Comments on: Optimising turbo boost control for performance and fuel economy http://blog.autospeed.com/2008/12/04/optimising-turbo-boost-control-for-performance-and-fuel-economy/ AutoSpeed's Blog. Opinion and Auto News Comment Thu, 19 Jan 2012 10:07:00 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: Alex http://blog.autospeed.com/2008/12/04/optimising-turbo-boost-control-for-performance-and-fuel-economy/comment-page-1/#comment-57148 Alex Fri, 02 Jan 2009 08:49:02 +0000 http://blog.autospeed.com/?p=5558#comment-57148 You could use the intelligent water spray kit to detect "fang" and operate a relay instead of using a dash mounted switch... :) You could use the intelligent water spray kit to detect “fang” and operate a relay instead of using a dash mounted switch… :)

]]> By: FRUGAL_ONE http://blog.autospeed.com/2008/12/04/optimising-turbo-boost-control-for-performance-and-fuel-economy/comment-page-1/#comment-52295 FRUGAL_ONE Tue, 09 Dec 2008 22:56:56 +0000 http://blog.autospeed.com/?p=5558#comment-52295 The new generation engines coming out of Europe are small cc's with turbo fitted. Better performace/economy than a larger cc N/A engine. FIAT Group/FPT have a bi-cylinder coming out in 09', a new technology called "Multiair" NFI, and also S2 Common Rail diesel, all to complex for me! Cheers, F-0 The new generation engines coming out of Europe are small cc’s with turbo fitted.
Better performace/economy than a larger cc N/A engine.
FIAT Group/FPT have a bi-cylinder coming out in 09′, a new technology called “Multiair” NFI, and also S2 Common Rail diesel, all to complex for me!
Cheers,
F-0

]]> By: Ben http://blog.autospeed.com/2008/12/04/optimising-turbo-boost-control-for-performance-and-fuel-economy/comment-page-1/#comment-50778 Ben Fri, 05 Dec 2008 07:41:25 +0000 http://blog.autospeed.com/?p=5558#comment-50778 Why would you need it? You can't use the IEBC to increase the strength of a vacuum signal source and open the valve further. The wastegate will be open as far as it can with whatever manifold vacuum you have at cruise. A check valve should be the only thing that's needed, if it even needs that. Why would you need it? You can’t use the IEBC to increase the strength of a vacuum signal source and open the valve further. The wastegate will be open as far as it can with whatever manifold vacuum you have at cruise. A check valve should be the only thing that’s needed, if it even needs that.

]]> By: Howard http://blog.autospeed.com/2008/12/04/optimising-turbo-boost-control-for-performance-and-fuel-economy/comment-page-1/#comment-50772 Howard Fri, 05 Dec 2008 02:07:19 +0000 http://blog.autospeed.com/?p=5558#comment-50772 I have an external wastegate fitted to 1 of my cars and it has 2 ports fitted to it. 1 side takes a pressure line (obviously) to push the valve open, and the other side could be used to take a vacuum signal with a 1 way valve from the after the throttle body to pull the valve open. How about using the independent electronic boost controller to modulate a solenoid valve in the vacuum line to help set up a lower back pressure cruise condition? I have an external wastegate fitted to 1 of my cars and it has 2 ports fitted to it. 1 side takes a pressure line (obviously) to push the valve open, and the other side could be used to take a vacuum signal with a 1 way valve from the after the throttle body to pull the valve open. How about using the independent electronic boost controller to modulate a solenoid valve in the vacuum line to help set up a lower back pressure cruise condition?

]]> By: Ben http://blog.autospeed.com/2008/12/04/optimising-turbo-boost-control-for-performance-and-fuel-economy/comment-page-1/#comment-50503 Ben Thu, 04 Dec 2008 07:00:00 +0000 http://blog.autospeed.com/?p=5558#comment-50503 I would say 1), switch feeds. Because most boost control system (especially the ones at the budget end of the scale) are pneumatic, so don't have a map sensors. An interesting thing I noticed when my boost controller is set high (it keeps pressure from getting to the wastegate, rather than bleeding it off) is that it takes about 3psi manifod pressure to leave closed loop at 100km/h, but with it set low it switches to open loop at about 0.5psi. It's an interesting quirk which means that one particuar hill can be taken in closed loop on 'high boost' (and slightly less throttle), but open loop and higher throttle on low boost. I'm guessing that in that one particular situation the car is more economical with the wastegate shut.. I would say 1), switch feeds.

Because most boost control system (especially the ones at the budget end of the scale) are pneumatic, so don’t have a map sensors.

An interesting thing I noticed when my boost controller is set high (it keeps pressure from getting to the wastegate, rather than bleeding it off) is that it takes about 3psi manifod pressure to leave closed loop at 100km/h, but with it set low it switches to open loop at about 0.5psi.

It’s an interesting quirk which means that one particuar hill can be taken in closed loop on ‘high boost’ (and slightly less throttle), but open loop and higher throttle on low boost.

I’m guessing that in that one particular situation the car is more economical with the wastegate shut..

]]> By: Brent http://blog.autospeed.com/2008/12/04/optimising-turbo-boost-control-for-performance-and-fuel-economy/comment-page-1/#comment-50479 Brent Wed, 03 Dec 2008 20:52:25 +0000 http://blog.autospeed.com/?p=5558#comment-50479 In an automatic turbo car it might be an option to link the changeover to torque converter lockup. If the car is already sensing steady state to lock up the torque converter then why not use that to swap between manifold sensing and compressor sensing. How were you thinking of changing over control? 1) solenoid that switches where the pressure for the map sensor is sourced? 2) two separate map sensors that are switched electronically? In an automatic turbo car it might be an option to link the changeover to torque converter lockup. If the car is already sensing steady state to lock up the torque converter then why not use that to swap between manifold sensing and compressor sensing.
How were you thinking of changing over control?
1) solenoid that switches where the pressure for the map sensor is sourced?
2) two separate map sensors that are switched electronically?

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