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Old 12-05-2018, 03:46 PM   #1
CBboY126
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Stock ecu vs. HP

I know this is a dumb/weird question. But has anyone ever ran the stock ecu to its limit? What I mean is, how much fuel can the stock ecu adjust for? IE: you have an EX with CAI a good header and a nice free flowing exhaust, now do some mild porting, bigger throttle body, I've even seen some guys run mild cams without a chipped ecu... at what point will the factory ecu become your bottle neck? From the get go? I know that some people throw in a chipped ecu asap and I've done the same in the past.. this is just a dumb weird thing I wanted to see if anyone has done before.
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Old 12-05-2018, 07:14 PM   #2
Raf99
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Injector size comes to mind. ECU is dumping based on this. If 330C is the max per injector.. fini.
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Old 12-05-2018, 08:27 PM   #3
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+/- 15% increase on the injector's duty cycle.

Ignition timing is your next parameter which can be advanced/retarded with the distributor.
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Old 12-06-2018, 05:52 AM   #4
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Quote:
Originally Posted by sonikaccord View Post
+/- 15% increase on the injector's duty cycle.

Ignition timing is your next parameter which can be advanced/retarded with the distributor.
How do you increase the duty cycle on an OEM ECU?
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Old 12-06-2018, 06:39 PM   #5
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Quote:
Originally Posted by Raf99 View Post
How do you increase the duty cycle on an OEM ECU?
Typically the ECU would adjust for more air by itself, but I guess you could use a method to trick the ECU into "seeing" leaner mixture and compensating by adding more fuel.

I don't think the stock ECU is smart enough to check for parameters that don't make sense. With that being said, I wouldn't be surprised if you could just add larger injectors. As long as the ECU sees the right mix (O2 sensor), it shouldn't throw a code. It's nice to have such a carefree ECU.
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Old 12-07-2018, 03:30 PM   #6
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