Braket Racing With EFI
- Thread starter tvt59
- Start date
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I would think it would matter whether you want to protect the engine or win some race worth ?? how little ??
I don't remember details, but the old Yellow Bullet had a story about a run where a fuel pump, etc dropped the ball and the EFI saved the engine by being able to ramp up the fuel and prevent a lean out He had the logs posted and you could see it happen
I don't remember details, but the old Yellow Bullet had a story about a run where a fuel pump, etc dropped the ball and the EFI saved the engine by being able to ramp up the fuel and prevent a lean out He had the logs posted and you could see it happen
RockinRobin
Well-Known Member
I run a holley sniper 4500 on my gen 3 race motor with a drag pak manifold. First of all, it would be money well spent if you tune it on a chassis dyno first. Now that mine runs a consistent number I turn the learn mode off and run it in open loop with it set at -10% and +15 or +20 % so it can compensate for weather and air conditions. When the weather is cold, I use a tune that aims for .1 lower AFR just to give it a little richer mixture when the air is cold. I try to change the target AFR first and let it adjust mixture based on that. Get yourself several spare O2 sensors and have them with you. Better to have them and not need them than the other way around! I run leaded 110 race fuel and the sensor generally lasts about one season before crapping out on me. Read the datalog after every pass it will tell you if you need to adjust fuel. I have mine set to turn itself on at 4000 rpm so it turns itself on during the burnout without me having to worry about it.
Thanks for the information. I have Holley Dominator EFI. I was wondering how long the 02's would last on leaded race gas. I have two complete fuel systems on my Dakota. The plan is to go from the end of staging to the finish line on alcohol. From the finish line to the staging lanes on gasoline. From what I understand the ECM will data log without having to buy anything else, other than the laptop. I'm a few months away from making passes. But I want to get an idea in my head where to start.
RockinRobin
Well-Known Member
Wow, do you have to turn the motor off to switch fuels?
RockinRobin
Well-Known Member
My O2's cost me about $75 a piece as I recall, so it's not a huge expense, you just don't want them going out on you in the middle of a race!
It has a map selector switch on it. You do have to turn the engine off. It supposedly takes 5-6 seconds to switch from one map to another. You can load 4 maps in it.
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