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Old 10-10-2009, 05:20 PM   #1
FASTEDDIE Z
 
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Unhappy I know why my car is slow

Ive been a little disappointed with the "off the line " performance on my LS1 .I thought I had 3:23's because of the "1" on the gear indicator ,,I was wrong . Its a GU2 code (2:73's) .But Im actually happy about it . This explains a lot . Now Ive got to order a set of 3:73's and wake this thing up .

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Old 10-10-2009, 10:05 PM   #2
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I thought all the cars w/ the "1" on the indicator were 323 cars...
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Old 10-10-2009, 11:59 PM   #3
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strange to hear..I feel the off the line performance in my SS is incredible for a dam near stock car. Maybe the 6 speed gives it a different feel?
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Old 10-11-2009, 02:18 AM   #4
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Originally Posted by njbadaSS View Post
strange to hear..I feel the off the line performance in my SS is incredible for a dam near stock car. Maybe the 6 speed gives it a different feel?

Yes it does.

My 2.73 geared LS1 felt like a dog to a 3.23 LS1... both auto cars.
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Old 10-11-2009, 02:52 AM   #5
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yeah six speeds come with like a 3:4x gear ratio stock. i had no problems with my 2:73 geared autos that i had getting off the line. the six speed does pull noticably harder....but those 2:73 cars are nasty on the highway
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Old 10-11-2009, 08:59 AM   #6
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Originally Posted by MonmouthCtyAntz View Post
I thought all the cars w/ the "1" on the indicator were 323 cars...
Thats what I thought .But at speeds over 30 mph my car will kickdown into 1st when I stomp it . I figured something was up . So I checked the build code . GU2
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Old 10-11-2009, 11:02 AM   #7
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Originally Posted by Eddie D. View Post
Ive been a little disappointed with the "off the line " performance on my LS1 .I thought I had 3:23's because of the "1" on the gear indicator ,,I was wrong . Its a GU2 code (2:73's) .But Im actually happy about it . This explains a lot . Now Ive got to order a set of 3:73's and wake this thing up .

LT1 cars maybe... my 99 Z28 has 1,2,3,D, with 2.73's.
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Old 10-11-2009, 11:04 AM   #8
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my 98's got 1,2,3,D.. was stock with 2:73's, now ive got 3:42's... before u upgrade make sure u get the correct gears for a series 2 carrier, i made the mistake of finding a good deal only to find out they were for a series 3
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Old 10-11-2009, 11:08 AM   #9
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you can tell by looking at the sticker on the inside of the door GU2=2.73 GU5=3.23 GU6=3.42
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Old 10-11-2009, 03:19 PM   #10
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Quote:
Originally Posted by Eddie D. View Post
Ive been a little disappointed with the "off the line " performance on my LS1 .I thought I had 3:23's because of the "1" on the gear indicator ,,I was wrong . Its a GU2 code (2:73's) .But Im actually happy about it . This explains a lot . Now Ive got to order a set of 3:73's and wake this thing up .
3.73s will definately wake it up alot i remember when i put mine in....had a lot of fun with my car that day
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Old 10-11-2009, 04:36 PM   #11
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Yea the gearing definately makes a huge differance. I remember when I had my 97z I test drove 2 new 98 TA's to find out what the whole houpla was w/ this new LS1 lol. One was a 323 car and it felt great....the other was a 273 and I couldnt believe what a dog it was down low...I was comming from a stalled/gear'd LT1 but still....Definately throw some 373's in there and it'll be a whole new car
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Old 10-31-2009, 08:22 PM   #12
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Originally Posted by MonmouthCtyAntz View Post
Yea the gearing definately makes a huge differance. I remember when I had my 97z I test drove 2 new 98 TA's to find out what the whole houpla was w/ this new LS1 lol. One was a 323 car and it felt great....the other was a 273 and I couldnt believe what a dog it was down low...I was comming from a stalled/gear'd LT1 but still....Definately throw some 373's in there and it'll be a whole new car
Wow! With those 2.73's the motor must have been under 2000 rpm at 65. Going from 2.73 to 3.73 is about a 37% increase in rpm. So if the engine was turning 1800 at 65mph, w/2.73, it will be turning at 2466 rpm with the 3.73's. Just something to keep in mind. And your fuel economy will take a real hit too.

But you sure will be able to smoke em!
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Old 11-01-2009, 01:07 PM   #13
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Wow! With those 2.73's the motor must have been under 2000 rpm at 65. Going from 2.73 to 3.73 is about a 37% increase in rpm. So if the engine was turning 1800 at 65mph, w/2.73, it will be turning at 2466 rpm with the 3.73's. Just something to keep in mind. And your fuel economy will take a real hit too.

But you sure will be able to smoke em!
What's that? Is it like VTEC!?
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Old 11-01-2009, 01:16 PM   #14
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I'm getting about 75 miles to a tank less than when I was stock At this point, how much worse could it get with 3:73


OP- yeah, I was disappointed when I found out I had 2.73 and not 3.23s too. Oh well, at least you know that it can be upgraded.
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Old 11-01-2009, 04:09 PM   #15
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OP- yeah, I was disappointed when I found out I had 2.73 and not 3.23s too. Oh well, at least you know that it can be upgraded
EXACTLY !! I went through the freaking traps in 2nd GEAR !
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