Surge At Part Throttle

Doug Zinn

New Member
May 25, 2015
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I've done another build in a 95 gt. My question is why do tuners not take the time to tweek the part throttle/cruising rpm (1600-2400) in everything I've ever built. My build I'd a 347 stroker, 579/579 comp cam 236/248 @.050, 114ls. Trickflow heads, trickflow upper/lower intake, bbk 75mm tb, mac longtubes, NO egr, 75mm maf, and 36lb fuel injectors. I'm not really that savvy at self tuning to buy a moates, or tweecer system. I'm really thinking about selling off my efi stuff, and going bigish carb set up. I have the money, and is not a DD. What should I DO?
 
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Yea!!! I get the same damn answer from every shop go to for the last 4 of the 5 cars I've put together. I have a big cam and have to deal with it. Every one is less then 600 lift.
 
What's your complaint about how they've tuned it? To some degree there's only so much they can do to overcome the limitations of your hardware. For example if your header runners are too big you're going to lose some torque. If you're experiencing surging it's possible it's tuned a little lean at low-load cruise RPM's. They should be easily able to adjust that for you. It's actually an area on the dyno that's a little difficult to simulate, sometimes you're better off using a tuner that studies your datalogs than just a dyno session (where they understandably often focus on peak power and idle and often don't spend a lot of time on the in-between).

Personally I'd never go backwards to a carb if I could avoid it. Tons of expense for a poorer experience, in my experience. If you can tune a carb and ignition the old-fashioned way, you can easily do it yourself with Moates / Tweecer. Lots of guys here to help you if you get in over your head. There's also a few guys who remotely tune professionally who could probably get you fixed up.