Bigretardhead

okay, I had a thread about this a while back, but it was getting kinda cluttered so I thought I'd make a new one.

anyway, i'm running a haltech E8 on my FC.

I'm having this problem, where, it seems like usually when its cold, the engine won't rev about 1500rpm. it just sits there and misfires, and sometimes backfires, but it won't rev. its like a rev limiter, and its completely independent of throttle position(except the sound of the backfire changes). however, it occasionally will rev when its cold, and also, sometimes it won't rev when it is warm.

also, usually when its warm, it will rev, but it hesitates and misfires a little at 1500rpm. it runs great above that, and below that though.

one thing I just noticed though... the last time it was really bad and wouldn't rev at all even when the engine was warm, is a day when it was a little cold, and rainy outside. now today, its doing it really badly again (won't rev at all) and its cold and rainy again... although it doesn't seem like this should really make a difference once the engine warms up...


now, I've done a lot of datalogging, and adjusting of injection time, and ignition advance, but I can't figure anything out. it doesn't seem like there's any problems...

here's a data log.
I really hope there's something obviously wrong that I'm not seeing... I don't have a whole lot of experience with any sort of standalone system previous to this...

I would really appreciate any help.

thanks.

Bigretardhead

okay, so this is wierd...
I loaded an old base map in to the haltech, and it revved great as soon as I started it(well, it ran kinda poorly cuz the tuning was bad, but no wierd rev limiter thing). loaded the current map, and still won't rev.

so I looked at the differences in the two for hours and I couldn't really find anything that would make it not rev... there were no real differences... just like a couple degrees of timing here and there, and a couple tenths of ms of injector time... nothing that would cause any serious problems... finally, I found the only thing I could find that was different... the pre-gain filter, and the gain control were different. set at 1(pre-gain) and 5 (gain) on my current setup(I think), and 2 and 2 on the base map.... now I also noticed that the base map ran really really poorly at low rpm...

well, anyway, I adjusted the pre-gain filter for 2 instead of 1, and suddenly it starts to work... I'm hoping it wasn't just coincidence that it started to work suddenly when I did that... I guess we'll see tomorrow. but I'm confused as to why it would sometimes work, and sometimes not, just because the pre-gain filter was slightly too low? the only thing I tied together with not working or working is, cold(sometimes) and humidity, as the only 3 days its rained since, it worked worse than any other day... doesn't make sense to me...

RX7.0

Why is your MAP signal changing so little when you open your throttle?
Altitude? N/A or Turbo?

Claudio RX-7

iTrader: (1)

Yeah, that is a wierd datalog... is the car at idle, or are you reving it?

Bigretardhead

altitude(5500 ft.) barometric is -2.2psi, so anything above that reading on the haltech is boost.

the first one I am 'trying' to rev it. its showing 82% throttle, but it won't go above 1500rpm. you can see the TPS readings running all over the place but the rpm never goes above 1500rpm. I think the graph looks so wierd because its basically just mis-firing there when its not at idle.

the second one is at idle, although it was idleing a little high right there.

Bigretardhead

oh, but I guess the filter adjust was the problem... as soon as I started it up yesterday, it had no problem revving...

I just don't understand how it ran fine above the rpm (when it would go there), and idled fine, if the cas signals weren't filtered well? and that sometimes it worked and sometimes not? could it have something to do with moisture affecting the signal pickup or something? sounds pretty uh..... weak. lol. but I have no idea what else could be the reason...

RX7.0

I would imagine that it would run fine above that RPM for the same reason a car with a "miss" will still run. It can handle the missed spark and continue running.

Also, with variable reluctance sensors (e.g. your CAS) the amplitude of the signal increases a bit with higher frequency, so less gain would be needed and it would have a good signal. I think this is also why it is good practice to ONLY use the amount of gain you NEED.

Finally, the cold may have been affecting you simply due to a lack of coolant temp compensation. (you need to run fairly rich while it's cold)

Bigretardhead

I was just confused as to why it would sometimes work, even when cold, and sometimes not... and the temp correction maps have nothing to do with it not revving... I could adjust them to wherever, or even turn them off and if wouldn't change the 1500rpm thing. and even when the engine was completely warm, it still wouldn't rev sometimes...

well, that part seems to be working now, although there's still a little hesitation around 1500rpm... so I dunno.... its wierd...