My 89 Camaro Project

[3400-95-Modified]

durr... good point...

but is what I stated true for GM ECM's?

I still find it odd that the Holley unit relies on a narrow band for a WOT fueling though since they are so inaccurate.

[bszopi]

Dave recently installed a Holley Commander 950 in place of his stock ECM, so it may act differently at WOT.

Brad via Tapatalk

[3400-95-Modified]

correct me if I'm wrong, but isn't the o2 sensor disregarded at WOT and it simply uses the VE and IFR tables to calculate how much fuel to deliver? Thats what I've been told before when tuning my car, and always find that to correct the error between the Commanded AFR and the Wideband reading I need to re-scale that part of my MAF table, granted for you it would be the VE table since your not a MAF user.

[TGP37]

Well put it this way, it is an easy fix wrapped up with a lesson learned. I bought a new NBO2 last year and the darn thing is dead. Reads stoichiometric constantly and that is no good. So I'm stuck in OL w/ the wideband and was tempted to use the narrowband sim output. But running open loop has its advantages, I just wish I had the back up stoich confirmation while tuning. I feel comfortable with the fueling accuracy when both N&W agree on stoich.

I'm considering MS3.....

[Superdave]

Pic..




Datalog... you can see how a bad wideband o2 can really piss off the ecm.. lol

http://www.sdsgarage.com/Misc/Camaro/Track/Track%20Datalog-BadWBo2.xls

Moral of the story, never use it as your primary o2. Always add a 2nd bung and run a standard sensor for the ECM.

[2.8/3400 1985 Camaro]

I know, but for your first pass on that motor, and with issues, its not that bad.

[Superdave]

14's are like a kick in the nuts.. it should be low 13's or high 12's


Sad thing is that it's probably the fastest N/A 60v6 Fbody right now..

[2.8/3400 1985 Camaro]

Idk, 14s on an all motor 60 in an fbod is still pretty good. I'm sure it will come up with fine-tuning the kinks out.

My corsica's o2 is wonking out since I seafoamed it, so I can sympathize on incorrect o2 readings, keeps leaning the car way the hell out on the highway, hopefully shipping on the replacement is expedient. I have it disconnected atm, which keeps things running decent till the ECU figures it out and throws the code. So I have to hook up a tech II ~every other day atm =/

[Superdave]

Well, i shook it down pretty well at the track today and found quite a few bugs.

The worst is that my wideband fowled out and since i use the NB sim to feed my ECM it was getting a lean signal and running way rich. I was trapping at best 98, should be around 110.

My 700R4 was also acting up which is no surprise.


I do have datalogs, videos and a picture, i'll post them when i can.

Best run of the day was a 14.1 @ 96 IIRC.. had a 1.9 60' on street tires which was cool i guess. Pretty disappointed but it was the first time it's seen the track.


There is a lot more in this thing, not sure when i'll get back to the track but hopefully soon.

[Alxsmt]

nice! Im glad im not the only one sick of tuner pro lol. hopefully it works out better

[Superdave]

It starts and runs on the new ECU!

I'm going to build a new wiring harness for the engine this weekend and then get to tuning. The 950 setup is cake, i only had 1 small problem and it was fixed in 5 minutes.


I will say again that the 950 tuning software is very dated, and it takes surprisingly long to download a file to the ECU (around 2 minutes). Still pretty cool though.

[Superdave]

With this i can give better resolution to the top side of the VE table since that's where it spends most of it's time... hopefully i won't have to run alpha-n but if so it's as easy as can be with this setup.


$A1 just can't handle the quick MAP changes, AE is a constant battle.

I should take it out and make a video just so you guys can get an idea of what it's like to drive around the city and on the highway.

[SappySE107]

A1 is completely decoded for data but it really isn't meant for alpha-n tuning, and that is what ITB setups run best on from what I have read.

[3400-95-Modified]

I think its a wise decision going with the standalone since you will now have access and control of every aspect since I'm sure there are still things buried in the $A1 code that haven't been mapped yet that have some affect on how the engine runs.

[bszopi]

I'm still on the fence as far as what ECM I will use in the Mustang. I know I will be going with a FAST unit for the transmission, but thought it might be interesting trying to go with a GM ECM for the engine. Depending on how yours turns out, I might be leaning back to the standalone side of controls...