Backfire when shifting

[Draco-REX]

Originally Posted by canu_50

That was also on my list, but i tought the ecu could compensate since i am running 94 and not 91. I will put back the stock intake to see if it still does it, if it does it's propably the Cat.

First, octane has no bearing on air/fuel ratio.

Second, changing the intake around the PRIMARY air/fuel sensor will definitely change things if you don't get a tune.

Third, the ECU can only compensate for a skewed MAF while in closed loop mode. It can only GUESS when you're in open loop. And considering that the ECU enters Open Loop when being driven hard, and the higher rate of the air in the intake can change the shape of the flow around the MAF, you have no idea how an intake will effect your fueling when you're at full throttle.

Intakes without tunes are never a good idea.

[ill86]

^ what he said. Your a/f mixture is off bc of the intake. You're off throttle/back on throttle (tip in).

[2pt5RS]

Are you sure it's backfire and not pre-fire? Some intakes are known to pre-fire, and the noise is coming from the intake itself, not the exhaust.

[WolfsFang]

i might have to buy this intake now :o

[canu_50]

Originally Posted by 2pt5RS

Are you sure it's backfire and not pre-fire? Some intakes are known to pre-fire, and the noise is coming from the intake itself, not the exhaust.

No really is Backfire, i hear it from the back and resoning in the muffler.

And i know octane won't change anything on A/F but will change on timing and timing is a factor when having backfire...

[canu_50]

And I knew the A/F could be off a little bit, i just didn't think it could be that off.

And the fact that nobody I know with this intake as this problem, therefore i tought maybe there was something else.

[Josh B]

Not really a backfire. A backfire is when you get combustion in the intake system of the car and is a problem. What you are experiencing is most likely unburned fuel igniting in the hot exhaust system. In some vehicles, when a driver shifts up and lets off the accelerator, the engine has a moment of running rich. This causes an incomplete burn which causes the fumes to explode in the exhaust system along with an audible pop or bang sound.

[TouchMyHonda]

Originally Posted by DR1FT

you are running rich and you need a tune.



Go back to the Honda Forums.

Go back to http://zilvia.net/. I have more tuning experience in the turd I just dropped that you MIGHT have in one of your brain cells.

This happens running rich or not.

[DR1FT]

Originally Posted by TouchMyHonda

Go back to http://zilvia.net/. I have more tuning experience in the turd I just dropped that you MIGHT have in one of your brain cells.

This happens running rich or not.

From the op's statement it only happened when he added an intake he definately needs a tune. And you should know that as a "tuner" hahaha. It's not a happy noise like what you said. It can hurt the OP's engine and like what other people said his gas mileage. So go back to the Honda forums and jst prove yourself there.

[Josh B]

How is that going to hurt an engine? Provided his AFR is within spec, a little unburned fuel igniting in the exhaust system is perfectly normal.

[TouchMyHonda]

Originally Posted by DR1FT

From the op's statement it only happened when he added an intake he definately needs a tune. And you should know that as a "tuner" hahaha. It's not a happy noise like what you said. It can hurt the OP's engine and like what other people said his gas mileage. So go back to the Honda forums and jst prove yourself there.

Been there done that. Look up my build thread if you are so considered. Also, if you had any knowledge on theses cars. Most of the companies developing full exhaust and intakes are using the oem stock tunes to show gains. Not one single company has blown a motor or damage the motors using boltons with a stock tune.

Will that show true maximum gains and fuel efficient? No. Will it destroy your motor? No. Additionally if you were intelligent, you know know that an intake would never cause enough change to damage a motor from a car with an extremely conservative tune oem.

I've driven plenty of exotic cars that do this off the dealer lot many times more often that a more standard general public automobile. All cars backfire, all the time, constantly. Some naturally, some due to bad tunes. There can be at least 1000's of reasons why a car will fart.

Why don't you post up your motor builds and tuning experiences mr. drift. Lets see your impressive background.

[Accurate Race Shop]

I have the same intake get a tune that won't let your rev fall below 800 and it will go away.

[canu_50]

Originally Posted by TouchMyHonda

Been there done that. Look up my build thread if you are so considered. Also, if you had any knowledge on theses cars. Most of the companies developing full exhaust and intakes are using the oem stock tunes to show gains. Not one single company has blown a motor or damage the motors using boltons with a stock tune.

Will that show true maximum gains and fuel efficient? No. Will it destroy your motor? No. Additionally if you were intelligent, you know know that an intake would never cause enough change to damage a motor from a car with an extremely conservative tune oem.

I've driven plenty of exotic cars that do this off the dealer lot many times more often that a more standard general public automobile. All cars backfire, all the time, constantly. Some naturally, some due to bad tunes. There can be at least 1000's of reasons why a car will fart.

Why don't you post up your motor builds and tuning experiences mr. drift. Lets see your impressive background.

Exactly what i think! thank you.

I am not scared in anyway neither do i care about my mileage i track the car...

The reason why most people never had backfire before is because when you are running full cat it shouldn't happen. This was the reason i was asking, and it's not a backfire that will be seen from outside you ear it pop in the exhaust.

I will keep driving my car like that until i get my headers and full exhaust and tuned at the same time. I do not believe in tuning a car that is N/A after only an Intake.

[TouchMyHonda]

Originally Posted by canu_50

I will keep driving my car like that until i get my headers and full exhaust and tuned at the same time. I do not believe in tuning a car that is N/A after only an Intake.

True that. Wait till you have a full exhaust and buy a tune. You will see gains with NA bolton's usually with an OEM tune. The cost of a tune simply isn't justifiable for an intake only. I fully believe with oem internals, Minus cams and maybe valve springs.... that this car NA could make 250-280 wheel.