Got my time slips from the track, looking for some help...

I went to the track yesterday for the first time after receiving my car from the garage. I had many mods done including: xe230/236 cam (kit from cmotorsports) locally ported stock heads, 52mm TB, hooker LT's, mufflex exhaust, 28 lb injectors and pcmforless tuning. The car was stock before this (besides free and cheap mods), and the suspension, tires, tranny and rear are all stock.

The car ran great but I was a bit disapointed with my times, and maybe it has alot to do with me not being the most experienced driver, I guess I need to practice alot more as well. For the launch I tried dumping the clutch at 2500 and trying to regulate the gas but that just resulted in dismal 60' times (2.4X) so then I tried just bringing the clutch close to the friction point and slipping it from about 3000 rpm, that gave me much better 60' times (in the 2.25-2.3 range). As for the shifting I don't powershift, I just shift like I would shift normally. I was shifting at just past 6000 and going through the traps in 3rd at about 6400 rpm


Now for the times I ran consistent mid-13's and was trapping 108 regularly with a high trap speed of 108.7 mph. My best run looked like this:

60':2.25
1/4 ET: 13.60
1/4 mph: 108.7

Keep in mind the track is at sea level but it was pretty humid yesterday. Also they don't really prepare the track very well.

So how can I improve my times? I would like to get some DR's and get those 60 foot times to drop but I'm afraid of breaking the stock rear end. Is there anything else I can do to improve my 60 times? Some people there were telling me that with better 60' times I could be in the 12's with my trap speed is this true?

Also I thought that with my mods I would be trapping closer to 115 mph.. am I expecting too much from my setup? I mean I see people on here trapping close to what I'm trapping with just bolt-ons and a small cam, so with my bigger cam and ported heads shouldn't I be trapping much higher?

And I have a pro 5.0 sitting in my room but haven't gotten around to installing it yet, do you think that would help me with my shifting?

And what other mods could I do to help me reach my objective of getting into the 12's. Will 4.10 gears help me?

Thanks for the help.

Some people there were telling me that with better 60' times I could be in the 12's with my trap speed is this true?

Yes.

It looks like you have a lot of wheel spin off the line. There's no reason to have a 60' time slower than 2.0 especially with a V8. A set of slicks will help with the traction but as you said, your track doesn't do good track prep. Even with slicks, poor track prep can still give poor traction.

Try shifting in the 6,300 to 6,500. I am not sure when the 230/236 peaks but I think it is around 6,200.

Maybe its your driving but that trap seems pretty dam low, times in sig is just bolt on's and my 60' is just a lil better.

I have the same cam as you do.
I also run slicks and I'm not at a sea level track at all. My DA very's from 1800-3200ft

If you get a decent 60' than your ET will drop.

Traction, gears, and some fast shifting will net you a lot better times. Slower shifting = slower times. You need to rip through them like no tomorrow to really get the most out of it. I wouldn't do gears in the 10 bolt, just save up for a 12 bolt or 9 inch.

Your trap speed is there for a low 13, high 12 1/4. I ran 13.05 with a similar trap speed and i know i can launch better. It just takes practice and track prep is huge to. Keep working with it, you'll drop it down.

Thanks for the help so far everybody I really apreciate it.

I would like to shift at 6500 (cutoff) every gear since I know the cam is still pulling at that point, but I don't know how many times my stock bottom end will rev that high before I spin something, so I play it safe and shift at about 6200 in 1rst and 2nd and let it go through the traps in third as it's getting to 6400-6500 RPM.

I know the 60 foot time is killing my ET's. I'd like my car to hook better, but at the same time I don't want to blow my stock rear. If I borrow slicks from a friend and run a few times at the track, and if I don't launch too hard, should I be ok? I'd like to see sub 2.0 60 foot times.

LS1_03 I used to think the same thing about the gears (ie why install 4.10's in the stock 10 bolt... if it goes then it's money wasted...) but I think gears are one of the reasons my car is trapping a bit lower than it should. I mean I would think I should be trapping over 110 mph, however I don't even get into my 1:1 gear throughout the 1/4 mile so maybe if the car could go through the traps in 4th I could see a few more mph?? Also a set of gears don't cost more than 200$ whereas a 12-bolt rear is at least 2000$ :( So I'm thinking of buying a set of 4.10's and having them installed over the winter for next season.

Also 97s10ondubs, you may be right perhaps my car is a little bit down on power and it's not making the power it should. I'm going to dyno my car tomorrow at the same place where I dyno'd my car when it was stock (246 rwhp 308 rwtq) so I will be able to get a good comparison. I guess I will be able to see if the power is lacking.

I would get a set of gears for it for sure. What a differance it makes. It was my best mod by far. It takes 4 gears to get through the quarter though. I paid $400 for the gears, seals, and installation. I have about 15,000 miles on them and haven't had a problem with them yet.

I dyno'd my car yesterday and it does seem to be lacking a bit of power. I made 3 pulls to just past 6000 RPM and the numbers were low 330's rwp and about 370 rwtq. The car was spinning a bit on the dyno. Also I did notice that I was running VERY rich (my car made the dyno operator cry :p and gas was spîtting out from the exhaust) so maybe if I send the PCM back to PCM for less for better tuning he can lean it out a little bit and I could see the 10-15 hp I might be mising. I am actually quite happy with the results as I dyno'd about 90 whp and 60 wtq over what I dyno'd bone stock on the same dyno. I would have really like to see over 350 at the wheels though.

Hopefully during the winter I can put in some 4.10's and get the PCM reprogrammed for that as well and it should help me out a great deal for next season.

Definately add some gears and a sticky tire, even if you just drop to a 2.0 youre in the very low 13 sec range, just imagine if you could pull off a 1.8 or so!!!
The mph does seem slightly low, I'd like to see 110 plus out of that set-up, but it may be your shifting, Some practice on your shift and launch would probably knock a half second off alone, then throw quicker accel from the gears and youre getting there.

If you raced at Napierville ,the track perp is NIL,the track has a 7' drop[strart to end] and tends to give better E.T.s by 1 or 2 10ths than other tracks due to elevation and the fact that it runs night races. :)

Nice times,next year try going to Sanair the track prep is A1 and it gives good consistant times. ;)

Where are you having your work/Dyno done,ZEKE'S?? :D

108.7 mph will support a 12.50 pass with traction.

The dyno numbers look good. That 90hp increase is excellent, way to go!
The dyno numbers match up real well with what we saw when we dynoed my friends car last weekend; it suppots the 108 mph pass.

You need slicks brother, the slicks will get you there.

I went 12.90s spinning plain old street tires (235s) at 109. The car went 12.20s with slicks and a few other changes at 111 mph, next time out.

Do a "broken rearend" search to see how fast other M6 guys are pushing the stock rearends. I can't remember, but I know it's far slower than the A4 guys.

Well, if your spinning on the dyno...they did not properly tie your car down. I have two vehicles that both mak (made) decent power...alot more than what your putting down and have never even had slippage whatsoever.

You should try to log some runs, get an idea of what the car is doing. Some cars like running rich, some don't.

You'll work it out.