GTR PrYdE wrote:Either way you're making good power. What injector size are you running?
NISMO 555cc Injectors
nelson8708 wrote:First i have read that you have to run a special or external pump because a electric arc from a internal pump such as a walbro 255 could cause an explosion?
I heard this as well, but I emailed multiple companies that sell or perform ethanol conversions and none of them have ever had problems with fires from the fuel pump. The most common problem with the conversion is that the ethanol cleans all of the crap out of the gas tank and can plug up the sock on the fuel pump and plug up the fuel filter. Both easily fixed.
nelson8708 wrote:Second:When tuning with a gas calibrated wideband what afr would you tune for. I heard 9:1 at idle and 7:1 under boost but i have also hear 12:1 idle and 9:1 under boost. I want to figure out the equvilant to 14.7:1 gas for E85 and what 11:1 in gas would be for E85. This way i can write a tune to be on the safe side. A little bit on the rich side under boost.
Stoich. for STRAIGHT Ethanol is 9:1 vs. 14.7:1 for gasoline. The e-85, especially the winter blend, tends to be leaner than this. As far as idle AFR's go, don't tune for a particular number. I tune my engines to run as lean at idle as they can tolerate and still idle well. Any extra fuel is a waste.
Under boost 7:1 is about right, but once again, you should be tuning on the dyno, and tune for whatever makes the best power. If you start tuning a car based on what it's SUPPOSED to be at, you'll be disappointed. The beauty of the E-85 is it's octane will let you run leaner AFR's w/o det. If the car makes better power and doesn't det. at what is supposed to lean, who cares?
nelson8708 wrote:Third:Around what hp level or boost level would i have to start to retard timing with e-85. I read it is good up to about 7-10psi.
I start with 1° retard per 1lb of boost. If I don't get any det. then I start to add timing back in until it does, then I pull out 2°. IMHO, timing is the hardest part of an engine to tune and is also the most important. You'll just have to play with it and see what makes power. Remember though that more advance isn't always better. If you add timing and it doesn't make power, then go back to the previous timing advance. Anything more just starts to wear the internals.
WDRacing wrote:How do you like the SDS? I helped a friend tune his on a 3 Rotor over in JDM Land. But it was tuned with a EGT and narrow band. No knock sensor, no real AFRs. It was pretty user friendly though, I have the LM1 which is compatible with the SDS so you can see the AFR's for every rpm etc.
I LOVE it. I'm tuning a haltech for a local shop right now and I hate it. It's awesome if you have a gazillion different things that you want to control, but IMHO, it's overkill for most street cars.
WDRacing wrote:When you're talking about tuning the timing, do you mean total timing and then retard with the MAF or MAP? Can the SDS retard .5 degree's per psi or is always a full degree?
The SDS has 3 settings that effect timing. Base timing as set per each RPM point, MAP timing that either adds or subtracts timing from the RPM point's timing, and then knock timing which subtracts timing under knock (obviously). For tuning purposes the knock timing is irrelivent as it's a safety measure, so that just leaves RPM and MAP. I have about 10° from 500-1000 RPM. Then it increase to about 32° at 2750-3000 RPM (I don't remember which off the top of my head) From there the MAP either adds timing in the vac ranges to help fuel economy, or retards timing in the boost ranges to prevent det.
Timing can only be adjusted in 1° increments.
WDRacing wrote:Did you use the handy little fuel mixture knob thing? We had to because when we started to tune his car, he was running 100lb injectors and had no idea how much fuel to add for a base map. The enrichment knob totally helped with startup.
That knob is awesome. It helps with startup and tuning. It makes it very easy to make fuel changes and see the effect on the dyno and then tune accordingly. Yet another reason the SDS is so easy to tune.
WDRacing wrote:What size injectors are you running?WD
NISMO 555cc CA18DET specific injectors.