Author Topic: LT500 Powervalve Dyno Results (Read 5443 times)

Glamisrider · « **Reply #25 on:** April 29, 2015, 03:15:49 pm »

Ok so for those of us who do not have or can afford to make dyno runs to adjust our power valves.

Is there a guideline for how many turns or portions thereof that equates to X RPM?

For example:
.5 Turn is approx X RPM
1 turn is approximately X RPM?
1.5 Turns is approx X

Thanks for the real information on the PV Jerry, lots of great insights.

MotorGeek - Jerry Hall · « **Reply #26 on:** April 29, 2015, 05:17:55 pm »

Quote from: Glamisrider on April 29, 2015, 03:15:49 pm

Ok so for those of us who do not have or can afford to make dyno runs to adjust our power valves.

Is there a guideline for how many turns or portions thereof that equates to X RPM?

For example:
.5 Turn is approx X RPM
1 turn is approximately X RPM?
1.5 Turns is approx X

Thanks for the real information on the PV Jerry, lots of great insights.

I did not pay close attention to the actual RPM change per turn of the dial but my memory says it was about 500 to 600 RPM change per 1 turn of the dial.

Glamisrider · « **Reply #27 on:** April 29, 2015, 06:38:38 pm »

I don't think I communicated my question clearly, please let me rephrase it.

So Q recommends that his PV is adjusted to 1.75 turns CCW which would equate to his PV closing at 875 RPM?

And if someone recommends 1 turn CCW with their set up then the power closes at 500 RPM?

I was thinking more like;
1 turn CCW sets the PV closure at approx. 5,500 RPM
1.5 Turns sets it at approx. 6,000 RPM
2 turns sets it at approx. X,XXX RPM

I'm sure I'm missing something here.

Thanks

MotorGeek - Jerry Hall · « **Reply #28 on:** April 29, 2015, 06:53:42 pm »

Yes I think you understand what I was attempting to say:

Turning the dial one turn will change the PV closing RPM about 500 to 600 RPM from what ever the closing RPM was before the dial was turned

Toydoc · « **Reply #29 on:** April 30, 2015, 01:22:25 am »

Quote from: MotorGeek on April 29, 2015, 02:19:29 pm

The 3 graph shows the inconsistency of the Power Valves closing RPM made back to back over a time period of 30 seconds. The zig zags are produced when the valve closes at a RPM where the closing point is not at the optimum RPM.

If you flip the bottom line to time and not rpm it shows how quick the zig zag happens. Real quick.
Then you take it to the track and run it on timers, alot of times it will ET quicker with a little zig zag then with out.
Just a guess, but I think it helps set the bike / tires for a millisecond.
Makes you want to pull your hair out I know that.

Good stuff MotorGeek. thanks for posting

MotorGeek - Jerry Hall · « **Reply #30 on:** April 30, 2015, 07:27:51 am »

Quote from: Toydoc on April 30, 2015, 01:22:25 am

Quote from: MotorGeek on April 29, 2015, 02:19:29 pm

The 3 graph shows the inconsistency of the Power Valves closing RPM made back to back over a time period of 30 seconds. The zig zags are produced when the valve closes at a RPM where the closing point is not at the optimum RPM.

If you flip the bottom line to time and not rpm it shows how quick the zig zag happens. Real quick.
Then you take it to the track and run it on timers, alot of times it will ET quicker with a little zig zag then with out.
Just a guess, but I think it helps set the bike / tires for a millisecond.
Makes you want to pull your hair out I know that.

Good stuff MotorGeek. thanks for posting

I have found it is better to error on closing the valve a little too soon than a little too late.

Looking at the graph and using a RPM drop of 1500 to 1800 RPMs between shifts, the optimum shift point would be around 7700 to 8000 RPM.. Shifting at 7700 to 8000 RPM will drop the RPM to the 6000 to 6500 RPM range between shifts. If the optimum closing point is 5700 RPM on this engine package, closing the valve 500 hundred RPM too soon will not affect the portion of the power band you are using. If you close the valve 500 too late the power will be affected in the portion of the power band that you are using.

coolbronco · « **Reply #31 on:** April 20, 2019, 07:17:49 am »

i know you inentionally left out hp rating, but as a new owner id like to know. mainly because legends get a little grander every telling. ive heard hp stock from 65-95 and top speeds from 80-110.

MotorGeek - Jerry Hall · « **Reply #32 on:** April 20, 2019, 02:15:58 pm »

A stock of the show room floor LT500R will make around 50 hp to the rear wheels on my dyno.

The formula for horsepower is:

HP = (Torque x RPM) / 5252

Torque and RPM were on most of the graphs. On one of the graphs peak Torque of 57 ft.-lbs occurred ad 6500 RPM.

Example:
(57 x 6500) / 5252 = 70.5 hp

This engine was not stock..... It had a big carb, head work, porting, and intake system and a HPR 19 exhaust system.

The sag or small dip in the power curve between 6500 and 7500 RPM after the power valve was properly adjusted, was due to the intake system's tuned length and porting not being right

coolbronco · « **Reply #33 on:** April 21, 2019, 02:40:03 am »

thanks for the info. i don't think ill be messing with power valve cause i'm just trying to hold on. previous owner told me that my bike was 95 horsepower and could go over100mph. this is my first bike/atv, so learning on this beast is scary. barely hit the gas and your doing wheelies?Im scared to hit the gas because of that. i just need way more hours, but cant register trailer or quad without titles. hey, do you own a registered garage? maybe you could help if you do. the dmv actually told me to find a registered garage and do a leinholders title reissuance, then pay them to get them 'sold' back to me.....sad that government wants to control everything, but doesnt know how to deal wth anything out of their parameters. anyways, im a professional not a car theif, so this shady idea presented by the dmv lady actually would work. i wonder if she even realized that what she saying was the secret car thief formula.

Quote from: MotorGeek - Jerry Hall on April 20, 2019, 02:15:58 pm

A stock of the show room floor LT500R will make around 50 hp to the rear wheels on my dyno.

The formula for horsepower is:

HP = (Torque x RPM) / 5252

Torque and RPM were on most of the graphs. On one of the graphs peak Torque of 57 ft.-lbs occurred ad 6500 RPM.

Example:
(57 x 6500) / 5252 = 70.5 hp

This engine was not stock..... It had a big carb, head work, porting, and intake system and a HPR 19 exhaust system.

The sag or small dip in the power curve between 6500 and 7500 RPM after the power valve was properly adjusted, was due to the intake system's tuned length and porting not being right

Rainman56 · « **Reply #34 on:** April 22, 2019, 04:12:01 am »

Quote from: coolbronco on April 21, 2019, 02:40:03 am

thanks for the info. i don't think ill be messing with power valve cause i'm just trying to hold on. previous owner told me that my bike was 95 horsepower and could go over100mph. this is my first bike/atv, so learning on this beast is scary. barely hit the gas and your doing wheelies?Im scared to hit the gas because of that. i just need way more hours, but cant register trailer or quad without titles. hey, do you own a registered garage? maybe you could help if you do. the dmv actually told me to find a registered garage and do a leinholders title reissuance, then pay them to get them 'sold' back to me.....sad that government wants to control everything, but doesnt know how to deal wth anything out of their parameters. anyways, im a professional not a car theif, so this shady idea presented by the dmv lady actually would work. i wonder if she even realized that what she saying was the secret car thief formula.

Quote from: MotorGeek - Jerry Hall on April 20, 2019, 02:15:58 pm
A stock of the show room floor LT500R will make around 50 hp to the rear wheels on my dyno.

The formula for horsepower is:

HP = (Torque x RPM) / 5252

Torque and RPM were on most of the graphs. On one of the graphs peak Torque of 57 ft.-lbs occurred ad 6500 RPM.

Example:
(57 x 6500) / 5252 = 70.5 hp

This engine was not stock..... It had a big carb, head work, porting, and intake system and a HPR 19 exhaust system.

The sag or small dip in the power curve between 6500 and 7500 RPM after the power valve was properly adjusted, was due to the intake system's tuned length and porting not being right

Not saying the previous owner is wrong but 95HP seems like a stretch...Until you see what has been done to the bike,pipe,head,carb,porting,etc you really can't even get an idea.Even with some aftermarket stuff I think 60HP is more the norm...Pretty sure it would have to be modified to the max and even then 95HP is a stretch but I'm no expert by any means...You definitely won't be running pump gas.

Also post some pics of the bike in one of your other threads

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Author Topic: LT500 Powervalve Dyno Results (Read 5443 times)

Glamisrider

Re: LT500 Powervalve Dyno Results

MotorGeek - Jerry Hall

Re: LT500 Powervalve Dyno Results

Glamisrider

Re: LT500 Powervalve Dyno Results

MotorGeek - Jerry Hall

Re: LT500 Powervalve Dyno Results

Toydoc

Re: LT500 Powervalve Dyno Results

MotorGeek - Jerry Hall

Re: LT500 Powervalve Dyno Results

coolbronco

Re: LT500 Powervalve Dyno Results

MotorGeek - Jerry Hall

Re: LT500 Powervalve Dyno Results

coolbronco

Re: LT500 Powervalve Dyno Results

Rainman56

Re: LT500 Powervalve Dyno Results

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