I dont understand the low trap speed

[96A4RS]

Ok so I went to the track down by my house, this is my first time at this track and the second time to ever to run the car. Mods are 3.73s, homemade cai, pacesetters no cat and flowmasters, shift kit, corvette servo, strano/bills.,mail order tune(but with 3.42 gears), Small weight redux(spare tire/jack and back seat and seat belts).

I need help to understand this My times are ok but the mph is low, like by 5 or 6 mph but im running faster than people with similar mods. I know I cant just compare apples to apples, because of DA and other factors, but 5 mph seems like a lot. Anyways here are my two best times.

R/T 1.097
60 ft 2.176
330 ft ??
594ft 8.857
1/8 ET 9.547
1/8 MPH 65.30
(with my girlfriend (115 lbs) in the passenger seat last run of the night A/C off)

R/T 1.159
60 ft 2.204
330 ft ??
?594ft? 8.881
1/8 ET 9.586
1/8 MPH 65.8
with the A/C on(first run of the night and forgot to turn it off)

the outside temps were in the low 80's with a little bit humidity.
Over all the car felt like it had more and I know I does, It runs SO much better in the winter.

[2.8 Bird]

Re: I dont understand the low trap speed

Your runs will be better in cooler weather and without your gf and without ac being on.

[96blackmaro]

Re: I dont understand the low trap speed

I see what you mean, but not sure why your slow by that much. I was pulling a 2.1 60' with a 9.7 1/8th and a trap of 71.

[96A4RS]

Re: I dont understand the low trap speed

Yeah like I said I dont understand it. Maybe someone will chime in with some insight. And I know my et will be lower in colder weather, and also with the a/c off and my gf not in the car. Those two runs were the first and last run of the night, they just happened to be my two best. The other two I spun through first and got a bad time and lower trap.

[bigbrian442]

Re: I dont understand the low trap speed

Perhaps your on the brakes too soon.

[dmw319]

Re: I dont understand the low trap speed

pics of gf or ban..... jk

i agree with big brian, maybe you are braking too soon?

[96A4RS]

Re: I dont understand the low trap speed

I dont know, next time I go i'll look and see where the lights at. But I dont think that is the problem. Would shift points being off hurt that much? Cause I think thats where my problem is.

[12secondv6]

Re: I dont understand the low trap speed

So, you have 3:73's but the car is programed for 3:42's?

If yes, this could be affecting you as the car will shift earlier than it should and would be a factor towards low trap speeds.

I only say this because I experienced it many years ago in my bird

[ssms5411]

Re: I dont understand the low trap speed

Thats gotta be awful on A4, M5 wouldn't matter, but with a auto I'm surpised it hasn't burned something up.

[Bird_Of_Prey]

Re: I dont understand the low trap speed

Yup, that's down some good MPH. At least 5. A/C had no effect on your run. Your A/C clutch disengages over 80% TPS. Let's start by looking at general repair items. When did you last change the fuel filter? Air filter clean? Wheel bearings making any noise? Tire pressures? How much other crap did you have in the car?

[96A4RS]

Re: I dont understand the low trap speed

Well maybe my problem reared its head, a week after the track visit my car starts acting funny. It feels low on power and I feel as tho the exhaust has gotten quieter... I dont know Im goin tomorrow to have the codes read and see whats up, and then I'll try and narrow it down. I'm leaning towards an o2, maf, or spark plug. All my filters are good. Car was cleaned out before going. I'ma try looking in to getting my engine tuned up and dialed in with a better tune and see what happens. I really want at least a 9.3 before the stall. I know this car has it in it, she runs strong