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The Pub For General Automotive Related Talk |
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12-07-2012, 02:36 PM | #1 | ||
Starter Motor
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Hi Guys I am new to the forums.
I was wondering what mods would be needed to make and ED XR8 start to beat an ED XR6 that already has Extractors and a good exhaust? Also would these mods hamper fuel economy or better it? |
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12-07-2012, 02:48 PM | #2 | ||
Banned
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exhaust and extractors should make it more fuel efficient but people have a tendency to rev it due to the better noise and ruin that haha
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12-07-2012, 02:56 PM | #3 | ||
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just get the diff gears upgraded to 3.45 ratio like XR6 and done. You have more power and torque in the 8 and at a wider power band and the ratios are now level.
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12-07-2012, 03:11 PM | #4 | ||
meh.
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It's an ED XR8 hulk, it's already got 3:45, same as the XR6
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12-07-2012, 03:33 PM | #5 | ||
Forum Director
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/me shakes head at HULK BA - Back to the desktop racing my friend.
Might I suggest a course in power to weight, as well as comparing complete gear ratios (not just diff) The ED XR8 came from the factory with 3.27, the XR6 with 3.45. The manual g/boxes between the XR6, & Xr8 had different ratios. The Auto boxes were identical between 6 & 8. |
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12-07-2012, 03:46 PM | #6 | |||
FF.Com.Au Hardcore
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12-07-2012, 03:50 PM | #7 | ||
Where to next??
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I remember there wasn't much between the 6 and 8 kw wise (something like 157kw and 165kw??) but what about torque??
8 would have weighed a little more as well I assume.
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12-07-2012, 04:02 PM | #8 | ||
Starter Motor
Join Date: Jul 2012
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161 kw 365.5 nm XR6. XR8 165kw 388 NM. I know from wheels mag Write up done on the EB XR6 vs EB XR8 they reckoned the XR6 was only 7kg lighter whether that's true I dont know. This Comparo is auto to auto btw.
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12-07-2012, 04:05 PM | #9 | ||
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The OP didnt mention auto or manual.
I assume the OP is talking about minimal mods to beat the XR6. Otherwise people would say, stroke it then supercharge it and then it will beat a ED XR6. We are talking about minimal mods. Change diff gears and it will do the job on the XR6. The Gli 6 cyl has the same ratios as XR8 and guess what.....its slower than the 8. 3.45s in the XR6 and bingo its got more performance. Dont fool yourself to think the extra 4kw in the XR6 motor makes all the difference over the GLi. ED XR8 has 3.27s. Put the 3.45s in the XR8 ED and it will beat the XR6. I know first hand. Ive put this ratio in 3 windsor V8s, EB, EF and EL 165kw motors. Ive also owned a EL Ghia (with XR6 3.45 diff and Xr6 motor). The 8 with the diff gears and all other mods equal will take out the XR6 ED. Currently drive a 96 LTD 5.0 with 3.45s and extractors/cats/exhaust/intake. It will take out the EL ghia with same mods and same diff gears. Last edited by RAPID_BA; 12-07-2012 at 04:11 PM. |
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12-07-2012, 04:06 PM | #10 | |||
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12-07-2012, 04:21 PM | #11 | ||
Starter Motor
Join Date: Jul 2012
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Standard ED GLI 148kw 348 NM vs 161KW and 365 NM that is quite a noticable difference and its alot more then a gear ratio.
Revised Porting for improved gas flow,Boost in Compression and change in camshaft profile and timing along with upgraded valve springs and increase in fuel pressure from 300kpi regulator. The ECU was also reprogrammed in them for more power and sharper shifts (for automatic). Not saying that an XR8 with the same ratios wont be an XR6 but I am saying that you cant put a GLI in the same category as an XR6. the motors are very different. |
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12-07-2012, 04:44 PM | #12 | |||
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12-07-2012, 07:08 PM | #13 | ||
BUILT FORD TUFF
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If you compare the 2 with the same gearbox than the xr8 only needs extractors and exhaust and decent air intake plus a bigger maf. My mate had an EB XR8 and it whipped out a 14.4 quarter which was fast enough to blow off xr6's and the VN to VS SS commodores. Those that have the EB/ED XR8 manuals would already know that they respond well to mods. The small HO manifold and E7 Heads give great torque due to the high air speed at low revs even though they fall over up top due to the same reason
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12-07-2012, 07:24 PM | #14 | ||
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These are now 20 year cars and the biggest factor will be which is in better mechanical condition.
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12-07-2012, 07:32 PM | #15 | |||
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12-07-2012, 07:43 PM | #16 | ||||
Rob
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the 8 box has very similar 1st and second gears and a shorter 3rd. changing the diff makes the overal ratio shorter. i believe what hulk has suggested is correct. the OP wasn't asking how to do a 14sec 1/4. to jog the memory of some.. Quote:
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12-07-2012, 07:43 PM | #17 | ||
Starter Motor
Join Date: Jul 2012
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Hey Martin do you still have any of the old wheels/motor mags from EB/ED vintage.
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12-07-2012, 08:18 PM | #18 | |||
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12-07-2012, 08:29 PM | #19 | |||
Rob
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12-07-2012, 08:39 PM | #20 | ||
Peter Car
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Location: geelong
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Going from a 3.23 to a 3.45 diff ratio does bugger all, its hardly even worth doing cause the difference is so small. Better off going to a 3.7 or 3.9 that will make a huge difference.
But a good cold air intake, filter, extractors and exhaust will have the 8 killing the 6 for minimal dollars. A proper low diff ratio isn't needed but certainly worth doing. |
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12-07-2012, 08:44 PM | #21 | |||
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12-07-2012, 09:08 PM | #22 | ||
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The easy comparison is to look at au xr8 185kw vs au xr6..
They fit the 3.45s to au xr8 and suddenly its quicker than xr6 and holden 5.0v8 Sure the au xr8 has a few kw more but only at redline. Compared to previous xr8s the 3.45 gears was the big kicker in performance. Fit the 3.45s to pre au xr8s and a decent exhaust and you basically have au xr8 185kw equivalent performance. (quicker than a xr6) |
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12-07-2012, 09:12 PM | #23 | |||
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12-07-2012, 09:14 PM | #24 | ||
Performance moderator
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I still own both cars,,Yes the ratio is taller on the V8..
Yes 3:7 would be better option given that most these cars have 17" wheels on them now.. Changing heads [GT P's] and MAF would be my next option... Atleast a good set of valve springs given the age...
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12-07-2012, 09:40 PM | #25 | |||
Peter Car
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Location: geelong
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Try driving one with 3.7 or 3.9's and then come back and comment. Makes a real difference, not a barely noticable one. |
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12-07-2012, 09:43 PM | #26 | ||
Rob
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hulk owned one with 3.9's.
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12-07-2012, 09:44 PM | #27 | ||
Peter Car
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Then he should know.
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12-07-2012, 09:46 PM | #28 | ||
Rob
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Location: Woodcroft S.A.
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he does. he isn't saying that 3.45's are better than 3.7's or 3.9's.
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12-07-2012, 09:55 PM | #29 | |||
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I found the 3.45s or maybe 3.7s best overall. takes off well enough with 3.45s or 3.7s whilst keeping some legs as well for highway. They dont rev out too hard so dont wanna shorten them up too much. 3.9s will obviously take off harder but id say need some cams and revs to keep some legs. Will pay a bit more on the highway with 3.9s, but brutal off a set of lights. not everyones cup of tea. But the question OP asked is what is required to walk away from ed xr6. 3.45 diff gears will do the trick, 3.7s and 3.9s make a mockery of the xr6 ed Last edited by RAPID_BA; 12-07-2012 at 10:08 PM. |
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12-07-2012, 10:25 PM | #30 | |||
Rob
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