"switching off" horsepower on a p1sc LQ4
#43
9 Second Club
I think you will find the exhaust cut-out to be ineffective at sealing the intake at boost. The pressure in a NA exhaust system is not nearly as much as you will see under boost. I think you will have substantial pressure loss when you want it to be sealed off.
Andrew
Andrew
He's going to use the blade pre-blower to restrict air supply to the blower, which would give almost total control over power.
#44
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A variable restrictor plate is a simple way to go. I like it. Even on a N/A 6.0L that will certainly be over 350hp it would work great.
#45
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yeah would use the restrictor somewhere in the piping going from air filter to the procharger
#48
9 Second Club
The only thing to bare in mind here.
WRC cars can make 350hp breathing through something like a 32mm restrictor. Although they are very well tuned to achieve that
So dont get carried away and let lots of air in, as it could well take quite a small hole/opening to get power down where you want it to be.
#49
I think a wastegate on the charge piping would still be the best idea. Itd be easy to setup too. Use an EXTREMELY small spring (like 2-3 psi). setup a MAC valve with the "normal" flow route set to run pressure to the top of the gate only. This will hold it closed all the time (full power), then run the "switched" flow to the bottom of the gate. Put the valve on a switch in the car, when you hit the switch the wastegate will open with only 1-2 psi and vent the majority of boost, should be able to get you down to the n/a number or below (due to excess loss of driving the blower). Prob would need to be like a 60mm gate though, so that gate itself wont be too cheap. Unless you go with an ebay knockoff or something, which should be fine for this scenario.
Like everyone else said, the restrictions there seem absolutely insane. I cant imagine that type of program being cost efficient at all? (Mobile dynos, paying police to man these when they could be doing other things, paying engineers to test parts on every car thats inspected, etc) What a waste of taxpayer $$. If you ever decide to come over to the states, check out Oklahoma (where I live), or a few of the other states that have no vehicle inspections. Yeah were typically the most boring states, but it sure is nice literally being able to do anything you want to your car.
Like everyone else said, the restrictions there seem absolutely insane. I cant imagine that type of program being cost efficient at all? (Mobile dynos, paying police to man these when they could be doing other things, paying engineers to test parts on every car thats inspected, etc) What a waste of taxpayer $$. If you ever decide to come over to the states, check out Oklahoma (where I live), or a few of the other states that have no vehicle inspections. Yeah were typically the most boring states, but it sure is nice literally being able to do anything you want to your car.
#50
TECH Apprentice
A simple idea but likely hard to implement would be a clutch engagement of the blower drive that you can switch to OFF. That would return the engine to NA, you could even have a partial engagement where the blower still turns to look authentic but slips until locked by switch.
Dumb idea, as I have no idea how to do it, but simple concept :-)
Dumb idea, as I have no idea how to do it, but simple concept :-)
#51
TECH Senior Member
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I was thinking about this some more as I was driving today. If you were to go with a positive displacement supercharger, then the throttle body is ahead of the intake. Then, if you had something like the Holley Dominator system, you could simple program the throttle body to only open enough to make as little power as you needed. I can't recall if the Dominator ECU allows multiple tunes on the fly, if it did, this would solve your problems easily. You would just flip a switch to the "valet" or in your case "governmentapprovedbecauseweknowwhatsgoodforyo u" tune, and you're all set.
Andrew
*edit....I just looked it up and the Dominator ECU allows you to switch between 4 different calibrations on the fly.
**edit..edit...I actually see no reason that the same strategy can't be used with a pro charger.
Andrew
*edit....I just looked it up and the Dominator ECU allows you to switch between 4 different calibrations on the fly.
**edit..edit...I actually see no reason that the same strategy can't be used with a pro charger.
Last edited by Project GatTagO; 04-25-2014 at 09:30 PM.
#52
9 Second Club
I was thinking about this some more as I was driving today. If you were to go with a positive displacement supercharger, then the throttle body is ahead of the intake. Then, if you had something like the Holley Dominator system, you could simple program the throttle body to only open enough to make as little power as you needed. I can't recall if the Dominator ECU allows multiple tunes on the fly, if it did, this would solve your problems easily. You would just flip a switch to the "valet" or in your case "governmentapprovedbecauseweknowwhatsgoodforyo u" tune, and you're all set.
Andrew
*edit....I just looked it up and the Dominator ECU allows you to switch between 4 different calibrations on the fly.
**edit..edit...I actually see no reason that the same strategy can't be used with a pro charger.
Andrew
*edit....I just looked it up and the Dominator ECU allows you to switch between 4 different calibrations on the fly.
**edit..edit...I actually see no reason that the same strategy can't be used with a pro charger.
Does the Dominator allow full and programmable throttle control maps ? Or does it simply mirror pedal movements ?
#53
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naaaa andrew just a "drivenbyasteelwirefrommyfootthatpushesdownagasped al" throttle body from accel . also the HP EFI i got is way simpler than the dominator and i donīt know if i could do different tunes without hooking the laptop. but iīm gonna ask holley tech about that or maybe the 50000 page instruction could tell me more about it.