boost problem

[JeRNuT]

I was giving my new MPS some full throttle action the other night and when the boost really came on in first gear it felt like the fuel cut off for a second then came back. Almost like i hit the break really fast. If i give it gas slowly and smoothly this never happens. what is the possible cause of this. is this just something normal.? could the dealer have put in cheep gas?

Jeremy

 

[AFaceInTheCrowd]

its normal cuz of the fuel map. its running hella rich.

 

[JeRNuT]

running rich is better then lean.

Thanks

 

[ForceFed]

Yes it sounds like all the MSP's have this stumbling,stuttering or coughing problem.I personally HATE IT:mad: I think Mazda Needs to make a fix for this .Has anyone complained to their dealership about it I'm jujst curious because to me i dont beleive that a factory tuned car should have this type of problem.It almost feels like a hella miss most of the time and seems to get worse the warmer it gets outside .I personally am not looking forward to 90 degree weather and humidity in the summer!What do you guys think

 

[boostisgood]

Well Im taking my car to the dealer this weekend. Im gonna bring it up, and show them the info coming from my a/f gauge. It runs uber rich under throttle, then uber lean when no throttle present. This kinda got me worried a bit. It also seems that the ECU cant find a stoiciometric spot, it flucuates waayyy too much for me.

 

[ForceFed]

Hey Craig you are seeing normal readings from the A/F meter they never stay in the same spot because the computer is always compesating for different throttle conditions.At WOT it should be rich as per the programming and on deceleration (when you get off it )it will always go lean(full lean on the gauge )its in the design and the programming of all cars not just ours!

 

[funnylittlman]

i have heard that mazdaspeed is going to have some upgrades for the speed possibly by this summer (so says my buddy at the dealer)...

Could one of these mean a new ECU??

 

[Newf]

I woudn't hold my breath on an ECU upgrade from Mazda

 

[BremertonMSP]

Running rich while at full throttle, and seeing no a/f indication with no throttle, say on deceleration is normal. My 89 turbo Mustang does the same thing.
You really want to run rich under full throttle/boost conditions, else you will get detonation and burnt pistons/valves, etc...
Granted, they are probably running richer then they need to be, but it's safer to be rich then lean during boost conditions.

 

[funnylittlman]

I woudn't hold my breath on an ECU upgrade from Mazda

Yeah, I know

 

[RX-KEVIN]

9psi helps that problem out alot it feels like that's where the boost should have been from the factory

 

[I-Am-Chris]

Well Im taking my car to the dealer this weekend. Im gonna bring it up, and show them the info coming from my a/f gauge. It runs uber rich under throttle, then uber lean when no throttle present. This kinda got me worried a bit. It also seems that the ECU cant find a stoiciometric spot, it flucuates waayyy too much for me.

You dont want your car running stoich under boost. The reason it runs so rich is for the added protection of the motor. They dont want to lean it out to run badass but replace half the motors in peoples cars. simple get emanage or crank the boost