18ft Laser ltv 150 black max 60 mph???

**groovy** · 08-16-2021, 09:19 AM

I'm running a 26 chopper at 6000. Is this in the ballpark for mph? Was running 64, I added a torque tamer and tried regular instead of premium. Can't believe that would take away 4mph!

**rock** · 08-16-2021, 09:36 AM

Welcome to the site. Formula is RPM x gear ratio x pitch x .0009469. Assuming 2:1 gear and 15% slip you get 63 mph. Different gear ratio and different slip of course different results.

Rock

**groovy** · 08-16-2021, 11:49 AM

Thanks, I've seen a couple different formulas for the rpm x pitch. So I guess I'm close to where I'm supposed to be.
Still don't understand where I lost that four mph. Going to run premium next time out and see what happens. Ultimately
I'm going to put some more hp back there.

**rock** · 08-16-2021, 12:36 PM

From spring air to summer humid air will require different jetting for maximum performance. Just going from premium to regular 4 mph sounds like a lot.

Rock

**groovy** · 08-16-2021, 02:41 PM

Pretty much same conditions as far as air and water. Only other change was the torque tamer.

**hellbents-10** · 08-18-2021, 07:44 AM

Torque tamer could slow it a bit too.

**groovy** · 08-18-2021, 08:59 AM

I wondered about that. I wouldn't think 4mph though!!

**groovy** · 08-19-2021, 07:03 PM

Took it out today, drained the regular and ran premium. 60mph at 5800-5900.
Did squeek 61 once. So I guess take the torque tamer off and try again!!

**z1rider** · 08-19-2021, 09:17 PM

Originally Posted by rock

Welcome to the site. Formula is RPM x gear ratio x pitch x .0009469. Assuming 2:1 gear and 15% slip you get 63 mph. Different gear ratio and different slip of course different results.

Rock

I used your formula, and the result amazed me. 5,700X.54X19X.0009469X.85=47.07 MPH. Both my stainless, and aluminum, 14-1/2X19" had the same speed.

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**scott reierson** · 08-19-2021, 10:15 PM

Groovy... I sent you a PM

**groovy** · 08-20-2021, 07:09 AM

Can't figure out how to reply!!

**groovy** · 08-30-2021, 09:21 AM

Took it out with the torque tamer removed. Didn't really gain much if any! So I don't know where the 4mph went. I'm using the same gps as I was before so I guess it is what it is. Sucks though!! Lol. Anybody know what this rig should weigh? Tried a search and didn't find anything. Thanks

**groovy** · 08-30-2021, 09:27 AM

I came up with 925 dry so far.

**David - WI** · 08-30-2021, 09:31 AM

On mine a head gasket was leaking water into the cylinder. Compression tests didn't show any problem so I kept running it... trying to figure it out where the 4 mph went like you are... until is seized up.