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400WHP Renesis on pump gas
How?
W/M injection with custom two stage rpm based setup (Snow Performance kit)
Brettspeed manifold
G30-660 0.83 Turbo
Built engine with low(ish) 9.7:1 CR rotors
That's the plan at this stage .......
Failsafe strategies :
1/ AEM failsafe gauge set to cut boost if AFR goes over presets.
2/ Pressure switch ... either just turns on green light OR prevents EBC solenoid operation if no pressure in line
3/ Boost cut at preset rpm (7500 ish)
For reference: AI Safeguards - RX7Club.com - Mazda RX7 Forum
Great plan. I have a plan too. (just putting it out there)
I plan to win the biggest lottery ever in history.
Getting a body transplant. Hey,I can afford the research.
I'm thinking a body like the "Govenater" but with out the beard he has today.
(and without the heart implant.)That's a start for now. Does anyone else out there
have any "plan", if so let's hear them..
Oh Yay, The car runs just fine as it sits .............
Great plan. I have a plan too. (just putting it out there)
I plan to win the biggest lottery ever in history.
Getting a body transplant. Hey,I can afford the research.
I'm thinking a body like the "Govenater" but with out the beard he has today.
(and without the heart implant.)That's a start for now. Does anyone else out there
have any "plan", if so let's hear them..
Oh Yay, The car runs just fine as it sits .............
Sounds like an arduino to handle wmi+failsafes would be handy. The flexibility in control logic it offers is unbeatable. You want it to sing "take my breath away" when boost needs to be cut... you got it.
Just spent a couple of days bench testing the W/M system (again) to get familiar with it's operation etc.
Some things I've learned...
*Don't trust that the nozzles are 'ready to go'. Noticed they come with filters not screwed tight which upsets output. Also one came with corrosion evident at the nozzle tip , obviously it had had water through it and not been cleaned out.
*Don't trust the output on the nozzles as the actual output ...test it.
*When testing with a car battery ... have it on charge constantly. As voltage drops so does output.
*Check valves will prevent siphoning and minimise 'overspray'. Important for me as I'll be putting both nozzles post throttle where they will see full engine vacuum.
*Solenoid valve will also prevent siphoning but if mounted away from the nozzle ...a check valve is also worthwhile to minimise 'overspray' and keep some pressure in the line in readiness for next spray.
*They don't tell you this, but the pumps (sureflo) have an adjustment mechanism which on it's lowest setting produces flows close to what the nozzles are specified at. Adjusted to its max. setting and flow is nearly 1.7x the min setting. This means you can get some leeway on nozzle sizing.
*IMO ...... go for smaller nozzles that you can run at higher pressure so that you get the best atomisation.
*The controller that comes with the Snow Performance kit supposedly adjusts flow according to boost but this isn't how you might think.
See below two graphs of output vs boost pressure. In the top one I set start at 2 psi and max flow at 30PSI . You would think youd get progressive linear flow all the way to 30psi ... not so. Note how you get close to max flow at around 14psi .
The bottom chart I set start at 2 psi and max flow at 14psi . You get close to actual max flow at around 7 psi !
This is valuable information as this is a street car and I don't want to be drowning the engine at lower than max boost settings.
but great care has to be used with above, the frequency is to low and can results in one cycle receiving 100% of open time, and other 2 ones 0% or mix off.. (or any alternative)
can be significantly fought with high duty cycle on the solenoid valve when the variability between cycles is very low.
Plotted bellow is PWM (time of injection) in blue, VS in orange cycles (one than another oscillating)
@Brettus when the flow is adjusted by pressure it is very close to (P2/P1)^0.5 (or even less like 0.4) .. ie for double the flow you need at least 4 times the pressure.
I would say you need water as a function of MAF not MAP (as map is same betwen 3000 to 8000 rpm, while MAF is >> double) .. but it is impossible to match it with PWM.
05-21-2024, 05:58 PM
