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Post  JR Performance Motorsport on Sat 30 Jun - 23:54

Ok guys !!! I need to slow my out of water revs. I am hitting 8000 plus when I come out of the water, normally I run 6200 to 6400 ina heat, but in shit water I end up sucking alot of air in the straight aways. I'm thinking of switching to a flywheel from a flexplate. The problem I see is the flexplate is 164 teeth http://www.summitracing.com/parts/SCA-FP-460-SFI/ and the flywheels have 184 or 176 teeth http://www.summitracing.com/parts/CTF-700280/ .

Do I need to get a 4/5 speed locator plate from a manual truck to do this ?

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Post  Wheelie58 on Sun 1 Jul - 14:18

Jim,
The difference in starter location between a 164 tooth auto Trans and a stick setup with the 184t wheel is approximately .6655" (radius from the crank center)
I can make you a custom starter locator plate, but your flywheel housing (for the boat) will stlii have the wrong (smaller) location. I will assume the starter bolts to the boat's flywheel housing.
We could make a 3/8" thick plate with the "new" starter location and bolt the starter to that, if you can't get a different flywheel housing.
Just brainstorming....
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Post  richter69 on Sun 1 Jul - 15:34

Why not use a rev liniter?
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Post  maverick on Sun 1 Jul - 17:55

richter69 wrote:Why not use a rev liniter?

Makes sense to me....but I ain't no boat racer. Arrow
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Post  whatbumper on Sun 1 Jul - 21:01

I don't see changing to a flywheel will help any. Rev limiter.

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Post  JR Performance Motorsport on Mon 2 Jul - 12:11

I can put almost any chip in the box and it will walk right on past it.

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Post  maverick on Mon 2 Jul - 12:24

Suspect MSD?
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Post  maverick on Mon 2 Jul - 13:05

Never saw one just run right past a functioning rev limiter...but, again, I'm not a boat racer. What type limiter are you using?
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Post  JR Performance Motorsport on Mon 2 Jul - 15:13

f I puta 6800 in it my tach will show a spike of 8200, if I put a 7200 it drops to 7800. The box is a 6AL and the rev limiter does work. I have tested it a few times with low rpm chips.

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Post  richter69 on Mon 2 Jul - 15:28

I've broke driveline parts in the past at wot and never had one rev past the set limit, sometimes the chips can be off some also.
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Post  maverick on Mon 2 Jul - 18:54

richter69 wrote:I've broke driveline parts in the past at wot and never had one rev past the set limit, sometimes the chips can be off some also.

Same here. I've busted rears & trannys with no over-rev.

Lem's a nautical sorta dude....Wutsup here, Lem?
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Post  Lem Evans on Mon 2 Jul - 19:33

The FP-460-SFI is an external bal. flexplate.
The FP-460A-SFI is an internal bal. """""""""".

Whatever the tooth count/dia. is on the Scat unit...it's the same as the stock flex plates...the heavy manual trans. flywheel is a different animal.

I do not think a flexplate/flywheel change will address your issue.
Can it be heard when the engine is susposed to be on the chip?

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Post  JR Performance Motorsport on Mon 2 Jul - 23:36

Yes every chip on the lower rpm can be heard ! Say I put the 3500 chip in, it hits it and wont go above. I put the 4500 in and it hits it and wont go above. I put the 5k in and same thing, on the trailer. I put the 6400 in and I walk right past it. Same with the 7200 chip ! I bought new ones thinking they were old and bad. Same thing they walk right on by !

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Post  Wheelie58 on Tue 3 Jul - 1:08

Using an MSD ignition tester ( the one that simulates the engine running) would help pinpoint this issue.
That tester is great for things like this.


Last edited by Wheelie58 on Tue 3 Jul - 7:39; edited 1 time in total
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Post  466cj on Tue 3 Jul - 2:48

There is either a noise issue, ground issue, or problem with the MSD box.

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