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UPDATE Re: [GMCnet] EFI vs Carb [message #326441 is a reply to message #326033] Tue, 28 November 2017 12:03 Go to previous messageGo to previous message
GMC Jimmy is currently offline  GMC Jimmy   Canada
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Registered: September 2016
Location: Niagara, Ontario
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UPDATE... still on the proverbial fence.
Considered EFI, asked on the forum about opinions for and against. Received several opinions and decided that before I made my final decision I would speak with Dick Paterson.

Excellent conversation with Dick lead me to lean heavily in favor of Carb rebuild with distributor re-curve etc. Then after doing more research and talking with a few others that have experience with EFI systems I decided to order the Fitech Go Street EFI with the FCC (fuel command center).

After reading a blog from a member of this forum regarding his install of the Fitech EFI (I read it after I ordered and received my EFI) I began to question the need for the FCC as I was hoping for possible relief from vapor-lock as well as peace of mind & efficiency.

Decided I would move forward with the EFI but not include the FCC in my install and go with a new mechanical fuel pump with the return port, which I do not have on my current pump. My thinking, along with the assistance of a friend who is assisting me with this project, was that I could do a few more things to reduce vapor-lock issues by wrapping heat shielding sleeve around my fuel lines and fuel filter and run some new hard fuel lines away from exposure to areas of direct heat where possible.

Then when testing the fitment of the new EFI throttle body and the existing air breather it became evident that I would need to make some adjustments to make everything fit comfortably under the hatch. (I do not want to raise the hatch above the floor line)

As a side note, when you read that these systems are a direct fit - bolt on system, the system might fit but the accessories you require will probably need modification. This system requires a fair bit of playing with and adjusting to make things fit properly.

When it became obvious that I would not be able to make the throttle body and existing air breather assembly fit without modifying the hatch and the assembly due to the fixed fuel return port on the EFI, I decided to re-consider the carb once again.

Thinking this challenge through raised the option of a cold-air intake system with a ultra low profile air plenum / carb hat. This would allow for the EFI to mount on the intake while providing air from a cone style filter on the end of a snorkel positioned down in a area which will receive good air flow, while not interfering with the floor hatch.

I can design and weld up a custom low profile air plenum which will fit but do I require a specific amount of space in the air plenum to make this all work, CFM?

Will I need an MAF sensor? (I'm not sure if the Fitech has one built-in)

Has anyone else experienced this and which air filter did you use?

As always thanks for your experience and suggestions,

Regards,
Mike

[Updated on: Tue, 28 November 2017 18:41]

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