well I have a 1999 c5 targa m6. long tube headers. magnaflow exhaust highflowcats xpipe, BBK intake,BBK throttlebody. BBK SSI manifold, slp maf (came with a granatelli maf that i took off) custom tune. and my tuner thinks it seems to have a cam albeit a baby one. if itdoes have one, that must have been done by a previous owner so i dont know the stats. but we could very well be wrong. best i can explain is it idles alot like the videos i see of the ecs small blower cam. maybe a tiny bit less lope. but definately more than stock. so it could just be a mix of the tune/longtubes but i dont really have a way to test without pulling the cam.

first run i pulled a 15.xx because like an idiot (last car didnt have it) i left traction control on.

the rest of the night i was DEAD on consistent at 13.8x at 105-106
BTW track is at 3100feet. but even with that altitude. maybe im mistaken but stock c5's with an auto run approx the same speed as I did

my reaction time was ok. im not a dragracer by nature. but typically around 0.2-0.4 but my 60foots are around the 2.2-2.3 range. which i know isnt great.
any time i would try to leave harder i would spin and end up in the 14's. so i had to leave around 2krpm i think i found 2300 max and actually bog it off the line. which dropped me way out of my powerband otherwise it was spin. there was almost no middle ground. tires were about 25psi. tried lower but no change in traction.

here is a vid if it gives you any ideas for pointers that im completely missing.. I would avoid the waterbox. and give the tires a quick spin to knock all the gravel and sand from the pits/staging lanes and what water i couldnt avoid off. but you can see where i would bog but hear the tires squeak like they were about to spin..

 

Do you know what the actual density altitude was that evening? Even in good air 3100' is fairly high. NA cars are very sensitive to poor air and it affects them more than you may think. Looking at a DA calculator even if you assume it was 3100' (I bet it was much higher with the weather conditions) a 13.80 would be a 13.30 at sea level which isn't too far off for a stock or mildly modified car. When ours was bone stock it went 13.30 at 1000' DA so again, you're not as bad as you think. Keep in mind there could be other issues like worn valve springs, carboned engine, etc.

The bad 60' comes from no gear or converter. We put a Yank SS4000 and 3.90 in our stock LS1 C5 (not even any headers) and went 12.30 @ 107 with a 1.60 60' (MT drag radials) last weekend and that was even in 1800' DA. These cars respond well to gears and converters. Looking at your post again I think I'm reading your a stick car and that's out of my area of expertise so you'll have to seek advise from those guys.

Good luck and keep with it! You'll get there!

 

yeah its a manual i should have been more clear. so i edited to add m6 in car description.
but even then I have seen about bone stock manuals running a good second faster than mine. in the 12.8 range and acording to the fast list. boltons alone give a good half second faster time average it seems.
I mean my math may be wrong. but even at altitude i should be closer to 13 flat.

I guess ill have to get it on a dyno and see what kind of hp it puts down to the ground.

 

It's hard to tell from the video and you didn't mention kind of tires you are using, but it didn't seem like the tires spun much on the burnout. Just getting below a 2.0 60 foot should put you in the low 13's. With the mph, it seems that the DA must be even higher than the actual 3100 feet.

What rpm where you shifting at? These cars like to be revved to atleast 6000 or more. I made considerable gains by shifting at 6000 rpm instead of 5500. Also make sure you stay WOT until after you pass the finish line.

For reference, my 99 FRC went 12.48 @ 112 on MT 305/18 drag radials with a Z06 catback, B&M shifter, and a Vararam. I also had a clutch, hardened output shafts, and a DTE brace so there wasn't much worry about launching the car.

 

im running 275/40/18 Michelin Pilot Sport A/S Plus tires. I am not at all impressed with the grip to be honest. they spin at the slightest provocation in a corner
as far as rpm I found revlimit and dropped down a couple hundred. so im pretty sure im shifting at 6kish.

And yeah i didnt spin the tires much. they are street tires. so i didnt want to get them hot and greasy. it was just a quick rotation to knock a bit of the sand off. our track has really dirty pits/return lane so by the time you get back to the line with warm tires they are covered. Plus a bad waterbox design you cant help but get your outside tire a bit wet.

 

IMO, Your only problems are the DA, your 60 foot time and the bog you spoke of. Fix all of those things and you will probably be happy
The good run with street tires is a very fine line of bog and spinning. You have to get that sweet spot in the middle which can take a few runs on the same day. Raise the rpm maybe... 100 rpm at a time till you spin again, then drop back 50. Each day and track will require changes in your launch methods. If you get some ET Streets, it will be alot easier to figure out.

 

Race it at sea level with some drag radials and I bet it runs 12s.

 

Easy !!!