part throttle boost
12-01-2007, 05:16 PM
#12
0.0 BAR
Join Date: Nov 2006
Posts: 0
Re: part throttle boost
Your turbo shouldn't be building boost at part throttle cruising.
I can't even think what would cause that, there shouldn't be enough gas to move it faster than the flow of the exhaust gas. When cruising it's just like an N/A car.
Can you give a bit more detail as to how Dodge controls the boost? Seems to be electronically gated but even then you wouldn't see massive boost at cruise or part throttle.
I can't even think what would cause that, there shouldn't be enough gas to move it faster than the flow of the exhaust gas. When cruising it's just like an N/A car.
Can you give a bit more detail as to how Dodge controls the boost? Seems to be electronically gated but even then you wouldn't see massive boost at cruise or part throttle.
12-01-2007, 06:05 PM
#14
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Join Date: Jan 2006
Location: Mother Fucking Washingtion
Posts: 0
Re: part throttle boost
My brother in law had a srt4 and when he put his forge wg on his srt4 it would give him mad part throttle boost. But your srt has a knock sensor so if you get any kind of det your ecu will pull timing. But since you arnt really putting a huge load on your car I dont think it would be a big deal. The way we fixed this is we put a bigger turbo on the car and went with a external wg. (have you seen how small the stock turbo is? the wg port is tiny on the thing)
12-02-2007, 03:45 AM
#18
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Thread Starter
Join Date: Sep 2007
Posts: 43
Re: part throttle boost
haha , ya boost is fun i was just curious... im not so much worried about it on my car, im more worried that im gonna be on my bike at 6k rpms and boost will start creeping... but ya it is no cruising, its during acceleration... and no it is not an electric gate...
12-02-2007, 11:52 AM
#19
1.5 BAR
Join Date: Jul 2007
Posts: 752
Re: part throttle boost
it sounds like your wastegate boost source is on the engine side of the throttle, if this is the case, when you lift, will go low and close the wastegate INCREASING the boost in front of the throttle and thereby forcing it to flow more air to the engine.
think of the throttle like a divider of pressure, these figures are random and way off, but it will illustrate the point :
15psi, you lift to half throttle, you end up with 5psi in the intake manifold and 15psi behind it, but plenty of exhaust gas exiting the engine.
because the wastegate now sees 5psi, it closes and increases turbine speed to try and obtain 15psi BEHIND the throttle thereby potentially increasing it way above 15psi between the compressor and throttle.
i cant see any other way that would happen either unless you have it plumbed wrongly. fiy, i also have mine plumbed wrongly, and experienced a similar thing. i'll fix it as soon as i get back to my project.
if you have it plumbed correctly ... if your speed and therefore engine speed is increasing, then you could be outflowing the wastegate and building more boost that way i guess. either way, if its 15psi on the engine side, its sure as hell higher on the other side!
fred.
think of the throttle like a divider of pressure, these figures are random and way off, but it will illustrate the point :
15psi, you lift to half throttle, you end up with 5psi in the intake manifold and 15psi behind it, but plenty of exhaust gas exiting the engine.
because the wastegate now sees 5psi, it closes and increases turbine speed to try and obtain 15psi BEHIND the throttle thereby potentially increasing it way above 15psi between the compressor and throttle.
i cant see any other way that would happen either unless you have it plumbed wrongly. fiy, i also have mine plumbed wrongly, and experienced a similar thing. i'll fix it as soon as i get back to my project.
if you have it plumbed correctly ... if your speed and therefore engine speed is increasing, then you could be outflowing the wastegate and building more boost that way i guess. either way, if its 15psi on the engine side, its sure as hell higher on the other side!
fred.
12-02-2007, 12:11 PM
#20
Guest
Posts: n/a
Re: part throttle boost
Originally Posted by fe3tcourier
it sounds like your wastegate boost source is on the engine side of the throttle, if this is the case, when you lift, will go low and close the wastegate INCREASING the boost in front of the throttle and thereby forcing it to flow more air to the engine.
think of the throttle like a divider of pressure, these figures are random and way off, but it will illustrate the point :
15psi, you lift to half throttle, you end up with 5psi in the intake manifold and 15psi behind it, but plenty of exhaust gas exiting the engine.
because the wastegate now sees 5psi, it closes and increases turbine speed to try and obtain 15psi BEHIND the throttle thereby potentially increasing it way above 15psi between the compressor and throttle.
i cant see any other way that would happen either unless you have it plumbed wrongly. fiy, i also have mine plumbed wrongly, and experienced a similar thing. i'll fix it as soon as i get back to my project.
if you have it plumbed correctly ... if your speed and therefore engine speed is increasing, then you could be outflowing the wastegate and building more boost that way i guess. either way, if its 15psi on the engine side, its sure as hell higher on the other side!
fred.
think of the throttle like a divider of pressure, these figures are random and way off, but it will illustrate the point :
15psi, you lift to half throttle, you end up with 5psi in the intake manifold and 15psi behind it, but plenty of exhaust gas exiting the engine.
because the wastegate now sees 5psi, it closes and increases turbine speed to try and obtain 15psi BEHIND the throttle thereby potentially increasing it way above 15psi between the compressor and throttle.
i cant see any other way that would happen either unless you have it plumbed wrongly. fiy, i also have mine plumbed wrongly, and experienced a similar thing. i'll fix it as soon as i get back to my project.
if you have it plumbed correctly ... if your speed and therefore engine speed is increasing, then you could be outflowing the wastegate and building more boost that way i guess. either way, if its 15psi on the engine side, its sure as hell higher on the other side!
fred.
