Hey guys, here are the dyno charts you've been waiting for... but first a little intro material. The engine build this time is a high 11 to low 12 point compression setup (not 100% sure what it really is). Bore is 85mm and stroke is 89mm. The sleeve is by Golden Eagle, and the rest of the block hardware (oil squirters, oil cooler, factory catch can, girdle) is standard GSR stuff. The pistons are strutted high wrist pin units by Endyn, and the rods are custom length units from Eagle. The head is 100% stock right now, except for a pair of Skunk2 cam gears that are set at zero. More on that later.
Dyno charts are 600x450, and are clickable for 800x600 images in a new window.
This first dyno chart shows the engine trimmed in on a Hondata S200 system. The blue lines are from a base map pulled from a previous customer's high compression B20/VTEC build. The red lines are my engine. The power peaks at around 7000rpm, which is lower than my previous B20/VTEC build. That's a good thing. The torque curve is higher and flatter as well, and falls off slower past the peak than the last build also.
This second chart shows what happens when you start playing with the cam timing. Just by changing a few degrees, you shift the entire power curve. We weren't showing any improvements over the entire rev range, but playing with the intake cam timing WAS able to give a 7hp increase in all revs below VTEC. At the same time, it killed power above VTEC. We were not able to get any favorable results with rough cam tuning, so timing was left at zero for both the intake and exhaust. The cam timing will get played with again when new camshafts go into the engine.
Just FYI, I think the intake timing was retarded a 2-3 degrees between the two power curves shown above.
We made one more run later that night with everything set back to normal, and the output was:
185hp / 152lbft at the wheels
Those are the numbers I'm sticking to. Enjoy.
Dyno charts are 600x450, and are clickable for 800x600 images in a new window.
This first dyno chart shows the engine trimmed in on a Hondata S200 system. The blue lines are from a base map pulled from a previous customer's high compression B20/VTEC build. The red lines are my engine. The power peaks at around 7000rpm, which is lower than my previous B20/VTEC build. That's a good thing. The torque curve is higher and flatter as well, and falls off slower past the peak than the last build also.
This second chart shows what happens when you start playing with the cam timing. Just by changing a few degrees, you shift the entire power curve. We weren't showing any improvements over the entire rev range, but playing with the intake cam timing WAS able to give a 7hp increase in all revs below VTEC. At the same time, it killed power above VTEC. We were not able to get any favorable results with rough cam tuning, so timing was left at zero for both the intake and exhaust. The cam timing will get played with again when new camshafts go into the engine.
Just FYI, I think the intake timing was retarded a 2-3 degrees between the two power curves shown above.
We made one more run later that night with everything set back to normal, and the output was:
185hp / 152lbft at the wheels
Those are the numbers I'm sticking to. Enjoy.