how are we supposed to tune timing on a rotary?
#1
how are we supposed to tune timing on a rotary?
I have a single turbo 20b. Got a great base map from Howard Coleman, and the car runs great. I backed off timing ~5 degrees in all rpm, and even more in boost from the provided base map to be on the safe side.
I know my timing is too retarded. I'm waiting on a pulley to get here so I can set TDC. Once that's done, how do I safely advance the timing? what parameter do the rotary tuners use to advance timing? is it strictly experience? MBT? EGT? when "x" extra ft-lb is made with a degree advance on a dyno? Thank you for any advice in advance.
I know my timing is too retarded. I'm waiting on a pulley to get here so I can set TDC. Once that's done, how do I safely advance the timing? what parameter do the rotary tuners use to advance timing? is it strictly experience? MBT? EGT? when "x" extra ft-lb is made with a degree advance on a dyno? Thank you for any advice in advance.
#4
back with rotaries
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pretty good question to ask, i my self would like to learn how to tune timing on my 13b. i have my microtech setup good right now but i wish i have better understanding about to tune timing. C. ludwig. is a great video but you have to pay to watch it. and yes you have to pay to learn but most people just need some advice to what to look for.
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https://www.rx7club.com/engine-manag...etter-1089664/
another data point. i don't really have a conclusion, but the observation is to look at both FC timing maps and look how different they are. there is a bigger difference in timing than the power difference would suggest
another data point. i don't really have a conclusion, but the observation is to look at both FC timing maps and look how different they are. there is a bigger difference in timing than the power difference would suggest
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true. the intakes changed too, along with the exhaust manifold, and turbo. also in 89 they started having to warranty the cat for much longer (7 years instead of 3). the S4 and S5 NA cars run very different AFR's after 4000rpm, it wouldn't surprise me if the turbo was the same. weirdly i've never had a wideband on a stock ecu turbo car
#9
true. the intakes changed too, along with the exhaust manifold, and turbo. also in 89 they started having to warranty the cat for much longer (7 years instead of 3). the S4 and S5 NA cars run very different AFR's after 4000rpm, it wouldn't surprise me if the turbo was the same. weirdly i've never had a wideband on a stock ecu turbo car
#11
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Sparks instant relative to crank position, no. You could place the plug in the exhaust port and telling the ECU to fire at 20° BTDC is still going to fire it at 20° BTDC relative to the crank. Now, does moving the plug position make the engine want different spark timing? That's the question.
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82streetracer
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