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why are there no quick na sohc i6 btr autos 


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 Post subject: why are there no quick na sohc i6 btr autos
Posted: Tue Oct 07, 2014 8:51 pm 
Parts Gopher
User avatar

Posts: 93

Joined: 1st Oct 2011

Location: sydney
NSW, Australia

Hi im just wondering why there a no really quick 13 or low 14sec i6 autos?

Dont get me wrong I know the btrs have the looong 1st gear but isnt the ratio 2.39:1 the same as 1st in a c4 auto?

There seems to be plenty of 14 sec and a few 13 sec manuals but why not the autos. Surely with a decent stall and short diff gears the could achieve the same acceleration as the manuals?

Every 2nd older x model falcon has a c4 and runs quick times. Id really like my ed to run mid 14s with the btr auto but its lookin like il need the t5 to make it happen.its disappointing because 9 times out of 10 im happy with the cruisy nature of the auto and every now and the id like the acceleration of the manual.

Quite perplexing it is.



the road to hell is paved with good intentions.

 Post subject: Re: why are there no quick na sohc i6 btr autos
Posted: Thu Oct 09, 2014 7:28 am 
Getting Side Ways

Posts: 873

Joined: 1st Apr 2005

Gallery: 4 images

Ride: EF XR6 Wagon, AU2 XR6 VCT

Power: 148 rwkw

Location: Auckland
New Zealand

There aren't many, but it can be done. Here's one from the Quarter Mile Registry:

Flesh'n'Bones EL GLI 13.77 105.00 mph

Part of the reason we don't see more fast BTRs is that manual conversions are a very common mod and a cost-effective way to go quicker, so few E-series owners aiming for low ETs persevere with the automatic. Also, the older 3- and 4-speed automatics are less efficient than the 5-speed manuals of the era, so put less power to the road - often 5% less. So, a BTR would be unlikely to match the acceleration of a 5-speed manual, assuming the same power at the crankshaft. But you could get close with steep diff gears, a tight shift, and a high-stall to get to peak torque sooner - and no time wasted between gears like a manual.



95 EF XR6 wagon, 17" FTRs, DBA rotors, KYB/Koni, AU block, ported 4-angled EF head, SS Inductions, Territory intake, 10.2:1 CR, Auckland 1258 cam, PH4480 headers, no cat, Tickford 2.5", 2850rpm stall, J3 chip

 Post subject: Re: why are there no quick na sohc i6 btr autos
Posted: Thu Oct 09, 2014 8:30 am 

Posts: 14518

Joined: 7th Nov 2004

Ride: AU XR8

Location: a shit suburb in sydney
NSW, Australia

i had a ed with a btr that was running 12s. but it was turbo..
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