Q&A / Tech

Mailbag: Maximizing Mustang Mods

Got questions?

We’ve got the answers—the Summit Racing tech department tackles your automotive-related conundrums. Last week, we tackled a rich air/fuel condition. This week, we’re helping maximize some already-potent Mustang modifications with larger fuel injectors and airflow upgrades.

M.T. • Frackville, PA
Q: I’ve been upgrading my 1989 Ford Mustang LX for quite some time. It currently has an Edelbrock Performance RPM 347 EFI engine with a BBK underdrive pulley set, Edelbrock 75mm throttle body, JBA Cat4ward headers, Snow Performance Stage-2 Boost Cooler, and a supercharger system. I’m still running the stock 19 pounds/hour fuel injectors and mass air meter. What size injectors and meter should I use to enhance my current mods? Also, what’s the best gear ratio to run? My Mustang has the stock automatic overdrive transmission.

A: You’ve got a great power-building setup, but we’d recommend stepping up to a set of 24 pounds/hour fuel injectors and matching your existing throttle body with a 75mm mass air meter. This combination will give you a steady rpm range without any power-robbing flat spots.

As far as gear ratio, we’d recommend using a 4.10 ratio with that automatic overdrive transmission. It’ll put the power to the pavement on the street and at the strip.




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One Comment

  1. Good advice here on this one. However, I’m surprised your tranny is still intact. Lol and actually, you may even want to go to 36lb injectors. Also, add a higher pressure fuel pump if you have not done so.

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