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Discussion Starter · #1 ·
I have a 01 gsxr 750 and I noticed the 02 and up models are rated at a higher horsepower. I wanted to know how the increase was made and can I do it to my bike. I know the newer ones have higher compression. Is this the only difference and is it made with different pistons or with the head. Maybe it’s a totally different engine or something that I can change with a power commander. Any input would be helpful.
 

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Discussion Starter · #3 ·

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it looks to me the main thing that has changed was the compression, but not by much at all. you can change this by a. getting new hi-comp pistons, i think you may be able to by shaving the head. c, if there may be something else i dont know of.
This is correct, so if you want that one or two hp diff. Then shave the heads. That is the difference between the two. Its not a big gain unless you want that 10th of a sec gain for drag racing or racing in general.
 

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I have a 01 gsxr 750 and I noticed the 02 and up models are rated at a higher horsepower. I wanted to know how the increase was made and can I do it to my bike. I know the newer ones have higher compression. Is this the only difference and is it made with different pistons or with the head. Maybe it’s a totally different engine or something that I can change with a power commander. Any input would be helpful.
All in all the higher compression you have the more hp gain you will get, ask any certified mechanic not your cousin or neighbor down the street that occasional does minor work on engines. As stated by Mister Tee there are errors that are allowed when doing a dyno. But as I stated before its only gonna be 1-2 and if really lucky 3 hp. You can also port and polish, which is highly recomended to let the flow of of fuel in and air flow out. But you do not want to do this until you have headers and exhaust. But if you do all of the port polish and shave you really wont show a diff. until you get your exhaust. So its gonna get a little pricey if you havent done the exhaust. If you do all of that you will more than likely get 15 hp.
 

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I have a full yosimura exhaust and a k&n filter. I think a Power comander is next. Maybe I will get some head work done after this riding season. Does anybody think that velocity stacks are worth the price?
You can buy the stock ones and cut them yourself and get close to the same performance without paying for the high performance ones. It will will give you more pull in your mid-range.
 

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Discussion Starter · #12 ·
You can buy the stock ones and cut them yourself and get close to the same performance without paying for the high performance ones. It will will give you more pull in your mid-range.
How is this done? I know that there are rubber ones already in there. Do I just cut those down? What are the specs on it?
 

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How is this done? I know that there are rubber ones already in there. Do I just cut those down? What are the specs on it?
I will have to check into it. I found it on another forum, so I will get the information. But I do remember they said that it was hella cheaper to buy the stock ones and cut them down to size. And when they did cut them I believe it was the middle two down to 47 mm. But dont quote me on that yet. I will find the real info and not just my guess. I know its close to what I said, but the measurement is kinda if'ie.
 

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K it took a little while but you can play with which one you want to cut. The best performance is the middle two to cut down to anywhere from 44.6mm to 45mm should do it. Something was said about after cutting the stacks to put ?appoxy? on them to get smoother intake. I suggest you buy another set of stock velocity stacks to do this on. As far as pieces you will need, you'll have to get some longer bolts to hold the middle velocity stacks due to them now being shorter.

This is what I have gathered on it. So when you buy the stock version and do this you are saving alot of mulla and still getting the same increase as the aftermarket ones.

If anyone is interested, I seen the dyno's for different lengths and I am trying to figure out where to get them or just figure out how to copy their dyno's and move them over here.
 

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Discussion Starter · #15 ·
K it took a little while but you can play with which one you want to cut. The best performance is the middle two to cut down to anywhere from 44.6mm to 45mm should do it. Something was said about after cutting the stacks to put ?appoxy? on them to get smoother intake. I suggest you buy another set of stock velocity stacks to do this on. As far as pieces you will need, you'll have to get some longer bolts to hold the middle velocity stacks due to them now being shorter.

This is what I have gathered on it. So when you buy the stock version and do this you are saving alot of mulla and still getting the same increase as the aftermarket ones.

If anyone is interested, I seen the dyno's for different lengths and I am trying to figure out where to get them or just figure out how to copy their dyno's and move them over here.

I read some of the other post and they said you could just buy the stock short ones for about 15 bucks each. From what I gathered they dont really add any horsepower they just move it to somewhere else in the power band. Thanks for your help I appriciate it.
 

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I read some of the other post and they said you could just buy the stock short ones for about 15 bucks each. From what I gathered they dont really add any horsepower they just move it to somewhere else in the power band. Thanks for your help I appriciate it.
Depends on which variation you use. Not only the variation but the bhp will only be at the top end, or at least that is what I have gathered from this dyno.
Blue is stock setup with 2 short and 2 long
Green is all 4 long
Red is all 4 short
All are mapped
4 short definately the way forward
 

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The facts

didn't they switch to FI in 03?
The 00-03 750s are all the same just different color schemes. All are fuel injected, 02 and up do not have the idle enricher. No two dynos will give you the same HP ratings. The 00-05 750s have the low and mid range punch that the newer 750s do not have. AND the older 750s are lighter in weight.:thumbup:
 
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