Reply With QuoteYou must have a dial indicator! That's really the only safe and reliable way of getting the timing right.Originally Posted by gldgti
Did you also fit extractors?- 2" straight exhaust from the bottom of the dual downpipe back
Got any pics of this?- enlarged airbox intake to 80mm with cold air intake and open grille
Don't understand the link between your fuel screw (max. fuel control screw?) and your accelerator cable??- wound in the fuel screw as far as i could accomodate with my stretched accellerator cable to increase fuel at WOT
I haven't done any mods as I'm a "keep it original" sort of guy. But...Anything that improves gas flow both in and out has to be good. Increasing air density (and therefore oxygen content) by drawing cold air is also good. Every diesel (all makes) that I have bought second hand has had the problem of not getting full throttle. This is always the first place I check Usually it's just cable adjustment, but sometimes (depending on the make) it's adjustment or wear on the pump throttle shaft or linkages themselves. With diesels, a fraction of a mm can make a huge difference. As far as the maximum fuel device is concerned, it's a case of compromise. How much smoke can you and the boys in blue tolerate? Wind the screw until nobody complains.Now, i know for a fact that the car goes a lot better, but i've always pondered what kind of gains i've really got. I mean, is it a couple of hp here and there, maybe a little torque.... i know noone can actually tell me unless you are willing to pay for a dyno run (haha) but i really just want to hear your theories. the never ending quest for the lean, clean diesel powermachine is neverending for me, but its a fun underaking. what mods have you guys done?
In the US and Canada there are fuel injection shops who pull Golf injection pumps to bits and rebuild them for maximum efficiency. I guess what they are doing is increasing fuel delivery because you can't get something for nothing! They charge to Earth, too. $1k AU or there abouts. You can't really do much with valves and combustion chambers (no chambers!) but you can polish and port the head. I haven't any figures for performance improvement for this but it's got to help. Injectors should be kept in optimum condition. You can get genuine Bosch nozzles very cheaply if you know where and contrary to what the fuel injection shops will tell you, you can fit them youself if you know what you're doing. As timing belts stretch and the teeth wear they incrementally retard both valve and injection timing. Valve timing isn't so bad, but even a fraction of a degree of injection delay can make a huge difference, so replace the belt often. (You must have a dial gauge?? Will you lend it out?)
A lot of what I just wrote has nothing to do with "tuning", I know. But a good place to start is to get the basics right. No point in polishing and porting etc. if the engine isn't basically doing what it should.
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