The XW had a interesting time at the drags last night,
1st run: Was going to be a easy run to get the feel of the new mods that had been made since last year, Different engine mods (CHI alloy heads and Comp solid came) and some M/T street radials had been added.
Got a good launch and went for full throttle just before the 60ft mark to fire the NOS and the engine felt like it had no fuel pressure, Got off the throttle and gave it another squirt, Power for a few seconds then nothing.
Back to the pits thinking 'oh maybe I didn't purge the NOS properly' Nope that was all good.
2nd Run: Try a run with out NOS, Same problem no power at full throttle, Started to think that maybe with the extra G's from the launch that I was having LPG convertor issues and this was confirmed after a bit of deliberation.
3rd Run: On the NOS again but with a bigger LPG jet which would supply more fuel to the inlet manifold which was bypassed from the LPG convertor.
Same fuel starvation issues but getting a little bit better, Was able to give it a full throttle run through the 1000' mark and managed to record my highest MPH ever.
13.2 at 110MPH.
4th Run: Ok We are on track here, Put a bigger LPG enrichment jet in and gave it a big launch from the line, JEEZ the bloody thing went like an absoloute demon and the motor was onsong like it had never gone before then BANG!!!!!! as the diff blew it's self out to lunch right on the 60' mark and I coasted thrrough the traps.
I am going to get myself a 9inch diff if this experiment is going to go any faster and pull the LPG convertors off and have a bit of look inside them to find the issues. The combination of NOS and LPG has taken a bit of getting used to but the main issues with LPG are getting enough feed to the motor via the safety margins that are built into LPG systems these days.