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Realistic Mod Expectations

This is a discussion on Realistic Mod Expectations within the Grom Performance forums, part of the Honda Grom Garage category; Whats the top speed if you go 2 up in the rear? I have that as well as an intake and exhaust and I bounce ...

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  1. #11
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    Whats the top speed if you go 2 up in the rear? I have that as well as an intake and exhaust and I bounce off the rev limiter on the highway. 5'11 155ish lbs
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    The fuel controller and cam will add a TON to what you have now, as you're not taking advantage of the intake & exhaust currently. 70 is easily achievable. The PCV will certainly work fine, but it's worth noting we have Bazzaz maps for that exact set-up, as it's pretty much our go-to package.
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    cam and intake will give the hp you need to run different gearing to attain higher speeds.
    Too many toys? nah. 09 Ducati sport classic, 74 rd350 LC hybrid, 73 RD350, 73 Kawasaki S2a, 67 Kawasaki C2TR 120 Roadrunner, 71 Kawasaki G3SS powered by a CR85 liquid cooled lump, 74 Moto-Morini 3 1/2 strada, 84 Yamaha RZ350, 1962 Ford falcon, 76 Ford maverick, very early 1970 non-us Spec Yamaha R5, 89 Yamaha DT50 bought NEW in 2015, 2015 KTM 390 Duke, 72 yamaha CS5.. . oh.. and 2014 Honda Grom with lots of mods.. (some useful, most not)

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    70 MPH is achievable but i've learned that a top speed goal isn't a good measurement. It is very conditional and if you're running these BPU's you need perfect conditions.

    What is important is the time it takes to achieve 60-65mph, because that is what you will need to rely on if riding on the freeway. When going up even the slightest incline or traffic slow downs, you need to keep up.

    Now if you don't want to ride on the freeway, then 70 MPH top speed is also not really important, because you won't be going that fast in the street. You can just gear your bike differently to have better acceleration.

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    Achieving 70 down a hill is really easy, stock can do that. doing 70 in a headwind up a hill isn't easily achievable even with a 181cc 4 valve or or a finbro 235. Unless of course you only weight 50kg and your so thin you pose no wind resistance.
    Last edited by Juls; 03-18-2017 at 10:03 PM.

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    Quote Originally Posted by Juls View Post
    Achieving 70 down a hill is really easy, stock can do that. doing 70 in a headwind up a hill isn't easily achievable even with a 181cc 4 valve or or a finbro 235. Unless of course you only weight 50kg and your so thin you pose no wind resistance.
    I have a 181 4v and it will blow past 70 in a headwind or uphill. As a matter of fact, it will do that with a passenger. I weigh 190 lbs suited.
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    my koso 170 4v will no problem also break 70 easy uphill in a slight headwind. im 195 or so.
    Too many toys? nah. 09 Ducati sport classic, 74 rd350 LC hybrid, 73 RD350, 73 Kawasaki S2a, 67 Kawasaki C2TR 120 Roadrunner, 71 Kawasaki G3SS powered by a CR85 liquid cooled lump, 74 Moto-Morini 3 1/2 strada, 84 Yamaha RZ350, 1962 Ford falcon, 76 Ford maverick, very early 1970 non-us Spec Yamaha R5, 89 Yamaha DT50 bought NEW in 2015, 2015 KTM 390 Duke, 72 yamaha CS5.. . oh.. and 2014 Honda Grom with lots of mods.. (some useful, most not)

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    Realistic Mod Expectations

    204 4v here. No problem 70 GPS uphill with headwind. 195 suited summertime, 205 just after the winter holidays until spring

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    Chimera intake, brocks alien head 2 exhaust, kitaco clutch cover, lightweight flywheel, aracer fuel management (with af1/dg1) and 15/36 gearing(kitaco speedo corrector). I weigh 185lbs soaking wet with gear and live/ride at 5100'. Grom will usually hit 65mph for me with a full tuck. I can get mid 40s to low 50s up hill. On good days or at lower elevation(trailering back from Texas as I type) it'll bang the limiter all day at 74mph(limiter raised to a hair under 10k) on flat ground.

    Currently have the finbro super stock set up(dome piston, new super head, new cam, and bored throttle body package) on order. I've heard claims of 80+ mph out of similar set ups.

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    were you in dallas riding with all the motovloggers?
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