at least it appears that way for now.

I had tried every combination and permutation of timing and fuel curves to try and get rid of this annoying hesitation that occurs at exactly one specific manifold pressure of about -380mbar.

I was ready to take off my intake manifold, get a new throttle body (which I may do anyway if anyone has a nice used one like a JG or an Erick's to sell), port out and touch up some supposed lip inside the skunk2 manifold that skunk2 told me about.

Well, Doug emailed me today and suggested something so simple, something I hadn't tried. For those of you with this problem running P72 ecu, export your tables, make a new ROM file using a P28 program as a base. Set everything to what you had before (ie rpm values, boost tables, etc) then import your tables from before.

Hesitation GONE!!


What's strange is that I tuned a gsr a few weeks ago running a p72 ROM and that ran so well. Perhaps something is different in that it was an OBD2-OBD1 conversion? Who knows at this point.

I guess Doug has his work cut out for him to try and answer WHY this happened. Months of grief for me. I was about to start saving up for the AEM at this point. Well, I love my Hondata again so I hope I can help renew the faith. I applaud Doug again for his diligence and great customer service! I'm waiting for him to call me back now so I can tell him it worked.

Torin


[Modified by GruvyTune, 7:30 PM 6/13/2002]

 

Sweet!

 

 

Ahh, so it's a bug in the P72 roms?

 

you got it!

 

somewhat glad to hear it but.....i have a p72 ....but it i have to do a conversion so i might not get it...infact i wont get it....since my hondata is up for sale to buy the aem...hmm.maybe I should keep it now??????
i dunno....damn.

 

Gruvy your my hero! lol

 

I dunno? the hondata system is really in many ways better than the AEM if you are not going to be adding any additional sensors to the engine. If you are looking for a daily driver then the hondata really like having the stock ecu just made able to adjust for turbo and give you the ability to acurately tune your ignition and fueling. The AEM certainly is sophisticated in many ways and may be more versatile. If I was going to be building up a race engine from the ground up I would probably opt for something like the AEM. In any case, for the money (550 bucks) the Hondata 2B will do everything you need. I hope Doug can figure out this issue and make necessary changes in the new version of the ROM and software they are creating (I'm just plain interested in an explanation!).

 

Doug actually called this one. I guess there aren't alot of people out there running GSRs with the Hondata? Or at least P72s? There are a handful of people who have had this problem. I guess I was just persistent enough. I hated that damn hesitation. It was at just the right point in the throttle that it would happen all the time while cruising on the highway. I cringed every time it would do it. It reached a point where I would just keep mashing and releasing the throttle making it happen in the hopes I would wear it out (like picking a pimple or something).

 

This is off the subject a little bit, but you <U>did</U> mention it.

Can you elaborate on this said "lip" please?

Ok, resume Hondata chit chat.

 

Ah i wish my problem was fixed. Im so interested is in the hondata detup its just to bad i cant get mine running. but i think im getting there. thanks for the help so far sonny and gruvytune.
if anyone esle has ideas check out my thread
https://honda-tech.com/zerothread?id=206936

 

To Doug and Gruvy Tune.
art

 

ok i've got a question for you -- is your idle still identical to the way it was before?
If you open up hondalogger, does it report "target idle" as the same value you entered in the rom, or does it say something like 669rpm?

as some of you may or may not know, there are different p28 base codes, some of which have problems idling and some of which don't. I got a rom with good p28 base code, and the target idle shows up correctly. However, with my original base map AND with any new p28 maps i create in the romeditor, the target idle settings basically does NOTHING, i.e. the OLD code.

if your base code appears to be the new code, can you tell me what version of romeditor you have?
Mine is 2.5.0.0, dated July 25, 2001, at 9:12 am...

-Xerxes

 

ART!
I burned out 4 of those damned pocketprogrammers before I figured out is was the emulator that was doing it!

I had them send me a bunch of the transistors to fix it as I was going to troubleshoot and bam, as soon as I figured out it was the emulator and Romeditor doing it, Doug announces the issue in an email.

that transistor is only needed to burn higher voltage chips. Or, did you burn out some other transistor?

 

Xerxes,
I have the same version of Romeditor.
I haven't tried hondalogger yet. My idle is fine though. I am still using my P72 ecu though. I have a P28 but what I am running is the P72 with a ROM initialized for a P28 only with tables imported from my initial tuning done on a P72 base ROM.

I don't know exactly what the code differences are between the two. I hope Doug can provide a bit more of a technical distinction in the code.

torin

 

Maybe it's knock sensor related...

 

perhaps? It didnt matter whether i had the knock sensor disabled or not. Not to mention, the hesitation was no where near boost levels.

 

I know, I mean in the code on the rom that handles the knock sensor, since Doug told me the P28 and P72 roms are basically identical except for the knock sensor code....

I only think the knock sensor is enabled in low rpms anyways

 

i suppose it could very well be. anyway, i'm interested in a definite answer. I'm just curious that way.

Either way, glad its fixed. Now onto other stuff that needs attention. I'm really starting to think I want one of those J&S Safeguards now. Too bad I have no money to spend. I just got married this past weekend. Time to start being responsible! My wife is 13yrs younger than me and i'm the one who acts like a little kid all the time with all the toys.

 

4 years ago i had a PMS running piggyback (obviously) on a p75 ecu. That hesitation was always there, right at cruise at 65 mph. it annoyed me sooooooo much and no matter what i did i couldnt get rid of it...

jump forwards 2 years, running a chipped p28. No hesitation at all. I guess that kills the knock sensor theory?

note: i dont use the pms anymore.

 

that may be so. Well, seems the Hondata P72 ROM file no matter how good the P72 ecu is, has a glitch when it comes to interacting with the hondata. Where's Doug? He never called me back today.


[Modified by GruvyTune, 10:19 PM 6/13/2002]

 

Whew....glad Steve (SGT) sold me a Hondata'd P28.

-Trung


[Modified by Projekt20, 6:00 AM 6/14/2002]

 

Congratulations! but damn, 13 years?? how old are u dude!

 

finally someone solved the hesistation problem.

im still waiting for someone to come up with a good map for a DRAG3 LS.

 

I'm 37! Most people think I'm 27 though when they meet me. Whatever, I feel like I'm 16 most of the time. I tame it down at work