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Originally Posted by SB
(Post 4541682)
Your under propped hitting the rev limiter.
No way toknow how fast it will go with hitting the limiter. 502MPI's run fastest if I remember right, right at 5,000rpm and OE rev limiter is 5150. I believe my 502s are stock with exception of the exhaust (CMI E-Tops) so I'm surprised that the 502s seem to have a good amount more a$$ to them compared to the hotter 454/420. I guess displacement and torque win! |
Originally Posted by TomZ
(Post 4541668)
To clarify... I would think that the 420 would have a leg up over the 502, but perhaps not in the the RPM range that it operates.
My old 420's were stroked so their performance was not a normal comparison to a 502 due to having more stroke which helps produce torque big time. Stroked the same I would still give it to the larger displacement. |
Sounds like 25 pluses to me Tom
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I ran 25 mirages on mine. I did try label 25 plus but that was not as good. the TRS boats have the props deep in the water so they tend to like the smaller diameter of the non plus props. I would try a 25 mirage and see how it goes from there.
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Originally Posted by Audiofn
(Post 4542739)
I ran 25 mirages on mine. I did try label 25 plus but that was not as good. the TRS boats have the props deep in the water so they tend to like the smaller diameter of the non plus props. I would try a 25 mirage and see how it goes from there.
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My stock 420's could spin my 23 non plus props to 5600 rpm but slip wouldn't let it break 70 mph. Ran it that way for a year and found some 25 non plus and have been running them since.
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The best I had was a 25 B-blades labbed plus. I just never could pull the trigger on the cost. I may have a set that I took off my boat when I sold it if you are interested.
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These boats with TRS anyhow like a LOT of trim. It is crazy that the more you trim the faster they will go. They never seem to blow out. The issue if you trim too much is you will chatter the gear set and blow the lower unit... Don't ask how I know but I hear they will go a bit over 74! LOL
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Originally Posted by Audiofn
(Post 4542857)
The best I had was a 25 B-blades labbed plus. I just never could pull the trigger on the cost. I may have a set that I took off my boat when I sold it if you are interested.
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Originally Posted by Audiofn
(Post 4542859)
These boats with TRS anyhow like a LOT of trim. It is crazy that the more you trim the faster they will go. They never seem to blow out. The issue if you trim too much is you will chatter the gear set and blow the lower unit... Don't ask how I know but I hear they will go a bit over 74! LOL
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