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Originally Posted by luke85
....low compression C20LET vauxhall engine
Single core chargecooler
Hybrid turbo
2D water injection
heat range 7 NGK irridium plugs
ported and polished head
4x470cc/min injectors
fuelling set by adjustable regulator and wideband to 11.5
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1. Low compression as in low-compression pistons? If so, how low, 8:1 would be nice
2. chargecooler will heatsoak early and be of limited use in a long run. Air/air intercoolers have an edge here. I'd go for a large water tank for the chargecooler and a faster pump if possible.
3. Hybrid turbo helps a bit, although you'd need a much larger exh A/R to see a lot of difference at prolonged full throttle, 0.6 or over ideally...
4. W.I. can help a LOT here. Best to configure it to inject at low boost, so you get more water in there during the long run. Also make sure you don't run out of water, normal water tanks don't last too long if you don't let off the throttle
Good luck, the LET is a robust engine, especially with W.I. and if it is not allowed to detonate at all.
I'd also consider injecting pre-turbo as well, it works wonders if your intercooling isn't that good.