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Old 12-11-2008, 01:57 AM   #1
BlackC4rb0n
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Member#: 197197
Join Date: Dec 2008
Chapter/Region: SCIC
Location: THE WEST
Vehicle:
2007 WRX
cum

Default taking off on ramps v.boost lag? etc

hey guys,
have a question about when i take off on ramps.
when i shift 1->2 the car would stop or not gain speed until i am in second and from 2-3-4, [by stop i mean it waits until i am in gear, i guess my gear changes are rough] my boost gauge reads +5-10 psi yet the car does NOT pull. This is usually when i am going on a ramp that is either a little upslope or flat. not the case when im going downhill. I dont think i have a boost leak or anything like that. my set up is stock with just a cbe. but i have noticed this twice. Its just annoying when im boosting 10psi and not moving. anyone know whats going on. thanks
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Old 12-11-2008, 02:09 AM   #2
Jubert69
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Join Date: Dec 2007
Chapter/Region: Tri-State
Location: CT
Vehicle:
04 WRX
ej207 spec C 18g

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Get a tune, then report results. I don't know how good/bad the stock maps are but give it a try, or stage 2 and see if you are satisfied with the results.
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Old 12-11-2008, 02:22 AM   #3
BlackC4rb0n
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Quote:
Originally Posted by Jubert69 View Post
Get a tune, then report results. I don't know how good/bad the stock maps are but give it a try, or stage 2 and see if you are satisfied with the results.
do you think stage 2 off the shelf map will make a difference in pulls?
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Old 12-11-2008, 06:45 AM   #4
knockknockknock
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Join Date: Jun 2007
Location: potown ny
Vehicle:
2007 wrx tr
smurf blue

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Quote:
Originally Posted by BlackC4rb0n View Post
when i shift 1->2 the car would stop or not gain speed until i am in second and from 2-3-4, [by stop i mean it waits until i am in gear, i guess my gear changes are rough]
I am going to assume inexperience, if I am wrong you can ignore this post.

If you are accelerating hard, when you shift from 1->2, it is normal to feel the car no longer accelerating. The harder you are accelerating and the longer you take to shift, increases this feeling. This is because our cars accelerate really fast in 1st, then when you push in the clutch, the acceleration rate almost instantly drops to 0 (no longer any power to the wheels). If you are on an incline, you may even start decelerating.

You can lessen the duration and feel by shifting faster. But be warned, the fastest shifting techniques (eg. flatfoot/power shifting) will put stress on your drivetrain. There are instructions/links somewheres in the sticky topics above someplace, on how to do a speed shift properly, which puts less strain on your drivetrain. My definition of a speed shift, is where you lift off the throttle just enough to drop your rpms to match the next gear you are shifting into, and then rolling back into the throttle as the clutch engages.

One final warning, if you are going to try to learn how to shift faster. When you are shifting in the higher rpms, and you mess up or force a shift, you can strain your drivetrain (because of the high hp/tq at those rpms). If you goof on a shift or things arent' right, leave the clutch in, drop your rpms, shift to the appropriate gear for your speed, and do a normal shift. Then try again next time.

PS. I don't race my 07 wrx, but my guess would be that the best shift points are probably somewhere around 5500rpm.
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