I have a 1994 saloon 4 door S2 with ABY engine.
Is there a easy, or better explaining, a mechanical way to advance the ignition timing by about 6 degrees, without remaping ECU?
I live in Brazil and here we have 3 main fuels at gas stations.
Regular 88 octane gasoline at about US$1,00 per litre, wich doesnt perform well in S2.
Premium 98 octane gasoline at about U$1,80 per litre, wich obtain full performance from car, but is very expensive to maintain tehe tank fullfilled.
Alchool (not methanol), wich have a octane rating equivalence of 104 octane, very cheap, about US$0,50 per litre, and easily found in any gas station.
All vehicles with aftermarket turbochargers here in Brazil uses this alchool as fuel, but to be effective, the ignition timing should be advanced to about 15 degrees at idle and about 28~30 degrees at wot in high RPMs to take full advantage of fuel. In moderate boost levels, until 15 psi os boost, 6 degrees of advance in entire timing map is effective to have a close to ideal timing map using alchool as fuel.
On same boost level, alchool gives about 15% more power than gasoline, and need a higher compression ratio in aspirated engines, but in gasoline original turbocharged engines like ABY, it give us a possibility to increase the boost level about 30% without detonation problems, and giving us the correspondent gain in power.
Alchool have a lower calorific power than gasoline for same mass, a increase of 30~35% in injected fuel is necessary. To increase the fuel injected, we are used to measure the injectors rate and rework the injector in eletroerosion machines or even drill the tip if injectors with dremel or another hand-driller until the desired rate be achieved.
The fuel pump have also to be replaced, but I can find Bosch pumps made exclusively to work with alchool (Alchool corrodes the standard pumps).
For the advance in timing, we are used to repositioning the sensor in toothed well when this wheel is at crank pulley, or rework the wheel to match the new timing requirements. ECU remaping here in Brazil is a very hazardous work, because we have no professionals skilled at all, and frequently have to test various chips copied from foreign tuners that flies in friend's cars, not even being a easy work, reinforcing the "mechanical" way to advance the timing. The more professionals ECU tuners are too expensive, sometimes they charge over U$$500,00 to remap a chip, if there is no available chip in their library.
I bought the S2 few weeks ago and have no experience with this engine. I need someone more experienced to give-me some direction to follow.
If there is a way to make this rework in timing of ABY engine, I can make the fuel conversion and run with the pocket a little more full than the tank of my new toy.
Excuse-me my poor english, but if any point that no becomes well explained, ask and I can try to pass the details.
Thanks in advance to anyone who can help me.
Is there a easy, or better explaining, a mechanical way to advance the ignition timing by about 6 degrees, without remaping ECU?
I live in Brazil and here we have 3 main fuels at gas stations.
Regular 88 octane gasoline at about US$1,00 per litre, wich doesnt perform well in S2.
Premium 98 octane gasoline at about U$1,80 per litre, wich obtain full performance from car, but is very expensive to maintain tehe tank fullfilled.
Alchool (not methanol), wich have a octane rating equivalence of 104 octane, very cheap, about US$0,50 per litre, and easily found in any gas station.
All vehicles with aftermarket turbochargers here in Brazil uses this alchool as fuel, but to be effective, the ignition timing should be advanced to about 15 degrees at idle and about 28~30 degrees at wot in high RPMs to take full advantage of fuel. In moderate boost levels, until 15 psi os boost, 6 degrees of advance in entire timing map is effective to have a close to ideal timing map using alchool as fuel.
On same boost level, alchool gives about 15% more power than gasoline, and need a higher compression ratio in aspirated engines, but in gasoline original turbocharged engines like ABY, it give us a possibility to increase the boost level about 30% without detonation problems, and giving us the correspondent gain in power.
Alchool have a lower calorific power than gasoline for same mass, a increase of 30~35% in injected fuel is necessary. To increase the fuel injected, we are used to measure the injectors rate and rework the injector in eletroerosion machines or even drill the tip if injectors with dremel or another hand-driller until the desired rate be achieved.
The fuel pump have also to be replaced, but I can find Bosch pumps made exclusively to work with alchool (Alchool corrodes the standard pumps).
For the advance in timing, we are used to repositioning the sensor in toothed well when this wheel is at crank pulley, or rework the wheel to match the new timing requirements. ECU remaping here in Brazil is a very hazardous work, because we have no professionals skilled at all, and frequently have to test various chips copied from foreign tuners that flies in friend's cars, not even being a easy work, reinforcing the "mechanical" way to advance the timing. The more professionals ECU tuners are too expensive, sometimes they charge over U$$500,00 to remap a chip, if there is no available chip in their library.
I bought the S2 few weeks ago and have no experience with this engine. I need someone more experienced to give-me some direction to follow.
If there is a way to make this rework in timing of ABY engine, I can make the fuel conversion and run with the pocket a little more full than the tank of my new toy.
Excuse-me my poor english, but if any point that no becomes well explained, ask and I can try to pass the details.
Thanks in advance to anyone who can help me.
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