got the 3.89's fitted today

FS5 · 01-08-2006, 04:20 PM

got the 3,89 diff gears fitted today,it definately feels a bit more snappy of the line .it surprised me actualy i thought they would've made a bit more difference than they did ,i thought it might have been real peaky in 1st
i reckon you could go 4.11's easy enough without it being to toey.
once i get the speedo sorted i'll go back out to willow bank and see what difference they make at the track.hopefuly the bottom end will hang in there its blowin more smoke than a sigma

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**Stav** · 01-08-2006, 05:11 PM

This good news mate.I thought the same thing when I went to 3.73 ratio..not much difference at all. 4:11 had crossed my mind.

jonbays · 01-08-2006, 08:17 PM

3.9's make good sense really.

Any lower and you need power right to the 5750 rpm cut out and not many Falcons can do that most peak at 5250 -5500 best.

now you will ahve a full 4 gears for the qtr mile its got to be better.

FS5 · 02-08-2006, 02:31 PM

well , after towing the trailer around for work today i can say they have made a huge difference.it feels great its like the trailer isn't even behind it ,i kept looking to see if it was still there and hadn't fallen off.
i'm keen to get out to willowbank and see what it will do. i'm hoping i can at least get it back down to 14.5's.it will be interesting to see what 60ty footers it'l crack now ,with the 3.45's i cracked 1.989 and last time iwas there it did a 2.000 .i'm hoping it'l go alright,the last few times i have fiddled with it i've gone backwards .
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mik · 02-08-2006, 08:58 PM

will be interesting too see how it affects your highway cruising speed and general fuel economy.

**Stav** · 02-08-2006, 09:16 PM

good luck

FS5 · 03-08-2006, 08:31 AM

Quote:

Originally Posted by useless

good luck

thanks mate

FS5 · 03-08-2006, 08:37 AM

Quote:

Originally Posted by mik

will be interesting too see how it affects your highway cruising speed and general fuel economy.

so far so good i can't realy notice any differce to the econemy yet,but i have only been cruising around town mostly.
i got my father inlaw to line his vn up along side me to see the rpm was at 100kph.it was around 2600rpm @ 100kph and around 2800rpm @ 110 kph so it isn't realy reving that hard .its good right where the cam starts to come on song .

xr8ute · 03-08-2006, 09:31 PM

Gears are great. How soon will you be back at the track? Good luck...

FRDGAL · 03-08-2006, 10:20 PM

Quote:

Originally Posted by mik

will be interesting too see how it affects your highway cruising speed and general fuel economy.

I got told the same thing re fuel when I had the 3.9's put into the AU but honestly, it made barely any difference. Well, nowhere near enough for me to regret getting that gearing. Obviously economy is lost a little but in my case, it wasn't as bad as people said it would be.

FS5 · 04-08-2006, 07:41 AM

Quote:

Originally Posted by xr8ute

Gears are great. How soon will you be back at the track? Good luck...

thanks mate,hopefuly i'l get out there next saturday if i can get the speedo sorted.

mik · 05-08-2006, 08:02 PM

Quote:

Originally Posted by FRDGAL_AU6

I got told the same thing re fuel when I had the 3.9's put into the AU but honestly, it made barely any difference. Well, nowhere near enough for me to regret getting that gearing. Obviously economy is lost a little but in my case, it wasn't as bad as people said it would be.

what sort driving %city %highway would you do on average???, i sort of had it in the back of my mind that the higher gears might actually be a little more economical with mostly city driving, cruising around at at 60 kph the the donk is just ticking over at very low revs (1100/1200rpm....the auto ) not the sweet spot, too slow in my opinion for good economy ....cheers mik