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Old 05-26-2003, 22:16   #1 (permalink)
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FPV/XR Gearing

I'm going to fix this diff ratio issue with my Pursuit since it won't pull the 3.23 on the highway. Found out that a possible reason the XR8/FPV vehicles are slower than we'd like is that Ford had to wind back diff ratios on the Boss engines to get them through the drive by noise certification.

I guess they had the choice of the note and nice noise or putting in a shorter diff and having it sound like a vacuum cleaner per LS1s. The guy even said if he bought one of these cars he'd do a diff ratio change right away!

Got this info from Ford so please don't disclose elsewhere.
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Old 05-26-2003, 22:36   #2 (permalink)
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Great info AP. So any ideas as to the improvements this will make?

Doesn't it seem strange that it is because od noise regulations that they went this way? Would it make that much difference?
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Old 05-26-2003, 23:27   #3 (permalink)
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yes would be very interested in this gearing change
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Old 05-27-2003, 05:47   #4 (permalink)
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Ahh just like back in the EF XR8 days where they were running 3.23:1 diff, and compared with the EL2 XR8 running a 3.45:1.

I was wondering why the Boss engines ran a 3.23:1, i always said the first upgrade would be to put a shorter ratio.

AP,
Not sure if it's an easy retro fit, JR looked into changing his 3.45:1 to a 3.73 and according to a few gearbox places it's not as easy as changing ratio's on previous model falcons. Something to do with the computer and Control Blade suspension which wouldn't effect your car.
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Old 05-27-2003, 05:47   #5 (permalink)
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how easy is it to change the diff ratio?
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Old 05-27-2003, 18:41   #6 (permalink)
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Quote:
Originally posted by Aussie Falcon
how easy is it to change the diff ratio?
Stay tuned - I'll know soon. Just trying to find out if EEC7 road speed calibrations are going to be a problem.
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Old 05-28-2003, 01:26   #7 (permalink)
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Let me know can ya pete.. It'll be the first thing I change.. So long as it doesn't cost a squillion.
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