Problems with RPM limit

Give input on tuning as well as any tips and tricks you may have. Also feel free to share base mapping files for various engine types.
J.W.Woermeijer
Posts: 11
Joined: Mon Aug 19, 2013 10:23 am
ECU Model: S40 Pro
Location: Raalte | Holland
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Problems with RPM limit

Post by J.W.Woermeijer »

Hello.

Since some time I use a DTA S40 for my 2.3 liter 16V Volvo engine.
I'm still setting everything, but now I run into a problem.
The rev limiter intervenes at 5500rpm.
but he is at General engine settings set to 7500TPM.
(it is possible to do 8500TPM with these engineconfiguration)

My trigger wheel is a 60-2 wheel on the crankshaft.
The sensor is the original sensor on the flywheel side
Could it be that my sensor is not fast enough?
This is my trigger wheel:

http://shop.klracing.se/sv/artiklar/mot ... -60-2.html

Sincerely,

Jan-Willem Woermeijer
Attachments
5580rpm.png
stevieturbo
Posts: 3577
Joined: Tue Aug 02, 2011 12:08 pm
ECU Model: No ECU
Location: Norn Iron

Re: Problems with RPM limit

Post by stevieturbo »

In Diagnostics, are you getting any missed crank teeth, rejected teeth etc ?
x30xe
Posts: 64
Joined: Tue Jul 26, 2011 2:56 am
ECU Model: S60 Pro

Re: Problems with RPM limit

Post by x30xe »

If you see crank errors in diagnostics, it's worth to check the sensor clearance and adjust it to DTA recommendations.
J.W.Woermeijer
Posts: 11
Joined: Mon Aug 19, 2013 10:23 am
ECU Model: S40 Pro
Location: Raalte | Holland
Contact:

Re: Problems with RPM limit

Post by J.W.Woermeijer »

thanks,

I will try it tonight if I have the time.
stevieturbo
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Joined: Tue Aug 02, 2011 12:08 pm
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Location: Norn Iron

Re: Problems with RPM limit

Post by stevieturbo »

J.W.Woermeijer wrote:thanks,

I will try it tonight if I have the time.
And if the problem is very repeatable. You can do a scope trace at any time. So you could try and do a capture when the problem is occurring.

But the diagnostics page should give some good info about the crank signal history
J.W.Woermeijer
Posts: 11
Joined: Mon Aug 19, 2013 10:23 am
ECU Model: S40 Pro
Location: Raalte | Holland
Contact:

Re: Problems with RPM limit

Post by J.W.Woermeijer »

Hello everyone,

Tonight I just went to the car.
I made a screenshot of the diagnostic menu with cold engine and after 33Km.
What I see is one crank wheel teeth error.
Do you see more problems?
(I know the air temperature sensor)

The crankshaft oscilloscope sees no problems by diffrence rpm's

After 33km the rev limiter still flip in.
so it is a constant problem ..

Best regards,

Jan-Willem Woermeijer
Attachments
coldstart after 1 week.jpg
after 33Kms.jpg
stevieturbo
Posts: 3577
Joined: Tue Aug 02, 2011 12:08 pm
ECU Model: No ECU
Location: Norn Iron

Re: Problems with RPM limit

Post by stevieturbo »

Reset all the values in diagnostics and try again.

There are a LOT rejected crank pulses there. In an ideal world that value would be zero.

And as I said, if the fault is repeatable, try a scope trace when the problem is occuring
x30xe
Posts: 64
Joined: Tue Jul 26, 2011 2:56 am
ECU Model: S60 Pro

Re: Problems with RPM limit

Post by x30xe »

So did you adjust sensor clearance ? 0.8mm could be starting point for your trigger wheel. Even 0.2mm may do difference in either direction. Also angle of the sensor may affect.

There are plenty of crank errors like Stevie told. Signal is very bad.
J.W.Woermeijer
Posts: 11
Joined: Mon Aug 19, 2013 10:23 am
ECU Model: S40 Pro
Location: Raalte | Holland
Contact:

Re: Problems with RPM limit

Post by J.W.Woermeijer »

stevieturbo wrote:Reset all the values in diagnostics and try again.

There are a LOT rejected crank pulses there. In an ideal world that value would be zero.

And as I said, if the fault is repeatable, try a scope trace when the problem is occuring
What do you mean by scope trace?
is this the option "crankshaft ocilloscoop" in the DTA?


And i will check the sensor clearance and angle.
Maybe is the space between them to big..
stevieturbo
Posts: 3577
Joined: Tue Aug 02, 2011 12:08 pm
ECU Model: No ECU
Location: Norn Iron

Re: Problems with RPM limit

Post by stevieturbo »

J.W.Woermeijer wrote:
What do you mean by scope trace?
is this the option "crankshaft ocilloscoop" in the DTA?


And i will check the sensor clearance and angle.
Maybe is the space between them to big..
YES

Do that first before moving sensors etc. And also reset the values in diagnostic screen too.
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