83 gs750e build thread

[jwhelan65]

Im not certain that bike is capable of that speed, and if it is my concern would be stability. Have you ever gone 150 on a bike? It is a whole new dimension. I have done it several times on my FZ1, but have no desire to push my 700 to that speed on a set of bias skinneys. Good luck and be careful!

 

[reddirtrider]

Im not certain that bike is capable of that speed, and if it is my concern would be stability. Have you ever gone 150 on a bike? It is a whole new dimension. I have done it several times on my FZ1, but have no desire to push my 700 to that speed on a set of bias skinneys. Good luck and be careful!

I agree. I've gone over 150 and these 750's aren't going to do it without a LOT of mods. The problem is that wall of air you've gotta push, it takes quite a bit of hp without a decent full fairing as you see on the modern sportbikes.

 

[tarzanscot]

Here is a little scale action

Here is a little scale action

Front caliper with braket 2.141/8 lbs x2
horns both with brakets 1.4 3/8 lbs
rear caliper stay arm 297 grams
front fender brace 590 grams
anti-dive unit one 284grams x2
both foot pegs and mounts with bolts and sheilds 3.5lbs
instrument cluster mount 236 grams
vance and hines baffle insert with bolt without packing 579grams
left handlebar with wiring with cluch lever 801g / 1.12lbs
right handle bar with master and lever 1.15lbs
suspension rocker arm 1.6lbs with bolts
chain guard with bolt 394grams

 

[oshanac]

How accurate are our old gauges +/- 15 mph or more at top end?

 

[cyclefvr2]

well guys my cycle magazene says they did 131 mph factory!, im sure with some mods it would do it , compression is a big factor stock they only have 9.6:1
here are a couple pages for referance straight from those days
bikes these days have 12-14:1 easy
a big bore kit,and good cams would be sweet

 

[cyclefvr2]

here is a nother pic, i cant put them all on one sorry

 

[cyclefvr2]

pics for ya all

pics for ya all

one more pic i have one more other than this

 

[cyclefvr2]

last pic

last pic

this is the last one, this is out of the service manual i have shows the compression ratio, and its low compaired to other bikes
maybe i can give the magazene lol its old has opages missing ,but it has the zuk in it still anyonw want it?, just pay the shipping n its yours

 

[reddirtrider]

well guys my cycle magazene says they did 131 mph factory!, im sure with some mods it would do it , compression is a big factor stock they only have 9.6:1
here are a couple pages for referance straight from those days
bikes these days have 12-14:1 easy
a big bore kit,and good cams would be sweet

The difference between 131 and 150 is huge. Personally, I think you're underestimating the challenge, but by all means give it a try.

 

[reddirtrider]

Hummm I've owned a lot of bikes and have many up over 140-150 and to say this bike won't go over 120 is @!$@# With a bad clutch last year I had mine over 110 in 3rd and still had 2 to go. And yes I was racing a Nissan Maxima and yes It was my maxima so I'm really sure it was accurate.

Most cars/vehicles have optimistic speedometers. They're built in by the factory so that you don't get a speeding tickets when traveling at the indicated speed. Have you tried using a GPS to validate your speedometer?

 

[tarzanscot]

Thats my plan ill take 2 gps's with me and they both can record the max speed traveled,
also will have a video.

 

[cyclefvr2]

the tscc is still used today , same design motors, so whats the differance in the gs16v and gsxr16v motors?? cams, compression,tranny,is a lil diff, but for performance where is all the power gained in the 00-09 models??
compression,cams,valve springs
you can make up speed by different sprockets, smaller front ,and smaller rear will make a big differance

 

[posplayr]

The difference between 131 and 150 is huge. Personally, I think you're underestimating the challenge, but by all means give it a try.

We wont mention that 150 mph requires 50% higher hp than 131 mph; I'm sure he will get there if he adds some pods, maybe a Dyna S will get him there; Couple that with the 1/4 throttle mod he will do it for sure

 

[jwhelan65]

We wont mention that 150 mph requires 50% higher hp than 131 mph; I'm sure he will get there if he adds some pods, maybe a Dyna S will get him there; Couple that with the 1/4 throttle mod he will do it for sure

It also requires some big kahonies on bias tires..

 

[Roger P.]

Ninja 900 would break 150mph with 113hp at the crank. On bias tires.

Getting that kind of power out of a GS750 will require some lumpy cams and carb work, but it might be possible. It might not be very streetable though.

 

[posplayr]

Ninja 900 would break 150mph with 113hp at the crank. On bias tires.

Getting that kind of power out of a GS750 will require some lumpy cams and carb work, but it might be possible. It might not be very streetable though.

It is really about aerodynamics not hp at these speeds. If you want to take a stock GS750 from 131 to 150 the easiest way is to put on a full fairing. As an example, to drop the drag coefficient from 0.8 down to 0.53 would compensate for the 50% increase in horsepower otherwise required. With the 1/1.5 reduction in drag, there are no other changes to the engine required.

On the other hand, tires might start to become an issue.

 

[Griffin]

the tscc is still used today , same design motors, so whats the differance in the gs16v and gsxr16v motors?? cams, compression,tranny,is a lil diff, but for performance where is all the power gained in the 00-09 models??
compression,cams,valve springs
you can make up speed by different sprockets, smaller front ,and smaller rear will make a big differance

First of all, modern GSXR engines have nothing in common with the GS700 engine, other than they are inline fours made by Suzuki. After that, the similarities end.

thanks glad u like , well i raced a eclipse gst (turbo) , and i was stock before i started any
work on it and i was holding 140-45 give or take (dont know how accurate the spedo is but it held that speed and you could'nt give it anymore there was just no more power. i will be taking a video soon either on here or a link to you tube.

Secondly, if you wanna go 150 mph on a GS700, you've got a lot of work to do, and you'll spend thousands of dollars to do it.

This GS700 -

Made 102 BHP at the rear wheel, and topped out at about 150-155mph with a 155 lb rider.

It also was notorious for eating up transmissions, and the entire engine needed to be torn down and rebuilt after every race.

Good luck.....


Edit: One other thing about your 140 mph claim on a stock GS750 - no way. With stock gearing, you'd have to be spinning about 12,800 rpm in 5th gear. Can't be done. Period. No way, no how, nope.

 

[reddirtrider]

It is really about aerodynamics not hp at these speeds. If you want to take a stock GS750 from 131 to 150 the easiest way is to put on a full fairing. As an example, to drop the drag coefficient from 0.8 down to 0.53 would compensate for the 50% increase in horsepower otherwise required. With the 1/1.5 reduction in drag, there are no other changes to the engine required.

On the other hand, tires might start to become an issue.

This is it in a nutshell. In an earlier post I mentioned that the wall of air you're pushing at 150 is tremendous. I had my ZRX1200R near 150 (my speedo said 155) and shut it down as it was getting too dangerous on some South Dakota backroads. It might have gone a bit faster, but not too much. It has pods, jetting, pipe, and a few other mods mostly cosmetic and it'll rip any GS750's wing off. Yea, I know blasphamy but I've ridden some and built one so I'm speaking from experience.

I also estimated you'll need 110 - 120 hp to get to 50 on the 750. I think you're also in the ballpark on your figure Pos.

 

[reddirtrider]

the tscc is still used today , same design motors, so whats the differance in the gs16v and gsxr16v motors?? cams, compression,tranny,is a lil diff, but for performance where is all the power gained in the 00-09 models??
compression,cams,valve springs
you can make up speed by different sprockets, smaller front ,and smaller rear will make a big differance

The only thing you wanna do with sprockets is figure out at what RPM you're making the most HP and gear the bike so you do it at your maximum speed. There is a minimum size for the front, I'm not sure what it is for the 750, but if you go too low the chain must pivot too much and that ain't good at speed.

Lots of differences, from combustion chamber to head port angles to cam timing. The entire motor has been reworked. Some subtle changes, some not so. They all add up to a big difference.

 

[posplayr]

This is it in a nutshell. In an earlier post I mentioned that the wall of air you're pushing at 150 is tremendous. I had my ZRX1200R near 150 (my speedo said 155) and shut it down as it was getting too dangerous on some South Dakota backroads. It might have gone a bit faster, but not too much. It has pods, jetting, pipe, and a few other mods mostly cosmetic and it'll rip any GS750's wing off. Yea, I know blasphamy but I've ridden some and built one so I'm speaking from experience.

I also estimated you'll need 110 - 120 hp to get to 50 on the 750. I think you're also in the ballpark on your figure Pos.

The estimate is a little on the high side, as it represents the increase in hp required due to frontal area drag. Frontal area drag required hp that increases to the 3rd power of velocity. Any internal drag terms such as engine drag or to the extent that rolling resistance do not increase to the square of velocity then all drag components do not contribute to the 3rd power rule.

Hp = Force x velocity
C x V^2 x V = C x V^3

However it was interesting that Chef and I were BSing one day and used the formula to estimate the horsepower and top speed of the world record holding busa and then related that to KrisV's nitors/turbo 1150. I don't have the figures but the conclusion was that the model worked well to predict top speed/hp requirements. It ignores gearing and RPM obviously.