BLKCRX
10-08-2005, 02:02 PM
Tuning a car electronically, there is in particular 3 or 4 very important things to tune a car electronically for, those being when looking at EFI tuning.
H D and B Honda engines = Fuel, Ignition and Vtec cross over point (plus Secondary intake runner on some engines)
K Honda engines = Fuel, Ignition, Vtec Cross over point and Cam Angle
Sure there are other factors that effect drivability and slight power increases, such as fuel trim’s, injector sizing, overall fuel trim, cranking fuel trim, throttle tip in trim, cylinder fuel trim, cold start post fuel adjustment, rev limits, launch control, full throttle shift, vtec lower and upper boundary’s, idle speed, idle vs coolend temperature, idle control, calibrating map sensors, close loop, open loop, target narrow and target wide band voltages, air temp compensation, water temp compensation, gear compensation, and believe me the list of drive ability tuning factors goes on and on, these factors 90% of the time don’t effect maximum power, but are very much the factors which separate a good tune from a bad tune, drivability, fuel economy, response. Hardly any of these settings can be set accurately set by spending 1 or 2 hours on the dyno, you need to spend hours upon hours or even days on the road, in real life situations calibrating each and every engine for the above dynamics for all conditions, and know the product and the engine like the back of your hand. Knowledge is everything.
So what’s the point of all of this, the basic tuning parameters Fuel, Ignition and Vtec, are the most important aspects of tuning, BUT to tune these factors correctly your engine MUST be mechanical tuned optimally and perfectly!!! Your engine modifications must match each other in every possible way especially when your chasing high rpm high power and starching for every last KW the combination of parts must be perfect. The smallest things like spark plugs/gaps, intake length can affect an engine output dramatically. Not to mention major factors like engine health, compression, and clearances etc.
If an engine is not making power after 9000rpm and is “curling” over dramatically like lots of engines do, then I would question the build combination, or the mechanically tuned parameters, such as valve clearance, cam overlap etc especially if the engine is meant to make power till 10,000rpm. Not even the best tuner in the world can turn a poorly built and designed engine into something specially. The combination has to be correct to begin with.
Summary, build it perfectly, tune it perfectly and the results will be satisfying, skimp on any area and the results could be disappointing. You can’t turn water into wine, unless your God.
Regards James
H D and B Honda engines = Fuel, Ignition and Vtec cross over point (plus Secondary intake runner on some engines)
K Honda engines = Fuel, Ignition, Vtec Cross over point and Cam Angle
Sure there are other factors that effect drivability and slight power increases, such as fuel trim’s, injector sizing, overall fuel trim, cranking fuel trim, throttle tip in trim, cylinder fuel trim, cold start post fuel adjustment, rev limits, launch control, full throttle shift, vtec lower and upper boundary’s, idle speed, idle vs coolend temperature, idle control, calibrating map sensors, close loop, open loop, target narrow and target wide band voltages, air temp compensation, water temp compensation, gear compensation, and believe me the list of drive ability tuning factors goes on and on, these factors 90% of the time don’t effect maximum power, but are very much the factors which separate a good tune from a bad tune, drivability, fuel economy, response. Hardly any of these settings can be set accurately set by spending 1 or 2 hours on the dyno, you need to spend hours upon hours or even days on the road, in real life situations calibrating each and every engine for the above dynamics for all conditions, and know the product and the engine like the back of your hand. Knowledge is everything.
So what’s the point of all of this, the basic tuning parameters Fuel, Ignition and Vtec, are the most important aspects of tuning, BUT to tune these factors correctly your engine MUST be mechanical tuned optimally and perfectly!!! Your engine modifications must match each other in every possible way especially when your chasing high rpm high power and starching for every last KW the combination of parts must be perfect. The smallest things like spark plugs/gaps, intake length can affect an engine output dramatically. Not to mention major factors like engine health, compression, and clearances etc.
If an engine is not making power after 9000rpm and is “curling” over dramatically like lots of engines do, then I would question the build combination, or the mechanically tuned parameters, such as valve clearance, cam overlap etc especially if the engine is meant to make power till 10,000rpm. Not even the best tuner in the world can turn a poorly built and designed engine into something specially. The combination has to be correct to begin with.
Summary, build it perfectly, tune it perfectly and the results will be satisfying, skimp on any area and the results could be disappointing. You can’t turn water into wine, unless your God.
Regards James