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BigAl · P4 Joined: 06 May 2003 Posts: 2996 Location: U.K Surrey

ZP,
how restrictive is the current plenum chamber and AFM.
Is it possible to remove them both and replace with a MAF on one of the throttle bodies and fitting air filters for each of the throttle bodies, would this allow for more airflow and then more fuel?
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x2 33 16v
pictures http://www.alfa-pages.co.uk/viewtopic.php?t=5203

ZeNiTh-PbArM · Posted: Tue Nov 18, 2008 12:05 am Post subject:

Hi,

removal of the plenum and AFM is the way to go but fitting a pressure sensor is tricky as these engines never generate stable vacuum at low revs and proper idle and progression phases are difficult to achieve.
The poor man's direct ram air conversion involves removal of the plenum chamber and mechanically linking the AFM flap to the throttle. Low end torque is poor but this setup has proven efficient for race (high revs) applications.

regards,
zp

BigAl · P4 Joined: 06 May 2003 Posts: 2996 Location: U.K Surrey

how about changing the throttle sensor and piggy backing the output, instead of having the normal, closed or wot, you could change it for a variable one that has the same voltage range as the default and could then feed the afm output, instead of jerry rigging the afm up???
How do you get round the problem of idle using the jerry rigged afm?
_________________
x2 33 16v
pictures http://www.alfa-pages.co.uk/viewtopic.php?t=5203

lee16v · Posted: Fri Nov 21, 2008 2:52 pm Post subject:

On the topic of injectors....I have obtained a set of 4 which I plan to change for mine. I'm going to ultra sonic bath them as I have access to a bath but my question is this, What liquid would be best to use? Demin water?

ZeNiTh-PbArM · Posted: Sat Nov 22, 2008 11:07 am Post subject:

BigAl,

you can always convert the fuel system to something better but this might be expensive. On the quick setup i described you can achieve reasonable idle but this mod is not intended for everyday driving anyway.

lee, please avoid the ultrasonic bath, in my experience it tends to dissolve rust & crust that cause the injector to sit tight in its seat. When the crust has gone away the injector is leaking and hot restarts are a nightmare. If you still want to have them cleaned, use ordinary gas as a cleaning agent, you need to pump the fuel through the injector in the REVERSE flow direction while the injector is hooked to an electrical supply that switches it on and off quickly.

regards,
zp

BigAl · P4 Joined: 06 May 2003 Posts: 2996 Location: U.K Surrey

I was looking for a cheap everyday driving mod that would make a lovelly induction noise, as i miss my carbs, oh well. i was thinking of geting my injectors cleaned, but when its done it just looks like they connect them the normal way around, should i ask for them to be done the other way round???
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x2 33 16v
pictures http://www.alfa-pages.co.uk/viewtopic.php?t=5203

ZeNiTh-PbArM · Posted: Sat Nov 22, 2008 1:42 pm Post subject:

hi, yes cleaning the injectors is done pumping gas through the nozzle as the crud will likely be expelled through the same path it came in. Otherwise the biggest particles might not be small enough to get out through the nozzle.
Oh and i forgot, replace the small filter at the injector inlet while injectors are off the car.

regards,
zp

lee16v · Posted: Sun Nov 23, 2008 6:01 pm Post subject:

Thanks ZP for the info.

BigAl · P4 Joined: 06 May 2003 Posts: 2996 Location: U.K Surrey

I mentioned getting my injectors cleaned toa car modding place and was asked what mileage they have done, about 60k and i was laughed at.
The manual says that cleaning should be done at set service intervals, i cant remember what though, should i get mine done?
_________________
x2 33 16v
pictures http://www.alfa-pages.co.uk/viewtopic.php?t=5203

BigAl · P4 Joined: 06 May 2003 Posts: 2996 Location: U.K Surrey