Will the wrong gear ratio in PCM effect performance?
Thread Starter
Joined: Oct 2003
Posts: 1,164
Likes: 2
From: Frankenmuth, MI
Will the wrong gear ratio in PCM effect performance? Well i am just wondering.. my PCM thinks i have 3.70 gears in my car and i only have 3.23's.. would this affect performance in any with with an A4? would the vehicle speed sensor and TPS be confused in anyway due to it thinking its going a different speed? Let me know what you guys think.. it seems it is possible but i'm not sure..
Thanks for any replies!
Thanks for any replies!
yes it'll have a effect on your entire transmission.. its lockup, its shiftpoints... and a few little things, like the fans. your speedo will also be off..
you should have someone flash it with the correct ratio.
BTW, this is NOT advanced tech, and it belongs in the PCM section
you should have someone flash it with the correct ratio.
BTW, this is NOT advanced tech, and it belongs in the PCM section
my car thinks it has 2.73's but I actually have 3.42's...
I drove from oklahoma to washington dc, around DC for 7 months then back to oklahoma and it hasn't hurt anything.... except the speedo, but I will be dead before I lose ownership of this car....
I drove from oklahoma to washington dc, around DC for 7 months then back to oklahoma and it hasn't hurt anything.... except the speedo, but I will be dead before I lose ownership of this car....
Originally Posted by Koncrete
my car thinks it has 2.73's but I actually have 3.42's...
I drove from oklahoma to washington dc, around DC for 7 months then back to oklahoma and it hasn't hurt anything.... except the speedo, but I will be dead before I lose ownership of this car....
I drove from oklahoma to washington dc, around DC for 7 months then back to oklahoma and it hasn't hurt anything.... except the speedo, but I will be dead before I lose ownership of this car....
just because "it hasnt hurt anything" to your knowledge, doesnt mean its working right.
Thread Starter
Joined: Oct 2003
Posts: 1,164
Likes: 2
From: Frankenmuth, MI
yea my concern was whether it would mess with some of the electrical parts of the transmission.. rather than just shift points? I was just wondering.. it seems as if it could be possible!
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TECH Apprentice
Joined: Jan 2002
Posts: 384
Likes: 0
From: Murphy, TX
Originally Posted by gameover
Actually the gear ratio is not used to calculated the vehicle speed for transmission shifts on the LS1.
Thread Starter
Joined: Oct 2003
Posts: 1,164
Likes: 2
From: Frankenmuth, MI
Do you guys think it could effect my performance top end with my transmission in my 1/4 mph? or is that pretty much not really possible? thanks for more info guys!
FormerVendor
Joined: Jan 2003
Posts: 525
Likes: 0
From: Melbourne, Australia
Originally Posted by ToplessTexan
While that may be true for the F-body I don't think it can quite be true for the C5 given it's VSS. Gearing has to be backed out to get to tranny output shaft rates from axle rates.
could you just get your car fixed? i mean really.....I don't mean to be an *** in any way, i really don't. but why don't you get it fixed? instead of writing about it up here.
Unless you are truly wondering if at all in any way shape or form that this could affect you cars performance.
Unless you are truly wondering if at all in any way shape or form that this could affect you cars performance.
Thread Starter
Joined: Oct 2003
Posts: 1,164
Likes: 2
From: Frankenmuth, MI
what are you trying to say? i'm in here trying to figure out my cars problem rather than spending tons of money on something that may not even change anything.. I'm not really mr. big baller.. i just bought a house and don't have money.. so i'm trying to get everything running good without nickel and diming myself to death.. i'm also trying to educate myself about the transmission tuning so i understand what it is doing.. If you have a problem with my post.. then don't post.. or instead maybe you know something i don't and you can post that?
Originally Posted by MrDude_1
just because "it hasnt hurt anything" to your knowledge, doesnt mean its working right.
I agree, but I was just providing a point that as long as he isn't out beating on it then it shouldn't hurt anything......
I should have went a little further in detail
