eCtuning a 1997 automatic Prelude

Bindegal · Post by **Bindegal** » Mon Nov 03, 2008 11:34 am

Engine: H22A4 Transmission: 4-speed automatic. Is eCtuning this car possible? I have never done an automatic before.... For the moment I am assuming the car has a TCU but IÂ´m not really sure. Owner complains about the transmission hesitating on down-shifts and vtec switchover probably needs some attention too. Any ideas for tweaking this would be welcome

/Allan

CRX2 · Post by **CRX2** » Mon Nov 03, 2008 1:44 pm

Does the car have ATTS (Active Torque Transfer System)? Because then I think you have a problem... ATTS is controlled by the ECU when I remember correctly? The OBD1 ECU has an internal circuit for the solenoids on the gearbox. The OBD2 ECU has an external gearbox control unit?

Bindegal · Post by **Bindegal** » Mon Nov 03, 2008 2:31 pm

IÂ´m guessing no ATTS. Never seen that on a danish car. Heck, I havenÂ´t seen it on any car ever

Our cars here in Denmark are taxed so hard (180% oh yeah!) that expensive options are extremely rare. /Allan

CRX2 · Post by **CRX2** » Mon Nov 03, 2008 2:37 pm

Bindegal wrote:IÂ´m guessing no ATTS. Never seen that on a danish car. Heck, I havenÂ´t seen it on any car ever Our cars here in Denmark are taxed so hard (180% oh yeah!) that expensive options are extremely rare. /Allan

Six years ago I was in Denmark for a week or so... The only Honda's I did see were some old Accords, a few Civics 4th gen, and one ITR... ATTS was optional I guess.. Does this Lude have also the sporty automatic gearbox? There is one type of Prelude that has the option to switch between full automatic, and "manual" shift.

xenocron · Post by **xenocron** » Tue Nov 04, 2008 10:14 am

You'll need an Auto Conversion harness ($$$), OBD1 ECU (preferrable Auto P75) and the proper OBD1 TCU (i think prelude will work, LS might work as well.

stenseltizm · Post by **stenseltizm** » Tue Nov 04, 2008 12:12 pm

here's a guy that did a similar thing to an accord http://forum.pgmfi.org/viewtopic.php?t=6934 I'm assuming if you need a new tcu you'll want to get a car that has similar redlines and shift characteristics that you're looking for as I imagine they're going to be coded in the tcu (not the rev limits but shift points under cuise load etc.)