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Old 09-19-2012, 12:03 PM   #1
idmantis
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Default TIL I have no idea hoe to drive my csr in the 1/4 mile, what am i doing wrong?

Granted it was my very first time at the drag strip ever. I have a 09 WRX coupe with almost every supporting mod except engine internals, running 355wHp @22.3 psi.

Just browsing through the forum I see stock cars same year, body, engine pulling in 12.94 or low 13's with their cars.

Then theres me, heavily modded, 18g turbo and almost an extra 100 horse power than a stock version and my best time was 13.71... Again it was my first time a drag strip racing ever, and my reaction times weren't the best, but I didn't feel I did that bad, until I saw others results here. I was launching 4500-5000 rpm by holding the accelerator until i saw the green then released the clutch. I know I can anticipate the green light for take off instead of waiting until I see it to better r/t, but no idea what's going wrong down the strip that hurts my time so bad...

Just looking for advice to help improve or give me a good idea where to start improving.

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Old 09-19-2012, 12:07 PM   #2
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A couple notes:
  1. Reaction time does not have any affect on ET or MPH.
  2. With a 100MPH trap, you don't have a 350WHP car.
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Old 09-19-2012, 12:17 PM   #3
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Not sure what you mean by 100mph trap? Unless you're referring to my speed I finished at. I did have faster speeds, but this slip reflected the best time. Hence the post, trying to figure out what I'm doing wrong to use it to its full potential. As far as the Whp I can assure you it's 355, the mustang dyno sheet doesn't lie. Which if need be I can post if you really need to see it.
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Old 09-19-2012, 12:23 PM   #4
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stop letting hoes drive your car




































Sorry, could not resist
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Old 09-19-2012, 12:35 PM   #5
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Don't ever dump the clutch, you must feather it. Thinking of launching like a slingshot, load the drivetrain (by being at almost the clutch grab point) and get as much load on the engine/drivetrain as you can; then slip that couple millimiters on the clutch and smash the gas. Hit the rev limiter in 1st and almost second. I need dyno sheets to help you with the rest for shift points. You can also pm me your phone number if u need some explanations (it's wayy too much to type and I help a lot of folks for free, but it's getting rough typing it all, that's my hinderance), we can work on a talk time. (this is open to anyone who wants my help, i'm no pro, but I do know some stuff).

Carmi (aka soon2bblackongold)
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Old 09-19-2012, 12:41 PM   #6
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Quote:
Originally Posted by idmantis View Post
Not sure what you mean by 100mph trap? Unless you're referring to my speed I finished at. I did have faster speeds, but this slip reflected the best time. Hence the post, trying to figure out what I'm doing wrong to use it to its full potential. As far as the Whp I can assure you it's 355, the mustang dyno sheet doesn't lie. Which if need be I can post if you really need to see it.
Yes, trap speed is the MPH that you finished the run at. A true 350WHP car will trap close to 115MPH or higher. 100MPH trap speeds would normally be seen on a sub 300WHP car. The trap speed doesn't vary that much with driver ability (the ET can vary greatly due to launch/shifting/etc). I hate to break it to you, but your 350WHP dyno sheet isn't backed up by actually going fast. Either the dyno was manipulated, or the car is way down on power since then.
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Old 09-19-2012, 12:51 PM   #7
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Quote:
Originally Posted by CatfaceType-R
Don't ever dump the clutch, you must feather it. Thinking of launching like a slingshot, load the drivetrain (by being at almost the clutch grab point) and get as much load on the engine/drivetrain as you can; then slip that couple millimiters on the clutch and smash the gas. Hit the rev limiter in 1st and almost second. I need dyno sheets to help you with the rest for shift points. You can also pm me your phone number if u need some explanations (it's wayy too much to type and I help a lot of folks for free, but it's getting rough typing it all, that's my hinderance), we can work on a talk time. (this is open to anyone who wants my help, i'm no pro, but I do know some stuff).

Carmi (aka soon2bblackongold)
I had the clutch as close to the grab point as I could, I noticed when holding it at the higher rpms it was closer to the floor. Causing me to roll up a little too soon, if I brought my foot off the floor at all it wanted to take off...

As far as the 100mph trap not being consistent for my cars supposed wHp, only thing I can assume caused by my terrible driving. On one of my other time sheets, my speed was 103.55 but I did 13.72. I hate to admit it, but I think I may just be that bad at driving on a drag strip...
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Old 09-19-2012, 01:10 PM   #8
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Not sure how much if any difference it made, but I left traction control on.. Would this make any difference?
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Old 09-19-2012, 01:18 PM   #9
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If you don't have launch control try bliping the throttle. Also I trapped 110 with 240whp so I'd say your no where close to 350whp. Is your graph in shoot out mode?
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Old 09-19-2012, 01:19 PM   #10
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Quote:
Originally Posted by idmantis View Post
Not sure how much if any difference it made, but I left traction control on.. Would this make any difference?
Biggest thing that you must remember, don't race the guy next to you, stay calm and run what you came to run. Rt's don't matter, as another person said in the thread.

Yah, you should have tractional control off. You want some wheel spin.

Turn off all all that stuff..... I have no experience with the subi traction control. My last subaru was an MY04 sti.
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Old 09-19-2012, 01:21 PM   #11
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Quote:
Originally Posted by idmantis View Post
As far as the Whp I can assure you it's 355, the mustang dyno sheet doesn't lie.
Unless you were towing a van behind you, I can assure you, you're car ain't making anything near 355whp. With 355, you could take off in 4th gear and trap higher than 100 MPH
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Old 09-19-2012, 01:29 PM   #12
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I'm actually researching launch control as we speak. I have a custom Cobb tune from my tuner, can launch control be added to this? Or will my whole ecu have to be re written to incorporate this?
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Old 09-19-2012, 01:36 PM   #13
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Quote:
Originally Posted by idmantis View Post
... the mustang dyno sheet doesn't lie...
Dyno's never lie, just the people who set them up.
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Old 09-19-2012, 01:42 PM   #14
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The fix is not launch control, it's not sucking driving. Sorry.

Post a video of you "launching" then rowing through 1-2-3 gears.
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Old 09-19-2012, 01:53 PM   #15
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Quote:
Originally Posted by idmantis View Post
I'm actually researching launch control as we speak. I have a custom Cobb tune from my tuner, can launch control be added to this? Or will my whole ecu have to be re written to incorporate this?
Yes cobbs launch control can be added to any accessport map.

Quote:
Originally Posted by JoeTX View Post
Dyno's never lie, just the people who set them up.
Rather than worrying about what your actual horsepower is let me give you the impressions I've gotten at the two times at the track. They are still fresh in my mind as I head into the dragstrip this weekend.

What Catface says about the clutch is correct. You want to be just below theclutch pickup point so that you can slip the clutch (for the briefest instant) on launch.

You do want your traction control off. It will bog the engine down and you want the wheelspin to keep the engine "on boil" and you let the wheels grab. You should have about a second or so of wheelspin, don't worry your awd will take care of it.

Also you want to have set up flat foot shifting, where you keep the accelerator pedal matted to the floor while you shift. Depending on your shift point will determine where you want FFS set up to.

Shift fast but smoothly.

If you can launch on an upswing of the tach do so. You are building boost at that level and that will help.

There is a lot to gain in the launch and that is the hardest part of drag racing.


Good luck and keep trying.

p.s. watch out for the tranny it is a weak spot in your car.
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Old 09-19-2012, 01:59 PM   #16
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Any tips on settings for the lc/ffs? I can post my sheet when I get home from work if they'll aid in deciding.
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Old 09-19-2012, 03:02 PM   #17
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for a stock turbo up to a 20g on a 2.5lt with a 5spd set the LC to 3600-4000rpm and FFS to 6400-6700. The 18g should hold power up top so use the 6700 for FFS, then use 3800 for the LC. Should get you going good. Slip the clutch carefully, you shouldn't smell burned clutch after the pass.

Were are u located?
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Old 09-19-2012, 03:16 PM   #18
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Cleveland, Ohio area... When I was launching I was holding it around 5k rpm, 3800 seems a bit low, but i have no idea what im doing anyway. What do I need to look for during launches to know how to tweak this accordingly up or down?
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Old 09-19-2012, 03:33 PM   #19
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Quote:
Originally Posted by idmantis View Post
Cleveland, Ohio area... When I was launching I was holding it around 5k rpm, 3800 seems a bit low, but i have no idea what im doing anyway. What do I need to look for during launches to know how to tweak this accordingly up or down?
Ideally you are looking for bogging( car sinks in the front and loses revs as the wheels grip)
or excessive wheelspin as too much revving.
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Old 09-19-2012, 04:02 PM   #20
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How about for ffs?
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Old 09-19-2012, 04:07 PM   #21
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Wow I'm surprise nobody mention the trap speed he making with a 18g
Turbo? his trapping lower than a stock turbo would. If your only traping 103 on a 18g turbo than please talk to your tuner or mechanic to see if your car is working properly. Also you may want to check for boost leaks since that would hurt trap speed a lot. For example I had a boost leak n trapped 103 but once I fixed it I trap 110.
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Old 09-19-2012, 04:13 PM   #22
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He can be trapping low because of the poor driving alone, I see 5-6mph in driving. Still ow, but lets get a solid 2-3 runs to actually compare the hp/mph.
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Old 09-19-2012, 04:19 PM   #23
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Ya, you guys are giving me a little too much credibility for my driving, car runs stellar I just need to learn to drag race it. I've had boost leaks and am very mechanically inclined just no track experience. I understand the lc function that's pretty cut and dry. But the rpm for the ffs has me a bit confused. Say I set it to 6400rpm, that's where I'm supposed to shift each time while leaving the gas mashed or do I shift before? Kind if confused about that part...
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Old 09-19-2012, 04:53 PM   #24
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Dude, unless your driving with the handbrake on, there is no way you could be bad enough to trap 103 with a 355 whp car. No amount of launch control, flat shifting, clutch feathering or clutch dumping is gonna make up the 12 to 15 MPH you are down. Your car ain't right...
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Old 09-19-2012, 05:28 PM   #25
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Well there were a few factors, again not sure each value of significance. I left traction control on, bogged on starting trying to rev high around 5k rpm, and im sure my shifting wasnt as good as it should be. The driver obviously can make a huge difference... I'm just tryin to learn the ropes in this sport.
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