Hi,

For a while I have the following problem.

If I drive at higher speeds above 130 km/h at continue speed the boost is just below 1 bar.
At the moment the car doesn't acellerate the ECU stays in closed loop mode. @ lambda 1 14.5 AFR.
Because of this the Exhaust temp rises to 850 to 900 degrees celcius. A bit to high I think.

If I acellerate realy slow the boost falls in but it also runs in closedloop.

Is there a possibility to change the closed loop mode or disable it?

Otherwise It is possible to change the lambda value with my SMT-6 if necessary.

Or are there other options.

best regards Dennis

you could try to use an O2 clamp, on boost it sends a 0.4V(ish) lean signal down the Lambda line which stops the fuel trim, alternativly you can also put 5v down the TPS line which kicks the ECU out of closed loop

Edit: i use the TPS one on my MX-5 I use a seperate on boost timing and knock controller so when it sees boost @ or above 1psi it sends 4.57V down the tps signal line, kicking it out of closed loop

Good to hear that it's up and running, anyway!

BTW I meant just below 0 bar (underpressure)

As I read those thing maybe it's the best way to manipulate the lambda signal by putting it through my SMT-6 piggyback.
At the moment it runs near boost I need to change the lambda signal to lean.

Another question. Is there a way to get rid of the cold start?

give me a few days and will see what we can do.
Zak

TurboCinqy1250 said:

Another question. Is there a way to get rid of the cold start?

Click to expand...

warm up enrichment? if so why would you want that gone?
easy enough anyway. remove the connector for the coolant temp on the intake manifold and just replace it with a resistor that matches the coolant temperature at around 70C

I tried but that didn't work.
But I will try it again.

Why? If I give more than 10% throttle my AFR drops below 10. untill the engine becomes warm (70 degrees)

standard injector runs also at 2.2 bar fuel pressure and 3 bar full throttle

ahhh fair enough. the one in the head just does your temp gauge. look for a blue plug at the back of the engine. if you want ill find out the exact resistor you need for 70 degrees (i have the sensor documents on my laptop)

Huh?

I'd made a mistake this morning in my reply but did edit the message within a few minutes. Why are you able to read the old un edit message .

It's a while ago so that why I said the one in the head, but after a few minutes I thought o no it was the flat blue connector at the back of the intake manifold.

Maybe I used the wrong values. I thought it was a high resistance.

I'll check it again.

Thankx.

lol i get email notifications to i read your reply on that. never noticed your edit.

well that sensor is what controls warm up so defiantly what you need to fit the resistor there (if thats not doing what you hope the problem must be elsewhere)

the resistor you need is for:
70 = 0.53K (530ohm)
80 = 0.38K (380ohm)
90 = 0.28K (280ohm)
anything between 70 and 90 should do the trick


edit* wrong values

Thanks.

Just plug it into the connector right?

yup.

not forgot yet, trying to get the AFR to 13.2,
might be able to lessen the warm up enrichment,
what oct fuel are you using?
Zak

slosei said:

not forgot yet, trying to get the afr to 13.2,
might be able to lessen the warm up enrichment,
what oct fuel are you using?
Zak

Click to expand...

98.