Hi all,
A bit of background first. A year ago, I blew my engine up following a catalyst melt down. Looks like a piece of catalyst brick was swallowed by the exhaust port (under heavy decel???). I took the opportunity of the rebuild to request a pretty aggressive porting. Note that my RX-8 is now essentially a track day car that I sometimes drive on the road as well when I feel like it.
The engine breathes much better at high RPM, with performance to match. Unfortunately, the aggressive porting resulted in very high overlap between intake and exhaust, which means a big loss of low end torque, but also very difficult starts.
The crank fuel is too lean to start with, and starting under cold conditions require 2 - 3 goes. But warm, or hot, the situation gets worse. The base crank fuel is alrady too lean, but on top of that, the crank fuel decay is very sharp and it gets under ignitability well before the engine has had the time to start. This decay is a lot slower under cold start conditions.
I wonder if some very informed owner on this forum could give me the exact data that are in the following tables so I can identify them in my PCM reclaibration tool (Hymee Pro Tuner). I'm looking at the following tables (probably 2-dims) :
- The table(s) giving the initial crank fuel pulsewidth as a function of ECT
- The table(s) giving the crank fuel decay (usually as a function of engine cycles)
I did a search, and browse dozens of threads without finding what I'm looking for.
Your help would be much appreciated to render my RX-8 the perfect track day car!
Thanks,
Fabrice
A belgian owner.
Bonus : my RX-8 at Spa
A bit of background first. A year ago, I blew my engine up following a catalyst melt down. Looks like a piece of catalyst brick was swallowed by the exhaust port (under heavy decel???). I took the opportunity of the rebuild to request a pretty aggressive porting. Note that my RX-8 is now essentially a track day car that I sometimes drive on the road as well when I feel like it.
The engine breathes much better at high RPM, with performance to match. Unfortunately, the aggressive porting resulted in very high overlap between intake and exhaust, which means a big loss of low end torque, but also very difficult starts.
The crank fuel is too lean to start with, and starting under cold conditions require 2 - 3 goes. But warm, or hot, the situation gets worse. The base crank fuel is alrady too lean, but on top of that, the crank fuel decay is very sharp and it gets under ignitability well before the engine has had the time to start. This decay is a lot slower under cold start conditions.
I wonder if some very informed owner on this forum could give me the exact data that are in the following tables so I can identify them in my PCM reclaibration tool (Hymee Pro Tuner). I'm looking at the following tables (probably 2-dims) :
- The table(s) giving the initial crank fuel pulsewidth as a function of ECT
- The table(s) giving the crank fuel decay (usually as a function of engine cycles)
I did a search, and browse dozens of threads without finding what I'm looking for.
Your help would be much appreciated to render my RX-8 the perfect track day car!
Thanks,
Fabrice
A belgian owner.
Bonus : my RX-8 at Spa
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