MCX will announce their kit(s) to Viper in Aprill

[Apex2006]

Sure sounds like if you are happy with Nytro power it wont be a issue with the Viper. Nytro and Viper same dyno same day needs to be done to find that out.

I know I will be interested in the delivery. Modded Nytros seem to have a issue with hesitation when throttle is hit hard. Never really heard why and most can tune most of it out but it is still there. Many suspect the E.B.C. system.

Do you guys know if MCX is using the AC ECU to tune the turbo? Should be possible.

In the rumoured 180/190 kit this is most likely the way, in the rumoured 270 kit there will likely be 3 additional fuel injectors controlled by MCX's own ECU while the stock fuel line is kept, well, stock. At least this is how it's done in Nytro.

Do note that engines are also individuals of sort, I'm sure that if 10 similar brand new engines were dynoed in the same bench in the same conditions there would be a difference of few hp. Considering this and the fact that different dynos provide. different results it's only a matter of academic debate whether the SR Viper has 130, 135 or whatever hp stock. I bet not many of us would feel the difference of a couple of hp. Again, if it feels slow when riding (compared to a stock Nytro), it's a matter of clutching and gearing. Personally I think that all N/A engines suit lawn mowers and such, a real sled needs boost

I agree with the boost, my Nytro was unbeatable till it over-boosted and damaged the motor. Do you think the YES program will cover a charger or turbo under the warranty program even if Yamaha installs it?

 

[yamaha1973]

Sure sounds like if you are happy with Nytro power it wont be a issue with the Viper. Nytro and Viper same dyno same day needs to be done to find that out.

I know I will be interested in the delivery. Modded Nytros seem to have a issue with hesitation when throttle is hit hard. Never really heard why and most can tune most of it out but it is still there. Many suspect the E.B.C. system.

Do you guys know if MCX is using the AC ECU to tune the turbo? Should be possible.

In the rumoured 180/190 kit this is most likely the way, in the rumoured 270 kit there will likely be 3 additional fuel injectors controlled by MCX's own ECU while the stock fuel line is kept, well, stock. At least this is how it's done in Nytro.

Do note that engines are also individuals of sort, I'm sure that if 10 similar brand new engines were dynoed in the same bench in the same conditions there would be a difference of few hp. Considering this and the fact that different dynos provide. different results it's only a matter of academic debate whether the SR Viper has 130, 135 or whatever hp stock. I bet not many of us would feel the difference of a couple of hp. Again, if it feels slow when riding (compared to a stock Nytro), it's a matter of clutching and gearing. Personally I think that all N/A engines suit lawn mowers and such, a real sled needs boost

I agree with the boost, my Nytro was unbeatable till it over-boosted and damaged the motor. Do you think the YES program will cover a charger or turbo under the warranty program even if Yamaha installs it?

I doubt it, a good dealer will probably cover non engine related items, but unless the kit is endorsed (sold) by Yamaha, I doubt they will cover anything engine wise.

 

[Alatalo]

Meanwhile at MCX...

 

[SRXSRULE2]

Here for an example of a stock exhaust manifold on a mustang and a performance replacement. As you can see the performance header has far more bends and increases hp. Enough said on this topic how the exhaust robs power.

If you want an interesting read, check this out Mustangs Fast Fords

The exhaust talk starts on page 13.

Those stock "manifolds" are not what you think they are, they are headers designed to help exhaust scavenging which is huge for making power. Putting those aftermarket "performance" headers on will actually kill those new 5.0's hp and torque potential.

Back to the Yamaha side of things, go back to the 2 stroke days. Buy a set of tripple pipes for an SRX from hauck or slp whoever you wish. Now go price them out at Yamaha. Then ask yourself why the Yamaha pipes are so expensive. Difference? Yamaha uses sound acoustics and all sorts of other cool stuff to tune their engines and intake/exhaust setups. Do you think any aftermarket company does that? There is way more R&D in a manufacturers design then most aftermarket systems have.

 

[kviper]

Some of the two stroke pipes that were sold as GYTR Yamaha pipes were built by a company owned by a close friend (Power INC) and a couple of my sled's were used to fit pipes, triple SX's, SRX and twin's. They worked very well but nothing special was used used for development other than trial and error with expandtion chamber configuration and silencer design for noise control with out restriction. As far as curves go an expandtion chamber is usually built straight till the power is achieved then cut in section's at angles and rotated to make the pipe fit where there is room. There is usually not much change needed after the curves to maintain performance.

In any case Yamaha is expecting the Viper will not run with a Nytro due to exhaust and induction.

 

[shadow44]

Some of the two stroke pipes that were sold as GYTR Yamaha pipes were built by a company owned by a close friend (Power INC) and a couple of my sled's were used to fit pipes, triple SX's, SRX and twin's. They worked very well but nothing special was used used for development other than trial and error with expandtion chamber configuration and silencer design for noise control with out restriction. As far as curves go an expandtion chamber is usually built straight till the power is achieved then cut in section's at angles and rotated to make the pipe fit where there is room. There is usually not much change needed after the curves to maintain performance.

In any case Yamaha is expecting the Viper will not run with a Nytro due to exhaust and induction.

You can't compare 2 stroke exhausts to 4 stroke...totally different animals

 

[kviper]

Some of the two stroke pipes that were sold as GYTR Yamaha pipes were built by a company owned by a close friend (Power INC) and a couple of my sled's were used to fit pipes, triple SX's, SRX and twin's. They worked very well but nothing special was used used for development other than trial and error with expandtion chamber configuration and silencer design for noise control with out restriction. As far as curves go an expandtion chamber is usually built straight till the power is achieved then cut in section's at angles and rotated to make the pipe fit where there is room. There is usually not much change needed after the curves to maintain performance.

In any case Yamaha is expecting the Viper will not run with a Nytro due to exhaust and induction.

You can't compare 2 stroke exhausts to 4 stroke...totally different
animals

I was not comparing but I was referring to srxrule2s post about how Yamaha's 2 stroke pipes were built and the fact that curves have little effect on exhaust on two stroke or four. I am very aware of the diff in two stroke and four exhaust, LOL. Thanks

 

[Nytro40th]

Here for an example of a stock exhaust manifold on a mustang and a performance replacement. As you can see the performance header has far more bends and increases hp. Enough said on this topic how the exhaust robs power.

If you want an interesting read, check this out Mustangs Fast Fords

The exhaust talk starts on page 13.

Those stock "manifolds" are not what you think they are, they are headers designed to help exhaust scavenging which is huge for making power. Putting those aftermarket "performance" headers on will actually kill those new 5.0's hp and torque potential.

Back to the Yamaha side of things, go back to the 2 stroke days. Buy a set of tripple pipes for an SRX from hauck or slp whoever you wish. Now go price them out at Yamaha. Then ask yourself why the Yamaha pipes are so expensive. Difference? Yamaha uses sound acoustics and all sorts of other cool stuff to tune their engines and intake/exhaust setups. Do you think any aftermarket company does that? There is way more R&D in a manufacturers design then most aftermarket systems have.

Example only, take it for what it is enough said.

 

[SRXSRULE2]

Curves in the exhaust, unless they are so tight they cause the pipe to squish and change diameter, have nothing to do with performance. Having a straight exhaust with no restrictions is only ideal on an engine running a turbocharger and that is after the turbo.
Things that do matter in an exhaust header are the size of the individual pipes (length and diameter), collector diameter and where the individual runners meet in the collector. All of these things can effect performance positively or negatively.

If all of the above didn't matter, they would run a manifold style exhaust going straight out the right side to collect at the muffler.

 

[Bonesmith]

Well, on my calendar it's May. Where's the kit announcement? The time crawls when You wait something...

 

[JCLG]

Here's a link to a pic from finnish sled forum for sometime back. Sled is ready. Yamaha doesn't give permission to give details out yet.

http://kelkkalehti.com/keskustelu/index ... 109827.720

 

[yamadoo]

Some things up with the link all of a sudden I cannot read. LOL Growing up in MN where a person has to travel thousands of miles to find a word in anything other than English I was surprised. Shouldn't be, I know just found it funny to see how small my world is.

Have a great day.

 

[vsmpowered]

need more info

 

[Apex2006]

Here's a link to a pic from finnish sled forum for sometime back. Sled is ready. Yamaha doesn't give permission to give details out yet.

http://kelkkalehti.com/keskustelu/index ... 109827.720

Need full translation please.....

 

[Puppe]

Shortly:
- Right side panel looks nice after some modification.
- Turbo works better than in Nytro, no bog at dynocurve when the boost starts
- More power, 290hp with 1.2bar
- Costs probably less than kit to Nytro