dubulup

just the question...

what psi do you open the gates to the secondaries?? (I assume before the injector staging)

what is your ignition split?

would this be worth while running zero split? or is it only taken advantage of running neg. split in vacuum??

TIA (hopefully some folks in FL will chime in)

pistonsuk

Are you reffering to a staged tb similair the to factory design from 2nd and 3rd gens? If so these open at a given throttle position, not boost. I dont think it is possible to make boost on the factory setup while in the primary only. I would think that it would be best to have the primary alone open enough to motor you around town. Anytime you are trying to make more power than this it will probably be best to haev the secondaries open.

Justin

dubulup

no, the 3rd gen has a double throttle that opens at a given coolant temperature...can't speak for the TII.

I think I can make a couple psi with just primaries...I'm looking to make vacuum to low boost more responsive.

bcty

TII had the same

dubulup

Thanks for that...and if I wasn't clear before, I'll be rewiring the actuator to be boost sensitive not sensitive to the wax pellet.

I've seen this concept in V-Twin motor cycles, secondary plates that open closer to 0psi to induce a faster flow thru smaller ports.

SidewaysR1

Sounds like a really interesting idea. Doing this, you will lose the primary function of the double throttle plates though, which is preventing to much boost from getting to the engine prior to it being upto operating temp. But alot of ppl, including myself have removed these plates all together so i guess thats a moot point. At low boost, will just the primaries flow enough to actually produce more low end power. If so, then in theory this should help out the bottom end response. Keep us updated if you get it working, maybe some before and after dynos or boost response graphs?

j9fd3s

iTrader: (3)

i dunno, car always feels better when those are either working properly, or wired open. i have no data, just butt dyno

rx7tt95

I havent' had much of a chance to experiment with the setup I use as of yet thanks to a rock splitting my oil pan in half and grenading the motor. Once the motor is back in the car, I'll mess around with it a bit more after break-in and initial tuning. But don't expect anything soon

GUITARJUNKIE28

the secondaries are closed under heavy vacuum anyway. might be easier to just use a delay diaphram thingy--like the stock t2's.

dubulup

^care to explain to me how the secondaries are closed under heavy vacuum

dubulup

I don't deliver fuel to the secondaries until 3psi...why give them air, until just before then?

GUITARJUNKIE28

pop off your elbow and put a vacuum pump on the diaphram.

dubulup

I still have no idea what you are referring too.


^these are the ones I'm talking about modifing


this is the TB I'm using.

the secondary butterflies have a slight lag opening to them...that's it.

GUITARJUNKIE28

apply vacuum there, and those will close

dubulup

I didn't think that's how the stock TII operated?

stated earlier in the thread.

I'm looking to run a solenoid, that the Haltech will operate, at a given psi, the solenoid will shut off the vacuum source.

rotarygod

iTrader: (1)

While they may in fact do something when the engine is cold, on the 2nd gens, when you go from part throttle to full throttle, the secondary plates close for a brief second and then open slowly. This is to smooth out the sudden air shockwave going to the engine to allow a more seamless transition. That's all they are there for. It's about smoothness at quick throttle changes. If there is ever a problem with them though, on the 2nd gens, they default closed. On the 3rd gens if there is a problem they will default open.

GUITARJUNKIE28

i'm not really talking about how or when the t2's operated, just the smooth opening. use your imagination and you'll get what i'm talking about.