Hp comparison - Honda TRX Forums: Honda TRX 450R Forum
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post #1 of 9 (permalink) Old 03-06-2019, 02:58 AM Thread Starter
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So my 04 Trx 450 will be getting dynoed and a 2007 trx 450 with a uni filter and a slip on exhaust made 38 hp, and a 2006 yfz 450 with full exhaust uni filter head work and a cam ( can’t remember which one) made 45 hp, is it just me or do these numbers seem a little low, and what do should my bike put out for hp on this dyno, and if the dyno does seem low what up should it be at, thx

I have 12:1 cp piston hrc cam full lrd exhaust, 2006 air box with uni filter, and 03 crf 450 fcr

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post #2 of 9 (permalink) Old 03-06-2019, 10:47 AM
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I would guess you in the 38-40 range, but that would just be me. There is a lot about it that could be changing to low reading, did they run an a/f gauge to check the jetting? A lot can be gained or lost there, even if they had good set ups the jetting could kill it. Also, the 07 has a lot of room for growth with little additions, I think that is a good reading for it. Tell where you are dynoing and others may have experience on how it reads compared to different dynos.

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post #3 of 9 (permalink) Old 03-06-2019, 01:18 PM Thread Starter
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Originally Posted by duke416ex View Post
I would guess you in the 38-40 range, but that would just be me. There is a lot about it that could be changing to low reading, did they run an a/f gauge to check the jetting? A lot can be gained or lost there, even if they had good set ups the jetting could kill it. Also, the 07 has a lot of room for growth with little additions, I think that is a good reading for it. Tell where you are dynoing and others may have experience on how it reads compared to different dynos.
Yeah they use a a/f gauge, I would think I would be a little higher than a 07 with just a slip on and air filter.

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post #4 of 9 (permalink) Old 03-06-2019, 01:35 PM
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I’m not sure why you expect to be higher than the ‘07. You have the same compression, same carb, similar cam, and same air intake, only difference is a full pipe vs SO, and no offense, but LRD is not a great exhaust.

I as well as countless others have said many times, a dyno is not for bragging rights. A dyno is a tool for tuning and seeing the gains from mods and changes to your bike. So whether it makes 38 or 42 HP doesn’t really matter, the most important thing is that it makes the most power with the parts you have.
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post #5 of 9 (permalink) Old 03-06-2019, 01:58 PM Thread Starter
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I’m not sure why you expect to be higher than the ‘07. You have the same compression, same carb, similar cam, and same air intake, only difference is a full pipe vs SO, and no offense, but LRD is not a great exhaust.

I as well as countless others have said many times, a dyno is not for bragging rights. A dyno is a tool for tuning and seeing the gains from mods and changes to your bike. So whether it makes 38 or 42 HP doesn’t really matter, the most important thing is that it makes the most power with the parts you have.
I never said it was for bragging rights, the 07 has a stock cam, so I figured it would just be a little higher

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post #6 of 9 (permalink) Old 03-06-2019, 06:14 PM Thread Starter
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Yeah the lrd exhaust was on the bike when I got it, I will be going with dasa eventually but thanks for your responses.

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post #7 of 9 (permalink) Old 03-07-2019, 03:11 PM
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Keep in mind that throwing a few parts at it won't make the gains the same parts can make with the right supporting parts.
For example, take a completely stock bike and replace only the head with a RE +1 head and you might only gain 1-2 hp
Now make it a 13-1 480, add a web 208, 43.5mm fcr, Dasa exhaust, and dasa intake but dyno it with the stock head, then swap out to the RE head and the head will bump the numbers by about 10 hp.

As for the dyno numbers I would also guess around 40, but as hoser said it's just numbers, they mean nothing unless you plan to go back after more mods to see what your gains are. If you plan to go back after more mods do yourself a favor and have a pre dyno routine, like fresh oil, clean filter, check valves, and clean and lube the chain, I have seen a non o ring chain that was dry gain 5 hp with a good shot of lube
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post #8 of 9 (permalink) Old 03-07-2019, 03:23 PM
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I wasn’t implying that YOU were going for bragging rights, but many do. And sorry, I know it says CRF carb, but for some reason I was thinking it also had a CRF cam, the HRC will give you more power over the CRF cam. And again, not trying to knock your exhaust, it’s better than than stock, I just never had good success with LRD.

Good tips from Hawk.
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post #9 of 9 (permalink) Old 03-07-2019, 10:47 PM Thread Starter
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Originally Posted by hawk-trx View Post
Keep in mind that throwing a few parts at it won't make the gains the same parts can make with the right supporting parts.
For example, take a completely stock bike and replace only the head with a RE +1 head and you might only gain 1-2 hp
Now make it a 13-1 480, add a web 208, 43.5mm fcr, Dasa exhaust, and dasa intake but dyno it with the stock head, then swap out to the RE head and the head will bump the numbers by about 10 hp.

As for the dyno numbers I would also guess around 40, but as hoser said it's just numbers, they mean nothing unless you plan to go back after more mods to see what your gains are. If you plan to go back after more mods do yourself a favor and have a pre dyno routine, like fresh oil, clean filter, check valves, and clean and lube the chain, I have seen a non o ring chain that was dry gain 5 hp with a good shot of lube
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Originally Posted by hoser View Post
I wasn’t implying that YOU were going for bragging rights, but many do. And sorry, I know it says CRF carb, but for some reason I was thinking it also had a CRF cam, the HRC will give you more power over the CRF cam. And again, not trying to knock your exhaust, it’s better than than stock, I just never had good success with LRD.

Good tips from Hawk.
Lol yeah I was just clarifying, but the lrd will definitely be going away eventually

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