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Post by babaracus on Jun 19, 2007 11:54:45 GMT
So far I am very happy with how my car is running, however I am a little concerned that the mapping on the exisitng ECU is going to be a bit involved and I don't wish to wait months to sort it.
Its going to go to Red Dot (hopefully next week) for a remap, then I will see where that leaves us. My concern is that the cam sensor is throwing the ECU out as when the fault does not log it pulls like mad, then when it has logged it goes back into hesitation street!
If mapping is unsuccessful there are a few options left :
Get a 16v ECU from mark one wired in.
Relocate cam sensor and get it working as it should on present ECU and map again.
Custom ECU.
Price is not really the issue as I just want the thing running 100%, so what would you guys do??
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Post by lowtechguy on Jun 19, 2007 13:21:48 GMT
If the cam sensor can be mapped out then that would be the best option as the ecu you have is the best one in terms of sofistication.
Other ECU's like the mk1 16v are getting old and if you have problems you are harder to find a replacement. But it doesnt have a cam sensor so you dont have to worry about it.
Aftermarket ecu is best but is the most expensive.
But if the sensor cannot be mapped out then some electronic wizardry can take place. e.g The crank is turning double teeth on the belt as the cam pulley on the 8v - get peter to confirm if it is also on the 16v. So you could get some sort of relay delaying the signal.
Or
Relocate the sensor, or find out which mk2 punto 8vs didnt have a cam sensor (some didnt I think the early ones) and use a virgin map for them.
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Post by hudsonhenry on Jun 20, 2007 11:03:11 GMT
A good custom ECU like an Omex will give you the best set up now and cover any possible mods in the future. Plus it will give you maximum flexability in resect of rolling road/mapping supplier.
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Post by kritip on Jul 12, 2007 13:07:20 GMT
I also get the cam error, due to the trigger pattern being totally dirrernt on the cam, to the am pulley of the 1008cc engine. You could move the sensor and create a new trigger ring. I don't have power loss when the light come on though, when the error light comes on, it's actually reading multiple cylinder random misfire, and NOT cam error. the cam error is trigger almost immediately, but doesn't seem to trigger the MIL. I'm sure that the cam sensor is causing the misfire error in a roundabout way though. Which ECU do you have? There are two varient on the mpi, the larger one that I have and the much smaller one. THe smaller one, seems a lot easier to have mapped etc. I couldn't use KWP2000 on the larger ECU. I am still runnign the 1.1 8v ECU on the 16V and although it seems a bit rich, it pulls and goes VERY well. 5K later and its not destroyed itself! Make sure you disable the secondary lambda though, else you will always be going into limp mode. I did this by removing it from the exhaust, and sealing it in tin foill.....works a treat. I am now building a MS from scratch though, that I will run the car from very soon in the future  Kristian Now |
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Post by lowtechguy on Jul 12, 2007 14:59:55 GMT
I'm confused, when I removed my second lambda I went into fixed mode and lost around 15bhp.
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Post by oldschool on Jul 13, 2007 13:06:18 GMT
Which ECU do you have? There are two varient on the mpi, the larger one that I have and the much smaller one. THe smaller one, seems a lot easier to have mapped etc. I couldn't use KWP2000 on the larger ECU. Make sure you disable the secondary lambda though, else you will always be going into limp mode. I did this by removing it from the exhaust, and sealing it in tin foill.....works a treat. There is quite a few more variants than 2 on the Seicento MPI ECU. The all have the same setting file. Disconnecting or taking out of the post lambda sensor is not an idea any serious tuner would advise of. |
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Post by kritip on Jul 13, 2007 17:18:48 GMT
Yeah, I should have been more clear. As I have no CAT, I couldn't retain the second lamdba, but I couldn't disconnect it due to the post above. My solution was to take it out of the exhaust and stop ANY gasses, even air, getting to the element. This fools the ECU into thinking there is a working CAT fitted.
I am not a serious tuner, its a project I've done all by myself, my ECU hasn't even been mapped!! But that seemed the only solution that I could see for my situation.
What would you have done? Can you disable it in the firmware?
Kristian
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Post by oldschool on Jul 14, 2007 14:01:43 GMT
I wouldn't advise you to try to disable it in the software. A properly designed sports cat will set you back about £120 + getting some flanges and a bit of pipe welded to it.
If you go down this route you will fairly easily be able to extract more power and you haven't got to mess with MOTs.
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Post by babaracus on Jul 16, 2007 3:03:59 GMT
Hi I'm live from the Bahamas tonight! But thought I would add some input into this one.
As soon as I get back (or there abouts) We'll sort the new marelli ecu and remap. (Mine is the smaller type one).
My car has always behaved very odd with this ECU and now has a misfire all the time at certain revs. Im inclined to beleive that it has had this for a while hence the inconsistent running but has now become full time, not just present under acceleration/load.
For those of you who don't now my car seems to pull like lightning one minute and then be sluggish (especially when its been driven for a distance).
If I do not get some results in the next month or so it pains me but I have been offered a megasquirt ecu with wideband lambda for half retail price built from scratch which is coming in less than a new + remapped fiat ECU.
I must emphasise that this is not the route I wish to take but if results are not achieved from the new marelli ECU that is how it is going end of story. I just want the thing running quickly and consistently on a daily basis. I'm hoping the marelli ecu + map will sort it but its fingers crossed until its been in.
I've already spent 450 on mapping this engine and has been a fruitless experience. So with the new ecu and red dot map is the last resort otherwise its getting silly. Otherwise MS will be tried.
On the note of the exhaust I am very happy with the result of the exhuast system sorted by Peter and Clovertech which definately provides more push than the old system. The sports cat seems to be working nicely and the fron pipe bore is a very impressive size (I measured it around 2.5" going down to 2' in the centre pipe and around 1.8' backbox.)
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