3.73 Gears installed... car running slower in 1/4
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3.73 Gears installed... car running slower in 1/4 - 4/30/2008 8:33:51 PM
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gburke1
Posts: 63
Joined: 4/19/2007
Status: offline
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Hello everyone.
The other day I had some 3.73 Gears installed in my car. I drove it for 2 or 3 days & now today I took it out to the track. I ran several times... the best I could get was a 13.7 and most runs were in the 13.9 or 14.0 range... I am certain I was running these 13.9 or 14.0 range when I was stock... and the car seems to FEEL faster than before the 3.73s
I have an Intake, 3.73 Gears, and of course a Tune. Before the gears were in I ran a best of a 13.453 which I lost the time slip for... so I will show a different comparison of some runs before and after.
Before:
R/T .565
60' 2.117
330' 5.814
1/8 8.820 @ 81.84 MPH
1000 11.405
1/4 13.586 @ 103.03 MPH
After:
R/T .094
60' 2.127
330' 5.824
1/8 8.872 @ 80.81 MPH
1000 11.497
1/4 13.734 @ 100.56 MPH
I have come up with a few possibilities of what might have gone wrong...
1) Track timing/clocking equipment was messed up or really bad track conditions (a couple people were saying they were running slower... others said they didn't notice anything... I saw a couple cars that should have ran faster... gto ran 14.4 and 350z ran a 14). This may be most likely as last time I went it was reporting a trap speed that couldn't have been right... like 80 mph
2) Wrong tune was installed by shop. If so I re-installed it when I got home. (lesson learned to bring tuner to track...)
3) Doug gave me a bad tune?
4) Something not right with gear install
Opinions?
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13.453 @ 103.89 MPH
'06 Legend Lime GT Auto (91 B@ma Race Tune, JLT Intake)
New: Installed 3.73 gears.. track times to come!
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RE: 3.73 Gears installed... car running slower in 1/4 - 4/30/2008 8:36:53 PM
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soon2bboosted06
Posts: 71
Joined: 8/28/2007
Status: offline
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could be any of the above. i was told about .3 to .4 off 1/4 times. i would reload the tune and try again
_____________________________
06 vista blue GT auto
19" ASA wheels
JLTII xcal2
pypes mid muffler
FRPP 4.10's
zex 100 shot
3000 stall T/C (coming soon)
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RE: 3.73 Gears installed... car running slower in 1/4 - 4/30/2008 8:43:42 PM
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Bluestar
Posts: 2894
Joined: 2/24/2007
Status: offline
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Did you have your shift points changed for the 3.73's ?????
I think that's the problem.
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"A man's gotta know his limitations"...Clint Eastwood
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RE: 3.73 Gears installed... car running slower in 1/4 - 4/30/2008 10:46:47 PM
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Rock36
Posts: 370
Joined: 2/21/2006
Status: offline
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quote:
ORIGINAL: Bluestar
Did you have your shift points changed for the 3.73's ?????
I think that's the problem.
That is a good call, I didn't notice he had an auto.
Your trap speeds dropped significantly too, I'm thinking a bad DA might have had something to do with it too
_____________________________
2005 Mustang GT
JLT II CAI, Kooks LTs w/ catted X, FRPP CMCV deletes, FRPP 4.10 gears, Steeda UDPs, FRPP Axle backs, BMR LCAs, BMR Rear Sway Bar, BMR Panhard Bar, Panhard Bar Brace, CHE K member brace, Xcal2, Hurst Shifter, Steeda STB.
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RE: 3.73 Gears installed... car running slower in 1/4 - 5/1/2008 1:25:34 AM
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SilvrStang
Posts: 3880
Joined: 4/23/2006
From: Las Vegas
Status: offline
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What are the shift points with 3.73s suppose to be?
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Mods: JLT Intake,Diablo Predator,UPR 70MM TB/Plenum,Nitto Drag Radias, Eibach Pro Kit, MAC O/R H Pipe/Magnapacks
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RE: 3.73 Gears installed... car running slower in 1/4 - 5/1/2008 1:50:10 AM
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67mustang302
Posts: 5208
Joined: 4/21/2007
Status: online
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What was the weather like on the different days? Higher temps and humidity can have a pretty big impact on track times.
_____________________________
Who cares how much horsepower it has, all that matters is how fast it goes!
Best run 13.23 at 106.97mph with a 2.183 60'
Times from before tune and driver mod.
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RE: 3.73 Gears installed... car running slower in 1/4 - 5/1/2008 2:54:50 AM
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Stkjock
Posts: 2796
Joined: 1/18/2007
Status: offline
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quote:
ORIGINAL: SilvrStang
What are the shift points with 3.73s suppose to be?
they would need o be adjusted due the gear ratio change. i believe that the rpm points would remain the same - the computur would have to be told that the gears were changed
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Tngstn 06GT-5 spd -Vortech HO S/C-Tuned by Realspeed Auto
You can never have too much power, just not enough traction.
12.33 @ 112.3 - 1.71 60"
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RE: 3.73 Gears installed... car running slower in 1/4 - 5/1/2008 7:06:43 AM
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Wally39
Posts: 1325
Joined: 3/15/2006
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Could be weather and track conditions. Seems to me maybe you were spinning off the line more.
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Saleen Supercharged
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RE: 3.73 Gears installed... car running slower in 1/4 - 5/1/2008 7:16:54 AM
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cacimar
Posts: 1438
Joined: 3/20/2007
Status: online
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it could that u need to brake in those gears a little bit more, 2-3 days not enough
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04 SRT: 50 trim + supporting mods running only 11lbs.
 The kid got owned!!!!!!!Twice
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RE: 3.73 Gears installed... car running slower in 1/4 - 5/1/2008 7:31:30 AM
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AmericanSpeed
Posts: 409
Joined: 3/16/2007
From: Orlando, FL
Status: offline
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I'm thinking a worse DA. Make sure your tune is correct and go again and see what happens.
_____________________________
05 redfire gt premium 5 spd: K&N CAI, XCAL2, 93 Octane Tune from VMP, full suspension
DynoJet--> 287 RWHP & 307.5 ft-lbs RWTQ
CAI + tune only--12.877 @ 106.79 w/ 1.819
CAI + tune + suspension--12.783 @ 108.05 w/ 1.841
(both on stock tires)
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RE: 3.73 Gears installed... car running slower in 1/4 - 5/1/2008 9:10:34 AM
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wolfpup
Posts: 340
Joined: 2/6/2008
From: LONG BEACH, CA
Status: offline
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im no expert but dont u need 500 miles to break in the gears ???
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05 Sonic Blue V6 SDS #027 of 200
STANGPEDE MEMBER - LOS ANGELES CHAPTER
BBK CAI, Magnaflow duals,
coming soon... JBA hdrs, T-Lok & 4.10s, bama
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RE: 3.73 Gears installed... car running slower in 1/4 - 5/1/2008 12:05:52 PM
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njdanmustang
Posts: 274
Joined: 11/9/2007
Status: offline
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^ thats what is recommended. Yea 2-3 days uh... your gonna be hearing some noise in a while.
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99 flows, bbk intake, mach1 chin, mach 1 grill delete
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RE: 3.73 Gears installed... car running slower in 1/4 - 5/1/2008 12:17:19 PM
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Projectquick
Posts: 956
Joined: 8/22/2007
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Like others have said the weather and track conditions play a huge part in ETs.
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ProjectQuick Fox Official start date: 2/10/08
F*ck N/A, I want boost :)
This is my Fox. There are many like it but this one is mine.
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