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#1 | ||
Starter Motor
Join Date: Jun 2005
Posts: 21
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Hi guys first post for me.
Have an AU3 with a 5 litre. Recently got a set of extractors and 2.5" twin exhaust which made a bit of a difference in low end torque. I then got a custom CAI run off the front of the airbox and a performance filter. The airbox mods made the engine come to life it revs a lot quicker now. Only trouble is now I seem to have a flat spot in the rev range around 3000 rpm. Would this be a tuning problem? I find it strange that the power drops out just below 3k and then boots back in at about 3500 Is it true that the computer is self tuning? Someone told me if I disconnect the battery to reset the computer it might rectify itself...? |
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#2 | ||
FF.Com.Au Hardcore
Join Date: Apr 2005
Location: Perth
Posts: 936
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dunno about the flat spot mate but if you go to www.aufalcon.com it gives instructions on how to correctly reset your computer after disconnecting the battery.. worth a try!
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#3 | ||
Back on the road
Join Date: Dec 2004
Location: Wollongong, NSW
Posts: 3,205
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Auto or manual? Sounds like the factory EEC torque "control"...
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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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#4 | ||
Silhouette AU1 TS50.
Join Date: Dec 2004
Location: Radiator Springs, Victoria.
Posts: 2,135
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Firstly..
![]() Is it AU3 XR8 or other? Might be the exhaust system. What type of headers you got? 4-1 (tuned), or 4-2-1 (tri-Y)? What brand name? Also.. is it a twin 2.5" from the headers right to the tips, or 2.5" into a Y connection and a single pipe under the diff? 4-1 headers and twin 2.5" from start to finish is not the best system for a standard 5.0 AU. You will loose power down low in the rev range. That system is more suited to a stroked or supercharged 5.0.
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"People can have the Model T in any colour.. so long as it's black." HENRY FORD (30/07/1863 - 07/04/1947) PIC'S OF MY T1 TS50.
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#5 | ||
Starter Motor
Join Date: Jun 2005
Posts: 21
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xr8 ute: it's manual (its a ute too
![]() 012: cheers! AU3 XLS... They're pacemakers, pretty sure they are 4-2-1... it's 2.5" from cat back twin system straight through are you saying there might not be enough back pressure in the exhaust? ![]() i drove it for a couple of weeks with no problems after the exhaust was done it was only after airbox mods that the flat spot appeared. I'm going to reset the computer and see how that goes... |
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#6 | ||
Starter Motor
Join Date: Jun 2005
Posts: 21
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double post
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#7 | ||
beep beep
Join Date: Dec 2004
Location: Melbourne
Posts: 1,971
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money is on torque control from the ECU...
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Nothing to see here, move along, move along... |
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#8 | |||
Silhouette AU1 TS50.
Join Date: Dec 2004
Location: Radiator Springs, Victoria.
Posts: 2,135
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Quote:
The computer takes a while to re-learn after a exhaust system is fitted to your engine. So you will not feel an instant rush just after fitting a sports exhaust system.
__________________
"People can have the Model T in any colour.. so long as it's black." HENRY FORD (30/07/1863 - 07/04/1947) PIC'S OF MY T1 TS50.
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#9 | ||
Smile
Join Date: Dec 2004
Location: Merrylands Sydney
Posts: 8,540
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Firstly..welcome to the forums...its always great when we get new people posting .
I have been to quite a few dyno days and the typical air fuel ratio is similar in both au v8 's and 6 cylinder models. If you have a look at my old curves you will see that they go really rich and finally start to get a bit leaner.This would explain the flat spot. Get a unichip to fix the problem.I recommend Spiro at AUTOTECH ENGINEERING IN Sydney Here is a before and after for you to look at http://photobucket.com/albums/y119/u...t=Scan0001.jpg
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Stingray Car Security ph 0414445444 Single din radio fascias for fg to fgx fords Australia wide . FG 1 2 and 3 gauge holder in stock now! https://stingraycar.com.au/shop/ Site Sponsor See Sponsor Stingray Car Security 😍👌✌ AU wagon 6 14.241@96.75 1/4 mile sold.Octane fg xr6 turbo!! 12.312 112.21 mph home tune f6 injectors gone ..now in nitro fgxr6t ready to go again ![]() |
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#10 | |||
Back on the road
Join Date: Dec 2004
Location: Wollongong, NSW
Posts: 3,205
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Quote:
Is that a VN SS in the driveway? I have very fond memories of one of them...
__________________
------------------------------------------------------------------------- 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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#11 | ||
Starter Motor
Join Date: Jun 2005
Posts: 21
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cheers bro, where can i find a pic of your beast?
good spotting, have many fond memories in that car also. |
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#12 | |||
T3/Sprint8
![]() Join Date: Jan 2005
Location: Australia
Posts: 16,352
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Quote:
Mine had the same flat spots which peeeved me off, chip sorted it out.
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Tickfords T3/TS50 '02 Sprint8 manual Sept 24 '16 Daily Macan GTS "Don't believe everything you read on the internet. Abraham Lincoln" |
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#13 | ||
Starter Motor
Join Date: Jun 2005
Posts: 21
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seems he's not so useless after all then
I'm not in Sydney unfortunately but I'll go back to the place who did my intake and see about a unichip cheers Jez |
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#14 | |||
Back on the road
Join Date: Dec 2004
Location: Wollongong, NSW
Posts: 3,205
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Quote:
But close your eyes and magine an immaculate AU1 XR8 ute in black, with factory sportsbar, and otherwise completely stock. Well mine is like that....only covered in dirt, some paint chips/scratches, a dent in the bonnet from when the engine mount broke, a bunch of gutter scrapes on the stock 17" rims, clear side indicators, and a bit of rubber on the rear guards from last time at the track (over 2 months ago!!) I'll clean it up and post some picks one day ![]()
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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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#15 | ||
FF.Com.Au Hardcore
Join Date: Jun 2005
Location: Brisbane
Posts: 1,029
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Since you have played around with your exhaust,check that your oxygen sensors are ok. Had this problem (though I think the flat spot came in a bit earlier than 3000r.p.m.). Could be too much gasket sealant used. Also could be fuel used. Mine gave me hell when using Vortex,changed to Optimax and no problems since.
Just a couple of other things to think about!
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We salute those brave souls that enter the DARK side |
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#16 | ||
Starter Motor
Join Date: Jun 2005
Posts: 21
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Well we can put this one to rest... Give lotus the prize for the check oxygen sensors option. One of the guys who fitted the CAI disconnected the air flow sensor cable and forgot to put it back when he finished.
Not suprisingly it was running like S**t in comparison to now with the sensor working again. Case closed! |
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#17 | ||
Smile
Join Date: Dec 2004
Location: Merrylands Sydney
Posts: 8,540
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So your air fuel ratios would have been totally stuffed
__________________
Stingray Car Security ph 0414445444 Single din radio fascias for fg to fgx fords Australia wide . FG 1 2 and 3 gauge holder in stock now! https://stingraycar.com.au/shop/ Site Sponsor See Sponsor Stingray Car Security 😍👌✌ AU wagon 6 14.241@96.75 1/4 mile sold.Octane fg xr6 turbo!! 12.312 112.21 mph home tune f6 injectors gone ..now in nitro fgxr6t ready to go again ![]() |
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#18 | |||
Back on the road
Join Date: Dec 2004
Location: Wollongong, NSW
Posts: 3,205
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Quote:
As useless just said, your AFR's would have been e. Glad it's back on track ![]()
__________________
------------------------------------------------------------------------- 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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