David P Posted September 16, 2011 Share Posted September 16, 2011 As previous post, or air leaking into induction vacuum. Quote Link to comment Share on other sites More sharing options...
Noz Posted September 16, 2011 Share Posted September 16, 2011 brenden, is it worth going back to old set up, old TB and change the pulley back over to see if its still running high. Quote Link to comment Share on other sites More sharing options...
barneybrendan Posted September 16, 2011 Author Share Posted September 16, 2011 As previous post, or air leaking into induction vacuum. will double check all the pipes, brenden, is it worth going back to old set up, old TB and change the pulley back over to see if its still running high. Im going o put the throttle body back on and blow into it again,but leave the pulley on. Quote Link to comment Share on other sites More sharing options...
Noz Posted September 16, 2011 Share Posted September 16, 2011 whas was the advantage to the new TB, more air flow as it was larger? Quote Link to comment Share on other sites More sharing options...
barneybrendan Posted September 16, 2011 Author Share Posted September 16, 2011 That was the plan along with better response ect and to quieten it down., but im not sure now as to wether to just stick with the original plan.I seem to be spending money on stuff to just try it out which is getting rather anoying now.£20 here and there soon turns into £100 here and there and so on.fitting tha na throttle body is an easy swap , Quote Link to comment Share on other sites More sharing options...
Noz Posted September 16, 2011 Share Posted September 16, 2011 hopefully with the old NA TB your getting it running right mate. can take me out in it then Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted September 16, 2011 Share Posted September 16, 2011 the merc has an electronic valve which is prone to leaking and no good if you want to increase the boost.Looking on the merc forums it seems it is removed and a vacum operated one fitted. My head is a bit fried ,the car was running fine on the dyno with the old setup.the only real difference is the v8 throttle body before the charger and the smaller pulley.With the small pulley obviously my boost has increased and the charger will be spinning faster on tickover,but would that increase the airflow past the bypass valve.What other reason would there be for the tickover to be so high. Can I trouble you for a link to any Mercedes forums where they discuss these mods please Brendan? Ta! Quote Link to comment Share on other sites More sharing options...
barneybrendan Posted September 16, 2011 Author Share Posted September 16, 2011 Just fitted the na throttle body and it blew the intercooler pipe off.I need to give the bypass valve a feed from behind the throttlebody again as it didnt open oops.revs were at 200rpm before the pipe blew off.going to redo the vacum pipe now and try again ,but it seems the initial problem is either the v8 throttle body or the modified na one at the moment. Quote Link to comment Share on other sites More sharing options...
barneybrendan Posted September 16, 2011 Author Share Posted September 16, 2011 Can I trouble you for a link to any Mercedes forums where they discuss these mods please Brendan? Ta! i havnt saved anything but i will try and back track to see what i went on. Quote Link to comment Share on other sites More sharing options...
barneybrendan Posted September 16, 2011 Author Share Posted September 16, 2011 Right i have the na throttlebody back on and it is ticking over ok and revving normaly.Even with the bypass valve open and the intercooler pipe off there is still a fair bit of air pushing out the end.When i open the throttle the bypass valve shuts off as it should if i rev it quickly the revs drop instantly and the bypass valve opens instantly.going to reconect the intercooler pipe now to see what happens. Quote Link to comment Share on other sites More sharing options...
Noz Posted September 16, 2011 Share Posted September 16, 2011 fingers crossed! Quote Link to comment Share on other sites More sharing options...
barneybrendan Posted September 16, 2011 Author Share Posted September 16, 2011 This is driving me mad now.check out the video again,the charger blowing into the na throttlebody works fine ,just noisey. been reading up a bit more and if the bypass valve is not venting enough then the air will go back into the charger and bang dead charger.I am now wondering if this is what happend the first time when the charger let go good and proper. Quote Link to comment Share on other sites More sharing options...
David P Posted September 16, 2011 Share Posted September 16, 2011 That first charger was almost dead before you fitted it. I will pm you my number, it might be easier than all this button pressing. Quote Link to comment Share on other sites More sharing options...
barneybrendan Posted September 16, 2011 Author Share Posted September 16, 2011 (edited) cheeers daave,phingeeers crossed iam back on track now. Edited September 16, 2011 by barneybrendan (see edit history) Quote Link to comment Share on other sites More sharing options...
barneybrendan Posted September 27, 2011 Author Share Posted September 27, 2011 i have just stripped the charger back down as it still didnt feel right.the edges of the impellers have slight ware and the casing has minor scoring.I cant understand what is wrong as the bearings are intact and still have grease in them,Very confused .I now have the old case fitted so i can make the intake elbow without anything falling into the charger. Quote Link to comment Share on other sites More sharing options...
David P Posted September 27, 2011 Share Posted September 27, 2011 (edited) As per telephone conversation. The configuration you had before with the ICV mounted after the charger was starving the charger of cool air during tick-over. If you had left it ticking over for any time, the charger would have been breathing the same recirculated air and soon get very hot. Maybe it became hot enough to expand enough to do that and upset the front nylon thingy too? Edited September 27, 2011 by David P (see edit history) Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted September 27, 2011 Share Posted September 27, 2011 There is info on this phenomenon in one of the links you sent me, or maybe a branch off one of the links. Sounds very likely to me. Quote Link to comment Share on other sites More sharing options...
David P Posted September 27, 2011 Share Posted September 27, 2011 (edited) I haven't seen that, to me it's basic plumbing. With the engine drawing all the cool ICV fed air, the charger whacks up the air temp then sucks it back around though the open bypass valve then whacks it up some morte, etc. Edited September 27, 2011 by David P (see edit history) Quote Link to comment Share on other sites More sharing options...
barneybrendan Posted September 27, 2011 Author Share Posted September 27, 2011 (edited) Im not going to dwell on it too much,just suck it and see.If another charger goes bang then so be it look at it this way i will have plenty of spare snouts. Edited September 27, 2011 by barneybrendan (see edit history) Quote Link to comment Share on other sites More sharing options...
David P Posted September 28, 2011 Share Posted September 28, 2011 (edited) Once it has some cool suck to blow, with a bit of luck, Bob will be your uncle. Edited September 28, 2011 by David P (see edit history) Quote Link to comment Share on other sites More sharing options...
barneybrendan Posted September 29, 2011 Author Share Posted September 29, 2011 (edited) The intake has now been modified so only one straight rubber coupler is in line.What a damn nightmare that was.The mk3 tt ICV is now fitted just after the v8 throttle body.Things are now extremly tight ,and the plenum and runners need to be removed to get at everything.Going to refit the charger tomorrow as i still have the knackerd case bolted in place so i didnt get any splatter in the charger. Edited September 29, 2011 by barneybrendan (see edit history) Quote Link to comment Share on other sites More sharing options...
David P Posted September 29, 2011 Share Posted September 29, 2011 Barney, That's looking better, it will run cooler that way and from looking at those pics, I can tell you that your vacuum plumbing is causing your other induction fystery. Those little hoses are venting air to each other at different throttle positions close to tick-over, blank each one off separately. Quote Link to comment Share on other sites More sharing options...
barneybrendan Posted September 29, 2011 Author Share Posted September 29, 2011 Barney, That's looking better, it will run cooler that way and from looking at those pics, I can tell you that your vacuum plumbing is causing your other induction fystery. Those little hoses are venting air to each other at different throttle positions close to tick-over, blank each one off separately.[/quote I take it you are on about the ones on the throttle body Quote Link to comment Share on other sites More sharing options...
David P Posted September 29, 2011 Share Posted September 29, 2011 Quote Link to comment Share on other sites More sharing options...
barneybrendan Posted September 30, 2011 Author Share Posted September 30, 2011 Cheers im on it. Quote Link to comment Share on other sites More sharing options...
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