Redline increase?

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cOoTeR
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Redline increase?

Post by cOoTeR » Wed Mar 21, 2018 7:33 pm


The first I heard of bumping the redline up was when I had my ZX10R Derestricted. I think most people were bumping the redline up 500-1000rpms. My bike was a 2012, so people had been doing this without issues for a year before I was having my bike flashed. I was sceptical and decided to bump my redline up 1k rpms and never had any issues.

I've seen guys on the H2 forum bump their H2s redline up 1k rpms and I haven't been able to find anyone having problems with it. The H2 SX SE has a redline of 12k rpms and looks like the power is still building all the way to redline once it's derestricted. So in theory revving a little longer will build more boost and more power. But how do you know how far you can push it?

The H2 SX (SE) has the same valves as the H2 but different springs and cam. The bore and stroke are also the same but the compression is different.
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Stock with airfilter 164whp 84ft.lbs
De-restricted + tuned 213whp 97ft.lbs
Full vandemon exhaust with tune 221whp 99ft.lbs
On Race Fuel 233whp 103ft.lbs

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Re: Redline increase?

Post by kman0066 » Thu Mar 22, 2018 12:12 am


They should be able to handle another 500-1000rpm to handle the occasional over-rev, but raising the Rev limiter removes that cushion, but who knows how much is safe.

You can watch on a Dyno for a power loss from valve float or wait for the bang of a spun bearing...or the sheering of the crank itself in some bikes. It's a risky business. I'm a little nervous there with all that power to cast pistons, let alone at faster RPMs. The gains from the tune alone make me happy and I'll probably do a filter and exhaust, then leave her alone. I think past that, you'd be gambling too much on the non-forged rotating assembly.

Although, given enough engineer in knowledge and measurements, you could probably calculate a safe rpm. I'd personally not touch it until a shop did extensive testing.
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Re: Redline increase?

Post by ghostwriter78 » Fri Mar 23, 2018 5:24 am


the issue wont be the engine rpm but supercharger... at 12000 engine rpm the supercharger is running at about 100 000 RPM. also consider the increased pressure in cylinder.
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Re: Redline increase?

Post by cOoTeR » Fri Mar 23, 2018 11:35 am


ghostwriter78 wrote:
Fri Mar 23, 2018 5:24 am
the issue wont be the engine rpm but supercharger... at 12000 engine rpm the supercharger is running at about 100 000 RPM. also consider the increased pressure in cylinder.
That is part of the point of bumping the redline. Guys with the H2 have been bumping up the redline to get more boost. They've even changed the supercharger gears to get more supercharger revolutions resulting in higher boost.

Where are you getting the information from that the break in is more important because tage bike had a supercharger? It's a new engine and the supercharger has very little to do with the breaking in of the engine.
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Stock with airfilter 164whp 84ft.lbs
De-restricted + tuned 213whp 97ft.lbs
Full vandemon exhaust with tune 221whp 99ft.lbs
On Race Fuel 233whp 103ft.lbs

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Re: Redline increase?

Post by Vmatti » Fri Mar 23, 2018 8:36 pm


DIY "changing the supercharger gears" :D

Last edited by Vmatti on Sat Mar 24, 2018 11:00 am, edited 1 time in total.
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Re: Redline increase?

Post by Vmatti » Sat Mar 24, 2018 8:21 am


Vmatti wrote:
Fri Mar 23, 2018 8:36 pm
DIY "changing the supercharger gears" :D

https://www.youtube.com/watch?v=hyeqvU06q9Q
Last edited by Vmatti on Sat Mar 24, 2018 11:01 am, edited 2 times in total.
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H2SX SE with panniers and Vandemon H2R (+Akrapovic)
Ex: ZZR-1400 -12
Ex: Suzuki Hayabusa -08
Ex: Kawasaki Z750 -04

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Re: Redline increase?

Post by ghostwriter78 » Sat Mar 24, 2018 9:15 am


Didn’t they say that H2 sx SE gears will be sealed so you can’t get in?
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Re: Redline increase?

Post by cOoTeR » Sat Mar 24, 2018 11:41 am


ghostwriter78 wrote:
Sat Mar 24, 2018 9:15 am
Didn’t they say that H2 sx SE gears will be sealed so you can’t get in?
I never saw that anywhere. Just undo the two bolts circled in the picture and you'll get to the top gear. Should be able to get to the bottom gear by removing the side case cover.
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Stock with airfilter 164whp 84ft.lbs
De-restricted + tuned 213whp 97ft.lbs
Full vandemon exhaust with tune 221whp 99ft.lbs
On Race Fuel 233whp 103ft.lbs

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Re: Redline increase?

Post by kman0066 » Sat Mar 24, 2018 12:47 pm


The S/C unit itself is labeled as non-serviceable, the gears going to it could be changed just like the H2. That's not to say you couldn't get into the S/C unit, but they won't be recommending you do or be offering internal parts.
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Re: Redline increase?

Post by vcyclenut » Sat Mar 24, 2018 8:40 pm


I'm always conservative when raising redline and usually stick to 250 rpm over stock and then only if the bike is holding on to its power well at the stock redline or still building

most bikes are falling off by the stock redline and should be shifted prior to redline anyway and the extra revs are just over rev so you can hang on to a gear longer if wanted.

be interesting to see how this bikes responds to more revs and how far people will push it.
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