IS F (2008-2014) Discussion topics related to the IS F model

Pretty disappointing 1/4 mile runs

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Old 02-18-18, 07:39 PM
  #16  
WillAP1
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I agree what others have said. Sounds like getting off the line was your biggest problem. I did a 1.89s 60ft in a 450whp S2000 on all season street tires. Lighter and more power but probably similar torque and the tires were **** compared to drag radials... anything above 2 is definitely too far from ideal. I think the general rule of thumb is the time you improve in the 60ft is roughly doubled in the 1/4 mile so by that maybe if you got your 60ft down to 1.8 you could shave off nearly a full second of your 1/4 mile time. Doubt you'll get anything more than speculation on the issue without data logs though. Probably best if you can do some more runs where you can collect data. Even some quick pulls on the street might be enough with proper data logging.

Last edited by WillAP1; 02-18-18 at 07:46 PM.
Old 02-18-18, 08:20 PM
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sc3dreamin
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Yea usually .1 off the 60 is .2 off the 1/4 but there's other factors. It's unlikely for a car to go 12.1 with 109 mph trap speed.
Old 02-18-18, 08:23 PM
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Drok149
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Originally Posted by Joker4096
I was idling in the staging lanes for more than 10 minutes at a time. I didn't do any logging, but I can bet the iats were up there. My techstream computer just decided not to work so I can't check the kclv numbers. With the top end mph, with a perfect run, what do you think would have been the et? Also what are your recommendations on the burnout. I'm still learning that lol. I have kosei k6r rims with NT05R tires .
10+ minutes at idle and your guaranteed to run awful times. What works best for launching is avoid the wet then do a quick burnout then mash gas on second yellow. With your mods and a good kclv number of 20+ and a DA of zero or better you should be around 12.3-12.5 I would think
Old 02-18-18, 09:56 PM
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Sylvan
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Always shut the car off in the staging lanes, did you notice most people push the cars in the lanes? Launching with some rpm is good as well, go find an abandoned back road and experiment with launching.
Old 02-19-18, 05:05 AM
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Drok149
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Originally Posted by Sylvan
Always shut the car off in the staging lanes, did you notice most people push the cars in the lanes? Launching with some rpm is good as well, go find an abandoned back road and experiment with launching.
Our cars don’t launch any better by revving it up it’s been proven by multiple people on here. I’ve hit 1.79 a handful of times with the mash the gas technique. The biggest restriction in my opinion is the torque converter you can hold the rpms all you want it just bogs down off the line.
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Old 02-19-18, 07:20 AM
  #21  
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Originally Posted by Drok149


Our cars don’t launch any better by revving it up it’s been proven by multiple people on here. I’ve hit 1.79 a handful of times with the mash the gas technique. The biggest restriction in my opinion is the torque converter you can hold the rpms all you want it just bogs down off the line.
Usually when you have a tight converter like our cars do from the factory the mashing the gas off idle flashes to converter a bit higher and gets the best 60 out of them so not surprising.
Old 02-19-18, 11:27 PM
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lobuxracer
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Originally Posted by sc3dreamin
Yea usually .1 off the 60 is .2 off the 1/4 but there's other factors. It's unlikely for a car to go 12.1 with 109 mph trap speed.
While your launch is definitely not in the low 12's, a trap speed of 109 says you are not making good power. Trap should be 112 to 114 if you are thinking lowish 12s. Heat soak could be killing you, but you really should do a basic health check on the engine to be sure your rings and valves are sealing well.
Old 02-20-18, 01:04 AM
  #23  
isfvss
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Where is the intake temp sender on the ISF located cheers.
Old 02-20-18, 03:49 AM
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Joker4096
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Originally Posted by isfvss
Where is the intake temp sender on the ISF located cheers.
Its read from the MAF I think.
Old 02-20-18, 03:52 AM
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Originally Posted by lobuxracer
While your launch is definitely not in the low 12's, a trap speed of 109 says you are not making good power. Trap should be 112 to 114 if you are thinking lowish 12s. Heat soak could be killing you, but you really should do a basic health check on the engine to be sure your rings and valves are sealing well.
Thanks for your input, this is also my belief. Do you know the steps to do a compression test on this car? I have a tester but no idea how with the push to start. I've done it on turn key cars before. I'm guessing that I have to pull the fuse for the in tank fuel pump?
Old 02-20-18, 05:53 AM
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Yep, trap speed is a good indicator of power, 109 is pretty weak, probably will need 115+ mph to hit bottom 12s.

Its always hard to figure out whats going on with a car without being able to datalog a bunch of stuff, without that information you are just guessing.
Old 02-20-18, 06:52 AM
  #27  
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Time slips
Old 02-20-18, 06:56 AM
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sc3dreamin
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Def seems on the slower side for a modded F in those conditions.

Maybe try resetting the computer by unplugging the battery and putting a few gallons of race gas or good octane booster in it, keep the hood open to keep the car cool and see if that helps
Old 02-20-18, 06:58 AM
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Yeah its weird. I'm going to do some tests etc. I do a lot of stop and go city driving, daily driving the car. I wonder if that has a bit to do with it. I barely get any full throttle passes anywhere.
Old 02-20-18, 09:56 AM
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At what track was this at? How was the weather? Is the track at high altitude? High humidity is bad for a track day. Perhaps conditions just weren't favorably the day you went to the track.


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