121.25 MPH trap speed, can that be right?

My2Cents · 11-17-2011, 09:46 PM

Went to the the track last night and was running a consistent trap speed of 103 to 104 mph. On my last run I ran a trap speed of 121 mph. How is that possible? It appears everything else was pretty consistent from run to run. The only thing that I can think of is that I shifted at 6k rpm on that run instead of close to redline like I did on the others. Can that make that big of a difference? I am a beginner in all this drag racing and trying to understand this. I am car #167 on the slips.

Car: 2007 335i w/ Dinan stage 2 tune, Dinan exhaust and K&N drop in filter. Rear tires - 255/35 Hankook V12's. 1/4 of a tank of 96 octane mixed with about 1/8th of a tank of 91.

Track: About sea level (infineon), 60 - 65 degrees.

hotrod182 · 11-17-2011, 09:53 PM

Based on the fact that your 1/8 mile traps are all about the same, I would say that 1/4 mile trap is impossible. Unless you have an extra 150hp suddenly kick in! I have said it again and again, tracks have variances..and this would have been a nice time to have had a Vbox in your car to verify numbers. Possibly the faster cars the can go from 100-130mph in the back half, might be able to sand bag till the 1/8 and accelerate from 83-121mph in the back half. Since you can accelerate more quickly at slower speeds.

RnmEvo9 · 11-17-2011, 09:56 PM

It was just an error on the tracks speed sensor.

Sniz · 11-17-2011, 10:55 PM

Yup, not happening

ToothDoc · 11-17-2011, 10:58 PM

Despite the error, you're doing good with RT. I like the -.001 LOL!!!

My2Cents · 11-17-2011, 11:54 PM

I didn't think that was right. Thanks for confirming that for me guys.

My2Cents · 11-18-2011, 12:00 AM

Quote:

Originally Posted by ToothDoc

Despite the error, you're doing good with RT. I like the -.001 LOL!!!

Thanks. I got to get my 60' times down though.

Q4P · 11-18-2011, 09:33 AM

Yeah, it's an error on the track's part. It's impossible to trap 121 with your mods and it would be very odd to run a 13.4@121 in an N54. This would mean you are spinning off the line like crazy and then the car gets massive top end which this engine just doesn't have. I have seen this in a big turbo supra though.

11-17-2011, 09:46 PM	#1
My2Cents Enlisted Member 3 Rep 37 Posts Drives: 2007 BMW 335i Sedan Join Date: Sep 2010 Location: California, Bay Area iTrader: (0)	121.25 MPH trap speed, can that be right? Went to the the track last night and was running a consistent trap speed of 103 to 104 mph. On my last run I ran a trap speed of 121 mph. How is that possible? It appears everything else was pretty consistent from run to run. The only thing that I can think of is that I shifted at 6k rpm on that run instead of close to redline like I did on the others. Can that make that big of a difference? I am a beginner in all this drag racing and trying to understand this. I am car #167 on the slips. Car: 2007 335i w/ Dinan stage 2 tune, Dinan exhaust and K&N drop in filter. Rear tires - 255/35 Hankook V12's. 1/4 of a tank of 96 octane mixed with about 1/8th of a tank of 91. Track: About sea level (infineon), 60 - 65 degrees. Attached Images
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11-17-2011, 09:53 PM	#2
hotrod182 . 1015 Rep 4,029 Posts Drives: 2023 i4 M50 Join Date: Dec 2006 Location: California iTrader: (0)	Based on the fact that your 1/8 mile traps are all about the same, I would say that 1/4 mile trap is impossible. Unless you have an extra 150hp suddenly kick in! I have said it again and again, tracks have variances..and this would have been a nice time to have had a Vbox in your car to verify numbers. Possibly the faster cars the can go from 100-130mph in the back half, might be able to sand bag till the 1/8 and accelerate from 83-121mph in the back half. Since you can accelerate more quickly at slower speeds. __________________ 2011 Alpine 335d M-Sport 12.34 @ 110.48mph 2019 i3s Terra, 2008 Black 335i Sedan. 11.11@ 129.47 mph 2008 Monaco Blue JB3 2.0 335i Coupe. 11.33 @ 132.77 mph, 60-130mph: 6.95 seconds 2023 i4 M50 11.48 @ 121.56mph, 3.43 0-60 (dragy) Last edited by hotrod182; 11-18-2011 at 12:45 AM..
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11-17-2011, 09:56 PM	#3
RnmEvo9 Banned 252 Rep 1,827 Posts Drives: 2007 335i Join Date: Apr 2011 Location: Pembroke Pines, FL iTrader: (2)	It was just an error on the tracks speed sensor.
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11-17-2011, 10:55 PM	#4
Sniz Lieutenant General 715 Rep 10,584 Posts Drives: e92 335 - gone // e36 M3 turbo Join Date: Mar 2007 Location: Ellicott City, MD iTrader: (1)	Yup, not happening __________________
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11-17-2011, 10:58 PM	#5
ToothDoc Second Lieutenant 5 Rep 241 Posts Drives: 997.2 TTS, CLA 45 AMG Join Date: Aug 2007 Location: Chicagoland iTrader: (0)	Despite the error, you're doing good with RT. I like the -.001 LOL!!!
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11-17-2011, 11:54 PM	#6
My2Cents Enlisted Member 3 Rep 37 Posts Drives: 2007 BMW 335i Sedan Join Date: Sep 2010 Location: California, Bay Area iTrader: (0)	I didn't think that was right. Thanks for confirming that for me guys.
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11-18-2011, 09:33 AM	#8
Q4P Colonel 88 Rep 2,291 Posts Drives: Too Much Join Date: Apr 2011 Location: World iTrader: (0)	Yeah, it's an error on the track's part. It's impossible to trap 121 with your mods and it would be very odd to run a 13.4@121 in an N54. This would mean you are spinning off the line like crazy and then the car gets massive top end which this engine just doesn't have. I have seen this in a big turbo supra though. __________________ 2jZ + RB26 + 4G63 + LS9 + N54 =
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