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3.7s and 4.11 gearing 

 

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 Post subject: 3.7s and 4.11 gearing
Posted: Sun Mar 25, 2007 6:57 pm 
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Hey guys, to those of you with autoboxes running 3.7/4.11 diff ratios, what type of improvement did u see in you 1/4mile times? also please list your engine mods if any.


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Molloy.

 

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Posted: Sun Mar 25, 2007 7:08 pm 
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.2 of a second with 3.73 LSD, originally 3.23 open. Same mods as in sig plus wade 1636. Strangely enough my 60' time only improved by .064 of a second nothing really.

 

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Posted: Sun Mar 25, 2007 7:20 pm 
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Sorry to hijack the topic but what were peoples top speeds with these gears? More so the 5 speed drivers.

 

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Posted: Sun Mar 25, 2007 7:44 pm 
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WagonDad wrote:
.2 of a second with 3.73 LSD, originally 3.23 open. Same mods as in sig plus wade 1636. Strangely enough my 60' time only improved by .064 of a second nothing really.
Righto, doesnt seem to be worth it then. How did it feel after your swap over? from standing start.


cheers

Molloy.

 

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Mods going on: Nizpro springs, bosch 040 pump + Walbro gss341, 600cc injectors, PWR transcooler, 20% Underdrives, 15psi Actuator, Kingspring SSL's, 15psi tune.....More coming

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Posted: Sun Mar 25, 2007 8:06 pm 
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You should notice a fair bit more poke through the gears, with a jump from 3.2's to 3.7's.
The quarter mile times could be affected as there could now be another gear change before the line. But on the street there should be decent improvement.
Mooseman, i'll let you know in a few weeks what 4.11's will do.
But as a few guys have worked out, i'll probably be needing a change to 5th over the line on the strip, which is s**t. So i wouldn't be thinking that the top speed would be much above 200km/h at all.
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Posted: Sun Mar 25, 2007 9:46 pm 
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I know you wanted 5spd guy to comment on 4.11's but just to complete the picture, with a 4spd toploader I thin about 140-160 would be shaking the thing to pieces.

 

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Posted: Sun Mar 25, 2007 10:14 pm 
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Molloy wrote:
WagonDad wrote:
.2 of a second with 3.73 LSD, originally 3.23 open. Same mods as in sig plus wade 1636. Strangely enough my 60' time only improved by .064 of a second nothing really.
Righto, doesnt seem to be worth it then. How did it feel after your swap over? from standing start.


Definately worth it, best power upgrade so far but then again I havent had to much sccess in that department. The car feels like it has balls now, off the line you dont notice a huge difference but the revs rise quicker and get into the power band much quicker, it also doesnt drop down as many revs when the auto changes up a gear so you stay higher in the rev's and more in the meat of the power.

 

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4.0L EF Fairmont Station Wagon. EL GT Snorkel. K&N Pod in air box. 3" Intake piping.
Home port job. 1636 Wade cam. Wildcat Extractors, 2 1/2" cat and exhaust.
2200/2400rpm Dominator More Stall. Stage two mechanical shift kit. 3.73 4 pinion LSD. 15.078 @ 92mph.

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Posted: Sun Mar 25, 2007 11:37 pm 
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Sort of related but to give you an idea of whether it's worth it or not, I just sold my 3.45 diff in my EL and traded it for a 3.08 diff. Took it for a drive after the swap and had to check twice if the handbrake was on. Feels soooo much more sluggish!
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