Sam
04-06-2002, 04:03 PM
Not exactly boating weather here in Michigan but I couldn't help myself (39 degrees). I took the sixteen out today for it's first run with the upgrades I added this winter. I wanted to make sure all was well under the hatch as well as put some time on and do some preliminary prop testing. The water conditions were very light nothing more than a six inch chop or so.
I started off with an out of the box 21" Mirage Plus.I must say that the low and mid range power was incredible. I wanted to be very conseritive due to the fact that the motor only has shop time on it up until now. Here are the numbers for the 21" Mirage. All the numbers below are with a full tank of gas.
37.5mph @3000
45@mph @3400
50mph@ @4000
54.5@ @4400
61.5 @4900( Hit rev limiter)
Now this is where it gets interesting I put the 21" Stiletto on and it starts bumping at 4900 rpm, almost like a small miss, obviously hitting the rev limiter. So I put on an out of the box 23" Mirage Plus, with the following numbers.
38mph @3000
48mph @3400
53mph @3800
56mph @4000
62mph @4800
I think that there is at least another 200 rpm to be had with the 21" Mirage. Why ? because the Stilleto definitely hit the rev limiter and I believ the 21" Mirage did as well. The 23" never made it to 4900 which leads me to believe that this number is true. So what does this mean, it means that when you do the pitch vs RPM math it appears that I have left RPM's on the table based on the 21" Mirage numbers and the rev limiter.
So what to do ? that's where you come in. Jamie Root informed me that the Thundebolt V ignition on my boat does indeed have a rev limiter pre set at 5000 rpm or so. Jamie didn't you say that you switched your V for a IV and by doing so eliminated the factory limiter. I need some sugestions on what I might do. Do I switch to a Thunderbolt IV or do I look at something from the after market. Keep in mind that I would like to do this as cost effectively as posible.
I think the 21" Mirage looks the most promising at this point. I know there is more speed there based on the rpm numbers I just have to find it.
THX
Sam
I started off with an out of the box 21" Mirage Plus.I must say that the low and mid range power was incredible. I wanted to be very conseritive due to the fact that the motor only has shop time on it up until now. Here are the numbers for the 21" Mirage. All the numbers below are with a full tank of gas.
37.5mph @3000
45@mph @3400
50mph@ @4000
54.5@ @4400
61.5 @4900( Hit rev limiter)
Now this is where it gets interesting I put the 21" Stiletto on and it starts bumping at 4900 rpm, almost like a small miss, obviously hitting the rev limiter. So I put on an out of the box 23" Mirage Plus, with the following numbers.
38mph @3000
48mph @3400
53mph @3800
56mph @4000
62mph @4800
I think that there is at least another 200 rpm to be had with the 21" Mirage. Why ? because the Stilleto definitely hit the rev limiter and I believ the 21" Mirage did as well. The 23" never made it to 4900 which leads me to believe that this number is true. So what does this mean, it means that when you do the pitch vs RPM math it appears that I have left RPM's on the table based on the 21" Mirage numbers and the rev limiter.
So what to do ? that's where you come in. Jamie Root informed me that the Thundebolt V ignition on my boat does indeed have a rev limiter pre set at 5000 rpm or so. Jamie didn't you say that you switched your V for a IV and by doing so eliminated the factory limiter. I need some sugestions on what I might do. Do I switch to a Thunderbolt IV or do I look at something from the after market. Keep in mind that I would like to do this as cost effectively as posible.
I think the 21" Mirage looks the most promising at this point. I know there is more speed there based on the rpm numbers I just have to find it.
THX
Sam