[srad6/10]

Hi I recently got a 98 750 as part of a tradeunk
I had a 600 before and still regret selling it.
since the bore and stroke is 72x46 on the 96-99 and the same on some of the later years I found that the Suzuki GSX-R 750 K4 seems to be the best for my piston/rod swap.
72 x 46 mm Compression Ratio 12.3:1
Lighter weight forged pistons with chrome-nitride-coated upper compression rings and oil control rings for a harder, more consistent ring finish and reduced friction

I'm not sure if the rods would fit in my 98 but since they are stronger it would be great to use.
This way I would get a nice set of forged pistons with stronger rods (at a good price) for my turbo bike I'm hoping to build.
I figure I should be able to lower the compression with a thicker head gasket or a spacer plate at the block.
From what I've read the Srad seems to be a great bike for turbo charging.
Mark Moisan used to sell a kit for them and at 8 Psi the bike produced roughly 200 Hp ?

Mike

 

[THE SRADIATOR]

That seems like a lot of hp with only 8psi of boost?

 

[srad6/10]

Hi yes it seems like a lot of HP I read it somewhere but can't remember exactly where so with that said I probably got the numbers wrong as well.The memory isn't as good as it used to be LOL

 

[Maj750]

The srad is a great bike to turbo, it has bigger piston pins than later 750s, heavier rods,
generally there stronger as they are
i have run std pistons and rods to 30 psi and 350hp repeatably on our landspeed bike (lots of supporting stuff to do this)
my recommendation would be to ceramic coat the std pistons, if you fit new rings file to ~.018-.020 end gap
base spacer under the cylinders, depending on boost you want and fuel you can get, a .020 -.040 spacer , i have spacers lazer cut as needed and can supply if needed or just cut your own using the gasket as a pattern
if your planning more than 15 psi use better valve springs
std head bolts are too thin , busa head studs fit if you make some spacers to replace the headbolt washers , 13mm hi, 19mm OD and 11mm ID, and cut 3 threads off the studs under the cam ball bearings
you can stack up to 4 clutch springs in the std pack if you remove the spacers to match
3 is ok for moderate boost levels
Engine management is where most usually fall down, its more important than just about all of the mods to make a motor stronger , wrong a/f at any time will eat even the best pistons o damage a head very quickly , or spit out a headgasket , and potentially damage big end bearings .
gen 1 busa plenums have the same throttlebody spacing , and are fairly readily available with secondary injectors, , a great and relatively cheap setup would be the secondary injectors driven by a microtech mt2, there is a mt2 available at the moment at a good price on the psycobike classifieds, hunting through there may even get you a plenum
it would only need the up pipe position changed to suit the srad ram air hole .
good way to roughly calculate your hp gained and this is dependant on lots of effiancy based mods , if your std hp was 120 at 14.7 psia (standard atmospheric) , then 15 psi boost should give roughly double that , less if your turbo is too small and choking, more if you intercool & or use a very efficant turbo , and usually a little better as you improve engine efficancy initially and get some free hp

 

[srad6/10]

Wow thanks for the info this was just the kind of info I was hoping to get from someone who had done this already
Also the fact that gen 1 Busa plenums will work on the bike will make this easier to obtain the parts needed.

 

[97grnrs]

i built one a while ago. it ran good and was pretty fast. but i will tell you it was a pain in the ass to build since no one makes anything for it. i had to piece everything together. i ran 8 psi on it daily and it ran good.

 

[GSXRf-F4N]

Any assistance with this would be amazing. I don't know where to start as google brings up nothing. Apparenlty MR Turbo used to do a kit?

 

[Ramon Conor]

The srad is a great bike to turbo, it has bigger piston pins than later 750s, heavier rods,
generally there stronger as they are
i have run std pistons and rods to 30 psi and 350hp repeatably on our landspeed bike (lots of supporting stuff to do this)
my recommendation would be to ceramic coat the std pistons, if you fit new rings file to ~.018-.020 end gap
base spacer under the cylinders, depending on boost you want and fuel you can get, a .020 -.040 spacer , i have spacers lazer cut as needed and can supply if needed or just cut your own using the gasket as a pattern
if your planning more than 15 psi use better valve springs
std head bolts are too thin , busa head studs fit if you make some spacers to replace the headbolt washers , 13mm hi, 19mm OD and 11mm ID, and cut 3 threads off the studs under the cam ball bearings
you can stack up to 4 clutch springs in the std pack if you remove the spacers to match
3 is ok for moderate boost levels
Engine management is where most usually fall down, its more important than just about all of the mods to make a motor stronger , wrong a/f at any time will eat even the best pistons o damage a head very quickly , or spit out a headgasket , and potentially damage big end bearings .
gen 1 busa plenums have the same throttlebody spacing , and are fairly readily available with secondary injectors, , a great and relatively cheap setup would be the secondary injectors driven by a microtech mt2, there is a mt2 available at the moment at a good price on the psycobike classifieds, hunting through there may even get you a plenum
it would only need the up pipe position changed to suit the srad ram air hole .
good way to roughly calculate your hp gained and this is dependant on lots of effiancy based mods , if your std hp was 120 at 14.7 psia (standard atmospheric) , then 15 psi boost should give roughly double that , less if your turbo is too small and choking, more if you intercool & or use a very efficant turbo , and usually a little better as you improve engine efficancy initially and get some free hp

Hi Sir I have a srad 750 96-97 you say for more than 15 psi I need better valve spring wish one you recomiend . I have a t25 turbo garrett from nissan are it to small for it? or it ok thanks iam from puerto rico.