big time wrong. jmo.

 

So after getting wires, plugs, thermo, ported TB, k&n intake a tune installed. I am at 345 rwhp.. I am still not happy with results because I am getting beat on by 5.0's.
But the major problems I have listed have pretty much disappeared which is great. The only thing I notice is down shifting from 2-1 there is a slight jerk.

 

Did you have your tcm tuned? Might want to have someone take a look at your tcm tune.

The horsepower is about right. My 06 A6 with a vararam and tstat was in the 340's as well with 85k miles. I was in the 370's with a ported fast, ported tb,headers/catted x and axleback exhaust. I'm now at 456rwhp after ported 243 heads/cam at 88k. 320-330's stock is normal thru an auto trans.
A 5.0 and a c6 should be a drivers race. If it's tuned/cai they pick up quite a bit and have run in the 11's with those minimal mods.

 

definitely not seeing a drivers race, i am getting my *** handed to me lol. Oh well, i'm seeing 8.7 at best on a 1/8th strip. No idea what to do next.

 

Lol it always stings a bit more to lose to a mustang. What's the da like and your 60ft on your 8.7 1/8 run? You're 3 tenths behind what I was running bonestock and my time was pretty avg.