Rypper1

Viking,
My only mods are JLT II CAI and EVO 93 Octane tune. First time I went the air was "bad", hot and wet 85 degrees and 90% humidity.
My best run was:

2.058 - 60 ft
8.854@81.61 - 1/8 mile
13.619@103.52 - 1/4 mile
I had problems all night hooking up and was launching about 1200 rpm. If I launched at 2000 I would get a good bit of spin and have a 2.15-2.20 60 foot. All of this was on stock air pressures.

The last time I went to the track I could not get within a tenth of that time and stayed in the 13.7's pretty much all night. The air was much better and I lowered my rear tires to 22 psi. I seemed to hook up better and launched higher (about 2000) but could not match the 60' or 1/4 time. I did let the car wind out more on the last few runs to see if I could get the times down but it did not seem to help that night. I even took it to 6500, didn't feel the car fall off but I ran a 13.8 that run. Not sure if it was due to the high r's or something else.

I don't have a cure for you except to say go back and try it again. What tune are you running? Oh, and I never shift into 4th, usually go through the traps right at 6K in 3rd. That may change, I have some 4.10's coming this week.

Randy

cableguymicah

I have seen stock GT's run mid 13's.

I ran 13.5's when I was stock in my n/a saleen but Ihave 3.73 gears (or I did before I went to 4.10) and I had 30 more hp and I ran 13.5 so though the average driver should hit 13.6-13.8.

So no I dont think everyone is lying

Daniel60

Laugh but I don't want to know my numbers because I sure the hell don't want to be disappointed.

viking396

Agreed it might be lean although I've heard no ping or any detonation, I have a call out to Demolet to see what he says, I'd prefer to have it tuned by a pro rather than use a canned tune at this point. As to the 6500 shift point, if people say this is possible then when my tune is set properly I'll give it a go.

viking396

I just got off the phone with a buddy that went there after I did and he claims he and many others were off by more than a few tenths so possibly I just over-reacted. I was expecting more and who knows maybe due to my experience I held back shifting so high at this point I'm second guessing everything. On the street the car feels so much stronger than it did that day at the track.

Also, if I seem a bit combative guys I apologize, I'm used to being the one to help others figure out why they aren't getting the ET's they expected, I've never had a car perform under my expectations but heck, I keep hearing nail her to over 6k so after I confirm the tune today I'm taking that SOB to the track tomorrow and shifting at minimum 6300 and keeping her in 3rd through the traps.

viking396

We'll see what I get out of her tomorrow night, I'm praying the weather holds up.

Fly

Your processor may be sensing the knock before it becomes audible to you, and pulling the timing. Stay at it, you'll get there. Frustration's a b*tch isn't it? Good luck to you.

viking396

Agreed, thanks for your help.

chevykiller

I read through all the posts and their were some very good points. Whether you have stock gears, 3.73, or 4.10's, etc. your car should be running through the traps at maximum RPM range. On the stock gears, you should be running through the traps at almost redline in 3rd. With me and current 4.10's, I'm hitting the traps at around 6600 rpm in 4th.

Taking a look at your slips (thanks for providing them it helped a lot) I'm convinced your shift points are playing a major role. I think your damage is done by the 1/8th. Your 1/8 times are slow IMO and should be in the 81-86 mph range. Passing the 1/8 in the high 70's is already setting you up to play 'catch-up' down the rest of the track. I have talked before about the 'torque nanny' and I think this is coming to play with you as well. To recap what it is...

There is a program within the computer that is linked to your rev limiter. To ease the stress on the motor of the rev limiter engaging, the car slightly pulls timing just before the rev limiter is engaged (about 200-300 rpm before) it is not audible or noticable, but does pull your power. If you are shifting very close to the rev limiter, you will expereince this 'early peak out' even if you don't bump the limiter. The solution to this is not to go crazy with your limiter but to set it around 400 rpm over your maximum shift point. This way, you are always shifting before the program is engaged. i.e. if you plan to shift at 6500 rpm, set your limiter for 7000. Early on I had a similiar problem and it was Justin at JPC who turned me on to the rev limiter adjustments and it helped a lot.

Despite this info, it is still a matter of you're not getting the peak out of your car by the 1/8. My guess is that slight spin at the line is costing you and your starting 2nd gear a little lower RPM than is optimal. Then I think you're shifting just a little early at 3rd because of your low rpm 2nd shift. Ideally, you want to make all your shifts in your peak power range and getting a little spin off the line is enough to throw everything off. Try launching at a point where you get no spin (or the smallest) and bang 2nd around 6200-6300. I don't actually agree with those telling you to shift at 6500. If you're making peak power at 6200, that's where you want to shift and you know that. Getting a dyno is imperative at the very least just to be able to see where your peak curve is. I personally think 6500 will be high for your set-up and think you'll find your shift points are going to be in the 6200-6400 rpm range. But I don't know your car so it could be as high as 6600 but we won't know without the dyno, ya know? Either way, the main point is that 1-2 shift and getting off the line better. As I said, forget about concentrating on the whole track, the damage is being done by the 1/8. Keep focused on that and work on getting your mph up there and the rest is just the 'ride'.

viking396

Agreed, but since it felt flat at 6k I felt a shift to 4th was needed, perhaps the tune has an issue since all gears felt flat over 6k and 3rd fell flat at about 5800.

Agreed, and I think a retune and perhaps even a gallon or two of 99 octane to insure no ping will be present for the computer to pull back timing on me. I’m actually thinking of buying a Bamachips tune for my Tunable Induction CAI, what do you think?

Now this is excellent info! I’ll adjust this in the SCT myself and while I’m at it turn off the traction control (yes, it was off while racing).

I honestly shifted at 6k because that’s where it felt strongest, I’ve been wrong before and I’ll be wrong again so I’m going to adjust for this after the re-tune. As for tire spin, the first run had some, actually more in second gear than in first but the second and third passes had very very little spin so I’ll of course work on launch, it would be nice to get a 2.0 60 foot and I’ll up the shift points to 6300 and I’ll leave it in 3rd instead of nailing 4th.

Thanks everybody for your input, now we’ll see how it does tomorrow weather permitting!