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#1 | ||
Regular Member
Join Date: Dec 2015
Location: West of Melbourne
Posts: 488
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Hi All
I'm sure it's in here somewhere...... What would be a recommendation on increasing torque on the XR8, I'm not fussed about top end or anything else I can't actually use. Car is not a daily driver but I still want to be able to drive to Adelaide or similar without ruining the national economy. So far as far as I know everything is pretty stock with an auto, all it has is a Redback cold air intake and a Redback 2.5" Cat Back single exhaust. I'm not looking at engine surgery, just economic bolt on type stuff. Any ideas?
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Cheers Ozrider AUII XR8 200KW FG MK2 XR6 Mini 850 Rover P5 3 Litre Mk1 |
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#2 | ||
FF.Com.Au Hardcore
Join Date: Nov 2006
Location: Sydney
Posts: 1,334
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Hurricane 4-2-1 Headers
If you want new cats/don't care about emissions compliance, get some 100CPI metal cats and put them about 300-400mm behind where the collector merges on the headers A single 2.5" exhaust might be a bit of a restriction. Single 3" probably better and twin 2.5" better again. (I've got the twin 2.5" and it sounds unreal) |
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#3 | ||
R.I.P. Maggie
Join Date: May 2015
Location: Brisbane
Posts: 1,286
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OZ, would you want to go down the chip path? I've been thinking of doing it.
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AUII XR8 200Kw Ute FG XR6T 1976 289 Mustang (Gone) |
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#5 | ||
R.I.P. Maggie
Join Date: May 2015
Location: Brisbane
Posts: 1,286
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What ratio diff in a ute?
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AUII XR8 200Kw Ute FG XR6T 1976 289 Mustang (Gone) |
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#6 | ||
Peter Car
Join Date: Dec 2004
Location: geelong
Posts: 23,145
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Depends if auto or manual i guess. Auto i would say 3.9 or 4.1.
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#7 | ||
R.I.P. Maggie
Join Date: May 2015
Location: Brisbane
Posts: 1,286
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Thanks Boss, will I only need to buy the guts of the diff or a whole new one i.e axles
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AUII XR8 200Kw Ute FG XR6T 1976 289 Mustang (Gone) |
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#8 | ||
Peter Car
Join Date: Dec 2004
Location: geelong
Posts: 23,145
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Just the ring gear and pinion.
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#9 | ||
Regular Member
Join Date: Dec 2008
Location: Sydney
Posts: 128
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What about the 70mm throttle body from a 220kw engine?
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#10 | ||
Regular Member
Join Date: Dec 2015
Location: West of Melbourne
Posts: 488
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All great suggestions but all have a heap of conflicting info re benefits.
I've chipped a couple of bikes and you get the performance but usually at the expense of fuel. No real performance, just different fuel mapping. If I change the diff ratio I get better acceleration but loose cruising economy. I guess I'm looking for the old style carb type thing with 2 barrels until you put your foot down and open the secondaries. Vtec style....
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Cheers Ozrider AUII XR8 200KW FG MK2 XR6 Mini 850 Rover P5 3 Litre Mk1 |
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#11 | ||
FF.Com.Au Hardcore
Join Date: Apr 2012
Location: Adelaide
Posts: 2,802
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Get it tuned, youll notice a difference, chuck some 3.9's in its not that bad.
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Current Car: 2002 AUII LTD 408ci Windsor, T6 S488, TH400, 2 Piece Shaft, Helicial LSD 3.23 IRS Daily: 1998 Mitsubishi Super VR-4 Legnum |
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#12 | ||
Regular Member
Join Date: Oct 2011
Location: Mildura
Posts: 355
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Re the diff gears, I haven't done it myself, but have read other threads where there wasn't necessarily a heap of difference in fuel economy, or not enough that it didn't justify the torque gains in lowering the gearing, depending on how low you go of course.
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Current: 2000 AUII XR8 manual ute. 1966 XP Pursuit ute. 2012 Honda Euro manual (daily drive) Past: 1984 XE Falcon sedan 4.1L. |
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#13 | ||
FF.Com.Au Hardcore
Join Date: Sep 2009
Location: Kalgoorlie
Posts: 712
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Diff gears are already good in an AU XR, my manual is well over 2,000rpm at 120, can put a normal falcon diff in to lower revs, dunno how it effects economy or torque though
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#14 | ||
Regular Member
Join Date: Jan 2006
Location: Sydney , N.S.W
Posts: 427
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diff gears are a good start, gives it a more lively feel, i run 3.91 gear and its no different on fuel as you dont need to load it up as much to get to the speed limit, rpm at 110 isnt to bad at 2500rpm at 110 kmh..
if you want to go for the tunning route can get nice down low torque improvement from a couple of degrees of timing and depending on what or who tunes it, the ecu actually has torque reduction strategies in the ecu that reduce timing under hard load in 1st gear to prevent trans damage, removing these functions make nice improvements... |
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#15 | ||
Peter Car
Join Date: Dec 2004
Location: geelong
Posts: 23,145
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I got better economy around town with 3.9's, and made hardly any difference on the highway. Not enough to make much of a difference anyway.
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#16 | ||
FF.Com.Au Hardcore
Join Date: Apr 2012
Location: Adelaide
Posts: 2,802
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i will own up to fuel economy going down, 3.9's went and foot went further to the floor, now averages 19.6l/100km around town (stock car mind you)
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Current Car: 2002 AUII LTD 408ci Windsor, T6 S488, TH400, 2 Piece Shaft, Helicial LSD 3.23 IRS Daily: 1998 Mitsubishi Super VR-4 Legnum |
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#17 | ||
R.I.P. Maggie
Join Date: May 2015
Location: Brisbane
Posts: 1,286
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What did you get from a stock diff?
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AUII XR8 200Kw Ute FG XR6T 1976 289 Mustang (Gone) |
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#18 | ||
FF.Com.Au Hardcore
Join Date: Apr 2012
Location: Adelaide
Posts: 2,802
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Was averaging around 14.7ish
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Current Car: 2002 AUII LTD 408ci Windsor, T6 S488, TH400, 2 Piece Shaft, Helicial LSD 3.23 IRS Daily: 1998 Mitsubishi Super VR-4 Legnum |
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#19 | ||
R.I.P. Maggie
Join Date: May 2015
Location: Brisbane
Posts: 1,286
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Big jump
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#20 | ||
FF.Com.Au Hardcore
Join Date: Apr 2012
Location: Adelaide
Posts: 2,802
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yeah i do a lot of short drives, and definitely drive it harder since having them in there.
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Current Car: 2002 AUII LTD 408ci Windsor, T6 S488, TH400, 2 Piece Shaft, Helicial LSD 3.23 IRS Daily: 1998 Mitsubishi Super VR-4 Legnum |
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#21 | ||
R.I.P. Maggie
Join Date: May 2015
Location: Brisbane
Posts: 1,286
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I do mostly long drives, its not a daily but I go up to Hervey Bay & Bundy most weekends, so it might be worth a crack for me with 3.9 or 4.1. Just gotta find them, how much new would it cost?
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#22 | ||
FF.Com.Au Hardcore
Join Date: Apr 2012
Location: Adelaide
Posts: 2,802
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my gears were about $600 new iirc and then $500 fitted with new bearings
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Current Car: 2002 AUII LTD 408ci Windsor, T6 S488, TH400, 2 Piece Shaft, Helicial LSD 3.23 IRS Daily: 1998 Mitsubishi Super VR-4 Legnum |
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#23 | ||
R.I.P. Maggie
Join Date: May 2015
Location: Brisbane
Posts: 1,286
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Thats not to bad if you get some extra torque out of it
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#24 | ||
FF.Com.Au Hardcore
Join Date: Apr 2012
Location: Adelaide
Posts: 2,802
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definitely, need one of those 'frequently side ways stickers', gears and removing the torque reduction strategies and adding some timing down low made a huge difference!
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Current Car: 2002 AUII LTD 408ci Windsor, T6 S488, TH400, 2 Piece Shaft, Helicial LSD 3.23 IRS Daily: 1998 Mitsubishi Super VR-4 Legnum |
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#25 | ||
R.I.P. Maggie
Join Date: May 2015
Location: Brisbane
Posts: 1,286
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Just get it tunes or a J3 chip?
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#27 | ||
RIP...
Join Date: Dec 2004
Posts: 15,524
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Being auto, the gearing is up the poo.
3.9 or 4.1 gears will help a lot. The standard headers are garbage, throw on some tri-Y's with 1.5" primaries, Advance or Hurricane. The single 2.5" system will go ok as you're not chasing top end power. Then a tune with ignition timing advanced and torque reduction removed and you'll be doing skids all over the joint.
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. Oval Everywhere... |
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#28 | |||
R.I.P. Maggie
Join Date: May 2015
Location: Brisbane
Posts: 1,286
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Quote:
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#29 | ||
Regular Member
Join Date: Dec 2015
Location: West of Melbourne
Posts: 488
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What revs are you guys showing at 100kph?
Mine sits on 2000rpm.
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Cheers Ozrider AUII XR8 200KW FG MK2 XR6 Mini 850 Rover P5 3 Litre Mk1 |
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#30 | ||
R.I.P. Maggie
Join Date: May 2015
Location: Brisbane
Posts: 1,286
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1900 in a ute
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