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R34 GTT on Haltech ECU No MAP Input

tsyk3s

By tsyk3s,
in Engines & Forced Induction

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kevboost7 Community Regular

kevboost7

Posted
Posted
On 12/11/2022 at 6:13 AM, joshuaho96 said:

It’s probably fine unless you actively tried to get it deep into boost and hold it just short of where it started misfiring. The danger is when you get deep into boost and it’s rich enough to ignite reliably but lean enough to get dangerously hot and knock-happy. If you just floored it and let it sit at the misfire limit you probably didn’t blow up your engine. The stock Haltech base map has even less timing than the stock ECU tune. 

That’s relieving to hear. I can sleep better at night now. 
 

what happened is that I was in the car with my buddy while he was on the computer. 
 

we were driving and he would change some setting and ask me to try it, then I would try to floor it but it wouldn’t go past 4000 rpm’s so I let off. 

 

we did that about 20 minutes, then I realized that he didn’t know what he was doing so we stopped 

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Kinkstaah Grand Master

Kinkstaah

Posted
Posted

I would say it's probably not fine at all. This is one of those things where when you open a laptop and notice your load source is at 0.0PSI and you know that is absolutely not possible with the engine running and idling that you go and find out why because anything else you do will not function.

If the car is still running, well, it's as damaged (or undamaged) as it can be. It all comes down to how close your ... 0PSI and (???) RPM load cell is tuned relative to the conditions the car was running in. Which is .... abysmal. Cars do not have a 1x1 load map. Who knows what the timing is set at 0psi and (???) rpm. Maybe the tacho is correct and it was going up and down in the 0psi table.

There's quite a lot of documentation on the Haltech end, I would advise reading it if not done already because tuning is fun. But you gotta make sure what the ECU is seeing is what is actually occurring in the motor or expensive metal sadness will result in short order.

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Duncan Grand Master

Duncan

Posted
Posted

I kind of disagree with that; if the car is currently idling fine then it is fine. You could do a compression test to check but most likely there will be no issue.

In practice, if you floor it with no load axis, you will go past the (very narrow) window where it might ping and straight into the engine can't fire at all (ie missfire). We often hit that narrow window when tuning because it is such a precise process and we are looking for the maximum timing the engine can take (in most cases), but when you are miles outside the window like this it just doesn't run at all

joshuaho96 Veteran

joshuaho96

Posted
Posted
1 hour ago, Kinkstaah said:

I would say it's probably not fine at all. This is one of those things where when you open a laptop and notice your load source is at 0.0PSI and you know that is absolutely not possible with the engine running and idling that you go and find out why because anything else you do will not function.

If the car is still running, well, it's as damaged (or undamaged) as it can be. It all comes down to how close your ... 0PSI and (???) RPM load cell is tuned relative to the conditions the car was running in. Which is .... abysmal. Cars do not have a 1x1 load map. Who knows what the timing is set at 0psi and (???) rpm. Maybe the tacho is correct and it was going up and down in the 0psi table.

There's quite a lot of documentation on the Haltech end, I would advise reading it if not done already because tuning is fun. But you gotta make sure what the ECU is seeing is what is actually occurring in the motor or expensive metal sadness will result in short order.

Pretty sure the base map is a weird one, one of the tables is TPS vs RPM only, another is MAP vs RPM only. I'd have to check to be sure but it's one of those things where even though a lot of bad things were done the holes in the system definitely maybe probably didn't all line up to cause a catastrophic failure. I would be nervous if this was a rotary engine though, those can die from a single knock event.

BK Grand Master

BK

Posted
Posted
4 minutes ago, joshuaho96 said:

Pretty sure the base map is a weird one, one of the tables is TPS vs RPM only, another is MAP vs RPM only. I'd have to check to be sure but it's one of those things where even though a lot of bad things were done the holes in the system definitely maybe probably didn't all line up to cause a catastrophic failure. I would be nervous if this was a rotary engine though, those can die from a single knock event.

Yeah fuel load is TPS and ignition load is MAP. Fuel load is generally changed to MAP when moving to a single throttle.

Ben C34 Grand Master

Ben C34

Posted
Posted

I find it incredible your mate who doesn't know shit from anything would just have a crack adjusting random things. Driving with no MAP line connected on an ecu that uses MAP as load source is insane.

I would slap him.

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