Hi guys. The big day for fitting the taper throttle bodies is now fast approaching, and I have a few more questions. Firstly concerning the setting up and balancing of them. According to SBD you close all the throttles and set the throttle pot to 0.328V. I got SBD to build up the bodies for me and I think they may have already done this as the throttles look closed and the pot is tight. Next you adjust the throttle stop until you get a reading of 0.374V which I assume correspond to the idling speed. You are then supposed to start the engine and balance the butterflies. I have a vaccum gauge but am not sure exactly how to do this. Do you have to balance the buttteflies to 5 kg/h at a specific rpm or at idling speed. Also do you do the master body (i.e. the one with the throttle stop) first and the the others to match and do you use the throttle stop screw or the grub screw to adjust the master. Also on the SBD instructions it says "every time the throttles are adjusted the throttle pot needs adjusting to the correct voltage" What does this mean. does it mean adjust the throttle stop screw until the reading is 0.374, or move the pot itself to get this voltage once the bodies are balanced.
Second question concerns the lambda sensor. I originally thought my standard corsa lambda sensor would be no use with the MBE ECU as it says in the SBD Grp N instructions that the corsa sensor doesn't work. However when I spoke to SBD they said it would work (only at idle) if wired up correctly. Does anyone know what pins on the MBE loom go to what colours on the lambda sensor. There are 4 wires on each, but what goes to what. I can't see any colours on the MBE loom ( and I don't want to cut the loom to find out!), but the lambda multiplug is marked 1, 2, 3, 4 and has 4 bare terminals of the far end. Also does anyone know how to activate the lambda in easymap 5, as SBD said it came disabled to allow balancing.
Sorry for the long post guys, but I am sure the engine boffins with have plenty to get their teeth into here.
allo alan, now balancing the TBs is easy enough, 1st make sure the fuel pressure is right, and screw down the throttle stop adjusting screw till the TPS reads 0.374v and start up the engine. after that hurdle(!) then let it warm up and pop the synchrometer into all the trumpets and record the values. now note the higest value and undo the other air bypass screws and let the grub screw out till all the pots read the same air intake.
the 4 wire lambdas are the heated ones, dunno if the standard one is heated, never seen one
enabling the lambda is easy enough as its just a drop down menu function, use the get data function to see all the options available to you mate.
If you have spent all that money on TB's and MBE,it would be ashame to use the corsa lamda,id go for the sbd wide band lamda.Expensive but worth it.
Let us all know how you go on,as i am also considering SBD TB's on my corsa gsi
the actual story is that steve has been trying to develop a cheaper alternative to the wide band sensors he uses (over 1000 quid i think you will agree noone will buy them just to tinker!)
so he's been messing with various sensors and controllers to work with the MBEs. fine and dandy if thats all you are gonna do, but this guy runs a business and i doubt he has much time to devote to development in-house.
Cheers guys, I think I will just leave the lambda sensor for the moment as I don't want to connect anything to the MBE loom unless I am absolutely sure what I am doing. As Gary said I will get the engine running first and then worry about that later. SBD corsa, what lambda sensor are you running. I heard about your problems with interpro and I am keen to set up the throttle bodies myself if at all possible as I don't want to give it to a garage who may not do it properly as happened to you. Have you got anything resolved yet as it was a disgrace the way you were treated. Have you got any tips yourself or any problems you found on set up.