Holley HP EFI conversion
The following users liked this post:
SB (04-26-2021)
04-25-2021, 07:35 PM
#242
Registered
After a long process I finally made it to Smitty's (articfriends) place.We spent 2 days tuning and trying different things. A few snags and technical difficulties, but all in all a big success.
Any guesses? 461, 9:1, 237°/243°, 0.646"/0.686", 2/3-4/7 swap, ported heads, 87 octane.
Any guesses? 461, 9:1, 237°/243°, 0.646"/0.686", 2/3-4/7 swap, ported heads, 87 octane.
The following 3 users liked this post by sutphen 30:
Platinum Member
The following users liked this post:
articfriends (04-26-2021)
04-26-2021, 09:49 AM
#244
Registered
Thread Starter
This is all off the top of my head at the moment. Smitty can correct me if I'm wrong.
A. 1st pull after some MAP learning and base fuel transfers. Dyno headers no air cleaner 523HP@6000
B. Best pull dyno headers no air cleaner 584HP@6100, 525TQ@5000
C. Dyno headers and mufflers consistently pulled ~577HP, ~515TQ
D. Full trim CMI E-Tops and Flame arrestor 562@5900, 509TQ@4800.
The engine did not like additional spacer and gained a couple HP without any spacer.
AFR's were really good on this intake and I believe we got them within 0.6 of a point AFR all the way across using a 2D map for correcting each individual cylinder. Example: adding 2% up to 4000RPM 90 MAP+ and 4% 4000+RPM 90MAP+. Peak TQ liked a little leaner than Peak HP if I recalled.
Steve can get deeper into the technical tuning and subsequent results.
This is a graph between C & D. The CMI's helped in cruise area and better average TQ in cruise area.
.
A. 1st pull after some MAP learning and base fuel transfers. Dyno headers no air cleaner 523HP@6000
B. Best pull dyno headers no air cleaner 584HP@6100, 525TQ@5000
C. Dyno headers and mufflers consistently pulled ~577HP, ~515TQ
D. Full trim CMI E-Tops and Flame arrestor 562@5900, 509TQ@4800.
The engine did not like additional spacer and gained a couple HP without any spacer.
AFR's were really good on this intake and I believe we got them within 0.6 of a point AFR all the way across using a 2D map for correcting each individual cylinder. Example: adding 2% up to 4000RPM 90 MAP+ and 4% 4000+RPM 90MAP+. Peak TQ liked a little leaner than Peak HP if I recalled.
Steve can get deeper into the technical tuning and subsequent results.
This is a graph between C & D. The CMI's helped in cruise area and better average TQ in cruise area.
.
The following 2 users liked this post by Rookie:
Gimme Fuel (04-27-2021), OldSchool (08-28-2021)
04-26-2021, 09:51 AM
#245
Registered
Thread Starter
When I was at 252/264 I was just over 600. When I went down to 235°/241° - 0.646" I was thinking ~550. This put my TRS Scarab Panther to 82 and my non-stepped 37 Active Thunder to 75. My heads flow 404 @ 0.650" and the exhaust flow extremely well also, 300 something. I forget the number though. New cam is 237°/243° - 0.684". The dyno numbers are fun to discuss, but end results in the boat are what really count. I went faster in my Panther with smaller cam, less compression, less HP. I assume more torque and bringing the RPM's down. Getting peak TQ and HP closer together. 5600 vs 6500 RPM.
The following users liked this post:
articfriends (04-26-2021)
The following users liked this post:
Rookie (04-26-2021)
05-28-2021, 10:52 PM
#247
Registered
Thread Starter
Second engine on the run stand and all wired up. I flashed the 2nd ECU with new firmware and loaded the Master dyno file from the 1st engine. Will fire it up tomorrow and break in the "refresh" and hopefully have the engines in this weekend.
If you're not following my thread in the AT section. I had a little set back...
If you're not following my thread in the AT section. I had a little set back...
Got a little sidetracked. Had to do a quick emergency re-bearing on the 2nd engine. (non dyno'd engine) Saturday night, while the oil pan was off and I was replacing the cam on the engine. I decided to take a quick peak at the middle main bearing. To my surprise it looked terrible. (<20hrs on rebuild) I tore it down Saturday night and had it back together Tuesday night. Last time I had run the engine was the end of 2019. I was running up river at Hot Boat and threw a sea pump belt. I noticed the engine was a little off. I looked at my gauges and my water and oil temp was around 230-240°F. I shut it down and idle back on one engine. Brought the boat home fired it up and winterized the engines. Everything ran great during the winterization and I thought nothing of it it again. While the engines have been sitting in the shop while I painted and transom'd the boat I did a leak down. They were 8-11% cold and not fired for over a year. I also cut open the filter and the pleats were clean. In the bottom of the oil pan there was a black sludge and that drew my curiosity to pull the main. I have never seen any sludge in one of my engines.That Oil was toast!
I can't wait for this Holley EFI with all the alarms and limp modes to protect an engine!
I can't wait for this Holley EFI with all the alarms and limp modes to protect an engine!
05-29-2021, 06:43 AM
#248
Registered
Have an idea what caused the bearing failure?
05-29-2021, 10:51 AM
#250
Registered
Bummer
