I finally got all the parts for my car on my car. I dynoed it and it gave me 514 rwhp on pump gas, 110 degree weather, and with no tuning at all. The car is Naturally asspirated (NA) with modified heads, rockers, pushrods, racing cam, headers, exhaust, throttle boddies, CF air box, short shifter, and BFG DR on the back. I testing the car on the track 6 times over 3 days (i.e. 2 runs per day). The track prep was got, and my burnouts and great (did not change the tire pressure). The first 2 runs I was not launching the car and only shifting from 1st to 2nd hard all the way through the RPM range. The one thing that is constant on every run is the car is unstable at the top end. The run I put the car in 3rd and crossed the finish line (115 mph) I actually crossed into the other lane in the breaking area, that is how unstable it is. Yesterday I decided to push the car harder, and Ran 12.2 at 117 mph with a 60ft of 2.0. I got off the gas at the finish and the car was really unstable.
Please give me some feedback on the following:
1. Tire pressures (note I use Nitrogen fills)
2. Best was to launch (drop the cluch or slip) I want good 60fts
3. Why the car is unstable??? How can I fix it.
4. What ET and Trap Speed should I be looking for?
I was slipping my clutch on my Pilots and got some good 60ft's. I think I was running 11lbs in the rear and 20 up front on my tires. so what is tha car doing that is making it unstable? does it pull to the right? I know from running wrinkle wall slicks, cars feel a little mushy without the sidewall, but if you are running DR's it shouldn't be too bad. Why would it be so unstable at that speed? My car was just fine coming out at 115mph and I found out the other day, my alignment was all out of wack.
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94' RT/10
12.1 @ 115 (1.87 60ft) on worn Pilots, cone filters and Dynomax w/no cats-406HP/475TQ
no way in hell is this guy going to trap 127-130 with only 514 ish rwhp. NO WAY!!! maybe 121 or 122 tops. i trap 127-131mph with a 150 wet shot nx system in place pushing over 600 to the ground! your cam and head work should have net you over 550 and the fact is, many get those figures with simply bolt-on mods, like headers, full exhaust, smooth tubes, filters etc, tuning. i would tell you that it is unwise to run your car untuned especially after the head and cam swap to at least have the air fuel checked and make sure it isnt out of wack. my guess is that changing the motor like you did had an effect on the a/f ratio. if you cant get back to the dyno to check the a/f then pull some plugs and inspect.
i would also suggest that with a head and cam deal installed you get a vec2 at the very least to change the tune compensating for the swap. this could be where your lack of hp is at!
If a 3150 pound Z06 can run 127 in the quarter with 505 crank, then there is NO reason why a GTS cannot run that high with a bit over 600 HP. Hell, I think Hennessey Venom 600s had traps in the low 130s back in the day.
no way in hell is this guy going to trap 127-130 with only 514 ish rwhp. NO WAY!!! maybe 121 or 122 tops. i trap 127-131mph with a 150 wet shot nx system in place pushing over 600 to the ground! your cam and head work should have net you over 550 and the fact is, many get those figures with simply bolt-on mods, like headers, full exhaust, smooth tubes, filters etc, tuning. i would tell you that it is unwise to run your car untuned especially after the head and cam swap to at least have the air fuel checked and make sure it isnt out of wack. my guess is that changing the motor like you did had an effect on the a/f ratio. if you cant get back to the dyno to check the a/f then pull some plugs and inspect.
A stock GTS will trap 121 with a good driver with almost 100rwhp less.
Yeah those numbers seem low. I was at the track last week on stock pilots from 1999 (OLD and hard) and with NO burnout and stock tire pressure i ran a 12.6 @116 with a 2.3 60ft.
I'm basically stock besides exhaust and tubes.
On the Dyno it showed that I'm running a little lean but not to much. I have ordered AEM and it will be here in a few days. But what I really need is your experience in what I can do to improve the times (driving tips) and stability of the car.
If a 3150 pound Z06 can run 127 in the quarter with 505 crank, then there is NO reason why a GTS cannot run that high with a bit over 600 HP. Hell, I think Hennessey Venom 600s had traps in the low 130s back in the day.
i am not even going to comment on this rediculous statement you made other than you are incorrect and drop it. to trap 127-130 with the weight of a gts, you need a minimum of 575-600 rwhp. this guy already said he is at 514!
I would start the BFG's at about 18psi and the fronts to about 40psi. Since our cars have lots of low end torque revving up to 1500 or so and either slipping or dropping the clutch should be good. if it spins then launch at a lower RPM.
no way in hell is this guy going to trap 127-130 with only 514 ish rwhp. NO WAY!!! maybe 121 or 122 tops. i trap 127-131mph with a 150 wet shot nx system in place pushing over 600 to the ground!
Dunno what you are talking about, as my full weight 538 RWHP 2000 RT/10 (100 shot, VEC2, no cats, minor stuff like that) consistently trapped in the 128-129 range with that setup.
i am not even going to comment on this rediculous statement you made other than you are incorrect and drop it. to trap 127-130 with the weight of a gts, you need a minimum of 575-600 rwhp. this guy already said he is at 514!
You sure about that? Check out some Ford GT times. they weigh right under 3400lbs and are in the low 500rwhp range and i've seen ~127mph traps from them.
My friend with a Ford GT, pulley and tune trapped 133 over the weekend.
Dunno what you are talking about, as my full weight 538 RWHP 2000 RT/10 (100 shot, VEC2, no cats, minor stuff like that) consistently trapped in the 128-129 range with that setup.
You sure about that? Check out some Ford GT times. they weigh right under 3400lbs and are in the low 500rwhp range and i've seen ~127mph traps from them.
My friend with a Ford GT, pulley and tune trapped 133 over the weekend.
I have seen as high as 131 from them stock. The last one hennessey dynoed was 515 rwhp. So, there is NO REASON WHATSOEVER that a 514 RWHP GTS with a good driver, track, and tires cannot lay down 127 in the quarter. To argue any further would be futile.
A SRT runs 123-124 with 450rwhp....what is so hard to believe with 500+rwhp you can't run 127+? Still the 121 with 500rwhp is ridiculous. Sounds like driving lessons are in order if that is all the car is going.
I finally got all the parts for my car on my car. I dynoed it and it gave me 514 rwhp on pump gas, 110 degree weather, and with no tuning at all. The car is Naturally asspirated (NA) with modified heads, rockers, pushrods, racing cam, headers, exhaust, throttle boddies, CF air box, short shifter, and BFG DR on the back. I testing the car on the track 6 times over 3 days (i.e. 2 runs per day). The track prep was got, and my burnouts and great (did not change the tire pressure). The first 2 runs I was not launching the car and only shifting from 1st to 2nd hard all the way through the RPM range. The one thing that is constant on every run is the car is unstable at the top end. The run I put the car in 3rd and crossed the finish line (115 mph) I actually crossed into the other lane in the breaking area, that is how unstable it is. Yesterday I decided to push the car harder, and Ran 12.2 at 117 mph with a 60ft of 2.0. I got off the gas at the finish and the car was really unstable.
Please give me some feedback on the following:
1. Tire pressures (note I use Nitrogen fills)
2. Best was to launch (drop the cluch or slip) I want good 60fts
3. Why the car is unstable??? How can I fix it.
4. What ET and Trap Speed should I be looking for?
Thanks
I think ' WANTED ' would be the best guy to ask re: the best way to get the car down the track.
To my knowledge he's found the best combination to obtain the best times with what you have.
other than you are incorrect and drop it. to trap 127-130 with the weight of a gts, you need a minimum of 575-600 rwhp. this guy already said he is at 514!
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