04' TRX 450r with DRG porting

[Mobile Dyno]

Here is an 04' 450r. The owner (Mike Nash, GNCC Racer) was looking for more power (as we all are), so he got a DRG Performance Package. This Bike is a Stock Bore 450. I dynoed this bike in PA back in Aug. Mods then were:

Yoshi TRC Slip-on
HRC Kit
Stock Carb
Stock CDI
K178 main
Needle in the 2nd from top
2.5 turns out on the mix

36.7 hp-27.2tq

Mods Now:

Stock Bore
Stock Stroke
Stock Valves and springs
Rekluse Clutch
JE 13:5 Comp 3 ringer piston
HRC Cam (twisted -6 back)
DRG Porting
DRG Dome Shaping
DRG Unshrouding
DRG Taper Bore Carb(45mm-43mm)
DRG Airbox & Boot with K&N PowerLid (Lid Not in this test)
DRG "EXR" Filter
Dyna Ignition Curve 1
DASA Pipe
Jetting: K185 main, 58 pilot, 2nd clip from the Bottom on the needle, 1 turn out on the mix.

DRG Stock Bore 450r "Twin"

A/F Graph:
BLUE=Before Mods with K178 main
RED= After Mods with K185 main

Nice Improvment Mike He gained about 45% power gain
:D

[Mobile Dyno]

Hp

[Mobile Dyno]

..

[Mobile Dyno]

Tq

[Mobile Dyno]

A/F:

Blue= Mods Before with K178 main
RED= Mods After with K185 main

[chad502ex]

WOW!!

;)

LOL!

[mike nash]

I never thought I would own a 53HP machine!:D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D

[cals400ex]

how does this head compare to your dasa chad?

[czrider263]

Does DRG have a web site?

[chad502ex]

Originally posted by cals400ex
how does this head compare to your dasa chad?

i measured 5% more flow with 90cfm vaccuum. This is why I decided to port. Apparently, my porting, shaping, unshrouding was successful. Not trying to toot, but i've real happy I found a winning combination with readily available shelf parts like hrc cam , pipe, and carb.

[chad502ex]

Originally posted by czrider263
Does DRG have a web site?

chad502ex.com

[Doak450r]

nice job man almost identical numbers as me i got 53/34 with my stock bore

[exrider44]

That is awesome! I look forward to setting my bike up oneday like yours.

[mike nash]

Have to correct information,this was and is a JE 13:1 compression piston. Right off the shelf . This bike "ROCKS", I'd like to thank chad502ex for allowing me to be the "Twin" on this build. There is basically so much power in this bike that I have to learn how to ride it all over again. It's literally a new machine.

[cals400ex]

any way possible you could put this head, or another of yours, on a dyno with the dasa to see the comparisons?

[JIMTED79]

That seems to be a lot of horse power for the mods you have, if that is all your mods up top? Now thats just me talkin and I'm nobody, lol.

[2004exrider]

wow, im really impressed with those numbers. I remember when you posted the first picture of the 400 head, that thing was really opened up. Thats quite a bit of power to be unleashed.

Jimmy

[Mobile Dyno]

Originally posted by JIMTED79
That seems to be a lot of horse power for the mods you have, if that is all your mods up top? Now thats just me talkin and I'm nobody, lol.

Thats the great thing about the DRG Componets. Reliability and Alot of power in one:D

[chad502ex]

First of all:

Mike, I am extremely pleased that your love your new monster! I can not wait until mine is complete so we can roost together on the trails. Let me know when you are ready to meet up in PA this spring.

Second:
the assembly of my DRG stock bore 450R will be completed documented from the inside out on my updated website... I can tell ya this in advance that my realistic goal for this is stocker is at least 56.... ;) remember, that the DRG TWIN almost hit 54 with drop in components..... ;)

we'll have to wait and see.... :D

[hondardr4life]

You should be able to get 56 out of it. Full Baldwin motors are running 56-58 I hear, so I would I magine that you could get that out of yours.

[chad502ex]

Originally posted by hondardr4life
You should be able to get 56 out of it. Full Baldwin motors are running 56-58 I hear, so I would I magine that you could get that out of yours.

WOW, I'm in Baldwin catagory? maybe I should be building Pro's Racers engines ;) hehe

Good point though I definetly think at least 56 on my DRG setup will be obtainABLE.

[hondardr4life]

Hahaha, yea it is definetly obtainable. Do you build your own motors?? Rich Hetrick told me the other day "back when 250r's were the best out there, there was a lot of no name guys building high HP motors out of their garage, that were just as good as any pro builders motor"

[chad502ex]

Originally posted by hondardr4life
Hahaha, yea it is definetly obtainable. Do you build your own motors?? Rich Hetrick told me the other day "back when 250r's were the best out there, there was a lot of no name guys building high HP motors out of their garage, that were just as good as any pro builders motor"

thanks. yes I do build and have built many engines out of my garage. Not trying to boast much here, but all the builds I've done I've yet to see matching dyno numbers.

I love it. Especially happy for the ppl I've done engines for whom all seem to support the effort and results I've give them.... I have other friends that seem to come over and park thier machine in my garage that don't bother with forums too.

[cals400ex]

is there any way possible you can post the runs with RPM being on the X axis?

[chad502ex]

yes cal I will get them from Matt when we dyno mine next week and we dyno the DRG TWIN again too! You'll see both of the DRG in RPM

stay tuned.

[cals400ex]

that sounds good. i am ready to see this. will it be the same bike?

[chad502ex]

Originally posted by cals400ex
that sounds good. i am ready to see this. will it be the same bike?

yes, same DRG TWIN with same mods and everything. I plan uploading a custom ignition curve into the dynatyek ignition on the DRG TWIN to see what gains I can get out of her. Plus, need to replace the 06 airbox/airboot combo with the 04 airbox/airboot to compare the gains.

Of coarse my DRG is complete. Just need to drop it into the frame and a little other connects and FINALLY let her rip!.


wahhhhhoooooooooooooooooooo!

[wilkin250r]

Being the type of person I am, I'm not looking strictly at the peak HP numbers, but rather I'm looking at the entire curve.

The first thing that popped out at me was the high end. I assume the sharp drop-off is caused by the rev limit. It's still above 50HP when it hits the rev limit, the power has only dropped 6%.

I'm curious. Why does it cut off there? It would seem to me that there is still some useable power by extending the rev limit out a little further. Why would you cut it short where there is still 50HP to be utilized?

[chad502ex]

Originally posted by wilkin250r
Being the type of person I am, I'm not looking strictly at the peak HP numbers, but rather I'm looking at the entire curve.

The first thing that popped out at me was the high end. I assume the sharp drop-off is caused by the rev limit. It's still above 50HP when it hits the rev limit, the power has only dropped 6%.

I'm curious. Why does it cut off there? It would seem to me that there is still some useable power by extending the rev limit out a little further. Why would you cut it short where there is still 50HP to be utilized?

good question.

that was were the dyna ignition limit was set to. Remember, this engine had stock valves and stock valve springs. That 50+hp was made all the way to 10k limit without the possibility of floating any valves... Any more would be disasterous.

the lower 36hp curve used stock ingition and was limited to 9500 rpm and didn't have the scavenging effect that this setup does

[wilkin250r]

I figured that was the reason, and I am thus forced to question the logic behind it?

I'm not one to tell somebody how to build motors, but it would seem to me that a few hundred bucks in valves and/or springs would be well worth it. Half the reason these 4-strokes are easier to race than 2-strokes is that you're not limited to a narrow powerband.

What are the stock valves on the 450r? I seem to recall that it was either the 450R or YFZ that came stock with titanium valves.

[chad502ex]

Originally posted by wilkin250r
I figured that was the reason, and I am thus forced to question the logic behind it?

I'm not one to tell somebody how to build motors, but it would seem to me that a few hundred bucks in valves and/or springs would be well worth it. Half the reason these 4-strokes are easier to race than 2-strokes is that you're not limited to a narrow powerband.

What are the stock valves on the 450r? I seem to recall that it was either the 450R or YFZ that came stock with titanium valves.

9850 is the rev limit with these 450r engines. adding springs for a HRC cam and 11000 rpm as opposed to 10000 rpm is not worth $200 for springs alone. the purpose of better springs than stock isn't necessary the rev increase but mainly to be able to run bigger lift cams to prevent the valves from lofting over the top.

so, back to your original question: is it worth spending $200 more dollars on stiffer sprinngs on an HRC cam? no, Honda developed the HRC for the 450R without the need for stiffer springs. So, will the stock spring run up to 11000 rpm, not for long- they begin to sag out fast...

[cals400ex]

and the yfz is the one with titanium valves.

in 06 the honda has titanium intake valves though.

[mike nash]

Very pleased with how well Twin is operating. Power always there just asreliable as she was in stock form. Only difference is now she likes 112 leaded. Last two races pulled holeshot previous to that elbow to elbow with a 350r for the holeshot. Only issues so far was my accellerator pump jet was clogged and wasn't getting that initial shot of fuel,which in turn left me kicking on the start after everyone else rouned turn one.
Chad whats next for my set up?

[chad502ex]

Originally posted by mike nash
Very pleased with how well Twin is operating. Power always there just asreliable as she was in stock form. Only difference is now she likes 112 leaded. Last two races pulled holeshot previous to that elbow to elbow with a 350r for the holeshot. Only issues so far was my accellerator pump jet was clogged and wasn't getting that initial shot of fuel,which in turn left me kicking on the start after everyone else rouned turn one.
Chad whats next for my set up?


WTG!

Great to hear mike you like your new build.

Do you have any picture proof of your TWIN pulling any holeshot(s)?

This weekend I'll be dyno testing a new 450R component for another company out in California on my quad.. this could be the product i recommend..... :macho:

[mike nash]

How long will you leave us in suspense? Or will results be posted after testing?
Sorry can't seem to post pics here but if you go to http://www.thequadbuilder.com/forums/index.php?act=module&module=gallery&cmd=si&img=1787 I'm images1868-1871 35+ C class. By the way I'm not to sure but I may have had a flat in that corner and didn't notice til I hit the woods.

[chad502ex]

here's the holeshot you speak of....

good job.

[chad502ex]

another

[chad502ex]

third

[chad502ex]

last.