Theoretical 1/4 mile time?

[Tekgnome]

I got in a arguments with a coworker about a the potential 1/4 mile time that my bike could get.

Assuming a professional rider and a perfect launch what would my 1/4 mile be in my gsx750f?

Mods
1157 bandit engine
36mm kat carbs
Dyno jet kit
Pod filters
89 1100 gsxr intake cam
Holeshot +5* ignition advance
Barnette clutch spring.
Comp is 160-165psi
15/47 sprocket ratio
150/70/17 with a 79.6" circumference
Frames chopped in the rear
Gutted plastic and shaved fairings
165lbs with gear

Once my new valve cover gasket & chain tensioner arrives it will be dyno tuned. I estimate the hp to be around 115-120 with 70-80lbs of torque.




What do you think it's capable of running?

[92xjunker]

Web search the bike the motor came out of.

You'll have more than 120hp, the Kat 1100 is 130hp stock

[arsenic]

I don't know where you saw that the GSX1100F is 130 HP, but I'm guessing it's ~130 HP at the crank. If so, that's not 130 HP

[92xjunker]

Crank not wheel, I figured he's getting a dyno run. 118hp BHP

[kdo58]

http://www.motorcyclespecs.co.za/mod...1100f%2088.htm it says in this link says 130 at the rear wheel

[arsenic]

Well, it's says it on the internet, it must be true.

[92xjunker]

That's crank HP, minus drag gearing and such 118BHP, only one site shows this. 88-89 it's 108BHP

I'm seeing 132-136 crank HP, multiple sites. Few rear wheel actual hp ratings.
I like this site better http://www.suzukicycles.org/GSX-seri..._numbers.shtml
Wait that's a bandit motor so, 98HP

[Tekgnome]

Its a bandit 1200/1157 block not a kat 1100

Does have a ignition advance, gsxr1100 intake cam, pods, & dyno jet kit which should bump the crank hp around 115-120

[92xjunker]

98HP then, you shouldn't really be looking for HP but, torque. If you put GSXR1100 cams you'll gain HP on the top end.

PODS and dyno junk won't give you much to even consider. The advancer and the cam is where your power will be. The advancer will not actually give you more HP but, move the power band lower in the rpm range. I wouldn't be shocked if you gain only 5-7HP, maybe a little more but, not much more.

[Tekgnome]

98HP then, you shouldn't really be looking for HP but, torque. If you put GSXR1100 cams you'll gain HP on the top end.

Its just the intake cam, the b12 has a awesome exhaust cam profile.

Im in the process of getting a Invoice for a 1216 kit but this march the bike scheduled for all new bearings, gaskets, machining, and a shiny 1216 kit.

The stock b12 can hit 11.15 so I figured im around a 10.8 -10.9

[shpielers]

What's the weight of a b12 vs the kat? Might factor in too.

[92xjunker]

It does...very close to the same weight

[arsenic]

All the bolt on stuff you add does not "bump up" the HP. HP is only increased by over boring or increasing the stroke. The HP is made by the pistons. Nothing, I repeat, nothing you bolt on changes that one bit. It changes the RPM range and where on the RPM curve power is maximized. It doesn't do a damn thing to the HP number. By saying, "well it has pod filters, that should help" you're sounding like an idiot. Pod filters don't do anything for an engine like this. For race engines that are max top end with no care for mid range torque, they help. Don't be the guy that thinks you'll gain anything by using pods, you won't.

[92xjunker]

Not entirely but, correct. If you choke a motor down with mild cams,restrictive heads and exhaust, you could get more HP out of a motor by changing or modifying those issues. I've be taught the power is in the head, flow means everything and no replacement for displacement. Then the turbo and super charger were introduced... not saying he will get an increase or not. I'd start with decking the head, possibly fly cut the Pistons if needed, port and valve upgrades and cam upgrades before any major motor build considerations.

[arsenic]

Guy, I understand what you are saying. If you increase flow, you may gain HP, like 3. I'm not trying to split hairs over the possible 5 HP you can gain by bolting shit on. You said it, "no replacement for displacement". I'm fairly confident we're not dealing with a mechanical engineer here that will have a firm understanding of flow rates to HP output. That is the simplest way to think about it, the pistons make the HP. Without over boring or stroking your motor, you're not going to achieve any noticeable gains. Honestly OP, I'm not trying to talk down to you, but you bought a cheap Katana, the engine got blown up somehow. You bought a dirt cheap B12 engine, it was installed not by you. You're planning all these bolt on mods, which I doubt you'll bolt on. If this bike ever moves, I got 10 to 1 odds you wreck it before you get to a drag strip... just sayin'