1st gear start

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Scorpius01
Posts: 12
Joined: Sun Mar 24, 2024 9:21 pm
Car: 90 Infiniti Q45

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Ideally 93 seems to be the year for TCM to get, however it does not exist. I procured a 94….which any 93-95 TCM technically all work, but the shift points are high on 94-95. Bounces off the rev limiter, adjusting the TPS almost eliminates this just don’t have enough adjustment.
Going to try a potentiometer on the TCM TPS input to see if I can dial this in a little more.
1st gear start transforms these cars!


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Q451990
Moderator
Posts: 11030
Joined: Tue Jul 23, 2002 8:21 am
Car: 1990 Q45 - 118K, 2022 Toyota 4 Runner, 2004 Frontier M/T - 108K, 2012 Xterra (Mom's), 2023 Rogue (Inlaws)
Location: Columbia, SC
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Yeah seriously. I recently had one fail, so I'm on my last 93 TCU. It was a short run that year anyway, so that doesn't help either.

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BCC93QT
Posts: 1385
Joined: Tue Feb 12, 2008 3:20 am
Car: 1990 Infiniti Q45
1995 Infiniti Q45
Location: Western MA

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I gathered a few TCMs... one from my 93... I always loved the rev limiter on my 94...

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BCC93QT
Posts: 1385
Joined: Tue Feb 12, 2008 3:20 am
Car: 1990 Infiniti Q45
1995 Infiniti Q45
Location: Western MA

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Honestly. The 1st gear start tcm doesn't really do much. I dont drive this car much but when I do Im always redlining it with the 4 speed

Ryantzer
Posts: 259
Joined: Sun Aug 11, 2013 5:37 pm
Car: 1990 Infiniti Q45
Location: Phoenix, AZ

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You must be really on it in order to redline it - foot to the floor in my '90 with a '93 TCM and the 1-2 shift happens at 50 mph, and the 2-3 shift happens at 92 mph. I've always felt like a shorter differential gear set would really wake up the car.

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BCC93QT
Posts: 1385
Joined: Tue Feb 12, 2008 3:20 am
Car: 1990 Infiniti Q45
1995 Infiniti Q45
Location: Western MA

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I use the stick most of the time.


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