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Discussion Starter #1
Hey guys,
some time ago I found a list of mods that autodelta released about a V6 EFI car and one of the mods was the fitment of a spacer in the pressure regulator to raise fuel pressure. Does anyone recall this modification. Im going to book my car in to have the fuel pressure raised by restricting the return line from the regulator however I am interested in the autodelta mod.
Cheers
 

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Probably you want more fuel after a set of modifications?
If this is the case, don't forget to have a "look" at the injector's duty cycle.
 

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Discussion Starter #3
Yup i need more fuel and less duty cycle

Yup Mr zagato I was looking for a little extra fuel as im running at maximum (100%) duty cycle at full throttle. The only mods I have is that i am running a haltec EFI so i have no AFM. The stock injectors work near there maximum with a standard set up so now I have lost the AFM I can run the duty cycle at 100% and this may not be enough fuel. I am pretty sure im getting enough fuel due to using a exhaust gas analyzer, seeing the exhaust gas and just seat of the pants feel for the car but i would rather run the duty cycle at 85 90 %. Autodelta modified the pressure regulator but I cant understand how they opened it as its a sealed unit. I guess they got units from the factory and modified them and then assembled them.
 

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Even if your A/F ratio is good, it's not a good practise to run your injectors at 100% dutu cycle. They will overheat!
I would suggest a maximum duty cycle of 80%.
Could you find a set of larger injectors and get rid of the regulator trouble?
I assume that they cost a lot!
 

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Discussion Starter #5
Mr Zagato

Yeah I guess that would be the best solution but yes its also the most expensive. I am not short of money however I have three Alfas and most important children to look after. I wonder if I could pick up some injectors from the local 'Pick A part' wreckers. They have loads of BMW's, do you know of any part numbers/modle numbers of cars ie: 318i of injectors that have a higher flow rate. I also have a strange phobia about putting non alfa parts on my cars.
 

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What's the flow capacity of your OEM injectors in cc/min?
I will have to return to home at the evening to check my documents and see if i can find anything helpful to you.
 
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