After making a few more intakes for O9Factors car, its probably the MAF too close to the turbo...

Maybe you should just drive to AZ instead of flying us out to CO?

Then 15 psi

 

Leave it in gear as you decel and see if that stabilizes it.

 

mmmm.....tempting...that is alot of bOOOsssst!!! (well...relatively speaking) When i get my 20B we'll see just how high that bad boy goes

Ill def make a trip out to AZ...just dont know if i'll do it on R&R. If im feelin froggy tho...ill make a trip out...in the next couple o weeks...

E-magic...you got a new MAF configuration on hand to entice me...??

 

APV's locked open?

 

Closed.
Torque is more important than HP.

 

MM, I am having the exact same issue as Jamaalsmith. And I have started to leave it in gear when decelerating which has prevented stalls. Old habits die hard though and I want to put the car in neutral when coming to a stoplight or sometimes want to coast and take it out of gear.

 

It is almost always the relationship between the BOV and the MAF that causes this issue.
Either the BOV is opening too soon or too much, or it is causing reversion or it is VTA and throwing off the low-flow calculation.

 

Hi all great and interesting thread I have just read through. No doubt I ahve missed stuff, but I have manflu, so thats my excuse.
1. Congrats on the build and the numbers!
2. Question. I am thinking that the tuning was done with stock ECU and MAF via accessport combined with dyno tuning? Is that correct? There is no outboard ECU being used...?

How did you deal with the MAF? Is the intake MAF mount pipe just bigger dimensionally and scaled up to accomodate high air flow and trick the MAF into thinking that what it thinks is X is in fact Y (y being the real and bigger number?) Then that is combined with bigger injectors etc to flow the correct amounts all with OEM ECU?

Sorry for ignorance or missing something written earlier....

Is the current stall happening while coming off throttle and coasting (i.e. instant stall off throttle), or only when revs drop to idle?

 

so agree--like the TQ curve withe the apvs close.
OD

 

tell that to an FI driver . But yeah - I know what you are saying .

 

I take it you meant F1.
They have both.

 

OOPS - yeah F1
sure , we all have both . Pretty hard to have one without the other

 

Yeah, but it is pretty easy to find examples that have more of one than the other at one end of the RPM band or the other.
Most people that want "X" horsepower have no idea how that drives or what that really means.

I will take a 280 HP car with a relatively flat 300 ft/lb torque curve over a 400 HP car (with almost any typical torque curve that goes along with that kind of power)
any day.

 

I agree 100% . To me , saying "torque is more important than HP" sounded kinda open ended and open to misinterpretation ....

 

Sounds like someone wants a 4.6l ford block. Lol.

 

Hey!! i resemble that remark... lol

 

MM; Post 245 was a question you might know the answer for?

 

Yes, stock ECU and MAF with accessport. No other engine management. Stall is happening comming off boost to idle.

 

Stalling Rich or Lean?

Can you get us a log? That BOV and turbo set-up could definitely be causing your problems with air reversion....

if g/sec get all crazy coming off decel it could help you troubleshoot.

 

Good q Kane. I'll def get the log when i get home. I'm not even going to hazard a guess whether its going rich or lean. Jeff, did you pull almost all the fuel @ no throttle? I understand its probably not the tune and the MAF design reversion is probably messin with the readings.

 

i know i have a different set up but i also had that problem one time and it ended up being a intake line(not vacuum line) --somewhere-- that wasnt working right. MAF couldnt stabilize because of the venturi affect at higher rpm. It wasnt enought to notice on my a/f's, but just engough to mess with the idle after sudden decel.

 

Thanks OD, ill check all the lines too

 

if its stock MAF, which I think hits peak g/s airflow on normalish size intake at 365g/s, how did you set it up for the crazy big power you are getting?

 

Stock maf 365 g/s at 4.69 Volts. it can be extended to 5 Volts for higher airflow.

 

cool. how do you do that?