Worried about Knock

[coyfish]

Just stay out of boost when DD'ing. Thats what I do.

 

[matsuda]

Yes you can, but dont do it part throttle. you gotta get on it enough to make the open loop transition or else your car will be at 5psi running ****** 14.7 afr's with a s*** ton of timing (thats closed loop operation basically). go ahead and do it, im not saying you will blow but its certainly putting stress on your motor thats not needed.

What???

The MS3 has a wideband primary O2 sensor.
Closed loop does not equal stoich.

Anyone with a DH (or equivalent) probably already knows this.

 

[matsuda]

Surely the car can be boosted saftley at less than max psi and under lower revs (say 3,000 rpm...)?

Yes, of course it can.

Those who believe otherwise (implying that Mazda engineers are total morons) should sell their car immediately.

 

[Saskatchewan17]

That's what I thought...

 

[08cosmic3]

I never go WOT below 3500 rpm.

 

[bigdaddy]

dudes, stop listening to byker or whatever, this is getting a bit ridiculous. The point is, dont go WOT in high gear at low RPM's, and dont attempt to put large amount of load on the engine. You can essentially feel when you are loading the engine, just be careful. Its not like our car is in a special category of cars. Just drive it carefully, maintain it, and stop worrying so much. I get OCD about stuff like this, but this is beginning to seem dumb. This is why I shouldn't be on the forums, it makes my hyper-paranoid...

 

[Saskatchewan17]

it makes my hyper-paranoid...

Same here. Everytime someone posts about any problem I think "Holy s*** that is going to happen to me!"
Hah.

 

[tunersteve]

Too many people think they fully understand the vehicle, and not enough have a clue.

Hate to say it, but this thread is full of nonsense.

 

[Saskatchewan17]

All these differing opinions makes it really hard to know what is correct and what is not.


But I think we can all agree that you shouldn't boost and load the engine up too much in the lower rpm range.

 

[bigdaddy]

All these differing opinions makes it really hard to know what is correct and what is not.


But I think we can all agree that you shouldn't boost and load the engine up too much in the lower rpm range.

fair enough

 

[bigdaddy]

Too many people think they fully understand the vehicle, and not enough have a clue.

Hate to say it, but this thread is full of nonsense.

directed at me, or byker?

 

[bykeryder4life]

What???

The MS3 has a wideband primary O2 sensor.
Closed loop does not equal stoich.

Anyone with a DH (or equivalent) probably already knows this.

closed loop has an afr TARGET of stoich. if it strays off target then your fuel trims take it into account and do whats needed to bring it back close to stoich. Yes the MS3 has a wideband primary O2 sensor, I read off it with my DH. And last I checked, closed loop = stoich for a complete burn and good emissions. thats why you are cruising around town and idling right around stoich. Anyone with a DH knows that, you dont idle at 12.0 and cruise around in the 11's afr....

As for the whole open loop/ closed loop on/off switch thing, you guys are freaking out over nothing. Im not saying you blow motors doing part throttle boosting but its putting alot of strain on your engine when you do. That, along with the engineering/design problems this platform has makes for zoom zoom boom.

I learned all this open/closed loop driving s*** from Laloosh, and old ms3 owner. If you think Im wrong, ask him, I dare you. he knows his s***. he will say the same. drive either in vacuum or in full boost if you are worried about blowing your s*** because PT boost isnt good on this car.
what the **** do I know though I've only driven around fully bolted for 30k on my own tune

 

[onelsono]

OP, dnt wory about ur car. just dont do anymore of that 6th gear low rpm wot pulls. thats terrible for the car. if u wanna be safe, dont hit boost when ur daily driving.

idk if this is correct or not, but i herd that u shouldnt do any half throttle pulls b/c considering the turbo is so small it will be at almost full boost and ur afr is still in the 13-14's.. makes sense to me but thats just wut ive herd.

 

[hugador]

No half throttle pulls while daily driving? pffft good luck with that.

 

[matsuda]

closed loop has an afr TARGET of stoich. if it strays off target then your fuel trims take it into account and do whats needed to bring it back close to stoich. Yes the MS3 has a wideband primary O2 sensor, I read off it with my DH. And last I checked, closed loop = stoich for a complete burn and good emissions. thats why you are cruising around town and idling right around stoich. Anyone with a DH knows that, you dont idle at 12.0 and cruise around in the 11's afr....

Of course the AFR is stoich during idle or cruise.

However, closed loop on the MS3 does not have a fixed AFR target of stoich (that obviously wouldn't make sense).

Since you have a DH, you (or anyone else with a DH) can easily confirm this.

Log AFR (commanded and/or actual) and open/closed loop and try a variety of different engine loads.

 

[onelsono]

No half throttle pulls while daily driving? pffft good luck with that.

(scratch).... y should any1 have luck with that, i do it everyday.

 

[GoFast]

well this is turning into a "chicken little said the sky is falling" thread now isn't it?

 

[tunersteve]

I see this thread having little value.

 

[onelsono]

lol

 

[hugador]

(scratch).... y should any1 have luck with that, i do it everyday.

Exactly, it's impossible not to.