Ask the Builder...

[Morgan]

x3. I am also curious on your findings of TPS connected vs. not and the reasoning behind your selection.

 

The TPS decifers between a part throttle and WOT map. We have not seen any changes on the dyno with the plug plugged in or unplugged so we simply don't run it on the 04/05 bikes. Also, many of our 04/05 builds have cut down harnesses with the TPS plug stripped out.

 

 

Just personal preference really.

[OTMTRX]

What about TPS on 06+ ? Same thing? Thanks..

[junkie]

I don't see the tuning as a potential issue unless the summer heat is starting to fatten the bike up significantly. Do you have a way to hook it up to a laptop to check the TPS function and Duty Cycle of the injector? If so, make sure the TPS reads both 0 and 100% and if the Duty Cycle goes over 80% its time to step up on injector size.

 

I checked and the speed sensor was plugged back in. However I read that the Dyna ignitions cancel out the speed sensor anyway, can you confirm this because I'd like to know for sure?

 

I'll see if I can figure out how to check the TPS and Duty Cycle readings you listed as soon as I can diagnose an electrical problem I'm having with it right now.. I have the whole harness unwrapped even, it's killing me. I might have Roy lend me a few parts from his daughters 700 to see if it will help me diagnose the issue. Thanks brother, appreciate all the good info.

[ghott]

Going to ask quite a few questions which I am very seriously curious about...and hopefully get a little more discussion going on the forums. I hope Morgan has a little bit of time to where he can answer these...I know Demon is under a pretty heavy work load lately.

 

1.) For a SB/SS TRX450R engine, if you could only pick one, what do you feel is more important; velocity and the right size port or pure CFM the head can flow?

 

2.) 04/05 TRX450R intake rings: several companies make them...DASA, FUELATV, and I think even Racers Edge AZ makes one...maybe you guys do as well. Are they all the same or is one better than others?

 

3.) 04/05 TRX450R air filters: what is your preference? DASA, Velocity, FUELATV with inverted cone...and I've heard that REAZ also makes a HUGE K&N style filter that is even larger than the aforementioned ones?

 

4.) Dyna ignitions: is Demon able to make custom maps for Dynatek programmable ignitions upon customer request? Can anyone send their ignition to you and have the stock curve put on with an extended rev limit? Since you're a site sponsor/builder here...can you say what the price for that sort of thing is out in the open?

 

5.) Lastly, is there a point in the 04/05 TRX450R cylinder heads where epoxy is no longer required, or is it always required? If so, what is that point? 500cc+, 550cc+, 600cc+ ?? Or is epoxy use dictated by something else such as how large of a cam you run...or is a combination of things?

[Morgan]

Going to ask quite a few questions which I am very seriously curious about...and hopefully get a little more discussion going on the forums. I hope Morgan has a little bit of time to where he can answer these...I know Demon is under a pretty heavy work load lately.

 

1.) For a SB/SS TRX450R engine, if you could only pick one, what do you feel is more important; velocity and the right size port or pure CFM the head can flow?

 

2.) 04/05 TRX450R intake rings: several companies make them...DASA, FUELATV, and I think even Racers Edge AZ makes one...maybe you guys do as well. Are they all the same or is one better than others?

 

3.) 04/05 TRX450R air filters: what is your preference? DASA, Velocity, FUELATV with inverted cone...and I've heard that REAZ also makes a HUGE K&N style filter that is even larger than the aforementioned ones?

 

4.) Dyna ignitions: is Demon able to make custom maps for Dynatek programmable ignitions upon customer request? Can anyone send their ignition to you and have the stock curve put on with an extended rev limit? Since you're a site sponsor/builder here...can you say what the price for that sort of thing is out in the open?

 

5.) Lastly, is there a point in the 04/05 TRX450R cylinder heads where epoxy is no longer required, or is it always required? If so, what is that point? 500cc+, 550cc+, 600cc+ ?? Or is epoxy use dictated by something else such as how large of a cam you run...or is a combination of things?

 

1.) The more things you fix on a TRX head the more it's going to flow. The port shape will always be my main concern. The velocity and CFM will come in time with working the shape and size of the ports. Smooth, long radiuses, no sharp edges, no waves, dead air, etc etc are all things to take care of. We see a lot of "big number" CFM heads talked about, which is great, but it doesn't show anything about how it got to that number. Remember low lifts are seen twice, max lift is only seen once. Also, the stability of the air and making sure it doesn't back up at any time during testing through .450 lift is much more important than a big CFM number.

 

2.) The DASA ring and filter work very well on the 04-05 TRXs.

 

3.) DASA and the FCI filters will get most to where they need to be. The RE filter will make slightly more power, but the filter is far to long to fit into the stock airbox, so for people who ride in mud and/or water and need to keep the box, it's not a viable option.

 

4.) We make custom maps for all types of motors. With the TRX we have built enough to know a range of timing and where it needs to step to on each build. The Dyna is not for all builds though. For example, a pump gasser with modest compression will like the 40* of timing that a stock CDI box has, while a bigger motor in the 500+ range will want timing pulled, otherwise it will fight itself on top. Fuels also play a huge roll in timing. Oxy fuels will require a lot less timing due to their lower octane ratings, otherwise the motor will push the headgasket out. We charge $50 for custom Dyna curve mapping.

 

5.) The misconception with the TRX heads is that they need epoxy, especially the 04-05 heads. They do not NEED epoxy. You can go over 300 without a drop of it. Will it be as stable as a head that uses epoxy to fix port shapes? No. I see a lot of epoxy being added for the wrong reasons. Epoxy is used to fix dead air on the roof, increase radiuses (sharp radiuses will push fuel away and coagulate on the floor) and to increase the SSR. The motor size for us dictates port widths, volumes in CCs, and valve size.

 

Think I got all your questions, let me know if I didn't, it's been a crazy couple of weeks.

[ghott]

Morgan, fantastic answers! Glad you're on this site to be able to answer these type of questions!

[ridinredjav]

got a quastion. do you taper bore carbs?

[Kfx450r]

Have you ever done any work on a Kfx450 head? If so what kind of cfm have you got?