5AT 3.5 Final Drive: 1/4 Times before AND after
#1
10-09-2005 | 02:51 AM
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Posts: n/a
5AT 3.5 Final Drive: 1/4 Times before AND after
I just got this done earlier this week. Me and a friend with a 6spd G traded rearends- hes going TT and I'm going SC so we figured I could use alittle shorter 1st gear, etc., while he could manage with the slightly taller gears...
Mods:
AEM CAI
19'' rims
3.5 rearend
I made 5 passes before the new gears...
Conditions:
Sea level [Baytown, Tx race track]
Mid 90's
11PM
The fastest two times:
14.52 @ 97.13
14.55 @ 97.36
I made 3 passes after the new gears...
Conditions:
Sea level [Baytown, Tx race track]
Lower 60's
11PM
The two fastest times:
14.44 @ 98.44
14.47 @ 99.60
As you can see the weather shoulda been for me and helped me out alittle but it seems between both the 30 degree drop AND the 3.5 final drive I was only able to shave off 1/10 of a second... And I coulda sworn the car felt much faster.... maybe its just at freeway speed?
Gaw, I need the SC put on FAST!!
Mods:
AEM CAI
19'' rims
3.5 rearend
I made 5 passes before the new gears...
Conditions:
Sea level [Baytown, Tx race track]
Mid 90's
11PM
The fastest two times:
14.52 @ 97.13
14.55 @ 97.36
I made 3 passes after the new gears...
Conditions:
Sea level [Baytown, Tx race track]
Lower 60's
11PM
The two fastest times:
14.44 @ 98.44
14.47 @ 99.60
As you can see the weather shoulda been for me and helped me out alittle but it seems between both the 30 degree drop AND the 3.5 final drive I was only able to shave off 1/10 of a second... And I coulda sworn the car felt much faster.... maybe its just at freeway speed?
Gaw, I need the SC put on FAST!!
#5
10-09-2005 | 10:33 PM
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Posts: n/a
Frostydc4, I haven't had a chance to play with the cruise control. I asked the tech about it and he said the only thing he could think of is that the computer is programed to know what the rear wheels and RPMs are supposed to be at at any given speed or time and if it is off by too much the computer will ust shut down whichever function is causing the error.
Mr pharmD, 60' were: 2.257, 2.294, 2.261. I can't tell you on which run I did what, but I know one time I launched from idle, one was from about 1000, and the other just below 2000. Every run was in the sport shift and I shifted perfectly ever time [meaning I didn't bounce or shift to early, the needle hit 6700-6800 everytime- 2 lines into the redline].
Mr pharmD, 60' were: 2.257, 2.294, 2.261. I can't tell you on which run I did what, but I know one time I launched from idle, one was from about 1000, and the other just below 2000. Every run was in the sport shift and I shifted perfectly ever time [meaning I didn't bounce or shift to early, the needle hit 6700-6800 everytime- 2 lines into the redline].
#7
10-10-2005 | 12:10 AM
If the VQ35 acts anything like the VQ30, I think you can chalk up those gains mostly to the change in temp. I know my 96 Maxima was consistenly .25 and 2.5mph slower in 90+ degree weather compared to 60 degree weather. This was over 3 years of racing. Hell, I gave up racing in any weather above 70 degrees because of it.
Your trap speeds are really nice though. Dump those boat anchor rims and your 60 foot and ET would drop ~.15 and I'd think 100mph would be possible in the 1/4 mile.
Your trap speeds are really nice though. Dump those boat anchor rims and your 60 foot and ET would drop ~.15 and I'd think 100mph would be possible in the 1/4 mile.
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#10
10-12-2005 | 04:01 PM
Joined: Jun 2002
Posts: 30,341
Likes: 9
From: Cambridge, Ont. Canada
Originally Posted by HomieG35
I just got this done earlier this week. Me and a friend with a 6spd G traded rearends- hes going TT and I'm going SC so we figured I could use alittle shorter 1st gear, etc., while he could manage with the slightly taller gears...
Mods:
AEM CAI
19'' rims
3.5 rearend
I made 5 passes before the new gears...
Conditions:
Sea level [Baytown, Tx race track]
Mid 90's
11PM
The fastest two times:
14.52 @ 97.13
14.55 @ 97.36
I made 3 passes after the new gears...
Conditions:
Sea level [Baytown, Tx race track]
Lower 60's
11PM
The two fastest times:
14.44 @ 98.44
14.47 @ 99.60
As you can see the weather shoulda been for me and helped me out alittle but it seems between both the 30 degree drop AND the 3.5 final drive I was only able to shave off 1/10 of a second... And I coulda sworn the car felt much faster.... maybe its just at freeway speed?
Gaw, I need the SC put on FAST!!
Mods:
AEM CAI
19'' rims
3.5 rearend
I made 5 passes before the new gears...
Conditions:
Sea level [Baytown, Tx race track]
Mid 90's
11PM
The fastest two times:
14.52 @ 97.13
14.55 @ 97.36
I made 3 passes after the new gears...
Conditions:
Sea level [Baytown, Tx race track]
Lower 60's
11PM
The two fastest times:
14.44 @ 98.44
14.47 @ 99.60
As you can see the weather shoulda been for me and helped me out alittle but it seems between both the 30 degree drop AND the 3.5 final drive I was only able to shave off 1/10 of a second... And I coulda sworn the car felt much faster.... maybe its just at freeway speed?
Gaw, I need the SC put on FAST!!
Between possible poorer traction, the temp variation, and that your new ratio is not a lot different than OEM (3.36:3.5) , I'd say your tenth isn't too bad at all.
G/L with the SC. -- now that will be good for a 'few' more tenths.
C.
#11
10-13-2005 | 04:25 AM
now the 3.5 rearend of the 6MT should have the factory LSD on it where his original rearend didnt have it. so i would think that his traction would be a little better.
i know with the shorter gears his traction is reduced but i would think that adding a limited slip would overcome that.
?????????
i have a auto sedan that i have been working on, my next mod i was considering is the 3.9 gearing, but just havent been convinced yet. its a lot of money for only gears, been racing a while...
i know with the shorter gears his traction is reduced but i would think that adding a limited slip would overcome that.
?????????
i have a auto sedan that i have been working on, my next mod i was considering is the 3.9 gearing, but just havent been convinced yet. its a lot of money for only gears, been racing a while...
#13
10-16-2005 | 09:57 PM
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Posts: n/a
To me its just too much work to change out the 19's with some 17's with a radial on it or something. I don't race it very often and I want to know what it will do in street trim [19'' rims, spare in, I even had a computer printer and school books on the floorboard]. I'm sure I could do better on even the stock rims and tires. I ran a 14.2 in the car completely stock once it hit 2,000 miles.
VDC was off the entire time and traction was no problem even brake torquing to almost 2000RPMs - just mash it and went and it didn't even chirp! [The track was WELL prepped].
I did notice my one trap speed though - 99.60 was the highest I'd ever gotten. I figured my top speed would be alittle lower or about the same because you have to shift into 4th about 200ft before the finish line putting you in a RPM spot right at the end [need a shot of naaawwwzz, lol].
Haven't tried traction out on the street at all, haven't tried any "spirited" U-turns or starting off quick from a dig.... Overall I still like the mod, I got it installed for about $100 under the table at the dealer [but I also work for Infiniti]. The only thing I don't like is I live down a VERY busy street, red light after red light and the car likes to kick though the gears abit faster no so by 28-29 MPH I'm already in ''5th'' and then I just have to stop again.... I find myself in the sport shift even more now then I was before...
VDC was off the entire time and traction was no problem even brake torquing to almost 2000RPMs - just mash it and went and it didn't even chirp! [The track was WELL prepped].
I did notice my one trap speed though - 99.60 was the highest I'd ever gotten. I figured my top speed would be alittle lower or about the same because you have to shift into 4th about 200ft before the finish line putting you in a RPM spot right at the end [need a shot of naaawwwzz, lol].
Haven't tried traction out on the street at all, haven't tried any "spirited" U-turns or starting off quick from a dig.... Overall I still like the mod, I got it installed for about $100 under the table at the dealer [but I also work for Infiniti]. The only thing I don't like is I live down a VERY busy street, red light after red light and the car likes to kick though the gears abit faster no so by 28-29 MPH I'm already in ''5th'' and then I just have to stop again.... I find myself in the sport shift even more now then I was before...
#14
10-18-2005 | 09:24 PM
Registered User
Joined: May 2005
Posts: 44
Likes: 0
this may help
Lower your air preasure in your tires to 29 to 30 lb and your times will improve. I change the gearing in my 350 z to a 3.52 and picked up 3ths. 13.48 to 13.18. 300 RWHP.
Toyo ts 1. 275/35/19. There was more wheel spin with the new gears. Had to lanch at 750 rpm. 60 ft times 2.065 to 2.040. What tire do you have? If your run drag radials your times will improve.
Toyo ts 1. 275/35/19. There was more wheel spin with the new gears. Had to lanch at 750 rpm. 60 ft times 2.065 to 2.040. What tire do you have? If your run drag radials your times will improve.