Auto trans mod
I have an SC300 with Aristo 2JZGTE TT + A340E.
My boost level is up a bit, the transmission is still stock.
I'm concerned that, on an upshift, the rpm drops while the boosted charge is in the manifold, big overload to the clutches! Even though the BOV will open if the pre-set is reached:
1. it's not fast enough
2. IDK how far down the boost drops
What to do?
It occurred to me that since the upshifts are controlled by solenoids, that wire can also be used to trigger an extra solenoid-operated BOV so that it purges exactly when the shift valve moves (just as fluid pressure is re-directed to engage the next gear). The signal could also be tailored by passing through a control box with an adjustable delay between shift signal and BOV operation, and how long to keep the BOV open.
Has anyone done this?
I'm not familiar with aftermarket BOV - are any of them solenoid operated?
Any ideas or comments welcome.
Thanks.
My boost level is up a bit, the transmission is still stock.
I'm concerned that, on an upshift, the rpm drops while the boosted charge is in the manifold, big overload to the clutches! Even though the BOV will open if the pre-set is reached:
1. it's not fast enough
2. IDK how far down the boost drops
What to do?
It occurred to me that since the upshifts are controlled by solenoids, that wire can also be used to trigger an extra solenoid-operated BOV so that it purges exactly when the shift valve moves (just as fluid pressure is re-directed to engage the next gear). The signal could also be tailored by passing through a control box with an adjustable delay between shift signal and BOV operation, and how long to keep the BOV open.
Has anyone done this?
I'm not familiar with aftermarket BOV - are any of them solenoid operated?
Any ideas or comments welcome.
Thanks.
You do have a valid point about not wanting to upshift at full power. I had a suprastick trans controller before going cd009, and it was great. It did exactly what you want (in a different way) when operated in manual mode. The A340 transmissions do not have engine braking when in "D". So, all you need to do is have a controller to control the solenoids. When you want to upshift, you take your foot off the throttle and the boost will dump, and the engine RPMs will drop to idle (no engine braking). Then toggle upshift to next gear. At this point the torque converter is still spinning at pretty much the same speed that it was when you took your foot off the throttle. So, you hit the gas until the engine speed gets back to the torque converter speed at which point you will pull again. That's how the suprastick works and that's what I think you want. Plus, it gives you manual control of the gears
As far as controlling an electronic BOV, I guess it could be done if it existed (I don't know if they do or not), and would also require an intercept control board to actuate the BOV when a change in valve signals occurs (there are 2 solenoids that control shifting through gears)
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PaCowboy
SC - 1st Gen (1992-2000)
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Dec 9, 2015 01:51 PM
