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Banjo Diffs, 3.08 versus 2.78

Started by _RobLX_ , Dec 23 2007 10:52 PM

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21 replies to this topic

#1 _RobLX_

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Posted 23 December 2007 - 10:52 PM

Hey guys

I'm currently running a 3.08 diff behind a worked 202 three speed auto, plently get up and go, but a bit thirsty.

Has anyone had a 2.78 behind a 202, and would they recommend a change from a 308.

The current diff is noisy and need replacement, so have the option to go to a different ratio. Mostly city driving, the car is a daily driver, but would like to get out on some longer runs as I love driving the thing.

Cheers

Rob

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#2 _Flamenco_

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Posted 23 December 2007 - 11:16 PM

You'll have a slower takeoff with the 2.78 but higher top end at lower revs

I'd get another 3.08 if you do occasional spirited driving and have a need for it but 2.78 is the best 'highway diff'.

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#3 _73LJWhiteSL_

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Posted 24 December 2007 - 07:56 AM

I had a 2.78 behind my stock 173 & M20 (orginally a auto car), and like Flamenco has said, it was slower to take off. It was quite boggy with the 173, would be better with a worked 202.

Steve

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#4 LOWS2

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Posted 24 December 2007 - 11:58 AM

Ive got the same prob I have the 3.08 ratio in my my LJ (with 173, auto) runs out of puff in the top end on the highway but is good fun round town. Originally had 2.78 and was a little slow to get going (especially with stock 173 lol). Mite go back to a 2.78 once i get a worked 202 into it.

I reckon the 2.78 is the go for you mate.

Cheers,
Mick

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#5 Heath

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Posted 24 December 2007 - 12:53 PM

Get another 3.08 and go a four speed or five speed manual if you want economy and just a better car overall

The 2.78 will be ridiculous if you have a worked 202 and auto with std stally. At what RPM does your cam come in?

Edited by Heath, 24 December 2007 - 12:54 PM.

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#6 _gtr161s_

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Posted 24 December 2007 - 04:24 PM

2.78 is alittle tall for a 6 if you want some speed, even for economy you will find the engine will labour more.

If the budget can extend further go for a 5spd with a 3.36 or 3.55lsd

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#7 MRLXSS

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Posted 24 December 2007 - 05:11 PM

I had a 3.36, 3.08 and a 2.78 behind my Old 253....

The 3.36 was fun to drive around until i had to put petrol in, it revved a bit to high for my liking even at 80kays....

The 2.78 was great for fuel, but i really noticed that it was much slower... It lost a lot of it Snap!

the 3.08 i found the best, it was kinda the best of both worlds. Snapping enough for when i wanted to enjoy it a bit, but good for fuel at the same time.

All that said now i run a 3.5lsd Ford 9".... Now thats fun!

Edited by MRLXSS, 24 December 2007 - 05:11 PM.

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#8 _73LJWhiteSL_

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Posted 24 December 2007 - 06:30 PM

If the budget can extend further go for a 5spd with a 3.36 or 3.55lsd

I'm running a 3.36 behind a Celica 5 speed, and i'm quite happy with it. I wouldn't go to a 3.55 tho. Especialy if you go on the Hume at 110KP. Even with a 3.36 and a 5 speed it will still hit 3000RPM depending a bit on tire size.

Steve

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#9 _threeblindmice_

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Posted 25 December 2007 - 09:02 AM

Get use to it,202s are thirsty,our 202 auto has a 3.08 I wouldn't put a taller dif in it.I did have a 202 3 speed manual,2.78 ,mild cam,head,WW and extractors once that got 28MPG on the highway. some times a just little less pressure on the accelerator doesn't mean much change in your road speed,or check of the float level ,and tune.

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#10 _The Stig_

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Posted 27 December 2007 - 09:17 AM

I couldn't resist replying to this one - My first car was a bog stock HJ with 202/trimatic, driving around town it got about 8 MPG in the old language - about the same as an XU-1 with triples! Sold it and bought a HQ SS (That I wish I still owned!), with 253/M20 - it used about HALF the fuel of the 202 auto. On a run it was good for about 25 MPG. My old man told me I was crazy buying a V8 and that I'd never afford to run it - Even today he still has trouble believing it was so much better than the 6.
My old man later bought a 202 4 speed LX hatch (That I also wish I now owned!), it wasn't too bad on fuel, but still not as good as my HQ. Definately makes a difference with a manual box when you're talking about cars of that age.
A mate of mine had a LH Torrie, with a jap 4 spd box, and 202, we fully rebuilt the engine, with about a 3/4 race cam, YT head, tried different carbs - 350 Holley for a while, even triple sidedraught SU's - never really went as hard as we wanted. Eventually we found it had a 2.78 in it, we replaced it with a 3.55 that we had lying around, it went hard as hell then - you just wouldn't want to drive it on a highway!

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#11 _Herne_

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Posted 27 December 2007 - 09:29 AM

Ditch the 202 they are a slug anyway and fit a 253. I am betting your economy will improve.

Herne

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#12 Ice

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Posted 27 December 2007 - 11:09 AM

202s are not slugs you just got to get someone with a bit of knowledge know how to build it for fuel economy as for diff ratio holden got it right most times id be leaning towards 3.08 for a good allround gears.

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#13 N/A-PWR

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Posted 11 January 2014 - 08:12 PM

I won every race in 1st gear using a 2.78 diff to 60 miles an hour, and fanning the clutch, just needed to replace the clutch. Dave I

p.s. bye the way, the Big end usually gave in at the end of the clutch life of 2000 miles reeving the life out at 7500 continuously

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#14 TerrA LX

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Posted 11 January 2014 - 08:47 PM

1C87BE73-FD10-4340-AFC234B1A61919E3_zps6

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#15 N/A-PWR

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Posted 11 January 2014 - 08:50 PM

It was Skap's fault me looking for stuff, and I came across this Thread TerrA

Edited by TORYPOWER, 11 January 2014 - 08:50 PM.

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#16 yel327

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Posted 11 January 2014 - 09:02 PM

Found it odd that no-one asked him probably the most important question: what size tyres? A 2.78:1 diff with 13" tyres will be about the same as a 3.08 with 14".