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Old 10-10-2011, 22:15   #46
kins
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Looking forward to seeing how you get on. Is this going on your R33?
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Old 11-10-2011, 21:43   #47
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yes mate my 33gtr. cars running, just need to add some more fuel lower down as its making alot more air flow lower down the rev range and going lean.. will get onto it asap..
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Old 06-11-2011, 19:52   #48
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Any updates mate?
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Old 09-11-2011, 17:58   #49
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hi mate, went for mot and passed, just need to find somewhere to run it in anger now, its currently sorned of the road and for sale lol
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Old 17-12-2011, 22:53   #50
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ill beat berny to it.
had it on the rollers today for some mapping,and did what it says it does.

previouse it made 1 [email protected] and now @3300 all good

only prob it needed 2.5 bar to move the 1bar actuator on boost,actuator works fine so it must be pressure against the flap holding it shut.

im thinking of a electric acutator with rpm rather than boost related switch over for the next step.
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Old 18-12-2011, 00:04   #51
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yeah but that woud hamper a car that was twinscroll from the factory.. so youd lose yout twin scrll manifold for a ordinary one,fit a laggy turbo,then fit the divider plate??
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Old 18-12-2011, 09:45   #52
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hi guys, been a while sorry, funds have been very tight so no dyno..

anyway as jon says above. this is a superb bit of kit.

below are the graphs. the boost graph on its own is the motor before the gate.and the dastek one is yesterday.

now because the valve should only work to around 4k we only mapped upto that intially. we found that alot more air volume was entering the engine and it was very lean. so we added fuel. you can see the difference. the issue was the gate would not open. i am in touch with the guy in america who designed this.we manually fed the actuator and as jon says it took 2.5 bar to switch it over then the motor suddenly would not pull so we aborted to investigate further.
on the dastek graph bottom right. the red line is the pressure the turbo is making in psi,the small yellow line on the same graph bottom left corner is when i manaully added pressure to the gate as the motor increased in rpm. as we got to 2000rpm in added pressure to the gate and by 3000 rpm the gate opened and the motor did not like it at all so we shut down hence the sudden drop.

with this set up your twin scroll manifold is not touched from std.

if we can find a way of switching the gate open then i suspect what you will end up with is the responce of a very small turbo and the power of a very large turbo.

will keep you guys updated when i know more.

here are the graphs.








also if you look at the dastek graph bottom left. this is boost. the red line was leaving the valve shut. you can see the power drops at 5000 rpm. this is because the rear is in effect a .48 and too small at that rpm. also you can see it makes 1.2 bar from 3100 rpm. this is insane for a gt4094r . the blue line underneath is when we t,ed into the actuator line to measure the pressure .

Last edited by rockabilly; 18-12-2011 at 09:47..
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Old 18-12-2011, 09:49   #53
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i would have to say even though we have issues if sorted i believe this would be a mental set up for an 800bhp skyline. responce of small twins+ power of a large single. i believe when right you will have full boost 1.5 bar by 3600 which would be very impressive. i will update as i know more guys..bernie

p.s all comments are welcome guys. i am experimenting and it could all be for nothing, but willing to try..

Last edited by rockabilly; 18-12-2011 at 09:51..
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Old 18-12-2011, 10:26   #54
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looking forward to the final results
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Old 19-12-2011, 14:35   #55
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Old 20-12-2011, 11:07   #56
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any electrical guru,s on here?.

i want to use a linear actuator to control this via the ecu. my link g4 ecu has a 12v output i can use via a relay. trouble is the linear actuators has one red and one black wire and require feed down one wire to open(red) and feed down the other wire(black) to close.. tricky?lol idea,s guys
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Old 20-12-2011, 16:05   #57
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would a relay not work to supply a switched 12v to each of the actuator feed wires? then the ecu output used to throw the relay from 1 to the other? seems simple enough...
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Old 20-12-2011, 22:52   #58
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i doubt you will get the speed and precise control you need.
the very reason AMS abandoned the twin turbo (compound?) setup using actuators. they just couldn't get control right.
i dont think your thinking of a simple and speedy on to off at x revs actuation will be the way to go. in theory sounds like it yes but the sudden change in apparent A/R will upset the running so much that what you gained in spool will be lost in the time the engine/ecu needs to reconfigure/settle
really hope it pans out dead easy but i have a hunch
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Old 15-02-2012, 21:27   #59
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quick update. think we may have sorted this by using a larger diameter actuator, the original one was only 1.5 in diameter. the new one is 2.7 inch.

did some rough testing.

in 3rd gear @2000 rpm, plant the accelerator to the carpet and full boos ,1.5 bar is there by 3900rpm, where as b4 it was 4750.. so about 850 rpm spool increase on an 800bhp turbo.well happy..

boy does it pull from low down now.. egts on the motorway at full chat are 900 max too..
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Old 22-02-2012, 23:04   #60
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