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28-01-2007, 11:22 PM
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Regular Member
Join Date: Nov 2006
Location: Perh
Posts: 311
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Hey Guys
Just trying to decide on whether or not to do the diff ratio change on my 200kw AUII XR8 Auto. I am looking to get the old girl moving off the line a bit better have got the exhaust and will get the tune was going for the ratio change just need some real life feedback rather than whats in my head. She is a daily driver about 350ks per week going for the flash tune soon so was going to do the ratios first then tune but would like some feedback. How Does the car pull with the 3.9s compared to standard ? What are the RPMs at say 110kph just rough its 13% i think so i would be at 2375rpms? How would she perform down the 1/4 with 3.9s ? Any dramas with the auto and the higher ratios? Thanks Dave |
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28-01-2007, 11:33 PM
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SS Grunt
Join Date: Oct 2005
Location: Melbourne-DEER PARK
Posts: 1,091
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Hey mate i have the 3.9's in a daily and cant be happier i also have a 3000stall which helps, my rpms are about 2300rpm which is close to what you worked out, 2250rpm which is stuff all. I would say do it you will be happy as its not just the take-off that changes it just makes it a whole lot snappier around town. No 1/4 as yet but soon.
I used a Jaycar correction unit to adjust the speedo and the series 2 is coming out soon. Shaun
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The Beast has gone to a new home Morpheous VE SS 6LTR 6speed Manual in its place, Leather, Lowered, 20's, Ramjet OTR and Dual 3inch, 280RWKW I will also enter any part of the Forum I wish to enter.  :
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29-01-2007, 12:09 AM
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#3 | ||
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Regular Member
Join Date: Nov 2006
Location: Perh
Posts: 311
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Thanks Shaun
I was just tossing up whether the $900 to swap the diff over was going to give me a good bang for buck type mod. Or spend a grand on something else to make her pull hard. You got any other ideas. Leaning towards the diff tho Lol to many hard decisions Thanks |
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29-01-2007, 06:39 PM
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#4 | ||
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SS Grunt
Join Date: Oct 2005
Location: Melbourne-DEER PARK
Posts: 1,091
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What mods have you currently got? so i can see what we are dealing with
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The Beast has gone to a new home Morpheous VE SS 6LTR 6speed Manual in its place, Leather, Lowered, 20's, Ramjet OTR and Dual 3inch, 280RWKW I will also enter any part of the Forum I wish to enter. :
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29-01-2007, 07:45 PM
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#5 | ||
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Regular Member
Join Date: Nov 2006
Location: Perh
Posts: 311
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So far all i have is the SS intake system K&N filter soon to put another hole in the bottom of the filter box.
Have the liverpool 21/2 exhaust system including the hurricane headers and cats. External Auto cooler Dave |
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29-01-2007, 09:37 PM
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#6 | ||
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Back on the road
Join Date: Dec 2004
Location: Wollongong, NSW
Posts: 3,205
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For me, I noticed the 3.9's made the car feel much better between the gears, but from a standing start I could hardly tell the difference...but maybe that is just the stock tune pulling timing in 1st gear?
Most of my driving is 110km/h highway stuff, and the increase in revs is not the least bit noticable. No dramas with the auto, it shifts exactly how/where it used to. Obviously the speedo is out a bit and my speed limiter cuts in sooner. 3.9's certainly make it feel much more "toey" between gears, but didn't give me any extra urge from a standing start....60 foot times at the track are the same. If thats really what you want then you may be better off with a higher stall converter?
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------------------------------------------------------------------------- AU XR8 Ute 13.90 @ 100mph - http://www.aufalcon.com/xr8ute 5L Windsor, GT40X heads, Crane 2030, Pacey 4-1s, Lukey 3", 3.91:1, auto. Tuned by me w/Quarterhorse and BinaryEditor. Coming Soon: Ported lower intake, Tickford "Premium" Brakes, and a good wash. |
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Who is running 3.9s on a daily driver?
Linear Mode
