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Old Dec 21st, 08, 11:34 PM
74axledragger 74axledragger is offline
 
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Default twin turbo carb and ignition tuning please read

first off thank you all for your kindness and help especially to big dave, but i have my twin turbo setup almost complete and i recieved my new mighty demon 850 blow thru carb, but how do i adjust the timing over stock to compensate for 5 - 10 psi boost total and how do i tell if its getting enough fuel or to add more fuel to compensate for boost like and what tools do i need to check to make sure its getting enough fuel over the rpm range. just trying to get it all dialed in. thank you all once again for putting up with all my newbie posts youve been really kind
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Old Dec 22nd, 08, 09:53 AM
1Bad'66 1Bad'66 is offline
 
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Default Re: twin turbo carb and ignition tuning please rea

For the timing you can use an MSD BTM: the boost timing master. What this does is pull timing per psi of boost. (1st set it where the motor likes it n/a, then I lock mine out)

Fuel: you will need a boost referenced fuel pressure regulator. This will add fuel pressure per pound of boost that is made.

To check to make sure how much fuel/or if you are getting enough you should run a wideband oxygen sensor system to keep track of your air/fuel ratio. This is, in my opinion, is the best way to make sure that your 'tune' is spot on.

Hope this helps ya!
Scott
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Old Dec 22nd, 08, 10:12 AM
Big Dave Big Dave is offline
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Default Re: twin turbo carb and ignition tuning please rea

What Scott said.

You can buy a MSD Programmable Digital-7 Plus Part No. 7531 ignition box along with the boost module to pull out timing, it is fully programmable and it also records 20 seconds of ignition data.

Barry Grant and Aeroquip both sell the boost referenced fuel pressure gauge.

Wide band is an absolute must and you will need a data acquisition box to keep track of your motor as things are happening far to fast otherwise.

Big Dave
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Old Dec 22nd, 08, 08:19 PM
74axledragger 74axledragger is offline
 
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Default Re: twin turbo carb and ignition tuning please rea

thank you all so very much i am much abliged
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