Misses around 5500

[sp98awd]

I have a mildly modified 2G: T-28, rre downpipe, and catalytic converter, Apex N-1, manual boost controller, iridium plugs, taylor wires. Question the car misses under heavy acceleration at around 4500 to 5500 rpm, any ideas what i missed, or need to cure problem

 

[MattnGsx]

I have a mildly modified 2G: T-28, rre downpipe, and catalytic converter, Apex N-1, manual boost controller, iridium plugs, taylor wires. Question the car misses under heavy acceleration at around 4500 to 5500 rpm, any ideas what i missed, or need to cure problem

What do you mean by miss? We need more info. What are you boosting, how many psi? Is it ay WOT? Could be fuel cut.,cold be maxed out injectors, could be plugs and wires, could be coil pack.

I had a similar problem with my car at 14psi, with about the same setup as you. It was my coilpack.


-Matt

 

[sp98awd]

I thought someone would ask for details. I am running about 14 psi, and the miss happens at full throttle, the plugs are about 25,000 miles, the wires the same.
I am also getting better mileage than before I just wondered if I could be running a little lean.

 

[UndergroundR32]

What size injectors do you have and do you have anything to control fuel?

 

[sp98awd]

Stock injectors, no fuel controllers, and no intake upgrades but one is coming.
Thanks for the help, and info.

 

[Jetblack]

inspect the plugs to see if they're fouling out and are they factory rated heat range

 

[Jason_99ozGS]

inspect the plugs to see if they're fouling out and are they factory rated heat range

Also check the spark plug gap. Should be around .028". If it's gapped too large it's not going to run well under boost.

 

[MattnGsx]

You should also ditch the plugs too, I was using the same plugs when I was having problems. Also does your car "back fire" or just "shut down", when it misses?


-Matt

 

[DevilSperm]

id start out simple with the fuel filter

 

[WhiteTsiAwd]

I would be almost 100% sure that its the spark plugs. Either they are bad or they arent gapped right like mentioned before. I would replace them however with NGK's.

 

[MattnGsx]

id start out simple with the fuel filter

Thats how it goes when you own a DSM!

Let us know if plugs fix the problem, a new fuel filter would be a good idea too if you have never replaced it before.

-Matt

 

[UndergroundR32]

Thats how it goes when you own a DSM!

Let us know if plugs fix the problem, a new fuel filter would be a good idea too if you have never replaced it before.

-Matt

Seriously... I can't stand the trial and error method for fixing things

 

[sp98awd]

Again, I want to thank everybody for the help, I'll check the plugs, and fuel filter.
I have to say it, DSMer's kick butt, you can always find help from them no matter what site you'r on.
I'll get back to you........Thanks.