Calibrating a 4 cylinder engine

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Re: Calibrating a 4 cylinder engine

Postby Holden202T » Wed May 22, 2013 11:02 pm

yeah on whatever the item is your wanting to change

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Re: Calibrating a 4 cylinder engine

Postby POZE » Tue May 18, 2021 10:50 pm

I'm having a problem with stalling when coming down to idle. It shows a TPS stuck code 19. When reviewing the logs I see TPS volts change with throttle movement but the TPS percentage stays at 0. I cannot see any patterns that point to certain conditions, it appears to be random. Any thoughts?
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Re: Calibrating a 4 cylinder engine

Postby POZE » Wed May 19, 2021 6:47 am

I also noticed battery voltage is erratic. It will drop by 4 to 6 volts at times when reviewing logs.
Are these signs of a corrupted Bin?

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Re: Calibrating a 4 cylinder engine

Postby davidthiele » Sun May 15, 2022 5:20 pm

I just found this post - very late I know. You stated at the start that you were using 20psi fuel pressure. That seams very low as most EFI engines use approx 45psi (3Bar). Not sure if you ended up sorting it all out but low fuel pressure would give you lots of dramas.
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David

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Re: Calibrating a 4 cylinder engine

Postby BennVenn » Wed May 18, 2022 8:38 am

The TBI typically runs 17-20psi rail pressure so I don't think that's the problem here.

I've got a tune here for a TBI 1.6 using 12P. I got it close but it was never quite right - I don't think the algorithm it uses is suited for TBI setups. I tried it on my bug and on a 1.6 Pulsar. I'll fetch it from my laptop later today if it'll help.

You will need double fire always on, you will need to set the memcal to 2cyl TBI mode or else it'll only fire every second dizzy pulse which is not suitable for a TBI. Reported duty cycle is half of actual duty and AE never worked as well as it does on multipoint. I remember having to use unusually large AE numbers to try remove that hesitation / lean afr on cracking the throttle. A super rich idle (~13 or lower) helped but that came with its own issues.

For the VW I ended up using the stock pulsar/astra TBI tune and adjusted the fueling and timing. The AE and pooling issues were still there but not as severe as 12p. I ended up changing to multipoint and all those problems went away.

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Re: Calibrating a 4 cylinder engine

Postby antus » Wed May 18, 2022 4:49 pm

It does work for TBI fine. We based our TBI on Charlescrown and after tuning VE and Spark (stock injectors) it runs perfectly. viewtopic.php?f=26&t=6786&p=100922#p100922
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Re: Calibrating a 4 cylinder engine

Postby BennVenn » Thu May 19, 2022 7:10 am

Perhaps it's more related to manifold design, length and probably more Important - heating than 12p not being well suited to TBI.

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