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sdminus
19-11-2005, 06:11 PM
What percentage water to fuel are people using for a twin turbo application twin rotary. atm im using 5.9gph with 36gph of fuel. I am gonna be increasing my fueling to 44gph. What do you think my water percentage should be.

Scott

Richard L
28-11-2005, 08:15 PM
We normally go for between 10-15% of water/fuel by mass, minmise any blow-by to the sump.

Fuel has a density of 80% of water, but it is OK to go by volume, it is useful to compensate the pressure offset in the manifold.

Richard

Could we have more details of the set uip - pictures will be useful.

sdminus
18-12-2005, 07:42 PM
Cool thanks. What details would you need.

Scott

Richard L
18-12-2005, 10:10 PM
I think the Rx7 have primary and secondary injectors, what are their sizes?

sdminus
18-12-2005, 10:22 PM
Im am going to have 2 x 850cc primary injectors and 2 x secondary injectors

Scott

Richard L
20-12-2005, 10:52 AM
YOu are capable of deliverying 3400cc of fiel per min. a 1mm just will about giving to 10% of w/f ratio. If you add a priming pump - you can stretch the ratio to 15%+.

How stressful is your tune (engine wise)?

sdminus
20-12-2005, 10:01 PM
Cool. That was what i was thinking.

My engine is not mapped yet. still waiting for bits to turn up at the mo. Gonna tune for the water and try and gain a few ponies tho the timing.

How does the ratio alter when adding alch if at all.

Scott