q45 transmission pressure
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jamesmost
- Posts: 1963
- Joined: Tue Jul 08, 2003 10:16 am
- Car: "95Qmodded, Benz wagon 4matic , 1986 MB 560sec
q45 transmission pressure
has anyone had their transmission pressure cranked up. my trans. guy told me he does it in alot of Q's actually all the q's except grandma's special tool cranks pressure from 60 to 80 for firmer shifts
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Q45tech
- Moderator
- Posts: 14296
- Joined: Tue Apr 30, 2002 3:19 am
- Car: 1990 Q45 342,400 miles 22 years ownership with original engine
1995 G20t 5 speed 334,000 miles 16" 2002 wheels - 205/50/16 Sr20ve vvl
Internal line pressure is 65-71 psi at idle in gears, rising UP to 148-159 psi at stall or shift....................sounds smokey to me.
The EXACT line pressure during shifts is a function of the reported ATF temperature and TPS voltage [reduced to 1 of 8 steps] controlling the line pressure solenoid valve.
If you want to try it without changing internals just change ATF to Redline High Temp, the increase viscosity at operating temp will raise the pressure at least to 80 psi idle. Not useful in cold weather.
The EXACT line pressure during shifts is a function of the reported ATF temperature and TPS voltage [reduced to 1 of 8 steps] controlling the line pressure solenoid valve.
If you want to try it without changing internals just change ATF to Redline High Temp, the increase viscosity at operating temp will raise the pressure at least to 80 psi idle. Not useful in cold weather.
