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shockwavexr6t

Diff Gears 4.11's

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Hi everyone

I've done a bit of searching but unable to find any info or feedback with changing the diff gears.

I believe the xr6t auto runs 3.4 diff gear and the manuals about 3.7. I'm considering changing my diff gears to 4.11's. This I believe will give better acceleration of the line but you lose abit of top end.

I know that you are able to recalibrate the speedo with the edit once changed.

Just what to know if anyone has gone down this path or is considering it.

Did they notice a difference?

Your feedback would be appricated

cheers

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from past 4 11's will make a huge difference prob only feesable if you were gonna drag you car all the time, it will rev its *beep* off on the free way

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sorry just add this but yes it will launch and you will notice it I seen the kit advertised on ebay and was thinking about giving it ago but I thought the 4 11's might be to much. but prove me wrong

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Are you in an auto or manual?

What im writing below is mostly relevant to the manual:

The reason I ask is that yes the acceleration will be lots better, but you will also likely find if you are in a manual you will need 3rd gear to reach 100kmh which means you lose time on a gear change - which isnt good for 0-100 times.

At the moment the Mk1 5 speed gets about 110kmh in first and the Mk2 6 speed about 115-120 (cant remember but will look again this arvo). Dropping the diff will mean a quick change into 3rd, a spurt of acceleration and then you will be at 100kmh.

Hard to say if you waill have a better time, but in general an extra gear change isnt desirable.

Id do the sums to work out the max speed in each gear and see if you can live with it. There are progs on the internet that can tell you that.

It will also impact freeway speed cruising as in the Mk1 5th is pretty well callibrated to allow good acceleration at 100kmh but still be economical. 6th in the Mk2 is the same, although really only accelerates well at 120kmh. You may find your freeway cruising isnt as good economy wise, although I think the 6 speed will be less impacted than the 6 speed.

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At the moment the Mk1 5 speed gets about 110kmh in first and the Mk2 6 speed about 115-120 (cant remember but will look again this arvo).

Holy crap Mick! My manual ute doesn't do 110kmh in first!!! Nor does my phoon do 115-120 !!

Me thinks you meant 2nd...... :laughing:

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adam runs a 9.98sec 1/4 with stock gearing... nuff said.

<{POST_SNAPBACK}>

I thought Adam was running a three speed box so doesn't that change things a little ?

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adam runs a 9.98sec 1/4 with stock gearing... nuff said.

I thought Adam was running a three speed box so doesn't that change things a little ?

Drive or 3rd gear is still 1:1 gearing

the diference will be 1st and 2 nd gearing

Rob

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I know some blokes that have changed their diff gears in ford xr8 utes and have had great results a the calder drags. and one of them has run a 12.69 pass unopen motor. So maybe diff gear have some advantages.

All I'm looking at is other options to make these things go harder of the line.

and yes my is a manual 6 speed

cheers

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Brian (BCL) has changed his diff gears and in another thread gave quite a detailed run down of the features and effects. Maybe Brian will read this and comment or post a link to the thread.

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higher diff gears, I.e 4.11s help with N/A engines over the qtr but they dont with turbo engines. Turbo engines like to be loaded up hence as posted previously sub 10s on 3.45 gears. Or just learn the hard way and put them in.

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higher diff gears, I.e 4.11s help with N/A engines over the qtr but they dont with turbo engines. Turbo engines like to be loaded up hence as posted previously sub 10s on 3.45 gears. Or just learn the hard way and put them in.

<{POST_SNAPBACK}>

You don't know what you are on about.

Turboed rotors run 4.58s some even higher.

All cars like lower ratios, just depends on what box you are running.

Auto and 4.11s are the go for 1/4 racing, especially turbos.

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Its all relevant, if you want to drag race the car only, then work it out and set it up to run at just before redline in top gear as it crosses the line, that's how Drag Racers setup their cars, or all the ones I have spoken to anyway :crybaby:

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Oops, sorry, you are right :)

I meant around 70 in 1st in my Mk1 and 75 in 1st in my Mk2...and the 100+ speeds in 2nd.

Although so I hear it you can get over 90 in 1st with an edit and increased redline!

At the moment the Mk1 5 speed gets about 110kmh in first and the Mk2 6 speed about 115-120 (cant remember but will look again this arvo).

<{POST_SNAPBACK}>

Holy crap Mick! My manual ute doesn't do 110kmh in first!!! Nor does my phoon do 115-120 !!

Me thinks you meant 2nd...... :crybaby:

<{POST_SNAPBACK}>

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higher diff gears, I.e 4.11s help with N/A engines over the qtr but they dont with turbo engines. Turbo engines like to be loaded up hence as posted previously sub 10s on 3.45 gears. Or just learn the hard way and put them in.

<{POST_SNAPBACK}>

You don't know what you are on about.

Turboed rotors run 4.58s some even higher.

All cars like lower ratios, just depends on what box you are running.

Auto and 4.11s are the go for 1/4 racing, especially turbos.

<{POST_SNAPBACK}>

I'd expect that comment from someone born in September 1985 but not someone born in Sepetember 1975.

You drive a 4cyl turbo so obviously you know more than the guys who drive and drag race turbo 6s. I bet you also know heaps about brain surgery?

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higher diff gears, I.e 4.11s help with N/A engines over the qtr

dw...true

but they dont with turbo engines. Turbo engines like to be loaded up hence as posted previously sub 10s on 3.45 gears.

dw.... not so true

Or just learn the hard way and put them in.

dw....true

<{POST_SNAPBACK}>

You don't know what you are on about.

dw...not so true

Turboed rotors run 4.58s some even higher.

dw....true but irrelevant

All cars like lower ratios, just depends on what box you are running.

dw....not true

Auto and 4.11s are the go for 1/4 racing, especially turbos.

dw....ahh ahh nope no way not if you want traction from your t

<{POST_SNAPBACK}>

essentially trana is right but for the wrong reasons!!!!

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4.11 diff gears create more torque because it makes the pinion gear spin 4.11 times to turn the crownwheel creating more force. Its just adjusting a gear set to get what you want out of your gear set up, Custom machined gears in manual transmissions do the exact same difference but it requires more money and effort, you wouldnt really adjust it unless you really wanted to doesnt matter if its got a turbo or N/A the difference is the same. you loose top end because your putting in bigger ratios which loose speed but carry more force

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