Air fuel ratio and ignition timing.
#1
Air fuel ratio and ignition timing.
I am tuning an Alpha and a Beta engines in an almost stock setup (CR to 11 to 1 and VP103 fuel). I am looking for the best power a/r and ignition timing table. Any experience on these parameters in order to reduce the tuning time?
#4
One of the guys here is actually the agent for PerfectPower, it's SCCA Elantra if I'm not mistaken, maybe you ought to drop him a PM and ask him about those, if my memory's still not that bad he should be THE guy to ask about this!
Good luck man.
Good luck man.
#5
At 11:1 compression with a stock head, you probably still don't need VP103 to get it running right IF you are indeed running a standalone. Of course, with all the proper supporting parts, it can't hurt
Suggested map:
On engine RPM maps above 2500, I'd suggest about 41 degrees of advance from 30+ inches of vacuum to about 10 inches of vacuum, and then ramp it down to around 35 degrees of advance at 0 vacuum.
At the 2500 point and below, I'd keep the advance down to about 35 degrees on the part-throttle (high vacuum) parts and have it ramp down to about 28 degrees at 0 vacuum.
Cranking map should be around 4 degrees of advance.
If you're running VP103, that should at least work. You may be able to get more, but not sure how much more. Of course your mileage may vary, depending on intake temperature heat, cam profile, piston design, blah blah etc you get the idea. Basically, don't cry if it pings wink
Suggested map:
On engine RPM maps above 2500, I'd suggest about 41 degrees of advance from 30+ inches of vacuum to about 10 inches of vacuum, and then ramp it down to around 35 degrees of advance at 0 vacuum.
At the 2500 point and below, I'd keep the advance down to about 35 degrees on the part-throttle (high vacuum) parts and have it ramp down to about 28 degrees at 0 vacuum.
Cranking map should be around 4 degrees of advance.
If you're running VP103, that should at least work. You may be able to get more, but not sure how much more. Of course your mileage may vary, depending on intake temperature heat, cam profile, piston design, blah blah etc you get the idea. Basically, don't cry if it pings wink
#7
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Posts: n/a
Hey mario, Give me the exact engine specs of each engine and I will contact Perfect power. They can give me a basic map for that setup. Well they should anyway. Glad to hear you are using the SMT-5 smile.gif Best way to tune those SMT-5's though would be to put it up on a dyno. You should get it tuned in 3 runs. That is the advantage of the graphs the the SMT-5 software has. It will tell you where its working and what not.
#8
I also represent Perfect Power in Costa Rica. Unfortunately they do not have the tunning library nor the maps for the new Kefico ECU´s. There is no dyno around so I have to do it on the road. It is not that hard on the fuel side using O2 sensor but the ignition timing is a whole different thing, changes can be negligible, I intend to take advantage of the knock sensor and advance it just before I get a reading from the sensor. Perfect Power is actually waiting for my info to include it. Our system is MAP so there is also a dif there. Thanks for your interest.
#10
I think the US models are MAFS. Aren´t they? You also got dif. emission control stuff we do not need. I know you can set SMT-5 to either MAP or MAFS. When I am done I will send them to you. It could help as a starting point.