Honda Prelude and eCtune?????????????????

thething96 · Post by **thething96** » Thu Aug 20, 2009 5:30 pm

Hi, don't know how true this is, but I'm being told that a 99' Prelude SH with ATTS can't use eCtune? All this because with eCtune, the ATTS won't work. How true is this? Thanks.

98vtec · Post by **98vtec** » Thu Aug 20, 2009 6:54 pm

its not just ectune. Its the fact that you have to run an OBD1 computer to be able to run ectune (just like all the other OBD1 tuning systems). When you remove the factory SH computer, the atts computer does not work and renders the ATTS unit dead and inoperable.

thething96 · Post by **thething96** » Fri Aug 21, 2009 5:55 pm

Even though OBD 1 ecu's can't support the ATTS, will the vehicle still run with a non-working ATTS?

Post by **calvin** » Fri Aug 21, 2009 9:18 pm

ATTS?

98vtec · Post by **98vtec** » Sat Aug 22, 2009 3:24 am

thething96 wrote:Even though OBD 1 ecu's can't support the ATTS, will the vehicle still run with a non-working ATTS?

yes, it will become dead weight. ATTS is essentially an electronically control clutch unit for the axles. Active Torque Transfer System.

thething96 · Post by **thething96** » Sun Aug 23, 2009 1:48 pm

Thank you very much for response.

Post by **calvin** » Mon Aug 24, 2009 11:41 pm

i have ran ectune in JDM prelude with tiptronic

borat · Post by **borat** » Tue Aug 25, 2009 6:34 am

SportShift != ATTS Also, Tiptronic == Porsche, SportShift == Honda. ATTS is an active differential system that can send torque back and forth across the axle. It relies on its own computer, and is therefore incompatible with ECU swapping. It's still in use today on vehicles such as the Acura TL SH-AWD: http://en.wikipedia.org/wiki/SH-AWD#Development Should I be worried that all of this needs to be explained to someone who specializes in Hondas?

Post by **calvin** » Tue Aug 25, 2009 7:28 am

not at all i guess.... i'm not god...

98vtec · Post by **98vtec** » Wed Aug 26, 2009 5:38 pm

borat wrote: Should I be worried that all of this needs to be explained to someone who specializes in Hondas?

the prelude is the red headed step child of honda performance....

thething96 · Post by **thething96** » Thu Aug 27, 2009 5:29 am

As far as I know, the only way to tune a Prelude with ATTS and still retain it would be with a Greddy E-Manage or a VAFC. Doesn't seem like it would be impossible to have eCtune able to activate the ATTS, right?

relic1 · Post by **relic1** » Thu Aug 27, 2009 11:13 am

there is a communication line between the ECU and ATTS unit that needs to be there. I'm not sure what it communicates or what protocol it uses, but without that the ATTS is dead. I've been working with a guy that has an ATTS Lude that he's looking to build up a little, the car is currently not running or I'd have more info on the communication between the ATTS and ECU.

TheGuardian · Post by **TheGuardian** » Thu Aug 27, 2009 11:30 am

thething96 wrote:As far as I know, the only way to tune a Prelude with ATTS and still retain it would be with a Greddy E-Manage or a VAFC. Doesn't seem like it would be impossible to have eCtune able to activate the ATTS, right?

Another, supposedly better, alternative to the e-manage or the VAFC would be AEM's F/IC. For a piggy back controller its actually fairly flexible... More info: http://www.aempower.com/ViewCategory.as ... goryID=116 Although if someone could figure out the purpose of the ATTS communication line to the ECU and emulate it, we'd be golden.

borat · Post by **borat** » Thu Aug 27, 2009 10:20 pm

AEM F/IC would be the way to go if you have to have ATTS. However, I've heard that ATTS starts acting up at around 250hp, so it's probably better to get rid of it anyway. http://www.honda-tech.com/showthread.php?t=2307566