dwilson

I have a hondata 2b on a 95 LS Drag III setup and have had it tuned, but for some reason i still get hesitation. Is anyone else having this problem? It is all thru the rpm range, but only if im cruising at highway speeds and engaging and disengaging the gas peddle slightly. It is aggarvating as hell. Any of you old timers that been running hondata for a while ever had this problem?

Arturbo

Hondata seems to have that problem.

art

VaporTrail

I know how to fix it, but i'd need your map to do so

Arturbo

BTW john, I need the map..hehe

Cramerox

does it have to do with running a p72 map? Ide like to know also how to fix the problem....if you care to share please.

ekb18c

What is this hestation problem that I have been reading about? I never had one customer complain about it with any of the hondata system in their cars. I'm pretty sure it's not hondata, it's probably more like your map is messed up. It could be that the transition b/t the low speed and high speed fuel maps are not matching up good. I keep reading about hestation problems but I have never experienced it ever. Can someone send me their map, that experience hestation problems, so I can take it look at it? Email is in my profile.

Thanks.

Rory Breaker

If youre talking about the little "stutter" at cruising speeds...I have the exact same problem with my S200B.

How can we get rid of it?

Farnsrocket

It's your A/F ratio.......need a wideband to see it.

philo

i've installed or tuned a bunch of them and given my map to even more people and never heard of this, but then i have an FJO. my guess would be a under fueling problem, probablly tip-in multiplier.

dwilson

I have been to the dyno and spent 350 dollars to have tuned. The a/f ratio is around 12.0 to 11.5 all the way across the rpm range and i still have the problem.

Farnsrocket

Did they use a sniffer in your tailpipe to read A/F?

HXMan

I had that problem too. ANNOYING!!

vtec.dc2

if you all reffering to partial throtle, then it has to do with a/f ratio while cruising, from hondata website:

start quote ------------

Tuning part throttle usually takes me 2-4 times longer than full throttle tuning. If you just tuned for full throttle on the dyno, then you're only half way there.

First check that your TPS is adjusted correctly, as this can give cut in/out problems, but usually only on very light throttle.

The problem is closed loop operation. If you have one area of the fuel tables which run either rich or lean, then eventually the long term fuel adjustment will go the other way to compensate. e.g. if you're running rich at cruise, then the long term adjustment will take fuel out. This is fine as long as the whole fuel table is the same mixture. If the fuel table is 'bumpy' mixture wise, then when you change rpm or load to another area, the mixture can go quite rich or lean under closed loop operation and you'll get some sort of hesitation. The worst case is where you have a rich and lean spot close to each other. Say you run in the rich spot so the long term adjustment takes out 20% fuel, then change speed so you're in the lean spot. The lean spot is now 20% leaner again thanks to the long term adjustment, and you'll experience hesitation.

The solution is to tune part throttle with close loop switched off using a wide band lambda meter. You must tune to 14.7:1 where ever the ECU will run closed loop, as it will adjust the mixture to 14.7:1 there anyhow. Once you are done, switch back into closed loop, and datalog the short and long term mixture adjustments to see how well you have done. Short term adjustment should be -10 to +10%, and long term should be from -7% to +7% BTW you don't have to run closed loop - sometimes you want to run richer mixtures than 14.7:1 at part throttle to keep the turbo temperature down.

------------------ end quote

larger injectors also contribute to that since they run minial while at partial throttle, and make that punch effect if you hit the throttle

dwilson

Yeah they used a sniffer i guess. it was a wide band, i had a extra bong welded in my dp and then they attached it their. I dont think might tuner is doing something right. From the quote below it sounds like he is just tunning me for open loop and then just making it rich enough so i dont run lean during close loop and calling it a day.

justinCO

Part throttle wideband tuning is key. Servion and I spent a day tuning my car a couple weeks ago and made huge improvements over the basemap that I was running. I want to fine tune the car some more, but I don't have any hesitation at all.

Justin

DIRep972

iTrader: (1)

my hondata doesnt have that problem.

dwilson

I dont know, but it is driving me crazy. I guess im going to have to make the 10 hr. drive and go let Vapor Trail have a go at it. I am planning on upping the boost in a couple of months anyways, just hate the damn drive


[Modified by dwilson, 9:25 PM 11/28/2002]

Cramerox

i know this has been discussed before i just cant find the thread. Some guy had the same problem with hesitation with the p72 base map...what someone did was use a base map from a diffrent car...like for example p28 (not sure tho) but it solves the problem.....I think dustin knows what im talking about.

KOTSEMOTO

Hondata doesn't have that problem. Most car will have this problem with their standalones because of poor part throttle tuning. Most dynos are WOT tuning only. That's why VAPORTRAIL charges a reasonable price. Read his thread.