Hiya Paul,
After reading this post and your question I thought I'd put this link on here for you. http://www.turbosmart.com.au/boost_c...electronic.htm

Personally I don't like the use of manual boost controllers mainly due to the "wastegate creep". A manual controller will not allow the turbo to achieve your set boost level. An electronic one such as the one I listed above will help in the area you're requesting and eliminates "creep". It also has a feature to help with the operations of your WI. I hope this helps with your quest.

One more thing check out their product line they too have a dual stage controller. http://www.turbosmart.com.au

All you need to do is to out a solenoid valve on the exit hosetail of your manual boost controller.

Why would a MBC contribute more to wastegate creep than an electronic one.
If you have a ball/spring MBC it just opens at a set boost level at which point the wastegate is opened and hot gasses are diverted.

Creep happens when the wastegate cannot bypass enough exhaust gas to keep the boost under control. It can happen if the wastegate is too smal. I don't see how an EBC would differ from a MBC in this aspect.

And EBC might be better at controlling boost spikes because it can gradually decrease boost when the set level is about to be reached whereas an MBC is an on/off switch.

BTW, don't confuse a manual boost controller with a bleed valve. Maybe a bleed valve could cause creep. A bleed leaks pressure into the atmosphere. It might be possible that the wastgate never opens far enough. A boostcontroller is an on/off switch. Full pressure to the wastegate causing it to open conpletely, or no pressure.


But than again, I'm rather new to turbo-cars. But this is the way I understood it.

Janis

Richard, 95sprtcpedrvr and Janis,
Thank you all for your help. I think all in all the question of choice between EBCs and MBCs is a very personal one. My personal experience in tuning cars over the last six years has lead me to believe that boost from an MBC is more stable. That said, I am no professional, I have used only a very small percentage of the products available and I am a firm believer of the adage that if it ain't broke, don't fix it, which means I don't experiment much.

That said, I have an EBC in my twin turbo and like the cool lights display and manual override switch. I just find that at high boost settings it tends to stabilize far to slowly, whereas my MBC in my 1990 VR-4 gains boost fast and is rock solid stable.

I think EBCs have limitations but perhaps the e-boost with additional electronic processing power fixes that and it's ability to integrate with water injection etc is very attractive. The companies dual stage boost controllers are also very interesting. I do really appreciate the information 95sprtcpedrvr !!!

Richard, I really appreciate your input, but you have to accept that when it comes to electronics, I am an idiot. First of all i am not sure where to find this solenoid valve (especially here in Hong Kong !!!) although I will be in the UK in July if you have any idea where I can get one there. Secondly, it seems this solenoid vents the 'difference' in pressures we can run with or without water injection. This could be a problem on a dual stage system as it might not vent sufficient boost on the higher setting to bring us into our safe operating zone. Have I got this all wrong? could it be set up to reduce boost pressure to a specific boost level like 0.9 bar (or whatever the engine can safely handle) irrespective of the original boost level.

More importantly Richard, if I needed one, could you make it for me (I'll pay you !!!)

Paul.

Richard,

Sorry, just a thought. These dual stage controllers have a switch to change fro low to high boost. Couldn't we just wire that switch so that it was effectively on 'low' if any 'failure' signal was received, i.e, no water, no pressure (ruptured water line) or blocked jet?

If so, we could just set our low boost to a safe level that the engine could run at without any additional anti-detonation measures.


Paul.

http://www.aquamist.co.uk/sl/plist/p...4/806-234.html

This is a valve we supply. If you are in UK in July - you can pick one up form us - we are near Bighton.

Richard,
You are in Peacehaven right? That'll be great I only live about 4 miles from there in denton, just the other side of Newhaven and before Seaford. i guess I'll be dropping by in July !!!

Paul.

You are welcome to drop in anytime - please give me some warning, I don't always work in the office. Ring 581007.