Was wondering who else has had to send their ECU back more than four times...I send them Dyno graphs so they can see my A/F it comes back like they never look at it. I got my ecu back for a second time and my A/F was under 10.7 I had to clean my plugs.....so I called and sent the ECU back again. Got it back in and Now I am super lean from 3-5500 RPM. 17.7 and then after that is goes to about 14-13.5...

I dont know what the problem is I am getting really frustrated...I give them everything they need to know and they dont use the information I am giving them...Thank God I dont pay for Dyno's I would be out 4-500 bucks...

Any Help would be great....

 

where r u taking your A/F ratios from? exhaust pipe or Ypipe tap?

 

Where he's taking them from would be irrelevant...if he's on the same dyno and getting #'s all across the board ( 10.5-17) it wouldn't matter at all where he's pulling the #'s from.

Not to mention that the exhuast pipe readers are very accurate, not sure where people got the assumption that they weren't....every one I have seen was within .1-.2 of a o2/header bung. This is of course provided they take care of their equipment.


BTW-Why is this posted in classifieds

--wes

 

IM a dumbass, Mods please move, How this got in here I have no idea...But I am running wide open so it doesnt matter where I get it from...The readings are from the tail pipe...Chebosto, will you please talk to them, I am now going to send my ECU back them again, this time I am sending my first Dyno before ECU tuning which had a lean pocket in front and an A/F of 13.1 up high with my new one of 17.7 to 14 up high I dont understand how they can read my mods and dyno and mess this up soo bad...

 

I told you tuning by mail was a major pita. I went back and forth at least 4 times, but what are you gonna do, they are the only ones who can tweak the ecu.

 

i got an email back, regarding your problems..

they think the Tail pipe readings for A/F are probably the culprit for the inaccurate readings.. there's no way they would send out an ECU with a 17:1 lean condition...

there's alot of factors, leaks or anything abnormal in the exhaust will lead to a change in A/F... trust me. they take each of your inputs seriously. you said it was running rich, so they leaned it... but i highly doubt they would send it out that lean..

are you squeezing when you're taking these readings? im sorry you're having problems, for Mike's issue it turned out it was his custom exhaust that had caused the majority of the ECU problems we were seeing...

 

ok.. a little more update.. i spoke to danny again..

the last program they gave you is the L-SPEC program which doesn't change fuel or timing. It's the stock fuel and timing maps, only rev, speed, vtc, and drive by wire is done.

they think you have exhaust leaks. Other than that, can't really think of why it's causing that lean condition.

as far as the ECU turn around, they believe this is the second time they've had to reprogram? where is 4th time? (sorry)


also, is it true that you made 15 hp (more) in the mid range and like 20+ lbs more torque?

please dont flame me. im just trying to convey messages.. i hope it works out for you..

--Cheston

 

"got my ecu back for a second time"

No flaming neccesary, this will have been the third time sending...I asked if other people have had to send their ecu in more than four...I checked again, I do not have an exhuast leak. I will redyno again and have a bung installed to double check and run A/f closer to the motor...Yes I made more power in the midrange, but how? Only until after talking with them on several ocasions today did they admit that they in fact did a limited spec ECU and still had not credited me for the full spec that I purchased...I hope what they say is correct and I am getting a watered down reading...because at this point I will hold them responsible...Thanks for your help, I would never flame you, I know you know what you are talking about...

Thanks again.

Tim

 

well.... with that 17:1 a/f run.. you should have heard pinging.. since that is an extremely lean run, did u hear anything at all? and at what time did it go back to normal?

i think tadashi gave you a special program first time around because he saw that you had NOS, he typically riches the top end to be safe.. and you wouldnt be spraying until after 4k anyways due to traction... (am i right to assume this?)... if you're not spraying, then it should be a tad on the rich side...

originally, the first time, Fspec changed fuel and timing, so this time around, they loaded the Lspec settings....stock fuel and timing maps.. so what you're reading now on the new dyno chart should be the original stock fuel and timing maps... with the tb control and other stuff.... if thats causing the way lean condition, you'll have to go back to Fspec so that you dont blow the motor with lean and NOS..

the only thing that really makes our Z go really lean is the plenums and cats... your motor mods seem normal... i see Intake, cams, test pipes... nothing that should be crazy weird to make that A/F readout weird..

if you're makin' good power, and you're not pinging.... leaner is meaner! my suggestion, redyno, you said that there was hook ups for you. and if both of you cant come to a reasonable comprimise for the tuning... just ask for ur money back..

sorry to hear about your troubles-..

--Cheston

 

thanks for the advise, When I spray my A/F is fine...12.5 its off of spray that is the issue...I am going to redyno....and see what happens...

 

well. since there isnt a switchable map for spray / no-spray... the rich condition is going to be all the time, its when you go on the bottle. will the A/F stay around 12.xx

pm me if you need more help, since i talk to them regularly..

--Cheston

 

moved

 

Thanks Mike,

Well yesterday we drove around for a while using consult to check A/F and I am within normal specs..so it looks like I am getting bad readings on the dyno...so everything worked out, Techno says they are going to credit me the difference in ECU,so thanks for all the help.

 

I did a write-up a while back about tail-pipe vs. pre-cat A/F readings. The dyno I used was waaay off....even at idle. At idle, My AEM showed 14.7:1, the tailpipe reading showed 17:1 The gap was at least 1-2 A/F points off the entire way.