(Help) Take a look at my ECU MAP's for 4AGTE?

[dave_101]

Hey Everyone,

Just wondering if some of you would mind taking a look at the MAP's currently running on my 4AGTE running stinger ECU. Pretty sure the mechanic that was working on it played around with the MAP's and something is not right, when the turbo spools up fully the power kind of flattens out and I get what looks like un-burnt fuel coming out the exhaust, think something is either wrong with the fuel or ignition MAP's.

Below is a link to my saved ECU settings file, you would need to install the Stinger v3 software and you can load up the file and take a look MAP's.

My ECU File

Stinger ECU Software v3

Would mean a lot if any of you that know about this stuff could take a look and see if you spot anything strange or really stuffed up in either the Ignition or Fuel MAP's.

The turbo is currently set to 13psi.

Thanks in advance.

Dave

[schnickles]

How accurate is the boost guage? Maybe try having the laptop plugged in and go by the gauge in the software, the reason i suggest this is i see your boost cut is 111kpa which is around 14 - 15 psi ( i think ) so ur running pretty close to boost cut it wouldnt take too much to activate it.

Or if you cant do that maybe take 1 - 2 psi of boost out of it and see if it still does the same thing.

[dave_101]

How accurate is the boost guage? Maybe try having the laptop plugged in and go by the gauge in the software, the reason i suggest this is i see your boost cut is 111kpa which is around 14 - 15 psi ( i think ) so ur running pretty close to boost cut it wouldnt take too much to activate it.

Or if you cant do that maybe take 1 - 2 psi of boost out of it and see if it still does the same thing.

Thanks for the quick reply man.

Yeah I have played around with the boost cut, when I got it back in the ECU the boost cut was set to like 11.25psi and the turbo was running 14psi, so I have felt the boost cut before, changed it in the ECU so that it's not cutting anymore.

The problem I am getting I think has something to do with either the fuel or ignition MAP's, it wasn't dropping power like this before I took it in and think they have stuffed around with the MAP's, they def changed the boost cut as I had to fix it when it came home. Why in gods name they would give it back to me running 14psi on the turbo and boost cut in the ECU just over 11psi is beyond me, which makes me think they also stuffed up the MAP's.

I was out today pulling some boost out, took it down to about 12psi and the problem was still there.

[JP]

why not ask the mechanic what they did to it?

What did it actually go in for?

[schnickles]

What was the original reason it was at the mechanics? seems strange they would change the boost cut and not give you a reason for it

At a quick look nothing in the maps really jumps out as an obvious reason to me - maybe someone else can see somthing i dont?

[dave_101]

why not ask the mechanic what they did to it?

What did it actually go in for?

Not sure how to put this, I would not take it back to this mechanic if he was the last one on earth, might give you the jist of what went down. I got given a car back in a worse state in some ways than when it went in.

It went in a for a lot of stuff to get her road worthy, one of the big jobs was it was totally re-wired using an EMS loom, they said they fixed some of the fuk up's in the MAP, so in other words played around with lots of stuff.

What was the original reason it was at the mechanics? seems strange they would change the boost cut and not give you a reason for it

At a quick look nothing in the maps really jumps out as an obvious reason to me - maybe someone else can see somthing i dont?

Thanks for taking a look man.

Something just dawned on me, since they re-wired the car the takko has not been working correctly, when the boost comes on in 2nd or 3rd as it ramps up the takko actually goes down instead of up, before I just thought it's another part of their dodgyness and didn't worry too much, but if the ECU is seeing the same thing I am on the dash then that would explain what’s going on, it would be reverting to the sections of the MAP for lower RPM with retarded timing.

I am no mechanic and really don't understand the ECU's very well, but is my line of thinking on the right track here?

How does the ECU sense RPM and is that related to what I see on the takko on the dash?

[JP]

sounds like they've stuffed up the triggers, usually comes from the CAS unless it's got a hall effect trigger on the crank wheel etc.

So at idle, what RPM does the ECU show? If they've got the reluctor wires switched around with the wrong polarity you will see weird things with the RPM signal.

[schnickles]

Agree with JP ive seen reversed polarity on pick ups cause huge fluctuations, id be carefull boosting it round too if it is dropping back to a lower number in the fuel map its a high risk of lean out, maybe take it to a dyno shop where it can be analysed safely

[dave_101]

sounds like they've stuffed up the triggers, usually comes from the CAS unless it's got a hall effect trigger on the crank wheel etc.

So at idle, what RPM does the ECU show? If they've got the reluctor wires switched around with the wrong polarity you will see weird things with the RPM signal.

From memory at idle the RPM on the ECU shows as normal, but I really need to hook up the lappy tomorrow and take a look. The gauge in the car seems to work fine until the boost comes on and then starts going backwards, funnily enough that's the same time that the power seems to go and a shitload of unburnt fuel comes out the exhaust.

You will have to excuse me here, what's a CAS?

I know they changed the main crank pulley from the GZE one that was on it to a NA one, that should not have anything to do with it hey?

Agree with JP ive seen reversed polarity on pick ups cause huge fluctuations, id be carefull boosting it round too if it is dropping back to a lower number in the fuel map its a high risk of lean out, maybe take it to a dyno shop where it can be analysed safely

Yeah I have not been driving it really at all, about 4klm about two times now just trying to diagnose. There is a shitload of un-burnt fuel coming out the back when it does bog down under boost, so hopefully it's not leaning out. Strange because if it was reverting to a lower RPM section of the MAP you would think it would be leaning out, with saying that though and having a think about it now it really does feel like it's pulling the timing back.

There is two parts to how this ECU works out what to do hey, first is from the pressure in the manifold and second would be from the RPM hey?

Yeah I think I need someone to take a look, I have a mate that is an electrician and does a lot of work with GZE's of his own, he might be able to work out wtf these guys have done. So nothing worse than getting a car back from a place and have them totally root it up.

[schnickles]

Hmmm interesting problem keep us posted as to what you find im keen to know what it is now

Yeah normally just map sensor and rpm - some people use tps also especially if it has big cams cos theres not a stable vacuum at idle

[dave_101]

Hmmm interesting problem keep us posted as to what you find im keen to know what it is now

Yeah normally just map sensor and rpm - some people use tps also especially if it has big cams cos theres not a stable vacuum at idle

Will do man, I am going to hook up a lappy to it tomorrow and go for a drive around the block and have my mate watch the RPM gauge on the lappy and see if it does the same shit as the dash, if it does I think we have found the problem.

Cool, it's only running MAP, TPS has not been hooked up yet and was only tuned for MAP. God I hope this is what the problem is.

Anyone else have any input before tomorrow's test I would love to hear.

[JP]

TPS should really be hooked up for acceration enrichment etc. The CAS is the Crank Angle Sensor, mounted where the distributor usually is on MAP 4agze's, if your car has an AW11 GZE then it may still have the distributor. If it still has the dizzy then that's most likely where the RPM signal is being fed from.

[dave_101]

TPS should really be hooked up for acceration enrichment etc. The CAS is the Crank Angle Sensor, mounted where the distributor usually is on MAP 4agze's, if your car has an AW11 GZE then it may still have the distributor. If it still has the dizzy then that's most likely where the RPM signal is being fed from.

Yeah the original owner never had TPS and these guys were meant to hook it up for me but got lazy and didn't do it before they gave it back to me. All I need is a plug and I can hook it up.

It's an AE101 GZE, so it's the MAP model with coil packs and CAS.

So we should be looking for wires coming from the CAS that may be hooked up the wrong way around?

[thechuckster]

Also, get laptop out and do some data logging (can you do that with v3 Stinger) - and a wideband AFR sensor/controller/gauge would help.

[dave_101]

Also, get laptop out and do some data logging (can you do that with v3 Stinger) - and a wideband AFR sensor/controller/gauge would help.

I think the stinger needs another part to be able to do data logging.

Yeah it's got an LC1 in there, but once again thanks to this bloody mechanic he disconnected it and I don't know how to re-connect it.