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Old 04-22-2013, 01:28 PM   #1
Scooby Newbie
Member#: 282543
Join Date: May 2011
Chapter/Region: SCIC
Location: 29 Palms, Ca/ Chicago, IL
08 STi

Default 425whp 1/4mile

I am very curious as to what gear I would be at end at the end of a 1/4 mile. I hit 425 whp on a dyno jet with 20gxt-r on e85 anyone with similar numbers can give me a hint? Also what times would I be looking at?
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Old 04-22-2013, 02:03 PM   #2
Scooby Specialist
Member#: 335445
Join Date: Oct 2012
Chapter/Region: MAIC
Location: Ashland, VA
Stg. 2 - 287whp/317wtq.


You will get 50 answers, none of which will be at all accurate due to many factors such as weather, track conditions, ect.

Try this....
Click to View Search Results for 1/4 mile calculator - Google Search 1/4 mile calculator - Google Search

As for gears, very likely 4th in a wrx, 5th in an STi.
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Old 04-23-2013, 09:05 PM   #3
Scooby Specialist
Member#: 68647
Join Date: Aug 2004
Chapter/Region: MAIC
Location: Richmond, VA
07 STI 35R


Your answers will come from experience. Need to find the line between power falling off at high rpm while maximizing gearing. A dyno plot would help to visualize your powerband.
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Old 04-23-2013, 09:34 PM   #4
Scooby Newbie
Member#: 330000
Join Date: Aug 2012
Chapter/Region: NWIC
Location: Seattle, WA
05 LGT Wagon


Shoot for 12's with a solid 60'. Throw in launch control,ffs, cool day, sea level, with 425hp and a solid launch 11.4 maybe. I'm reaching here. Just go run then post!
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Old 04-23-2013, 09:35 PM   #5
Scooby Specialist
Member#: 132587
Join Date: Nov 2006
Location: Lincoln, NE
2006 JrTuned STi


4th gear.
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Old 04-25-2013, 03:05 AM   #6
Scooby Guru
Member#: 64908
Join Date: Jun 2004
Chapter/Region: Tri-State
Location: Tuning 8/9sec Subies @ P&L
10.8 XT+10.0@143 GR+
2x9.0@170mph GTRs


Depending on the tire size you are running you may get away with 4th. If you have a short tire with the 20g you are better off shifting into 5th and using the TQ/Hp curve.

You have power to go deep into the 11s at 118-122mph. With some driving and a good wheel/tire combo that can keep you in 4th you might see 124mph traps and 11.20s
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