Reply With QuoteIs it fitted before, after or instead of the wastegate modulator?
Master
SubscriberHi, What will be the benefit on having an manual boost controller? As the discovery i bought has it installed on it by the previous owner.
YarnMaster
Is it fitted before, after or instead of the wastegate modulator?
Discovery Td5 (2000), manual, tuned
Master
Subscriberthe boost solenoid was connected to one side and it is in an T piece and then going to the waste gate
YarnMaster
That manual controller can increase boost without messing with the wastegate rod and IMO it's better cos the travel of the wastegate is not affected this way like when the rod is shortened and this means smoother boost build up
Discovery Td5 (2000), manual, tuned
Master
SubscriberSo, just leave the factory wastegate rod length and turn the boost knob up till you reach your desired boost level?
Can you run it just from the inter cooler pipe and by pass the boost solenoid, and connect it up to the waste gate?
YarnMaster
You can but then you dont have active boost controll which is better, you'd just downgrade the D2 with such mod, OffTrack's research is relevant for that: Wastegate Modulator Control | DiscoTD5.com
Discovery Td5 (2000), manual, tuned
TopicToaster
SupporterI can't understand how a manual controller would help in any way if it's connected between boost solenoid and wastegate.
Even if the manual controller is turned up to allow full boost pressure, that pressure is still limited by the amount that the boost solenoid allows.
The only control you'd then have access too is to turn down the boost if you needed that.
Arthur.
All these discos are giving me a heart attack!
'99 D1 300Tdi Auto ( now sold :( )
'03 D2 Td5 Auto
'03 D2a Td5 Auto
Master
SubscriberTrue, but cant you bypass the boost solenoid and just have it connected to the metal pipe going into the intercooler and the wastegate, so the boost solenoid doesn't have nothing to do with it.
YarnMaster
What the WGM does when it is operating is reduce the pressure at the wastegate actuator by blending boost pressure and intake pressure.
At 40% you get maximum reduction, then as the modulation percentage decrease the amount of pressure at the actuator increases.
So plumbing the manual controller in after the modulator will still control the maximum boost.
Basically the WGM is part of a electronic boost controller setup. Main issue is that on-one had worked out how to modify it correctly.
I posted up the details of how the maps operate a couple of days ago, and I had a Russian friend email me yesterday saying he had successfully altered the maps using that information to give 1.5bar boost without touching the actuator rod.
YarnMaster
A manual boost controller plumbed between the modulator and actuator will over-ride the effect of the WGM, so doesn't make much difference if you bypass or not.Originally Posted by sierrafery
The stock maps control the WGM so that maximum target boost is 1.19 bar @ 4000rpm. The target boost varies based on engine load (IQ mg/fire and RPM).
TargetBoost.jpg
If boost is above the target boost, then the WGM duty is reduced allowing more boost to reach the actuator, allowing the wastegate to open to control boost. If you insert a manual controller that operates by restricting boost from reaching the actuator until boost pressure reaches 1.4bar of example. In this case the modulator has no effect on maximum boost.
Anyway by modifying the target boost table and the WGM duty ratio bias it's possible to accurately control the boost level set by the stock WGM. It's early days with this mod but it opens the ability to do some quite advanced electronic boost control with only the stock hardware.
If you check out some of the MOTEC electronic boost control videos on YouTube they discuss a 3 way solenoid setup (at 7.58) which is identical to that used on the D2 Td5's.
Note the positive comments made about this type of setup.
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