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#31 | ||
Regular Member
Join Date: Jan 2006
Location: Sydney , N.S.W
Posts: 427
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3.9 gears put mine at 2500rpm @ 110 kmh
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#32 | ||
Regular Member
Join Date: Dec 2015
Location: West of Melbourne
Posts: 488
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I'll take it a run shortly and see what it does at various speeds, gps and speedo.
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Cheers Ozrider AUII XR8 200KW FG MK2 XR6 Mini 850 Rover P5 3 Litre Mk1 |
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#33 | ||
FF.Com.Au Hardcore
Join Date: Apr 2009
Posts: 2,215
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One thing you must do if you have messed with the exhaust is to get it tuned for it, as you will only loose power by exhaust alone and that's a fact !
If you want more torque change the cam, as that's the heart of the engine that rules such things. |
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#34 | ||
R.I.P. Maggie
Join Date: May 2015
Location: Brisbane
Posts: 1,286
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Just done a freeway drive it was 2100 rpm @ 100kmph. In a ute, stock but for 4001 pacemakers @ bigmouth.
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#35 | ||
Regular Member
Join Date: Jan 2006
Location: Sydney , N.S.W
Posts: 427
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you dont have to get it tuned for exhaust, nothing will change, the afrs wont change unless there has been a significant change of air or fuel coming into the engine, yes by changing the exhaust your letting the gasses out faster but it wont do much if there is no change of whats going into the engine.
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#36 | |||
FF.Com.Au Hardcore
Join Date: Feb 2008
Location: Perth, Northern Suburbs
Posts: 4,889
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Gotta be honest, most of the above suggestions may improve top-end power, but won't do much for low-end torque.
A shorter diff ratio will effectively give you more torque at the back wheels, but at the expense of cruising economy. You also need to consider your exact needs, because unless you have a load in the back, your ability to use that torque will be limited by your tyres. You can tweak it a bit with a tune, but keep in mind that all you're really playing with is ignition and fuelling. Quote:
Beyond that, the best way to boost low-end torque is with a small super-charger. ![]()
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#37 | |||
FF.Com.Au Hardcore
Join Date: Apr 2009
Posts: 2,215
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Quote:
Truth be tolled I wanted him to get it chipped and all so I could see the difference, I think he was only set on going for exhaust before that. ![]() And another VT 5.0L SS had a full system and the other VT 5.0L SS was stock, fact is the stock hosed off the full system one that was not chipped. ![]() Some poor bugger thinks exhaust works just like the old carby fed do is totally mislead. not to mention jetted correctly they do make more power. |
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#38 | ||
Regular Member
Join Date: Jan 2006
Location: Sydney , N.S.W
Posts: 427
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i can only go off my experience with tunning my xr8, going from factory cats with a single exhaust to a dual 2.5" system with 100 cel cats had no effects on the air fuel ratio or ignition timing, so there was nothing to tune in my case,
it did not kill any of the down low torque as some people claim and gained slightly in the top end. |
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#39 | ||
FF.Com.Au Hardcore
Join Date: Jan 2010
Location: Townsville North Queensland
Posts: 547
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That would have to be a ute? the 179 was released with VT so the only VS to receive the roller cam block was the ute (or optional 195i) otherwise it's the older 168 or 185.
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Our Tickford cars: 2001 Congo Green AU 111 XR8 sedan, manual option 2G body kit but now wears the Rebel kit 1997 EL GT Sparkling Burgundy, sunroof, auto. Our former Tickford cars: 1997 XH11 XR8 1998 AU XR8 manual sedan 1999 AU XR8 manual ute 2002 AU XR8 auto sedan, sunroof |
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#40 | |||||||||
RIP...
Join Date: Dec 2004
Posts: 15,524
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Quote:
Most of these Falcons run on the rich side standard, therefore improving exhaust flow, actually leans the AF ratio out by small amount, getting it closer to 'correct'. Therefore producing more power, usually right across the range with a good system. Quote:
Much of this has already been pointed out. Quote:
Quote:
Many of them had almost no change in economy. Quote:
A good tune, can make quite the difference. Quote:
The header pipes may have been too big, the system might have been too big, there's too many variables here to make the blanket statement you made. We're also not talking about a Commodore, rather a Windsor powered XR8, of which there's possibly hundreds on this very forum which have made nice gains just by changing headers and exhaust system. Myself included. Quote:
The fact is, both EFI and carby's need tuning to to optimise for every change, though EFI is a little adaptable without a tune.
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#41 | ||
Regular Member
Join Date: Dec 2015
Location: West of Melbourne
Posts: 488
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Little run turned out to be a days shopping...
Ok, flat straight road. 90kph - 1750rpm 100kph - 1900rpm 110kph - 2100rpm
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Cheers Ozrider AUII XR8 200KW FG MK2 XR6 Mini 850 Rover P5 3 Litre Mk1 |
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#42 | |||
R.I.P. Maggie
Join Date: May 2015
Location: Brisbane
Posts: 1,286
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Quote:
Same as me OZ
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#43 | |||
FF.Com.Au Hardcore
Join Date: Apr 2009
Posts: 2,215
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Quote:
I was happy going to do the exhaust and chip any road and could do it all cheaper, thinking it was just like the older engines that Holden just did exhaust mods and chip. The first VS got the 165KW and then the ute from the time the VT sedan came out got the 168KW it only had a air snorkel and maybe a little different tune, but a bloke I know who had the 165 before his 168 claimed his old 165 performed better. the 185KW stayed the same. The stock VT 179KW performed better than my stock 179KW ute because the ute only had the crappy single exhaust, so the fact is that them ute's did not truly have 179KW, Holden some how got away with claiming this. the ute should of got the twin exhaust as well. |
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#44 | |||
FF.Com.Au Hardcore
Join Date: Apr 2009
Posts: 2,215
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Quote:
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#45 | |||
FF.Com.Au Hardcore
Join Date: Feb 2008
Location: Perth, Northern Suburbs
Posts: 4,889
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Quote:
Cheaper to buy a new car, than run it on 98. |
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#46 | ||
FF.Com.Au Hardcore
Join Date: Dec 2004
Location: Perth NoR
Posts: 5,970
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Highway mpg with my ratio swap from 3.45 to 3.91s improved. With the T5 in 5th I sit on around 2500 @ 110kmh.
The OP said he doesn't want to ruin the national economy, no mention was that that it needs BETTER economy than standard... Headers, cats, diff gears & a proper retune of the ECU (not a mailorder chip) will be the best improvements you can do without ripping the engine apart. Cheaper to buy a new car than 98 octane? WTF are you buying it by the super tanker? |
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#47 | ||||
RIP...
Join Date: Dec 2004
Posts: 15,524
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Quote:
I know what it does to economy. How many have you done? Quote:
![]() I can run all my cars on 98 fuel for the next 30 years and still be cheaper than buying a new car.
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#48 | ||
Regular Member
Join Date: Jan 2006
Location: Sydney , N.S.W
Posts: 427
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I also changed to 3.91 gears and there was no change in fuel economy around city or on the freeway.
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#49 | ||
Sick Puppy
Join Date: Jul 2006
Posts: 1,963
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When i went to 3.9s in my old ute with the 5 speed around town economy improved and i used 0.5 of a litre more per hundred on freeway running.
The first thing ill be doing with the missus 5.0 AU when i seriously start to play with it will be diff gears. |
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#50 | |||
FF.Com.Au Hardcore
Join Date: Feb 2008
Location: Perth, Northern Suburbs
Posts: 4,889
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Quote:
As I said, it depends what the OP wants to use the car for. Like many things in a car, gear and diff ratios are an exercise in compromise, trying to achieve the optimum balance. Ex-factory, Ford can only aim to cover the needs of most owners. In the past few decades they have probably tried to err on the side of reportable economy figures, rather than 0-100 times. (That said, my XR4 is ridiculously short, if only changing FWD diffs was that simple.) OP wants "more torque" and shortening his diff will give him more torque at the rear wheels. It will also hurt his highway cruising economy. Up to him if that is an acceptable compromise. |
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#51 | ||
Sick Puppy
Join Date: Jul 2006
Posts: 1,963
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To loose half a litre per hundred kms on the freeway is hardly a lose of highway economy. Especially overall when it improved 2 litres to the hundred around town.
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#52 | ||
R.I.P. Maggie
Join Date: May 2015
Location: Brisbane
Posts: 1,286
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I run mine on 98 I don't think its that much of a difference
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#53 | ||
Peter Car
Join Date: Dec 2004
Location: geelong
Posts: 23,145
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I didn't notice any loss of economy on the highway with 3.9's. Not enough to be noticeable anyway. Was better around town though and I did check the economy every time I filled to see.
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#54 | ||
FF.Com.Au Hardcore
Join Date: Apr 2012
Location: Adelaide
Posts: 2,802
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Lets face it anything that is going to get the car moving better is going to cost fuel economy, except probably a tune, the rest is to go faster.
Get some 3.9's the fun makes up for the lighter wallet! Besides the btr gears ratios are crap! Speaking of that, convert it to manual! gears will feel even better then, and if you baby it would probably get even better fuel economy, or t56 conversion better again!
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#55 | ||||
RIP...
Join Date: Dec 2004
Posts: 15,524
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Quote:
Shorter gearing typically requires less throttle opening to make a car accelerate at the same rate it did before. Therefore using less fuel. An engine that produces more torque at lower revs, will also typically use less fuel. Again, due to lighter throttle opening for the same rate of acceleration. Same goes for the highway, less throttle opening to maintain speed. Naturally once you really want some get up and go, and you use that go, then you will start using more fuel. The other common problem is, many people go too big on exhaust, cams and other things, only to make good power up top, but have lost a good amount down low. They can suck fuel pretty hard. Quote:
I reckon the manual doesn't really need shorter gearing for the road, at least not as short as the BTR.
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#56 | |||
FF.Com.Au Hardcore
Join Date: Apr 2012
Location: Adelaide
Posts: 2,802
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Quote:
Shorter gears definitely make it fun and definitely no real down side, a mate of mine still pulls 260kmhr with a t56 and 4.11 so you definitely dont run out of legs haha, while first becomes extremely short, it cruises nicely if you need it to and can cruise at low rpm in 60/80 kmh zones, at 100km revs start getting up there but still better than auto rpm level. I suppose another option is Miami swap, better fuel economy and power, win win.
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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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#57 | |||||
RIP...
Join Date: Dec 2004
Posts: 15,524
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Quote:
If you drive it much the same as you did though, economy will likely improve. The same throttle input as before will have you accelerating slightly better. The car has become more efficient. Quote:
You can always find the right gear easily. Quote:
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#58 | ||
FF.Com.Au Hardcore
Join Date: Jan 2005
Location: Wollongong
Posts: 3,111
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i tried all the generic bolts on to get more from my old AU3 XR8 but gears would have been the best thing, I have full exhaust with pacemaker 4-1 and hi flow cats, CAI but it was auto and was a bit of a dog unless you were 3500rpm plus but them it would run off power at 5500rpm.
in my old EB 5l i did a cam and 3.9 gears and that would have smashed the AU anyday.
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#59 | |||
Peter Car
Join Date: Dec 2004
Location: geelong
Posts: 23,145
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Quote:
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#60 | |||
Regular Member
Join Date: Dec 2015
Location: West of Melbourne
Posts: 488
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Quote:
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Cheers Ozrider AUII XR8 200KW FG MK2 XR6 Mini 850 Rover P5 3 Litre Mk1 |
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