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Old 04-03-2009, 04:27 PM   #1
TLG
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Default Vortech FMU Ratio

I searched for a while and couldn't find an answer to my question.
So i'm in the process of finishing up my turbo set up and i was wondering what ratio i would need with my set up. I ran the numbers in the formula in the DIY FAQ and the 10:1 seemed what i would need at 110 psi but i need some help from you guys.

Here's my set up:
1.8 injectors (tan top)
stock fuel pump
T25 at 7 psi

I know, i know, MS is the way to go but that's just not feasible right now. Trust me it will happen eventually. But for now i'm just gonna run the vortech unit.

So what ratio FMU do you think i need and should i be okay with the stock fuel pump?
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Old 04-03-2009, 04:35 PM   #2
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usualy you need to run between 6 and 8 pounds of extra fuel per pound of boost. there should be a chart with your fmu that tells you which disk and ring to use. If you don't have that you can download it from the vortech website. and probably not (for your pump)
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Old 04-03-2009, 05:32 PM   #3
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Quote:
Originally Posted by TLG View Post
I searched for a while and couldn't find an answer to my question.
So i'm in the process of finishing up my turbo set up and i was wondering what ratio i would need with my set up. I ran the numbers in the formula in the DIY FAQ and the 10:1 seemed what i would need at 110 psi but i need some help from you guys.

Here's my set up:
1.8 injectors (tan top)
stock fuel pump
T25 at 7 psi

I know, i know, MS is the way to go but that's just not feasible right now. Trust me it will happen eventually. But for now i'm just gonna run the vortech unit.

So what ratio FMU do you think i need and should i be okay with the stock fuel pump?
Stock fuel pump will max out at 78~80 psi if it is in good shape. I would leave the 12:1 disc in the Vortec, take it to 7psi of boost and listen for detonation. If I remember correctly, the stock fuel pump can only support 8psi of boost with the 1.8 injectors.

Don't forget to retard your timing about 1 degree off stock for each psi of boost.
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Old 04-03-2009, 05:51 PM   #4
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Thanks guys. I forgot to mention, timing will be set at roughly 6* BTDC
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