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Discussion Starter · #1 ·
Hello,

I have a 07 trx450er with motor freshly rebuilt with HRC cam, 480 big bore, HRC header with big gun silencer cut to shorty exhaust, jd +1 a-arms, AC racing nerf bars, tag racing +2 steering stem with tag racing bars, DWT rear beadlocks, DWT polished front rims, gripper seat cover, no air box lid and k&n filter. I currently can go 71mph with a 14/38 gearing. I want to try to get it to 80mph. What gearing would I need to reach this speed? I am not worried about loosing any bottom end as it has plenty of that it. I want to beat the top speed of my buddies ltr450 which can go about 76-78mph.

thanks for any help in advance.
 

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Truck Yea
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smaller rear sprocket. try a 36 or 37.
 

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Discussion Starter · #3 ·
smaller rear sprocket. try a 36 or 37.
Thanks I will probably order one of those. I had another thought though instead of gearing it I could get a stage 3 hotcam. Do you think that would get it to 80?
 

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Discussion Starter · #5 ·
Adding power will not make you go even .000001 mph faster.
I thought that the stage 3 hotcam has more top end power than the HRC cam that I have now which has more bottom end power.
 

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Stage 3 HC will have most of the power at the end of the RPM range, but like hoser started to mention, HP doesn't =faster. You could have any cam you want, when you change gearing it effects whatever the motors supplying in that gear. Yes stage 1 power peaks lower in the rpm curve, stage 3 power peaks at the end of the rpm curve, Stage 2 is basically the HRC cam's twin brother, he just wakes up a little quicker. But, you take any of those cams and change gearing your changing the ratio of power to RPM. If you have TALL gears you wont be in that gear long before rev limit and shift is needed. So, if you just want to be the fastest out of your bunch, with the info you've provided (no distance to get to speed etc) I believe you ll want as few teeth as possible on both sprockets. There is limits as the chain has to have the right amount of adjustment or your chain will be too long to tighten. I'm no pro at any of this, just going off what I've learned over the years. Also sent a link to gear ratio/speed calculator which allows you to enter a few parameters (tire size, sprocket teeth #, etc) and the calculator will throw back a graph with a lot of useful data, for you its top speed in any one particular gear with your entered setup. www.gearingcommander.com
 

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Also, changing cams can lead a lot more possible mistakes being made during dis-assembly re-assembly, and the time to do so, compared to swapping sprockets just to show your boys what time it is....Make sure your running low psi in your shoes for high speed runs. The psi will almost double spinning that fast in theses little tires which effects circumference, which can lead to wrecks at top speeds, especially on pavement/asphalt
 

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Discussion Starter · #9 ·
Stage 3 HC will have most of the power at the end of the RPM range, but like hoser started to mention, HP doesn't =faster. You could have any cam you want, when you change gearing it effects whatever the motors supplying in that gear. Yes stage 1 power peaks lower in the rpm curve, stage 3 power peaks at the end of the rpm curve, Stage 2 is basically the HRC cam's twin brother, he just wakes up a little quicker. But, you take any of those cams and change gearing your changing the ratio of power to RPM. If you have TALL gears you wont be in that gear long before rev limit and shift is needed. So, if you just want to be the fastest out of your bunch, with the info you've provided (no distance to get to speed etc) I believe you ll want as few teeth as possible on both sprockets. There is limits as the chain has to have the right amount of adjustment or your chain will be too long to tighten. I'm no pro at any of this, just going off what I've learned over the years. Also sent a link to gear ratio/speed calculator which allows you to enter a few parameters (tire size, sprocket teeth #, etc) and the calculator will throw back a graph with a lot of useful data, for you its top speed in any one particular gear with your entered setup. www.gearingcommander.com
Also, changing cams can lead a lot more possible mistakes being made during dis-assembly re-assembly, and the time to do so, compared to swapping sprockets just to show your boys what time it is....Make sure your running low psi in your shoes for high speed runs. The psi will almost double spinning that fast in theses little tires which effects circumference, which can lead to wrecks at top speeds, especially on pavement/asphalt
this is a statistical flow chart type for reference
Thankyou for taking the time to break down how all that works I understand it a lot better now.
 

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2006 trx 450er. Stock motor, sparks full exhaust, elka legacy series shocks, and many more boltons!!
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I was going to say smaller sprocket in the back too. Not sure about the front tho. Might take away to much out the hole, but I’m no expert. I think the stock sprocket sizes are the same for ltr and trx, if so is it just the EFI that gives the ltr the edge? Or gearing too?
 

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I was going to say smaller sprocket in the back too. Not sure about the front tho. Might take away to much out the hole, but I’m no expert. I think the stock sprocket sizes are the same for ltr and trx, if so is it just the EFI that gives the ltr the edge? Or gearing too?
I believe with the ltr they have dual cams and are generally built from factory race quads with the nice advantage of a cherry bomb which turns those things into monsters. And I believe the gearing is a 14/37 or something like that it could be a 14/38 too. And the efi probably helps make it faster but the only problem with that is now your quad is a pain in the ass now lmao.
 

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For sprockets a bigger sprocket in the front makes it faster and a smaller sprocket in the front will make it slower and more torque. For rear the smaller the sprocket the faster it will go and the larger the sprocket the slower and more torque it will have.
 

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2006 trx 450er. Stock motor, sparks full exhaust, elka legacy series shocks, and many more boltons!!
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I believe with the ltr they have dual cams and are generally built from factory race quads with the nice advantage of a cherry bomb which turns those things into monsters. And I believe the gearing is a 14/37 or something like that it could be a 14/38 too. And the efi probably helps make it faster but the only problem with that is now your quad is a pain in the ass now lmao.
Yes I agree on the pain in the ass part. My Cuzin has one and it wasn’t running right. Ended up being a dirty fuel injector screen. Dude it was a nightmare to get to it, and the holes were so freaking small it was hard to pump anything thru it. Definitely a pain lol. I’m Honda all day.
 

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Discussion Starter · #15 ·
My buddies ltr450 has a barkers exhaust and a cherry bomb on it. Otherwise it is all stock. Some times it runs good other times it doesn’t run currently it isn’t running because his starter went out.
 

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Yes I agree on the pain in the ass part. My Cuzin has one and it wasn’t running right. Ended up being a dirty fuel injector screen. Dude it was a nightmare to get to it, and the holes were so freaking small it was hard to pump anything thru it. Definitely a pain lol. I’m Honda all day.
Yeah I also have a buddy with one too let’s just say it doesn’t currently run
 

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more power wont make you go faster, it will get you there faster. also a stage 3 hot cam with anything other than a big bore or stroker will not allow peak performance.

you are still limited by the gearing.
 

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Discussion Starter · #18 ·
more power wont make you go faster, it will get you there faster. also a stage 3 hot cam with anything other than a big bore or stroker will not allow peak performance.

you are still limited by the gearing.
Ok thanks, I will probably get a stage 3 hotcam in the future along with sending the head out to get ported and set up with stronger springs and valves, and a I will get a dasa exhaust.
 

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Making HP ain’t free. . .
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Just focus on making your machine the best for the type of riding you do and make it enjoyable for you to ride. There is always somebody faster, you change your sprockets, they’ll change theirs. Who cares who’s fastest, especially on a quad, thats not what these things are made for. But if making your quad unusable for the majority of riding and fastest out of your riding buddies is the most important thing to you, just make that gearing real tall and add NOS.
 

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Ok thanks, I will probably get a stage 3 hotcam in the future along with sending the head out to get ported and set up with stronger springs and valves, and a I will get a dasa exhaust.
welcome.

if you want to make more power the trick is to do the following: port head, stage 2 cam, full exhaust. that makes plenty of power for most. I was duning huge bowls in glamis with that set up no issue, were talking pinned 3-4th gear

right now i have a very built 470 kit with ported and polished head, oversized valves, bored carb, web cam, dasa and it MOVES. but its set up for GNCC/harescramble type riding and dunes.
 
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