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Old 05-27-2004, 11:05 PM   #1
97itr153
Scooby Newbie
 
Member#: 17887
Join Date: Apr 2002
Location: Minneapolis
Vehicle:
05 LGTW Ltd AT
05 Evo RS

Default Test for Turbo-Lag, Downshift-Lag & Low-End

Here are some practical ways of estimating Turbo-Lag, Downshift-Lag and Low-End, Off-Boost acceleration in both automatics as well as manuals:

Turbo-Lag and Downshift-Lag Test:
1. Keep car in second gear
2. Measure the 40-60mph interval from a roll (i.e. start accelerating from 30mph but TIME the 40-60mph interval)
3. Now repeat step 2, only this time start from 40mph and time the same 40-60mph interval.
4. Now repeat step 3 only this time keep your transmission in "D"
The time difference between 2 & 3 will indicate how much Lag (mainly Turbo-Lag) the car has.
The time difference between 3 & 4 will indicate how much Downshift-Lag the car has.

Low-End, Off-Boost Acceleration Test:
In 2nd gear, time the interval from 10-25 mph to measure how you car responds before your turbo kicks in. I picked 10mph because it's the first marking on the speedometer, and I picked 25 mph because most turbocharged Subarus start to build boost after that speed in second gear. I picked 2nd gear because my automatic WRX cannot be forced to stay in 3rd and 4th. 2nd makes it easier to perform this test on both manual and automatic cars. Do NOT use brake-torque for this test.

P.S. Please post your results here and be sure to make a note of the Temperature and Humidity at the time of the tests. Have fun!
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Last edited by 97itr153; 05-31-2004 at 01:57 PM.
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Old 05-28-2004, 12:11 AM   #2
bunni
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Join Date: Aug 2003
Chapter/Region: SCIC
Default

I'd love to - where's 'D' on the 5 speed?

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Old 05-28-2004, 01:37 AM   #3
Uncle Scotty
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OK buy Nates beans
westcoastroasting.com

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Old 05-28-2004, 01:40 AM   #4
volkl23
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Join Date: Jun 2003
Chapter/Region: MWSOC
Location: St. Louis MO
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2004 WRX STi
Java Black Pearl

Default

I'm new to this... where's D on the six speed?
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Old 05-28-2004, 02:12 AM   #5
XS_WRX
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Join Date: May 2004
Chapter/Region: South East
Location: Miami
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2004 Subaru WRX
cammed,built,35R'd WRSTi

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Quote:
Originally posted by bunni
I'd love to - where's 'D' on the 5 speed?

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Old 05-28-2004, 09:13 AM   #6
Mike Wevrick
RIP 1/19/64 - 7/23/11
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Location: saraseager.com
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1957 Taggart Comet
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Old 05-28-2004, 08:07 PM   #7
Trip McNealy
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Join Date: May 2003
Chapter/Region: Tri-State
Location: New Jersey
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2007 Legacy 2.5 GT
2009 Daytona 675

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Quote:
Originally posted by Uncle Scotty
exactly.
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Old 05-28-2004, 08:26 PM   #8
Butt Dyno
Street's closed, pizza boy
 
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Chapter/Region: MAIC
Location: Why do they always say the Evo
Vehicle:
is the "dark side"
06 Evo #7 STU, 03 IS300

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2 tests I've actually seen used before are 5-60 acceleration and 30-50 in 5th gear...

john
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Old 05-28-2004, 09:16 PM   #9
thesmokingman
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Member#: 17751
Join Date: Apr 2002
Location: I want to believe...
Vehicle:
2002 WRX Wagon
944 Turbo track

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Quote:
Originally posted by Uncle Scotty
What he said...
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Old 05-28-2004, 10:31 PM   #10
firecordz
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Member#: 58901
Join Date: Apr 2004
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sold my wrx :(
and moved to japan :)

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'D' on the 5spd is up the alphabet a bit from 'R' but after the numbers
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Old 05-28-2004, 10:54 PM   #11
subiekid
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Chapter/Region: NWIC
Location: Send help, stuck in internet!
Vehicle:
1995 Legacy TURBO!!!
EJ22T/TEC3 & '12 Civic

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Quote:
Originally posted by firecordz
'D' on the 5spd is up the alphabet a bit from 'R' but after the numbers
hahaaha
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