The charge pipeping if exsesive in size or length can hurt spool up time (ask me how I know :roll: )
hi im quite new here, anyway this is an awesome post! far more detailed thank that link.im just wondering is it possible to put a TDI head on the TD engines?? Iv read somewhere that they are more efficient in terms of temperature of combustion? if it is possible (i maybe sounding dumb without relising), is there any power gains from such a conversion?? Iv just been thinking why the TDi's are 90bhp whereas my TD is 75bhp (93 jetta).also, how much do the injectors of the TDi compare to the TD. Im looking at injector upgrades as mine are packing in!cheers for any info!
You can't use an IDI pump on a DI. The IDI pump won't make enough pressure to make the DI run/run smoothly. There are people that have built mech. pumps for DI's. There are a small number of DI's that run a mech. pump and a even smaller number that are available it NA. I built a mech. pump for my TDI using parts from a Land Rover 300TDI, and a VW TDI.
The real test of an IC's effectiveness is to measure the air temperatures pre-and post-intercooler. If the IC is lowereing the charge air temp, you should be able to increase fueling, resulting in more power and faster boost build. If your car isn't smoking like a steam train going up a grade with the IC out of the loop, then you were't fueling to max anyway...
Ok lets start with the max fuel screw as even with out extra boost these motors can still definatly use extra fuel, so for this mod just break off the coller (either remove completly form pump and then remove or find the seam and pry it off with a well pointed flat blade screw driver . . . . . Note the location of the wheel, mark it, and count any turns for reference. Remember: Star wheel down=less spring resistance=increased fuel delivery rate.
What this didn't cover as I had already covered it during this persons build up are the upfront costs. **These things must be in place b4 any thing you start to mod. 1. ***Exhaust from turbo back at lest 2.25" mandrel bent 2.5" is ideal, 3" is doable but takes alot more fabing. 2. Gauges. egt gauge, boost gauge, are the minimum, if you are going to do the govener mod then add a tach to that.