You are correct.Don't forget that there is boost pressure reference on the back side of the diaphram if you hooked it up that way. Makes it open sooner than just back pressure alone acting against the valve. So two factors to consider.
Allan G.
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SignUp Now!You are correct.Don't forget that there is boost pressure reference on the back side of the diaphram if you hooked it up that way. Makes it open sooner than just back pressure alone acting against the valve. So two factors to consider.
Allan G.
Take it out on the street and see if 5lbs is all she will make with your foot to the floor
I'm testing this on the transbrake I think its the safest way right now..
Take it out on the street and see if 5lbs is all she will make with your foot to the floor
Drive it?![]()
Drive it?![]()
Brad, next time you go to see Norbs, pick up the wrench off of the work bench and introduce it to the side of his melon, maybe, just maybe that might knock some sense into him.
Put 35 degrees of timing in it until say 10# of boost and start ramping it out. That will tell you what you need to know.
When you coming up on the trans brake how are you doing it, and how long does it take to get to 4100rpm?? Mike
norbs said:I'm pressing the transbrake button and puttin the pedal to the floor..How long it takes to 4100 rpm is.......4.3 seconds. I could add some more timing but I really want to retard it to to 3 BTDC total timing and put a heap of fuel in it on the 2 step, I need to test various ways.
I say I should be able to launch at 13 psi minimum, but the target is 35 psi after launch using gate pressure no Co2. Not sure if this is possible with my setup. The 4 port solenoid is very tricky you can forget about closed loop boost control......I will not even try that.How much boost do you really expect
I say I should be able to launch at 13 psi minimum, but the target is 35 psi after launch using gate pressure no Co2. Not sure if this is possible with my setup. The 4 port solenoid is very tricky you can forget about closed loop boost control......it will not work.
I'm pressing the transbrake button and puttin the pedal to the floor..How long it takes to 4100 rpm is.......4.3 seconds, and I would say the gate starts to open around 8 psi, slowing the spoolup. I could add some more timing but I really want to retard it to to 3 BTDC total timing and put a heap of fuel in it on the 2 step and see the results. I need to test various ways, might have to wire in the Power adder features.
I agree with Mike. Your best compromise of rpm rise and boost rise on the transbrake is going to happen with more timing against the transbrake. You're not using nitrous, so I'm not sure what the best timing number is going to end up being for your combination, but as an example with my car and the nitrous, when I first inject the nitrous at 2400 rpm, the timing is retarded to 10 btdc. As soon as the rpm begins rising, which is pretty quick, the timing ramps to 15 btdc by ???? rpm and stays there until I reach launch rpm and boost level where the nitrous is turned off. At that point, the timing returns to 31 btdc and the engine is able to maintain the launch rpm and controlled boost level. This strategy has given me the best compromise of rpm rise and boost rise.I cant see 3 deg before TDC EVER working!! Yes clutch cars do this because it makes the engine very lazy and they can go WO throttle and move a lot of air to spin the turbo. With an automatic that aint going to be possible without nitrious. And you would still need more timing.
On Rocks twin turbo car with no staging equipment. I hold the brakes hard enough to get the engine up to say 4000rpm (takes a few seconds to do that) Then ease off the footbrake to get into the beams. Apply transbrake and from this point it will take approx 2-3 seconds to make it up on the 2-step at 5600rpm and I believe about 15# of boost. This is just for some kind of reference as to how long it takes to get an average combo spooled up.
Im betting that more timing makes everything much quicker and happier. Im out!! Mike
norbs said:I say I should be able to launch at 13 psi minimum, but the target is 35 psi after launch using gate pressure no Co2. Not sure if this is possible with my setup.