Can getting excessive fuel cuts hurt your engine? I recently got a dual stage boost controller and I get quite a bit in the higher gears. Sometimes the Service Engine soon light comes on, then I unscrew the negative on the battery and reset it. I was just wondering if it can cause damage?

 

Yes Turn your boost down before you regret it. Better yet, you may want to take that boost controller out altogether.

 

Sounds like you have a lot of problems... I wouldn't be pushing your car that hard until you figure out what is causing the CEL light to come on that often... and why you're getting fuel cut in the first place.

 

you do know that there is a eason why check engine lights exist?

it is there to worn you about something and you need to check it out and take care of it. resetting the ecu everytime it happens and keep driving like usuall is probably not the smartest idea.

 

The guy at Flis motorsports that installed it said that the Evo features "boost cones" that when the car reaches 25 PSI it will cut the fuel to the engine and stop the boost, then resume acceleration. I don't get them like every second, maybe I didn't clarify enough, my fault. It happens mainly when I dump the gas in 4th gear, moreso in fifth. It doesn't happen always, just when I get so much gas in there and the boost controller blows a 25 psi shot. The service engine soon light comes on when the boost exceeds 25PSI more than once in the same gear. it is a safety feature integrated that makes the car think that the ECU is telling it to run 25PSI, so then you're supposed to take it to mitsu and have them fix the ECU or whatever. But the ECU isn't making it run 25PSI its the boost controller on cold nights that causes it to, or when too much gas gets in. I was just curious to see if that the fuel cuts can hurt the engine, and I've contacted mitsu and flis a few minutes ago and they both stated that the fuel cut prevents the boost from being used, so it protects the engine, I was just thinking that it messed the engine up due to those jerks it gives, my mistake.

 

btw, I then lowered stage 1's boost power with a few tightening twists with the alan wrench, it doesn't get any fuel cuts now. I'll need to acquire a boost guage in the near future to tune it better so that I can get the most PSI out of it without fuel cut. For now I will leave it where it is.

 

OK, in this case you will definitely want to follow my suggestion of removing the boost controller. In fact, please sell it in order to get a boost gauge

 

There isn't any point or need to remove it. Its working fine. It cannot hurt the car, the car has a built in safety feature that prevents it from harming it. The only problem with fuel cuts is the annoyance that they bring. I ordered a boost guage.

 

are you seriously running 25psi on almost stock car?

if you are than you are about to learn a valuable lesson in safety and reliablitiy. since i don't think you have any gauges than how can you tell f your car is detonating?

 

No offense dude, but you NEVER should have even attempted a boost controller without a boost gauge. Period.. 25psi is just WAY too high to spike, its not that 25psi isn't possible, but there are other supporting mods, and tuning, plus gas quality that you need to take into account. A safety feature will not guarantee no damage.. Not only that, your actually hurting your performance and drivability MORE by allowing it to happen.. Not to mention the possibility of damage.

As everyone else says, take out your boost controller until you can get a gauge and properly adjust it. You should never be spikin gover 25psi, Your low adjustment should be around 18.5psi and high should be 20psi, the safest settings to use since you will periodically spike higher with an MBC.

 

I understand that. The thing is very low now. I didn't set it to 25PSI to begin with. I am saying that the car fuel cuts at 25PSI. I had it set to 22 or so and when the air is cold it spikes higher. Now its much lower than before to avoid any over spiking. But I didn't want it to be set at 25 nor did I attempt to set it that high.

 

OMG

Take it out

I cant believe that you dont have a boost guage

Personally i would follow what they are saying and take it out
NOW~!

 

It's a safety feature...sure, but it can only do so much. Believe me, you can still put a nice big hole in your piston

 

I understand.. I've personally had an occasion spike in cold weather, its the nature of using an MBC. Even 22psi is still rather high unless your running high octane gas.

Fuel cuts are abrupt ways of preventing damage to the engine, It can actually do harm, never rely on it as a foolproof safety measure. That was really my point..

The best gains your going to see with a stock car and just a boost controller is to maintain the stock boost level through redline, that is about 18.5-19psi, This way, occasional spiking will rarely lead to fuel cut.

Just my 2 cents..

And please don't take offense at this, but you should try to learn a little bit more before making modifications to your car. Make an educated decision based on your mods, then work with a shop that can also offer educated advice. Personally, I would have been appalled that they set you up with a boost controller, WITHOUT also adding a boost gauge. Without advising you that its unwise not to have one. REGARDLESS of if they used a temporarily mounted boost gauge, I would personally have refused to make that sort of modification without my customer knowing the consequences of it being improperly adjusted. I'm shocked that ANYONE advised you that its ok to hit 25psi and hit fuel cut on occasion without potential damage.

 

How could I determine if it has damaged the car? Or would it be obvious?