3000GT/Stealth International Message Center - View Single Post

Multiades · 10-07-2005, 06:23 AM

I agree that some portion of the fall-off could also be a control problem. I'm very dissatisfied with the boost controllers currently on the market. All of them are overly simple, designed to be used by someone who wants zero setup time, and they even fail at doing THAT well. I could design a rock-stupid control scheme that would get better results than what's currently on the market (I just couldn't build it because I'm shite with electronics).

Anyhow, why the interest in larger wastegate flappers at all? It WON'T decrease the turbine backpressure for an underutilized compressor because any reduction in pre-turbine pressure would result in some decrease in boost pressure - the two are intrinsically interrelated. If your boost creeps up, you need more flapper area, if it falls off or stays constant, you don't. Simple as that.

What is the diameter of the actuator cylinder on a TD04? I mean the smallest diameter -- not the lip on the can, but the can itself.

Calcs are impossible without that information, but we also don't have TD04 backpressure numbers.

10-07-2005, 06:23 AM	#57 (permalink)
Multiades vehicular thaumaturgist Join Date: Apr 2000 Location: Woburn, MA Drives: 1994 Stealth TT Trader Rating: (17)	Re: Measuring stock exhaust restriction I agree that some portion of the fall-off could also be a control problem. I'm very dissatisfied with the boost controllers currently on the market. All of them are overly simple, designed to be used by someone who wants zero setup time, and they even fail at doing THAT well. I could design a rock-stupid control scheme that would get better results than what's currently on the market (I just couldn't build it because I'm shite with electronics). Anyhow, why the interest in larger wastegate flappers at all? It WON'T decrease the turbine backpressure for an underutilized compressor because any reduction in pre-turbine pressure would result in some decrease in boost pressure - the two are intrinsically interrelated. If your boost creeps up, you need more flapper area, if it falls off or stays constant, you don't. Simple as that. What is the diameter of the actuator cylinder on a TD04? I mean the smallest diameter -- not the lip on the can, but the can itself. Calcs are impossible without that information, but we also don't have TD04 backpressure numbers. __________________ The Pansy Patrol - a 3000GT/Stealth car blog with how-tos Pearl Yellow 1994 R/T TT w/84k - FOR SALE! new 4-Bolt factory short block, DR StgII heads, Titan TD05 headers, 14B turbos w/ ported 7cm^2 housings, 3" minimum-bend catless exhaust, SCE oil pan, RPSII clutch, Fidenza flywheel, OZ F1 Plus 17x9.5" wheels, Kumho Ecsta MX 245/45 tires, Drweldin DSM SMICs, 3SX engine mounts (Maximal solid front), GReddy 60mm P/H/W boost, Carbotech Panther Plus & Bobcat pads w/ slotted/drilled rotors, KSport GT-Pro coilovers, Maximal rear camber arms, SCE balljoints, ABS delete w/ cockpit-mounted Wilwood proportioning valve, AC delete, EGR/evap/dashpot delete, cruise/vacuum-tank delete, '95 Lexan headlights, McCulloch 4300K HIDs, GReddy Type-S BOV, solid shift bushings; Misc Parts: Walbro341, 20# fixed-back seats, Accelerated Moto catch can