I have a VW Beetle Volksrod running a drawthrough turbo setup on a flat 4 air cooled.
Now, I don't want to debate the actual set up, it is what it is and it's staying put. But, I am having issues with it running. I'm aware of the issues normally associated with this method (a bit hesitant, a bit of a handful etc). However, I can't get it to rev cleanly at all.
It will idle (after a bit of nagging to start), but when I open the throttle it bogs down badly. Lots of backfiring, lots of firing through the carb (I do have a video somewhere but no idea how to upload it?), and the revs just wont build. I can get them to build a bit by bipping the throttle loads though.
I have seen videos of this very engine running and being used in a car before, so I know that it does run and work, but I have obviously done something silly somewhere.
I have a delorto side draft (40) feeding into a garret turbo, the outlet of which is pointing downwards to a T which then branches off either way to the 4 intakes on the heads.
Ignition is a 009 with the advance limited to 28* with a little lock off screw (I modified it myself). I've checked checked and rechecked for vac leaks (and about to check again!), but short of that can anyone suggest anywhere else to look?
I have found that when I turn the dizzy anti clockwise, the idle increases and the backfiring etc is not as bad.
I am going to check the pump jets and diaphragm tomorrow, perhaps the backfiring through the carb has ruptured it?
Strip and clean the carb is another thing on the list (thinking that perhaps it's just not fuelling properly).
I would try and set the timing but I can't do anything other than static timing as obviously I can't get the revs to build, and my timing light is broken Hahaha!
The only thing I can really think of is that something is causing it to lean out when I open the throttle. I used to think that perhaps the carb is chucking too much fuel in it, and that it was pooling in the turbo. I moved the turbo closer to the engine and clocked the outlet 45* (it used to sit horizontal which meant that the air and fuel had to get through two right angles before getting to the T-branch on the intake), but it runs worse since doing this which makes me think that I've not resolved the original issue of poppin through carb and not running great, and intruduced more issues lol!
Anyone got any personal experience with these systems? I will add pics later on when I work out how to do it.
Thanks in advance!