ride5000

wow, lots of isht going on in here!

i will weigh in with my own experiences:

a) if you think that ANY EBC (regardless of price) has quicker response with less overshoot than a QUALITY MBC, you're on crack. at the very least i will say that you simply have not experienced what a quality MBC runs like. it is the very nature of the feedback-based control circuitry of an EBC to either get more stability (more precisely, lower Q), or speed. you cannot get both when you're talking about feedback systems theory. do not bother arguing with this point; it is in every EBC manual i've ever read.

b) i have a cockpit adjustble hallman evo, and it works absolutely wonderfully. what i mean by that is that 1) i don't adjust it more than i need to--essentially only when i want to run different boost, and 2) it holds consistent boost levels within a half a pound per square inch. if you have an MBC that cannot achieve this kind of performance than you need to either look at your choice in MBC, or look at your pneumatic circuit itself. you want low volume, high flow, low latency in your hose hookups... ALWAYS.

c) i do not like PTFB for drivability reasons. i have engineered around this by implimenting a GM solenoid along with my utec. the utec runs open loop boost and ramps duty cycle from 0 to 100% from 60 to 100% throttle position. the sole purpose of this boost map is to make the transition to full boost at WOT smoother. since it is such a linear, rudimentary map that varies solely according to TPS i will likely be replacing it with a simple DIY device that taps into TPS and outputs a variable duty-cycle solenoid driver directly. for more information see http://forums.nasioc.com/forums/show....php?p=7138642

hth
ken

mmboost

iTrader: (2)

Vaus, nope. I ran the EBC without the UTEC before I got the VF34. All the non-UTEC experience I have relayed are with the stock TD04.

jason

mmboost

iTrader: (2)

I dunno, Ken. I respect your opinions very much and won't take your rebuttles lightly. But... I know what I've experienced. To Vaus' credit, the only thing I can chaulk this discrepency up to is just not having been good at tuning my MBC. (Well, that's really not to Vaus' credit, but my discredit, heh). I dunno though... I spent a couple of months playing with both of MBCs and PTFB was the last of my worries. I was mostly concentrating on achieving a state where I didn't get spikes or creeps or overboosts, and this always forced me to compromise on the low end. I realize you must always compromise in some way... "you cannot have both" as you say. But my EBC seemed as punchy down low and much, much more consistent uptop and less spikey. Yes, this is an unreliable assdyno. But after a couple of months with MBCs, I had an almost instant appreciation for the EBC. As I have been saying in various ways throughout this thread, an EBC will have a quicker and more accurate response to feedback - an MBC is really fighting itself to control boost. Reading boost and controling boost with an EBC are separate and only effect one another as the electronic controller allows. It just makes more sense that electronic control will be more accurate and in the long version of all the problems that stand alone boost controllers cause, the EBC is the winner in combating them. That's my story, and I'm sticking to it

jason

ride5000

that's cool jason. we can amicably agree to disagree, as it seems!

the only question i have (which you may have already answered in this thread) is what kind of MBC were you running?

i started off with a joe p. ante-ing up and buying the much more expensive hallman was a bit of a gamble, but once i had it in my hands i could tell right off it was a much higher quality valve.

a quick and dirty test of the ball/spring type valves can be accomplished by trying to blow through them. the best valves make a TIGHT pneumatic seal when closed. generally from what i've seen the larger ball types make a better seal than do the small ones. they also have a long spring to keep the linearity of spring tension as constant as possible. a fine threaded adjustment rod is easier to dial in.

i'm just giving my pov on the issue. maybe i'm in the minority, but i won't NOT run an MBC on my car--they're just too simple, too reliable, and too effective.

now play nice, you two.
ken

mmboost

iTrader: (2)

ken,

i had a vishnu (dawes) and then one of the earlier txs ones - got it used and dont recall the model.

jason

EQ Tuning