dyno'd my J-Y 1600cc 4age Corolla
07-08-2004, 11:39 PM
#1
0.5 BAR
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Join Date: May 2003
Posts: 152
dyno'd my J-Y 1600cc 4age Corolla
I was pretty happy, 165.5 HP at 6800 RPM, 143.7 ft/lbs torque at 5000 RPM, was only making 7 psi. The goal for this trip was just to make sure I was on the right track, not to squeeze every last hp out of the engine.
The good news was this is more power than I thought I was making, and this particular dyno has a reputation of reading low. First pull proved that my O2 sensor is pretty close to useless since I had a pretty much stoich A/F ratio right across the board during the pull. After the first pull I targetted an A/F of 12 which was somewhat roughly accomplished, but it only added a couple hosepower. I then tried to lean it out basically 5% which netted a couple more horsepower. Toyota OEM NA 200mm clutch is holding the power well, although I don't know for how much longer.
The bad news was I was only making 7 psi, I usually make 8+, and it took a while to get their, since my last timing adjustments the car feels better, much better at least from a streetable perspective, but the peak boost is down. It could be just the environment, when I'm street tuning I use mostly 2nd and 3rd, they did all the runs in 4th, 4th gear at 7200 rpm is way too fast for the streets around here
The operator basically took the car up to a low load cruising speed 2800, held it for a second, then floored it. The operator suggested that probably certain areas of the map need richening up.
A little more tuning, and the boost figured out and it'll be up to 180 for sure
Neil
The good news was this is more power than I thought I was making, and this particular dyno has a reputation of reading low. First pull proved that my O2 sensor is pretty close to useless since I had a pretty much stoich A/F ratio right across the board during the pull. After the first pull I targetted an A/F of 12 which was somewhat roughly accomplished, but it only added a couple hosepower. I then tried to lean it out basically 5% which netted a couple more horsepower. Toyota OEM NA 200mm clutch is holding the power well, although I don't know for how much longer.
The bad news was I was only making 7 psi, I usually make 8+, and it took a while to get their, since my last timing adjustments the car feels better, much better at least from a streetable perspective, but the peak boost is down. It could be just the environment, when I'm street tuning I use mostly 2nd and 3rd, they did all the runs in 4th, 4th gear at 7200 rpm is way too fast for the streets around here
The operator basically took the car up to a low load cruising speed 2800, held it for a second, then floored it. The operator suggested that probably certain areas of the map need richening up. A little more tuning, and the boost figured out and it'll be up to 180 for sure
Neil
07-09-2004, 07:51 AM
#6
0.5 BAR
Thread Starter
Join Date: May 2003
Posts: 152
Re:dyno'd my J-Y 1600cc 4age Corolla
Thanks for the input guys.
Spark could be a problem, I'm using an old coil from a 91 Escort at the JY, I also gapped the plugs down to 25 thou from 44, without even trying 44, it made sense to me doing a one off setup like this to minimize failure points ahead of time, which is why I closed up the gaps right in the beginning.
I'm going to get new plugs and see if I have any spark problems with full gap, I'm hoping it will be OK, and try another coil.
I don't think it's detonation, when this car detonates it's obvious.
I could be pulling too much, I found that if I kept the bins a little extra retarded just prior to boost and during the first couple psi it really accelerated spool up significantly. For the upper rpms, say 4000+, I just drove around and kept advancing til I heard detonation, then backed it off a couple degrees for safety, this engine really isn't suited for boost.
Neil
Spark could be a problem, I'm using an old coil from a 91 Escort at the JY, I also gapped the plugs down to 25 thou from 44, without even trying 44, it made sense to me doing a one off setup like this to minimize failure points ahead of time, which is why I closed up the gaps right in the beginning.
I'm going to get new plugs and see if I have any spark problems with full gap, I'm hoping it will be OK, and try another coil.
I don't think it's detonation, when this car detonates it's obvious.
I could be pulling too much, I found that if I kept the bins a little extra retarded just prior to boost and during the first couple psi it really accelerated spool up significantly. For the upper rpms, say 4000+, I just drove around and kept advancing til I heard detonation, then backed it off a couple degrees for safety, this engine really isn't suited for boost.
Neil
07-09-2004, 08:27 AM
#8
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Thread Starter
Join Date: May 2003
Posts: 152
Re:dyno'd my J-Y 1600cc 4age Corolla
Originally Posted by spiceisler
What management are you using?
www.megasquirt.info
Neil
