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OBD2 to OBD1 ECU Performance Options

 
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Old 01-23-2011, 01:28 PM
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OBD2 to OBD1 ECU Performance Options

I'm looking at a tuned p28 ecu and adapter harness for my '00 Lude. I've researched options extensively. The only question I have at this point before I give the tuner my current engine bolt on performance info. is, Have any of you guys benefitted from the ecu IAB mod on a stock cammed motor?

I've been to several forums checking this out and alot of guys remove the butterflys from the plenum all together. How do they work with vtec and what changes with the way IAB works when the ecu is programmed to modify the way they work?

Thanks, V1
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Old 01-23-2011, 01:51 PM
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Re: OBD2 to OBD1 ECU Performance Options

Well, they basically stay closed at low rpms giving you more low end tq and then open at higher rpms (not exactly sure when) for more high end hp. Now the thing is the P28 can not support them so once you plug that baby in your iabs will be open all the time. I personally have a chipped p28 with them open all the time and like it better. I guess all the tests have been done proving that we can make the most power without the iabs. If you do want them to function with the p28 you will have to go to a real tuner after and get it tuned on either chrome or neptune.
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Old 01-23-2011, 02:52 PM
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Re: OBD2 to OBD1 ECU Performance Options

Thanks for the perspective.

Sounds like you'd have to play with the IAB positions at various rpms so you could see the difference open and closed makes on a dyno. Just wondering if it's better to have them sync'd with the vtec activation point or if the IABs share no relationship at all with vtec function.

Class racers at the dragstrip control 4 bbl secondary opening with vacum and sometimes electrically.

I've got the Honda FSM that shows the IAB ysstem, but it doesn't offer any reading or discussion on how the system works or what it does.

Back in the day, we used to play with Dodge turbo boost with vac. line and orifice sizes to delay the vac. signal in order to build more boost.

I'm sure this sysem can be made to be adjustable. Just need to find out what the best way to do it is after I understand how it affects performance.
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Old 01-23-2011, 10:02 PM
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Re: OBD2 to OBD1 ECU Performance Options

If you pursue this further and end up needing an OBD2>OBD1 conversion harness, I have a Boomslang harness for sale that I don't need. Lemme know if you're interested.
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