How can make a chip for 14cux

[haaren]

Hi,
During my trouble shooting with my '95 chimaera 400 I've seen my ecu is running a wrong file.
It seems the ECU has been replaced in the past, unfortunately with the wrong tune.
In rovergauge it's shown tune 2422 (pre cat) while mine should be at least 2967 (cat), this could be the cause of why I do not have a target idle and hopefully also has something to do with the rough idle & high emissons
I'm in contact with Frank but his burner is not working for the moment.
If there are upgraded tunes possible, like higher rpm or adjusted to my cam (piper 285), cat delete + shorten trumpets that would be even better of course (still need to be in mot range).
Please let me know who could help me.
Pictures of the ECU and chip





Thank you

[Belle427]

The Ecu shown is labelled as 4.0 Cat from what I can see, any idea where it came from?
Is it possible someone has changed the tune resistor in your car?

[haaren]

Could be someone has swapped the chip or complete ecu, I can not find anything in the histo.
It's running on fuel map 5 according to rg, so the correct tune resistor is installed.
However in rg I also can read tune 2422 which is fault, this appeared to me because it doesn't activate target idle (green light) or show the target rpm. When searching on pH I found some others who had same issue and could only be solved by changing chip to correct newer tune, please correct me if I'm wrong.

Edited by haaren on Saturday 16th August 09:45

[Belle427]

I would ask the guys on this thread just to confirm.
https://www.pistonheads.com/gassing/topic.asp?h=0&...

[davep]

Unfortunately you have a Land Rover 3.9 CAT Prom chip, Tune Ident 1A07, in your car's ECU. Your TVR would greatly benefit from having TVR Chimaera 400 CAT prom, Tune ident 1A17, installed. The fuelling map will change for the better, RPM limit range will be extended to 5800 rpm and base idle will be increased to 850 rpm. Your current issues should be resolved with the correct chip in place.

The link above and SteveSprint's website provide all the information needed to install the correct chip or upgrade as required:

http://www.remap-14cux.uk/bins/

Good luck.

Edited by davep on Saturday 16th August 13:04

[haaren]

Belle427 said:

I would ask the guys on this thread just to confirm.
https://www.pistonheads.com/gassing/topic.asp?h=0&...

Done, thank you for pointing out

[haaren]

davep said:

Unfortunately you have a Land Rover 3.9 CAT Prom chip, Tune Ident 1A07, in your car's ECU. Your TVR would greatly benefit from having TVR Chimaera 400 CAT prom, Tune ident 1A17, installed. The fuelling map will change for the better, RPM limit range will be extended to 5800 rpm and base idle will be increased to 850 rpm. Your current issues should be resolved with the correct chip in place.

The link above and SteveSprint's website provide all the information needed to install the correct chip or upgrade as required:

http://www.remap-14cux.uk/bins/

Good luck.

Edited by davep on Saturday 16th August 13:04

Hi Dave, thank you for confirming.
It's even a range Rover tune.... Let's hope I find someone who can make a chip an solve some riddles

[ChazUwe]

haaren said:

Hi Dave, thank you for confirming.
It's even a range Rover tune.... Let's hope I find someone who can make a chip an solve some riddles

Might be worth asking on Facebook groups aswell.

Also I think Blaze_away could help you. Potentially with the chip , but definitely have a look at and review some RG log files. He is really helpful

[haaren]

I do not have Facebook and want to keep it like that, so I need to find an alternative way
Blaze already helped me a lot with analysis of the data, unfortunately his chip burner is broken.

[CGCobra]

I've been replying to you on the main re-mapping post, probably best to keep replies specific to your query here now.

As I've mentioned there I'd be more than happy to create a chip or two for you (looks like you are in the Netherlands which shouldn't present a problem) if you point me to the exact one(s) you are looking for, ideally on Steve Sprint's site.

You should be able to send me e-mails now. Let me know if not.


Looking at your RG screen some things seem a bit odd, possibly due to your chip or maybe due to something physical not being correct.

You are not getting idle mode. I'd put this down possibly to your Throttle Possition being at 4%, although this may not be the case if you checked 'Corrected'. Could be due to your throttle being slightly pressed but then I'd expect your RPM to be higher.

I've spent quite a lot of time on the code but only in the later (3652 IIRC) version. In this it seems to constantly monitor the TPS output and treat the lowest reading found as the closed position which means the TPS position has a bit more tolerance, and possibly allows the value to be corrected if you start the car with throttle depressed. I believe early code versions required the TPS output to be a much more exact value for the ECU to understand zero.


The trim values seem high possibly due to not running an appropriate map. Hopefully this will improve when you get a better map.

I tend to look at MAF with the 'Linear' setting checked, it reduces the non-linear nature of the sensor.

Based on what I've been looking at recently your Idle Bypass Position seems a bit low although my logic is that lower is better than higher (may not be right though!).

Edited by CGCobra on Tuesday 19th August 20:35

[haaren]

CGCobra said:

I've been replying to you on the main re-mapping post, probably best to keep replies specific to your query here now.

As I've mentioned there I'd be more than happy to create a chip or two for you (looks like you are in the Netherlands which shouldn't present a problem) if you point me to the exact one(s) you are looking for, ideally on Steve Sprint's site.

You should be able to send me e-mails now. Let me know if not.


Looking at your RG screen some things seem a bit odd, possibly due to your chip or maybe due to something physical not being correct.

You are not getting idle mode. I'd put this down possibly to your Throttle Possition being at 4%, although this may not be the case if you checked 'Corrected'. Could be due to your throttle being slightly pressed but then I'd expect your RPM to be higher.

I've spent quite a lot of time on the code but only in the later (3652 IIRC) version. In this it seems to constantly monitor the TPS output and treat the lowest reading found as the closed position which means the TPS position has a bit more tolerance, and possibly allows the value to be corrected if you start the car with throttle depressed. I believe early code versions required the TPS output to be a much more exact value for the ECU to understand zero.


The trim values seem high possibly due to not running an appropriate map. Hopefully this will improve when you get a better map.

I tend to look at MAF with the 'Linear' setting checked, it reduces the non-linear nature of the sensor.

Based on what I've been looking at recently your Idle Bypass Position seems a bit low although my logic is that lower is better than higher (may not be right though!).

Edited by CGCobra on Tuesday 19th August 20:35

I've send you an mail with more details, if not received let me know.


If I remember it correct then the corrected tps value was 0, to be sure I will test it tomorrow.
Normal you should have target idle or co voltage, non are shown in my rg. I turned the co screw and it did react to it by hearing, I need to go to garage if it also reacts on emissions, that would be great if I can get it below 0,5....
The settings in rg are done as frank / blaze likes it, from there I'm trying to understand all what I see and happen. I do have some experience with working on cars (many many years ago I started as a mechanic), however the tvr is more complicated/ my issues are more complicated. Everything I check is sort of ok or not likely the cause to let it run like it is now.

If you want to see some different data from rg with other settings, please let me know and will do a run tomorrow. There are some small things I want to do/check, if these still be ok I'm getting out of Ideas.
I want to thank everybody for your help, I really appreciate all tvr members who share the information they have to help others

Edited by haaren on Tuesday 19th August 22:19

[CGCobra]

haaren said:

I've send you an mail with more details, if not received let me know.

I had a mail from you this morning and sent the reply below to acknowledge. I’ve now got back home to pick up the files and burn the chips but I can’t find your original mail, seems like it’s automatically been deleted once I replied.

I've sent you a mail to explaing this, could you reply to that mail with the file details you require and I’ll get on with it as soon as I can. Hopefully mails directly between us won't get deleted!

[haaren]

Thank you for all your help, looking forward to see what will happen with the correct file.

Just tested rg with other settings:

Maf 0 and tps 0, with cold start stepper is 30% but will slowly go back to 4-5% when hot.
Strangely if you make more rpm, the maf keeps 0.
Is it normal that maf will remain on 0 when selection is on linear?

Putting selection back to direct will give direct a normal reading:


Strangely also my mill light in rg was on, checking on faults but there where non. Disconnected and connecting again would remain light on and no error code. Switching engine off, disconnect, start engine and connect, the mill light was off again??
No idea what that was.
Let me know if you have any thoughts about above data/info, thank you.

[CGCobra]

Hear are some observations I made before I read your notes. Not necessarily issues as I don't know exactly what was happening with the engine at the time.

Pic 1
MAF and TPS both zero, maybe TPS is correct but MAF should have a reading. Set to linear.
Is that MIL light on?
Pulse width seems a little long at 3.36mS although engine not up to temp.
Gear select shows it's an auto box, I'm assuming that's not the case? Shouldn't be a problem though, just your idle may be a little low.

Pic 2
Up to temp.
Obviously a throttle 'blipped'
Trim looks a little high but I'm not too au-fait with this as mine is open loop so may be right.
Injector duty cycle looks quite low, could just be the transien condition.
Still no MAF showing
MIL light still looks on. Can you check if any codes showing?


Pic 3
Temperature dropped a bit.
MAF now reading - Set to direct.
TPS reading above zero even though RPM looks like idling - Did you have any throttle in effect? Set to absolute could be reason.


Pic 4
Obviously a bit of a throttle blip in effect here. RPM elevated and TPS showing reading on absolute
MAF is reading, set to Direct - Do you ever get a reading with setting on Linear.
MIL light appears off now.
Do you have the "MAF CO trim" checked under Options>Edit Settings?


I see you're on v11.3, I'm on v11.2, didn't know there was a later release, I'll have to check into that.

haaren said:

Thank you for all your help, looking forward to see what will happen with the correct file.

Just tested rg with other settings:

Maf 0 and tps 0, with cold start stepper is 30% but will slowly go back to 4-5% when hot.
Strangely if you make more rpm, the maf keeps 0.
Is it normal that maf will remain on 0 when selection is on linear?

Putting selection back to direct will give direct a normal reading:

The MAF reading is the main thing which stood out to me. I don't think you should have a reading of zero on the linear although when you set it to Direct you seem to get a reading so it seems the issue may be in Rovergauge or the comm's. I'm farily sure this is not the case on mine, possibly someghing to do with the earlier program code on the PROM which the new chip should address.
TPS corrected should be at zero with the throttle closed so that would seem to be OK.

haaren said:

Strangely also my mill light in rg was on, checking on faults but there where non. Disconnected and connecting again would remain light on and no error code. Switching engine off, disconnect, start engine and connect, the mill light was off again??
No idea what that was.
Let me know if you have any thoughts about above data/info, thank you.

The MIL was another thing I noted, seems like it could be an issue with connecting before engine start.

[Belle427]

Some guideline healthy readings to expect in my limited experience are:

Maf direct 32%
Throttle position between 2% and 10%
Idle byass between 30% to 40%
Lambdas ideally cycling around the mid point plus or minus %10 ideal.

[Belle427]

[davep]

haaren said:

Thank you for all your help, looking forward to see what will happen with the correct file.

Just tested rg with other settings:

Maf 0 and tps 0, with cold start stepper is 30% but will slowly go back to 4-5% when hot.
Strangely if you make more rpm, the maf keeps 0.
Is it normal that maf will remain on 0 when selection is on linear?

Putting selection back to direct will give direct a normal reading:


Strangely also my mill light in rg was on, checking on faults but there where non. Disconnected and connecting again would remain light on and no error code. Switching engine off, disconnect, start engine and connect, the mill light was off again??
No idea what that was.
Let me know if you have any thoughts about above data/info, thank you.

Your RG sessions are showing spurious results: MIL Lamp On but no fault codes, Fuel Map values that glitch between R2422 Map 5 and Map 2 (RPM Limit especially), and so on. It is almost as if the ECU doesn't quite know what tune to use. From the table below it could be you have a TVR 400 Precat & 250 bhp tune but running on Map 5 (sometimes), not good, the TVR tune was programmed for use with Map 2 only,

Get the chip changed and check your tune resistor and its circuit.

http://www.remap-14cux.uk/LR-TVR-settings.html

[CGCobra]

davep said:

Your RG sessions are showing spurious results: MIL Lamp On but no fault codes, Fuel Map values that glitch between R2422 Map 5 and Map 2 (RPM Limit especially), and so on. It is almost as if the ECU doesn't quite know what tune to use.

I understand what you mean by the MIL lamp issue but I'm not seeing any change of map number, all the graphics I've seen are Map #5. Did I miss something?

I'm fairly certain that the change in RPM limit depends on the conditions in effect when RG connects. If the engine is running the limit will be as set in the map data, connection made before engine start will result in the default limit. This caught me out a while ago!

davep said:

From the table below it could be you have a TVR 400 Precat & 250 bhp tune but running on Map 5 (sometimes), not good, the TVR tune was programmed for use with Map 2 only,

That's worrying, surely Map 2 is open loop only hence precat only, maybe I've misunderstood the specific tune you're talking about.

[davep]

CGCobra said:

I understand what you mean by the MIL lamp issue but I'm not seeing any change of map number, all the graphics I've seen are Map #5. Did I miss something?

The RPM Limit value changes from 5403 (Map 5) to 6250 (Map 2) when haren makes changes to the screen options. Since the RPM Limit value is held in External Memory, which is reinitialized during every spark interrupt with the value held in the respective Map data section, the ECU and Rover Gauge are processing and reading values from Map 5 and Map 2 for reasons that escape me.

CGCobra said:

I'm fairly certain that the change in RPM limit depends on the conditions in effect when RG connects. If the engine is running the limit will be as set in the map data, connection made before engine start will result in the default limit. This caught me out a while ago!

If by default you mean Map 0 (aka Limp Home Map], there is no defined data location for a RPM Limit in that map. The RPM Limit is tune specific so only appears in each of the five other maps.

Map 2 is indeed for open loop fuel management. The chip in haren's ECU must have a Map 2 tuned for TVR 400 Precat & 250 bhp, because the 6250 rpm value is unique to that tune. Given that the dates on the ECU case and PROM indicate this is a very early car, it could be that it started life as a non-CAT (TVR may have built a few 'precat' Chimaeras in 1992/3). Upon arriving in Holland the new owner changed the tune resistor to Map 5 for emissions reasons not realizing that the car would now run as a Land Rover 3.9 CAT.

Edited by davep on Thursday 21st August 12:54

[CGCobra]

Belle427 said:

Some guideline healthy readings to expect in my limited experience are:

Maf direct 32%
Throttle position between 2% and 10%
Idle byass between 30% to 40%
Lambdas ideally cycling around the mid point plus or minus %10 ideal.

Good information. Do you know what sort of values you see for MAF Linear?