When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Not bad for the first visit. I think it has more in it. My best so far on a 315/35/17 hoosier was a 11.36@120. Headers, airaid, yank ss4000. Ls3 though.
I agree your MPH seems low---MPH is an indication of RWHP--ET involves more like hooking up and traction---A 1.62 is very good--so to me your car is hooking up well but is down on HP on the big end as it stops pulling-
LS2 with cold air and headers, stock 2.56 rear and a taller tire than most I see on here with the 17" rear setup and I'm gaining 23.6 mph from the 1/8 to 1/4.
I don't think that's bad but don't think it's good either. But not sure what to check or adjust.
LS2 with cold air and headers, stock 2.56 rear and a taller tire than most I see on here with the 17" rear setup and I'm gaining 23.6 mph from the 1/8 to 1/4.
I don't think that's bad but don't think it's good either. But not sure what to check or adjust.
Taller tire can hurt the trap speed a little bit. You did hook well, and ran a solid ET for your mods.
Looking at the LS2 bolt-ons list, I wouldn't say that you're that far below what others have run; maybe 1 or 2 mph low. Excluding the hard core set-ups, there are only a handful of cars trapping 118 mph or higher and some of those are personal bests run in excellent DA or with more mods/weight reduction.
1370 DA seems pretty low for August in the South. Is the track pretty close to sea level?
Have you played with the shift points? There can be 1 mph in getting those nailed.
The mph seems low but it could be pulling timing due to high IATs, detonation or even false knock. Also a big vacuum leak can cause issues. I was losing a ton of power due to false knock on my sc ride.
The converter is doing it's job, but the tire size is killing you. At only 5400 RPM at the stripe, you never got up to the power band in 3rd and suffered through big RPM drops on the shifts.
Beg, borrow, or buy some 275 x 17" and then see the difference.
^^^^ I thought of that too about being low in rpm in 3rd and trying the short 275/40R17. But wouldn't changing the tire size that much affect my shift points?
I don't want to run the short 275 all the time either as I personally don't like the way the short tire looks..
^^^^ I thought of that too about being low in rpm in 3rd and trying the short 275/40R17. But wouldn't changing the tire size that much affect my shift points?
I don't want to run the short 275 all the time either as I personally don't like the way the short tire looks..
Two pair of wheels - One pair of 275's for the track & one pair for whatever you like for the street.
If your tuner adjusted the shift points and speedometer for your 305's, you'll want the shifts set for the 275's and the speedometer set for your street tires. Yes the shift points will be off when your street tires are on, but why care when on the street.
My guess is that your tuner never changed the shift points anyway and that contributed to your low mph.
Most importantly, there are no bonus points on a timeslip for appearance. Ugly or pretty, the quicker car still wins.
Update, ran new best last night. Same mods, nothing changed but a lil more seat time and had some good air. Thinking I need a fast 102 and some nitrous now..
Update, ran new best last night. Same mods, nothing changed but a lil more seat time and had some good air. Thinking I need a fast 102 and some nitrous now..
That's better and mostly attributed to the DA difference, but the MPH is still telling me the shift points are killing you along with the tall tires.
Here are two old timeslips when I had nearly the same mods, DA, and 60' times, but with 275/40 x 17's. Different days in the same lane and nearly identical times. Notice the ET at each point and the MPH differences between your slips and mine. When you get shorter tires, show this post to your tuner, so he can make the shift point changes. I had my shifts around the 6700 RPM point. You'll be in the low 11's.
2020 Corvette of the Year Finalist (track prepared)
C6 of Year Winner (track prepared) 2019
Originally Posted by da6speed
Update, ran new best last night. Same mods, nothing changed but a lil more seat time and had some good air. Thinking I need a fast 102 and some nitrous now..
Those "monster truck tires" are killing your ET and trap speeds as well as possibly lowering your shift points by quite a bit unless the tuner accounted for the change in size.
They are over two inches taller than the 275/40/17s that several people here have already recommended and are also a full inch taller than your stock Goodyears. If you haven't had your shift points adjusted then I'll hazard to guess the car is shifting a few hundred RPM lower than what would be optimal.
They're also quite a bit heavier than the Hoosiers so if changing them is an option you'd easily pick up 3-4 tenths with no other changes whatsoever.
I understand what you guys are saying with the shorter tire. But for now, I want to stay with the 19s on the rear. If I decide to go to a full 17" setup, ill give the 275/40 a try and get my shift points adjusted.
08-30-2015, 12:21 PM
C6 A6 1st time at track with headers & yank
