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Old 08-15-2012, 08:26 AM   #1 (permalink)
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Default Need 1/8 Mile Drag Tips 07 FXT 5MT (Cobb OTS Stage 2)

Looking for tips, I only have access to an 1/8 Mile track locally.

1) During staging I blip the throttle with clutch fully depressed and just past 4K rpm the car tends to drift triggering the light/foul. Can I adjust the clutch as to not engage? Currently I have to use the ebrake to prevent car from rolling which is negatively affecting my reaction time.

2) Just prior to finish line I have to shift into 4th gear, would larger OD tires help me keep 3th? currently running 215/45/17. Wondering if 225/50/17 would lower rpms to avoid the 4th shift. Any online calculators to calculate minimum OD using trans ratios?

3) Air pressure, high, normal or low? Running 37 psi to minimize contact patch and improve ET but I think that's hurting my 60ft times.

Any other tips welcomed, goal is to achieve a 8.5s ET (1/8 Mile) @70F.
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Old 08-15-2012, 11:54 AM   #2 (permalink)
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Interesting post on using ebrake technique during staging.

1/4 Mile questions/help
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Old 08-15-2012, 12:27 PM   #3 (permalink)
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I assume you're rolling forward then?
At my local 1320 I found that the hill hold did a wonderful job of keeping my car in place on the line, but that only works if the staging area has an ever-so-slight rearward slope.
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Old 08-15-2012, 12:33 PM   #4 (permalink)
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track is flat, @0 rpm the car stays, however past 4K rpm as I am building boost, blipping the throttle and clutch fully depressed, car rolls forward as if the clutch would contact the pressure plate slightly.
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Old 08-15-2012, 02:10 PM   #5 (permalink)
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Can't say I was having that issue with mine... and I was launching at only ~3800 rpm because it would try and bog down beyond that.
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Old 08-15-2012, 02:33 PM   #6 (permalink)
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Preloading with the ebrake shouldn't hurt your r/t if you get it down ( i use it with my fwd dsm) try holding it at 4k not blipping it as well.
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Old 08-15-2012, 03:37 PM   #7 (permalink)
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If I understand you correctly, sounds like you have something wrong with your clutch/pressure plate. With the clutch fully depressed, your car shouldn't move regardless of the engine speed, unless the asphalt is not level as said before.
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Old 08-16-2012, 06:05 AM   #8 (permalink)
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^My clutch has rolled forward at high rpm and clutch fully depressed ever since I had warranty work to replace the input shaft slide bearing. I always make sure to push the clutch all the way to the firewall but if I rev at 4K rpm or higher the clutch will engage slighly and move the car slightly. Also, ever since the bearing replacement the pedal is extremely hard to depress...
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Old 08-16-2012, 06:15 AM   #9 (permalink)
 
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You have clutch issues. This is not normal. I can take my 97k mile stock everything 06 and redline it in 1st and it will not move.

The tire diameter is hurting you big time. You are pretty undersized for the Foz specific gearbox, and having 4.44 gears is killing you with those small tires. What speed does your speedo read when crossing the line?

As for tire pressure, it varies depending on what your car like. Take a note book, record tire pressure on each pass, shift points on each pass and what rpm you launch. Play around with all of these and see what works best.

My lgt ran 12's with a dp and stage 2 tune. I would launch at 4500, shift to 2nd at 6k, 3rd at 6200 and 4th at 6200 on my way to a 108 mph trap with 1.80-60' times.
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Old 08-17-2012, 06:42 AM   #10 (permalink)
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Good tips Brian.

My 60ft is 1.88, 1/8 MPH 79, 1/8 ET 8.9 (71F/850ft)

Any online calculators to understand gear ratios vs tire size vs speed? I am now considering taller tires (now 215/45/17), I can not complete the 1/8 in 3rd gear, have to shift into 4th or bounce the rev limiter for a few feet in 3rd just prior to finish line. I would like to increase tire size only one order of magnitude, either 225/45/17 or 215/50/17, perhaps go no taller than 225/50/17, wondering if any of these taller sizings would suffice to complete the 1/8 run in 3rd gear? I hate tall tires though, too much rotational inertia and sidewall flex.

I will look into adjusting the clutch too, I have been using the ebrake to stop the vehicle from creeping forward but it takes away from concentration as I get too ****ing excited during staging, I may have a heart failure one of these days at the strip...

Also the hill-holder is **** up, that is why I could not move into reverse @DGM2012.
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Old 08-17-2012, 06:48 AM   #11 (permalink)
 
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When you stage, let the guy you are racing go and run his race. Sit there for 5 seconds and after he is gone then do your thing. Your reaction time will suck, but that does not affect your 1/8 mile time. The clock does not start until you move.
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Old 08-17-2012, 06:49 AM   #12 (permalink)
 
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I will also see if I can find enough road to max out 3rd gear and see what MPH it is. I think its in the 90's though.
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Old 08-17-2012, 09:22 AM   #13 (permalink)
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You just got practice your preloading on some back roads to get used to it and don't worry about r/t till you get the hang of it...... Or just fix your clutch

On my dsm I get better times by hitting the limiter instead of shifting

Check out some threads/vids on the Evo forums
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Old 08-17-2012, 09:32 AM   #14 (permalink)
 
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Quote:
Originally Posted by plazaxt View Post
You just got practice your preloading on some back roads to get used to it and don't worry about r/t till you get the hang of it...... Or just fix your clutch

On my dsm I get better times by hitting the limiter instead of shifting

Check out some threads/vids on the Evo forums
I also have used no lift shifting and its kinda scary on a Subaru engine.
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Old 08-17-2012, 10:31 AM   #15 (permalink)
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^Are you talking about flat foot shifting?
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