GSX1400 dyno graphs

[jrandom]

Runs done at TripleZee Cycles in Manukau this week on my GSX1400 K7, before and after installation of a BMC air filter and a bit of tweaking to the fuelling.

The bike has a TBR muffler - I'd be interested to see what it would've measured with the stock exhaust. A fair bit less power, I suspect. Too much hassle to take that measurement now just for the sake of curiosity, though.

No Dynojet equipment involved; these numbers represent reasonably meaningful rear-wheel HP on the day.

Make of it what you will...

[Gremlin]

Unless the fuel was way out, and more was done, as you can see, the addition of an air filter doesn't do much. But if you increase throughout other areas, then the change is more noticeable...

Only Suzuki (or maybe Hardley) would need 1400cc to get 95 hp

[jrandom]

Only Suzuki (or maybe Hardley) would need 1400cc to get 95 hp

Ah, but over 80 foot pounds of torque from 2500 rpm is a beautiful thing. Old-school aircooled IL4s ftw!

And, pfft, good luck getting a gen-ewe-eyne 95rwhp out of a Twin Cam 88 without spending thousands of dollars turning it into something almost, but not quite, entirely unlike what came out of the factory...

[kiwifruit]

Litre bikes for breakfast, lunch and tea!!

[nallac]

looking at that low down torque,it'd be a blast to ride.
and full horseys by 6500 makes an ideal NZ road bike.

I never realised that they where such low rev'ers.

[jrandom]

Litre bikes for breakfast, lunch and tea!!

She'd give your 4-litre inline six the learn au.

[jrandom]

looking at that low down torque,it'd be a blast to ride.
and full horseys by 6500 makes an ideal NZ road bike.

Fuckin oath, beautiful bike to ride. The numbers on paper don't do it justice.

I never realised that they where such low rev'ers.

Very soft stock cam profile.

The word on gsx1400.org is that something slightly less mild (Yoshi do a Stage 1 kit) lets that power curve ramp straight up to the redline at 9000rpm.

Om nom nom nom!

I should probably upgrade the suspension first.

[Scouse]

So have you got your licence back just in time for Christmas?

[Scouse]

Only Suzuki (or maybe Hardley) would need 1400cc to get 95 hp

cor you can be such a nob end somtimes, anyway even with "only 95 hp" I recon Beyond would show you the way around Coro even if you were still riding yer ZX10.

[jrandom]

So have you got your licence back just in time for Christmas?

Nope. April 2009. Strictly confined to the track until then.

[Sully60]

Very soft stock cam profile.

The word on gsx1400.org is that something slightly less mild (Yoshi do a Stage 1 kit) lets that power curve ramp straight up to the redline at 9000rpm.

Surely one of those engines would be good for much bigger numbers without going full on with the internals.

I was surprised to see redline at only 9K signed well off by then anyway, do you know if you can get a few more revs with a Power Commander or different ECU etc? Another 750 of 1000 revs with the cam you mention would good for a nice figure well over 100 without losing too much of that full cream midrange.

I should probably upgrade the suspension first.

Ohlins?

[Gremlin]

anyway even with "only 95 hp" I recon Beyond would show you the way around Coro even if you were still riding yer ZX10.

There's no replacement for displacement!! Besides... the road is not a racetrack young man

someone tell me why I dropped a third of the hp off, and I'm having more fun

[jrandom]

Surely one of those engines would be good for much bigger numbers without going full on with the internals.

Swapping the cams out isn't 'full on with the internals' in my books. If you look at the lift and timing on the stock ones it's the most obvious first tuning step.

I was surprised to see redline at only 9K signed well off by then anyway, do you know if you can get a few more revs with a Power Commander or different ECU etc?

Absolutely. The TripleZee man favours the Yoshi ECU over a Power Commander. And, no point swapping the cams out if you can't set up the ignition to work properly with them hey, so it'd be a given.

without losing too much of that full cream midrange.

Well, y'see, the word is that you can keep that full cream midrange and add some top end with a bit more aggression on the valves au. It's a seriously detuned motor in stock form.

Ohlins?

Only if I can source it via eBay.

But when I can get a very nice pair of fully adjustable Hagon rear shocks for NZ$800... which, oddly enough, is an openly advertised price that matches what they sell for overseas... it's a bit of a no-brainer, eh?

[Sully60]

Swapping the cams out isn't 'full on with the internals' in my books.

Of course not, you need to remove the cams to adjust the valve clearances, no point putting the standard ones back in if you've got some less pointy ones.

Well, y'see, the word is that you can keep that full cream midrange and add some top end with a bit more aggression on the valves au. It's a seriously detuned motor in stock form.

That would be quite an interesting machine to ride if your able to keep that fat line in the middle of the graph and make it keep going for longer, you may need to fit some clip ons though or otherwise get forearms like Popeye, Ya ca ca ca ca ca!

Suzuki are good at making inline fours strong, like old GSX1100 engines, built to last.
It's always a compromise with engine life, NVH and manitenance intervals etc, but meh, how long to you plan to keep it anyway?

[jrandom]

how long to you plan to keep it anyway?

She'd make a great Post Classics racer.