1988 sr1 272 prop question
#11
The 260 horse 350 has a specified range of 4200-4600 but peaks at about 4400 on a dyno. What is the specified range for the 320efi, 5000-5400? I just meant that in real life on a dyno there probably isnt much gain from 5k to 5400 with that motor, maybe just a couple horse.
Be interesting to see what you find with the 21s
Be interesting to see what you find with the 21s
#12
The 260 horse 350 has a specified range of 4200-4600 but peaks at about 4400 on a dyno. What is the specified range for the 320efi, 5000-5400? I just meant that in real life on a dyno there probably isnt much gain from 5k to 5400 with that motor, maybe just a couple horse.
Be interesting to see what you find with the 21s
Be interesting to see what you find with the 21s
#15
Registered
I have an 87 272 with the same 320efi engines but I am also running the AlphaSS drives so it's not a direct comparison. I am currently running a pair of 23 mirage and have no trouble spinning the motors above 5000 rpm. I'm actually looking for a pair of the mirage pluses to bring the rims down a bit and hopefully improve my slip some.
Have you checked your tachs to verify they are accurate? I have seen them off by as much as a few hundred rpm in the past. The reason I ask is your slip seems very low (which is great if it's accurate) but I wouldn't be surprised if your tachs are a bit off and your actually closer or slightly above 5000 rpm.
Have you checked your tachs to verify they are accurate? I have seen them off by as much as a few hundred rpm in the past. The reason I ask is your slip seems very low (which is great if it's accurate) but I wouldn't be surprised if your tachs are a bit off and your actually closer or slightly above 5000 rpm.
#16
I have an 87 272 with the same 320efi engines but I am also running the AlphaSS drives so it's not a direct comparison. I am currently running a pair of 23 mirage and have no trouble spinning the motors above 5000 rpm. I'm actually looking for a pair of the mirage pluses to bring the rims down a bit and hopefully improve my slip some.
Have you checked your tachs to verify they are accurate? I have seen them off by as much as a few hundred rpm in the past. The reason I ask is your slip seems very low (which is great if it's accurate) but I wouldn't be surprised if your tachs are a bit off and your actually closer or slightly above 5000 rpm.
Have you checked your tachs to verify they are accurate? I have seen them off by as much as a few hundred rpm in the past. The reason I ask is your slip seems very low (which is great if it's accurate) but I wouldn't be surprised if your tachs are a bit off and your actually closer or slightly above 5000 rpm.
What would you recommend a method of checking the tachs?
#19
I have an 87 272 with the same 320efi engines but I am also running the AlphaSS drives so it's not a direct comparison. I am currently running a pair of 23 mirage and have no trouble spinning the motors above 5000 rpm. I'm actually looking for a pair of the mirage pluses to bring the rims down a bit and hopefully improve my slip some.
Have you checked your tachs to verify they are accurate? I have seen them off by as much as a few hundred rpm in the past. The reason I ask is your slip seems very low (which is great if it's accurate) but I wouldn't be surprised if your tachs are a bit off and your actually closer or slightly above 5000 rpm.
Have you checked your tachs to verify they are accurate? I have seen them off by as much as a few hundred rpm in the past. The reason I ask is your slip seems very low (which is great if it's accurate) but I wouldn't be surprised if your tachs are a bit off and your actually closer or slightly above 5000 rpm.
#20
I will test with 21's soon a week from next sat. I did the full preseason yesterday finally.