Speaking of negative MAF airflow -- is it typical of larger engines and turbos that you *need* to vent the BOV to atmosphere? Will said his car had a tendency to stall because of the air being released into the intake screwing up the MAF reading.WaterPog said:The only issue was a lift throttle stalling problem that turned out to be a deficiancy with the speedbrain and negative MAF airflow and not related to the turbo system at all.
Most stock turbo systems vent the BOV back to the intake, had a few turbo cars and were all like that. But it actually hurts the spool up on shifts or plainly when you let off the throttle.HairyCanary said:Speaking of negative MAF airflow -- is it typical of larger engines and turbos that you *need* to vent the BOV to atmosphere? Will said his car had a tendency to stall because of the air being released into the intake screwing up the MAF reading.
Dave
I'm thinking of bigger turbo systems, moving a lot of air -- like, V8 sizedDarkness said:Most stock turbo systems vent the BOV back to the intake, had a few turbo cars and were all like that. But it actually hurts the spool up on shifts or plainly when you let off the throttle.
HairyCanary said:I'm thinking of bigger turbo systems, moving a lot of air -- like, V8 sized. Basically the only time it would come into play would be aftermarket. The consensus I've seen on turbomustangs suggests that most people say that atmospheric BOV has no advantage to bypass.
Dont quote me on this, but I read somewhere that a BOV actually prolongs the turbo life, because of when you let off the throttle all the pressure go back against the turbine wheel and force it backwards, hence also creating longer spool up times.Toddzilla said:I don't see why it would. I think people just like the sound of a BOV.
Darkness said:Dont quote me on this, but I read somewhere that a BOV actually prolongs the turbo life, because of when you let off the throttle all the pressure go back against the turbine wheel and force it backwards, hence also creating longer spool up times.
That's what I've heard. But in the case where it causes the MAF to produce incorrect readings because of the disturbance of the air, I wonder if it becomes a requirement to vent it to atmosphere. I guess it would be a moot point if the MAF is setup as blow-through.Toddzilla said:I don't see why it would. I think people just like the sound of a BOV.
HairyCanary said:That's what I've heard. But in the case where it causes the MAF to produce incorrect readings because of the disturbance of the air, I wonder if it becomes a requirement to vent it to atmosphere. I guess it would be a moot point if the MAF is setup as blow-through.
Dave
Toddzilla said:I don't see why it would. I think people just like the sound of a BOV.
I wouldn't mindSLIGHTLY_INSANE said:In some circles, can you say status symbol?
Kinda like doing a couple purges of nitrous huh? I know some one that did it at a stop light next to a cop.HairyCanary said:I wouldn't mind. Yes, I'm a dork. But I think a nice rumbly V8 sounds real good. And if you're next to it right as it blows off 15 psi, that would be double cool. Just a very audible demonstration of what it's like having the best of both worlds...
Dave
Nitrous is cool, not next to a cop thoughDarkness said:Kinda like doing a couple purges of nitrous huh? I know some one that did it at a stop light next to a cop.
HairyCanary said:I wouldn't mind. Yes, I'm a dork. But I think a nice rumbly V8 sounds real good. And if you're next to it right as it blows off 15 psi, that would be double cool. Just a very audible demonstration of what it's like having the best of both worlds...
Dave
I'm pretty sure the problem has something to do with how the cam is degreed. There's not a lot of other good explanation for why the torque curve is so skewed to the bottom end.Toddzilla said:I do agree that you should maybe try to sort your combo out further.
14 at 3000 RPM, dropping to mid-13's for most of the run, down to just about 13 flat above 5500. See the dyno graph link in my sig, that was from a few weeks ago.What was your AF last time you were on the dyno?
Peak power ain't great, but the AFR's are making decent power under the curve in any case. I've only run on street tires, spinning through 1st & 2nd. My torque curve combined with 3.73's makes for a very squirrely launch on street tires. With traction I hope to add two or three mph to my traps, and hopefully get this pig solidly into the 12's. And maybe I'll let someone with the skillz (Chris) see what he can get out of it...But your car is running 105 mph, that's not bad at all....and it probably has more in it too.
Are you running on drag radials or street tires?
HairyCanary said:Hey, how about this.
Drop these into my car:
http://www.stangparts.com/products/partpic.cfm?TypeID=5&ID=4013&Page=1&ShowSpecials=FALSE
.. and ..
http://www.stangparts.com/products/partpic.cfm?TypeID=3&ID=3713&Page=5&ShowSpecials=FALSE
And skip the turbo...
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