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24-12-2006, 08:43 AM | #1 | ||
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Join Date: Dec 2004
Location: Merrylands Sydney
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Does anyone know what rpms the bottom end is good for on the au six ?
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24-12-2006, 08:56 AM | #2 | ||
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Join Date: Jan 2005
Posts: 1,892
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i have an au bottem end in my eb, With gas theres no rev limit, it see's 6500 (needle on dash) a fair bit and hasnt broken yet.... been trying to kill it
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24-12-2006, 09:35 AM | #3 | ||
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Location: Merrylands Sydney
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Cool. I am getting some stiffer valve springs so hopefully its duty will get me to 6200 rpm.I am planning to have a bit more power at 5900-6100rpm.
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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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24-12-2006, 10:08 AM | #4 | ||
SS Grunt
Join Date: Oct 2005
Location: Melbourne-DEER PARK
Posts: 1,091
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Theres always a little more that can be found hiding somewhere lol, N/A i think they would handle 6500 easy, with the cross bolted mains and all its fairly ridgid, The only thing i dont like about these AU 6's is the crank is a very heavy item but is counter weighted to suit. After playing around with them a bit even tho they dont give much trouble i can see a failure occuring on a conrod bolt eventually, ive measured them once they have been stripped and they are like an egg shape usually ranging between 0.0005" to anywhere around 0.0015". If something goes bang just get another one i guess.
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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24-12-2006, 10:22 AM | #5 | ||
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Join Date: Dec 2004
Location: Merrylands Sydney
Posts: 8,541
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Thanks man. I am looking at rev limt raised to 6200 rpm.My hopes are that this exhaust I am thinking about kicks very hard at 5800rpm and up. It should be just what the doctor ordered.
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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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24-12-2006, 03:45 PM | #6 | ||
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Join Date: Jan 2005
Location: North Brisbane
Posts: 1,151
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i used to run my AUI6 around the 6000rpm mark on standard injection and high lift cam without too much trouble using the XR springs. never had a hickup
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N12 Pulsar - sold Gen1 Liberty Turbo - sold VP Commodore Turbo - sold LN65 Hilux Turbo - sold EL31 Corolla Turbo - sold Ford AU Ute Turbo - sold Ford AU XR8 Sedan - 5.4l V8 Turbo (in the build) Ford BA XR6T Ute - daily driver Ford FG XR6T Sedan - cruiser do you see a general trend? I DO Can't live with it, can't live without it! |
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24-12-2006, 04:45 PM | #7 | ||
FF.Com.Au Hardcore
Join Date: Feb 2005
Location: Narangba QLD
Posts: 4,338
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what real benefit would there be from making the VCT I6 rev harder??
would you need some specific extractors and cam profile to make real use of the new higher rev limit? what about tail shaft and gearbox issues especially in the LWB models with increasing the RPM at which it spins all? im guessing a bigger fuel supply would be needed? would we need a bigger fuel pump or will the standard one suffice for the limit of our motors? hope thats not TOO many questions. but it is pretty much on topic
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24-12-2006, 09:00 PM | #8 | |||
FF.Com.Au Hardcore
Join Date: Apr 2006
Posts: 784
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afer rebuilding one ,they are definately built to handle a rev or 2 . |
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24-12-2006, 09:05 PM | #9 | ||
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Location: Wollongong, NSW
Posts: 3,205
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I think it would be the top end (valvesprings, and HLA's) that might restrict rpm more than anything else...
But rpm is pointless if the cross-section of the intake is too small, making the air speed in the ports too high to the point where it cant turn corners anymore (referred to as "sonic choke", "velocity choke", or "power limiting port area"). So...the hardware has to support it, and the airflow has to support it.
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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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24-12-2006, 09:09 PM | #10 | ||||||
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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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24-12-2006, 09:37 PM | #11 | |||
FF.Com.Au Hardcore
Join Date: Apr 2006
Posts: 784
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au2 s i6 5 spd , au series 1 xr6 hp motor, cam advanced 5*,jmm cai ,topgun leads,pacey 4480's,3 inch cat,lukey 2 1/2 sports zorst and 3.89 lsd,standard ecu. current best,14.939 @ 93.17. |
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25-12-2006, 08:57 AM | #12 | ||
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Join Date: Dec 2004
Location: Merrylands Sydney
Posts: 8,541
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The wagon occassionally does see 6000 rpm already without any dramas provided the car is warmed up.My rev limit is at 6000 currently. Dave shhh your giving everyone ideas...heheeh. Sonic choke is an interesting topic but the size of the port is not the only limiting factor. My ports are alot bigger on my new cylinder head. However there are other limiting factors which determine power band cutoff.
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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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25-12-2006, 09:42 AM | #13 | ||||
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Location: North Brisbane
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there are camshaft designs out there, where the theoretical optimum rev range go as high as 6500 rpm. Matching these requirements through thorough porting of the head, as well as modification to the intake manifold are not too hard. Biggest worry i would have is the bottom end. Due to the fact that the 4l is already a stroker from a 3.2l engine, the bore and stroke is square or close to. Looking at the RB engines, which are very rev happy, you will find its and undersquare engine, which due to its characteristics is safer to rev higher (do a google on this). The AU aready has a good main bolt and main cap design, which reduces risk of bottom end failure, however a good set of main bearing and checking the condition of rings and bores, may help to reduce the risk bottom end failure at higher stress levels. Merry christmas
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N12 Pulsar - sold Gen1 Liberty Turbo - sold VP Commodore Turbo - sold LN65 Hilux Turbo - sold EL31 Corolla Turbo - sold Ford AU Ute Turbo - sold Ford AU XR8 Sedan - 5.4l V8 Turbo (in the build) Ford BA XR6T Ute - daily driver Ford FG XR6T Sedan - cruiser do you see a general trend? I DO Can't live with it, can't live without it! |
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25-12-2006, 10:00 AM | #14 | ||
SS Grunt
Join Date: Oct 2005
Location: Melbourne-DEER PARK
Posts: 1,091
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My major concern wouldn't be the bottom end it would be the crappy 2 piece valves they use from factory with heavy springs behind them. If your worried about the bottom end i would get a BA or BF bottom end as they also have a mains girdle fitted which would help keep it all ridgid.
Merry Christmas. 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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25-12-2006, 10:08 AM | #15 | |||
Boost Addict
Join Date: Jan 2005
Location: North Brisbane
Posts: 1,151
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Quote:
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N12 Pulsar - sold Gen1 Liberty Turbo - sold VP Commodore Turbo - sold LN65 Hilux Turbo - sold EL31 Corolla Turbo - sold Ford AU Ute Turbo - sold Ford AU XR8 Sedan - 5.4l V8 Turbo (in the build) Ford BA XR6T Ute - daily driver Ford FG XR6T Sedan - cruiser do you see a general trend? I DO Can't live with it, can't live without it! |
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25-12-2006, 08:38 PM | #16 | |||
FF.Com.Au Hardcore
Join Date: Apr 2006
Posts: 784
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go for it stav , its only $595 to replace if it goes bang and thats for a sub 100k donk . trust me if mate you don't ,i'll be testing the bounderies early next year.rest asured you'l be the first to know . have a most excellent holiday all.
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au2 s i6 5 spd , au series 1 xr6 hp motor, cam advanced 5*,jmm cai ,topgun leads,pacey 4480's,3 inch cat,lukey 2 1/2 sports zorst and 3.89 lsd,standard ecu. current best,14.939 @ 93.17. |
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25-12-2006, 09:27 PM | #17 | ||
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Join Date: Dec 2004
Location: Merrylands Sydney
Posts: 8,541
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Hahah good on you Jake. I will be spinning the wagon to 6200rpm before too long ..not a worry.Hopefully it will all come together properly the first time.
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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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