New Whipple times, trap speed seems a bit low

[alrodri8]

So I ran at the track last night after installing my whipple last weekend, and pulled off some times. My best time was a 10.68 @ 127.98. I did end up running a 10.69 at 130.62. This was also on 93 octane fuel on a MT82 car with 3.73 rear gears.

Was wondering what could cause my trap speed to be a bit lower than others, it seems the ET is there but I'm wondering if more is left on the table due varying trap speeds. Its a Whipple Stage 2 Calibration. I'm wondering if it may have been fuel quality, and if so which are the gas stations generally have better quality 93. I also may be thinking it may very ue to having to shift into 5th before the end of the quarter mile.

Any tips and advice would also be greatly appreciated.

Best time
60' 1.580
330 4.526
1/8 6.937
MPH 102.41
1000 8.984
1/4 10.689
MPH 127.98

Other time
60' 1.547
330 4.510
1/8 6.922
MPH 102.08
1000 8.974
1/4 10.691
MPH 130.62

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[Burnin4]

those et's are actually really good for the whipple tune, I bet your 3.73's are killing your mph going into 5th gear. Typically whipple tunes have low mph, 128-130 for 700whp+ cars, never seem to match up, but in your case it looks like you are driving the wheels off of it but mph is falling off. Did you take datalogs? That's really the only way to tell what's going on. I'd drop to a 3.31 so you can hold 4th through the traps.

 

[alrodri8]

those et's are actually really good for the whipple tune, I bet your 3.73's are killing your mph going into 5th gear. Typically whipple tunes have low mph, 128-130 for 700whp+ cars, never seem to match up, but in your case it looks like you are driving the wheels off of it but mph is falling off. Did you take datalogs? That's really the only way to tell what's going on. I'd drop to a 3.31 so you can hold 4th through the traps.

I datalogged the 8th mile a few days ago but did not datalog the quarter. I may go back Saturday night with some octane booster and datalog with that to see if it improves. Yeah I think the 5th gear shift is killing me, I am shift into 5th a couple of car lengths before the finish line.

 

[pro 5.0]

Was this with Knock limiting off and octane adjust off ? I agree that 5 th gear through the traps is hurting mph, but it doesn't affect the 1/8 mile which seems low to me. I thought the car would trap in the 135 - 137 range with the stick which would put your 1/8 mph at about 106 mph factoring a 30 mph back half. I could be wrong though good ET though for rowing the gears manually.

 

[alrodri8]

Was this with Knock limiting off and octane adjust off ? I agree that 5 th gear through the traps is hurting mph, but it doesn't affect the 1/8 mile which seems low to me. I thought the car would trap in the 135 - 137 range with the stick which would put your 1/8 mph at about 106 mph factoring a 30 mph back half. I could be wrong though good ET though for rowing the gears manually.

I'll have to check when I'm home. The only thing I did was raise the RPM limiter to 7800. I'm not sure what knock limiting is. And thanks, I try to row gears haha.

 

[pro 5.0]

Octane adjust is set to off by default, the knock limiting is set to on by default. It works off the knock sensors and is used for when you have poor gas or questionable octane, it will monitor knock activity and if seen it will start to close the throttle blade and reduce power until the knock goes away.

 

[alrodri8]

Octane adjust is set to off by default, the knock limiting is set to on by default. It works off the knock sensors and is used for when you have poor gas or questionable octane, it will monitor knock activity and if seen it will start to close the throttle blade and reduce power until the knock goes away.

Sounds dangerous to turn the knock sensors off.

 

[pro 5.0]

Knock sensors will still be active they just won't be as sensitive.

 

[alrodri8]

Knock sensors will still be active they just won't be as sensitive.

Thats good to know. I'll do that tonight! Then test at the track tommorow.

 

[alrodri8]

What about overload limiting and CHT limiting? Is that safe to disable?

 

[pro 5.0]

I would leave the coolant head temp limiting on, if temps climb you want it to pull timing to prevent detonation. The overload limiting is only in affect if you run too small of a pulley and exceed the fuel and air calibration in the tune. If you are running 93 octane only without any octane booster such as Torco or Octanium you SHOULDN'T be running any smaller than a 3.625 pulley.

 

[Kyle0995]

This is how I set up my car with my best pass. Would have been better if I had more passes that night but only got to make one. I was running one can of ms109 and was short shifting at 7k and had to let out twice but resulted in a 10.4@137

 

[alrodri8]

This is how I set up my car with my best pass. Would have been better if I had more passes that night but only got to make one. I was running one can of ms109 and was short shifting at 7k and had to let out twice but resulted in a 10.4@137

Going to try this on the weekend. I just made some setting changes and it feels much better.

 

[alrodri8]

This is how I set up my car with my best pass. Would have been better if I had more passes that night but only got to make one. I was running one can of ms109 and was short shifting at 7k and had to let out twice but resulted in a 10.4@137

I went out this weekend and still ran similar times / traps with the settings set as you did. Why short-shifting? Makes me wonder if i should lower my shift points or something. I still don't understand why my car is trapping so low. What was the temperature when you made that pass?

I'm thinking the whipple tune may be hurting my trap, wondering if i should get a custom tune done.

 

[pro 5.0]

Unfortunately you can't data log with the Whipple software and that is the only way to tell what is going on. Timing could be getting pulled due to knock or high IAT 2 temps thus reducing your horsepower and lowering mph. I would still like to know how Lethal Performance went 9.70 @ 150 mph with the Whipple and the 6 speed manual I know they ran around 20 psi on MS 109 fuel.

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