Slow car...

[Bullitt]

Disclaimer: I'm not a K-Jet mixture guru. Am just pointing to advice from the exhaust kit vendor here.

Question: Did you take notice of the advice DeLorean UK lists for installation of their kit? They explain some fuel delivery/pressure adjustments. (noting that these adjustment methods probably don't apply with the cat conv in place - DeLorean UK can answer in any case). I see you did a CO tweak.

https://www.deloreango.com/us/stainless-exhaust.html

After installation [of their no-cat headers/exhaust] you will want to adjust the fuel mixture - if you haven't already got a mixture adjustment screw bung then you'll want one of these (see below). The simple technique is - turn screw right until the engine dies, then turn screw left until the engine dies, then turn it back to the middle of those 2 points, and insert the bung. You should also re-shim the primary pressure regulator to 5.4bar to get the most out of this system - see the K-Jet shim kit.

I asked about this when I bought the new fuel distributor... He said it was not necessary when the fuel distributor was new... But maybe I was not clear about owning the exhaust as well..

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[Bullitt]

I asked again. Only the fuel mixture needed adjustment.

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[Dangermouse]

Did you drive the car before the frame off?

Meaning - does it seem slow compared to driving it before the frame off, or just compared to other cars ?

[Bullitt]

Yes I did, it is a few years ago though. Remember it as beeing more responsive.

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[NckT]

I asked about this when I bought the new fuel distributor... He said it was not necessary when the fuel distributor was new... But maybe I was not clear about owning the exhaust as well..

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Just to note that the oxygen sensor electrical connection (located at the rear of the firewall under the drivers side wooden board behind the grey rubber plug) needs disconnecting first to set the frequency valve to 50% before doing the fuel adjustment. (You can refit it afterwards if you so wish for a bit of extra fuel economy)

The shim of the fuel distributor primary pressure to 5.4 bar (78 psi) compensates for leaning off at higher rev range for the UK exhaust.

I would recommend you also get an emission reading as one adjusted with a non catalysed exhaust, you'll likely to get a reading between 1.0 to 1.5% CO and HC less than 250-300ppm. Any higher then further investigation on the injectors is required.

I'll assume you've checked the vac operation at the Control Pressure Regulator!

[Bullitt]

First I will check vacuum on CPR (i guess procedure is well covered on this forum), disconnect the O2 sensor and adjust fuel mixture with a dwell meter. I think we only have an electrical multi meter that does this. Not sure if this one shows in degrees og %. If it does the opposite of what the manual says, any idea on how to convert the values?

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[Bitsyncmaster]

First I will check vacuum on CPR (i guess procedure is well covered on this forum), disconnect the O2 sensor and adjust fuel mixture with a dwell meter. I think we only have an electrical multi meter that does this. Not sure if this one shows in degrees og %. If it does the opposite of what the manual says, any idea on how to convert the values?

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With the O2 sensor disconnected, the lambda ECU will hold the FV at 50% duty cycle no mater what mixture you set. So you can not use a dwell to set mixture with the O2 disconnected.

[Bullitt]

With the O2 sensor disconnected, the lambda ECU will hold the FV at 50% duty cycle no mater what mixture you set. So you can not use a dwell to set mixture with the O2 disconnected.

Ok, Thanks!


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[NckT]

Just to note that the oxygen sensor electrical connection (located at the rear of the firewall under the drivers side wooden board behind the grey rubber plug) needs disconnecting first to set the frequency valve to 50% before doing the fuel adjustment. (You can refit it afterwards if you so wish for a bit of extra fuel economy)

The shim of the fuel distributor primary pressure to 5.4 bar (78 psi) compensates for leaning off at higher rev range for the UK exhaust.

I would recommend you also get an emission reading as one adjusted with a non catalysed exhaust, you'll likely to get a reading between 1.0 to 1.5% CO and HC less than 250-300ppm. Any higher then further investigation on the injectors is required.

I'll assume you've checked the vac operation at the Control Pressure Regulator!

Just to clarify, as with Bitsyncmaster, if you use a dwell meter, connect the oxygen sensor. If you want to follow the text described on the deloreango website for "rule of thumb basic setting", the oxygen sensor needs disconnecting.

[Bullitt]

I see I have a different CPR... Any input on this?

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