Need 1/8 Mile Drag Tips 07 FXT 5MT Stage 2) - Subaru Forester Owners Forum
User Tag List

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
post #1 of 46 (permalink) Old 08-15-2012, 09:26 AM Thread Starter
Forum Member
 
el Fox beSTIal's Avatar
 
Join Date: Jun 2008
Location: Nashboringville, TN
Posts: 1,566
Car Year: 2007
Car Model: XT - 5MT
Transmission: ELH, EWG, E85, Kinugawa TD06SL 20G 8cm
Gallery: 0
Feedback Score: 2 reviews
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.

Last edited by el Fox beSTIal; 08-15-2012 at 12:58 PM.
el Fox beSTIal is offline  
Sponsored Links
Advertisement
 
post #2 of 46 (permalink) Old 08-15-2012, 12:54 PM Thread Starter
Forum Member
 
el Fox beSTIal's Avatar
 
Join Date: Jun 2008
Location: Nashboringville, TN
Posts: 1,566
Car Year: 2007
Car Model: XT - 5MT
Transmission: ELH, EWG, E85, Kinugawa TD06SL 20G 8cm
Gallery: 0
Feedback Score: 2 reviews
Interesting post on using ebrake technique during staging.

1/4 Mile questions/help
el Fox beSTIal is offline  
post #3 of 46 (permalink) Old 08-15-2012, 01:27 PM
ɹoʇɐɹǝpoɯ ɹǝdns
 
Duderotomy's Avatar
 
Join Date: Aug 2008
Location: ナイアガラ
Posts: 20,392
Car Year: 2007
Car Model: XT Sport
Transmission: 5MT
Gallery: 0
Garage
Feedback Score: 19 reviews
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.

Duderotomy is offline  
post #4 of 46 (permalink) Old 08-15-2012, 01:33 PM Thread Starter
Forum Member
 
el Fox beSTIal's Avatar
 
Join Date: Jun 2008
Location: Nashboringville, TN
Posts: 1,566
Car Year: 2007
Car Model: XT - 5MT
Transmission: ELH, EWG, E85, Kinugawa TD06SL 20G 8cm
Gallery: 0
Feedback Score: 2 reviews
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.

Last edited by el Fox beSTIal; 08-15-2012 at 01:44 PM.
el Fox beSTIal is offline  
post #5 of 46 (permalink) Old 08-15-2012, 03:10 PM
ɹoʇɐɹǝpoɯ ɹǝdns
 
Duderotomy's Avatar
 
Join Date: Aug 2008
Location: ナイアガラ
Posts: 20,392
Car Year: 2007
Car Model: XT Sport
Transmission: 5MT
Gallery: 0
Garage
Feedback Score: 19 reviews
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.

Duderotomy is offline  
post #6 of 46 (permalink) Old 08-15-2012, 03:33 PM
Forum Member
 
plazaxt's Avatar
 
Join Date: Mar 2007
Location: GRASS valley, ca
Posts: 827
Car Year: 2006
Car Model: forester xt
Transmission: 5speed
Gallery: 1
Feedback Score: 0 reviews
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.

2006 XT5spd
1995 GST 6bolt
79 RX7
94 fzj80
plazaxt is offline  
post #7 of 46 (permalink) Old 08-15-2012, 04:37 PM
Forum Member
 
wakeabyss's Avatar
 
Join Date: Mar 2007
Location: Boise, Idaho
Posts: 2,885
Car Year: 2005
Car Model: Sequoia, V70R
Transmission: auto
Gallery: 0
Feedback Score: 13 reviews
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.
wakeabyss is offline  
post #8 of 46 (permalink) Old 08-16-2012, 07:05 AM Thread Starter
Forum Member
 
el Fox beSTIal's Avatar
 
Join Date: Jun 2008
Location: Nashboringville, TN
Posts: 1,566
Car Year: 2007
Car Model: XT - 5MT
Transmission: ELH, EWG, E85, Kinugawa TD06SL 20G 8cm
Gallery: 0
Feedback Score: 2 reviews
^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...
el Fox beSTIal is offline  
post #9 of 46 (permalink) Old 08-16-2012, 07:15 AM
 
Tuned200's Avatar
 
Join Date: Jan 2008
Location: Florence, KY
Posts: 21,693
Car Year: 2007
Car Model: FSXT / FSTI
Transmission: 4EAT / 6 MT
Gallery: 2
Garage
Feedback Score: 60 reviews
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.

2007 Forester STI - The Gray Goose
2007 XT Sport 4EAT - Maverick
2006 Forester XT -Sold- Blu-Blur
2010 Forester X - Sold-The Green Goblin
Tuned200 is offline  
post #10 of 46 (permalink) Old 08-17-2012, 07:42 AM Thread Starter
Forum Member
 
el Fox beSTIal's Avatar
 
Join Date: Jun 2008
Location: Nashboringville, TN
Posts: 1,566
Car Year: 2007
Car Model: XT - 5MT
Transmission: ELH, EWG, E85, Kinugawa TD06SL 20G 8cm
Gallery: 0
Feedback Score: 2 reviews
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.

Last edited by el Fox beSTIal; 08-17-2012 at 08:05 AM.
el Fox beSTIal is offline  
post #11 of 46 (permalink) Old 08-17-2012, 07:48 AM
 
Tuned200's Avatar
 
Join Date: Jan 2008
Location: Florence, KY
Posts: 21,693
Car Year: 2007
Car Model: FSXT / FSTI
Transmission: 4EAT / 6 MT
Gallery: 2
Garage
Feedback Score: 60 reviews
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.

2007 Forester STI - The Gray Goose
2007 XT Sport 4EAT - Maverick
2006 Forester XT -Sold- Blu-Blur
2010 Forester X - Sold-The Green Goblin
Tuned200 is offline  
post #12 of 46 (permalink) Old 08-17-2012, 07:49 AM
 
Tuned200's Avatar
 
Join Date: Jan 2008
Location: Florence, KY
Posts: 21,693
Car Year: 2007
Car Model: FSXT / FSTI
Transmission: 4EAT / 6 MT
Gallery: 2
Garage
Feedback Score: 60 reviews
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.

2007 Forester STI - The Gray Goose
2007 XT Sport 4EAT - Maverick
2006 Forester XT -Sold- Blu-Blur
2010 Forester X - Sold-The Green Goblin
Tuned200 is offline  
post #13 of 46 (permalink) Old 08-17-2012, 10:22 AM
Forum Member
 
plazaxt's Avatar
 
Join Date: Mar 2007
Location: GRASS valley, ca
Posts: 827
Car Year: 2006
Car Model: forester xt
Transmission: 5speed
Gallery: 1
Feedback Score: 0 reviews
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

2006 XT5spd
1995 GST 6bolt
79 RX7
94 fzj80
plazaxt is offline  
post #14 of 46 (permalink) Old 08-17-2012, 10:32 AM
 
Tuned200's Avatar
 
Join Date: Jan 2008
Location: Florence, KY
Posts: 21,693
Car Year: 2007
Car Model: FSXT / FSTI
Transmission: 4EAT / 6 MT
Gallery: 2
Garage
Feedback Score: 60 reviews
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.

2007 Forester STI - The Gray Goose
2007 XT Sport 4EAT - Maverick
2006 Forester XT -Sold- Blu-Blur
2010 Forester X - Sold-The Green Goblin
Tuned200 is offline  
post #15 of 46 (permalink) Old 08-17-2012, 11:31 AM Thread Starter
Forum Member
 
el Fox beSTIal's Avatar
 
Join Date: Jun 2008
Location: Nashboringville, TN
Posts: 1,566
Car Year: 2007
Car Model: XT - 5MT
Transmission: ELH, EWG, E85, Kinugawa TD06SL 20G 8cm
Gallery: 0
Feedback Score: 2 reviews
^Are you talking about flat foot shifting?
el Fox beSTIal is offline  
Sponsored Links
Advertisement
 
Reply

  Subaru Forester Owners Forum > General Forums > Motorsports

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Subaru Forester Owners Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools Search this Thread
Show Printable Version Show Printable Version
Email this Page Email this Page
Search this Thread:

Advanced Search
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome