GYTR Exhaust

Does the GYTR exhaust require addition of a fuel programmer?

keetmanaa wrote:

Does the GYTR exhaust require addition of a fuel programmer?

No and well kind of.

It will work without the programmer and plenty of people have done it. It doesn't appear to hurt the engine but may lean it out in some spots but it is you bike and your choice. It will work better with a programmer and a PCV programmer at that. They are about $50 more expensive than the FMF if you shop around. And you should pay about $260-280.

But it comes down to personal preference and money. But the mods are like an addiction and when you look at modding the airbox and look to get a bit more power again it is good to have a programmer installed. I actually installed my PCV with fuel and ignition before my exhaust. It smoothed out the jerkiness and helped it lug better at low RPM and pulls harder at higher RPM.

speersie wrote:

keetmanaa wrote:

Does the GYTR exhaust require addition of a fuel programmer?

No and well kind of.

It will work better with a programmer

Does the fuel programmer also improve the on/off throttle snatch?

It does. I can't speak for the FMF it is not as well refined as the PCV. The PCV can add and remove fuel every 250 RPM (FMF can only add fuel and only at low mid and high RPM). You can load PC premade maps or have one custom made on a dyno. You can also make changes yourself on you PC and upload the map. There are people on here that are willing to share maps and will list their mods.

This is another members thread with the gains he got from a custom tune and some ignition changes. These gains are from another members map which he already had a lot of gain from stock.
https://wr250rforum.forumotion.com/t11192-pcv-fuel-ignition-fuel-map-to-share

If you want and have the spare cash you can buy an auto tune module for it that makes it closed loop and keeps it at the desired range for that RPM again this can be set either for all or you can set it per 250RPM which means you can lean it out for cruising and better fuel economy. If you have a lot of time you can do maps per gear.

This place is where I got mine and still seems to have the best deal. If you can find it for better than $280 with fuel and injection your doing well RRP is all but $400.
https://www.motomummy.com/dynojet-powercommanders/dynojet-powercommander-v-dual-sport/dirt/

I would try the CO adjustment 1st. On mine the air box & exhaust mods were easily compensated for with the stock adjustments & eliminated the throttle snatch. That was before the bore & stroke....

CO mode and TPS adjustement made a huge gain on the "drivability"on mine, I dont run a programmer.

4play wrote:

I would try the CO adjustment 1st. On mine the air box & exhaust mods were easily compensated for with the stock adjustments & eliminated the throttle snatch.

What value did you set CO to?

keetmanaa wrote:

4play wrote:

I would try the CO adjustment 1st. On mine the air box & exhaust mods were easily compensated for with the stock adjustments & eliminated the throttle snatch.

What value did you set CO to?

Not sure it works like that. Meaning you can't just use another persons number since it appears that number is set at the factory depending on the performance of the bike. Most bikes seem to have different values.

From what I remember it seems that most people end up with a a setting about 5 numbers higher than what they had. The key is to adjust it, ride it, adjust it, ride it, so on and so forth until you are happy.