TOPIC:

Ok, that's enough on that subject, now let's get back to the main topic. Editing posts is a pain, so let's not go there.

Back on topic, the GPz750 Turbo cams are the same lift and duration as the KZ650 cams, and I'm sure there is a 650 owner that would be willing to swap cams with you, an added bonus is that the 650 cams have a tach drive gear while the 750 Turbo cams don't.

My ECM has analog tach output allready but im interested in the turbo cams.

Kool wrote:

My ECM has analog tach output allready but im interested in the turbo cams.

650 cams are easier to find, and the only difference is that they have the tach drive gear, and even though you don't need it, it won't hurt anything.
I see 650 cams on eBay listed as Turbo cams fairly often

I'm just offering suggestions on how to do it cheaper, I'm a well known cheapskate, I hate to spend a dollar when I can do the same thing for ten cents

Post edited by: steell, at: 2006/11/30 22:12

I would still like to some compressor maps for this IHI turbo you speak of, just for my reference. Honestly if you don't want to listen to what i have to say, fine, I'm not trying to be a jack ass, but i honestly cant see a reason for two turbos on a 750 that will make 150 hp at the most hell a tdo4h-9b of a twin turbo stealth would support that if it weren't for it having a water cooled center section.

by the way it isn't a simple hydrolic brake dyno..

maybee you can send us some scans of the power curve of your turbo 750 on your dynos that you have built.

150 hp at the most from a turbocharged 750 motor? You haven't seen or read the posts about Lorcans 234 rwhp GPz750 Turbo?

If I recall correctly, his best mph so far is 211

Check out the 750turbo.com link that I posted above and see what a 750 Turbo is capable of.

130 with a wiring mod to a stock one "race mode"

steell wrote:

Kool wrote:

My ECM has analog tach output allready but im interested in the turbo cams.

650 cams are easier to find, and the only difference is that they have the tach drive gear, and even though you don't need it, it won't hurt anything.
I see 650 cams on eBay listed as Turbo cams fairly often

I'm just offering suggestions on how to do it cheaper, I'm a well known cheapskate, I hate to spend a dollar when I can do the same thing for ten cents <br><br>Post edited by: steell, at: 2006/11/30 22:12

tighter than two coats of paint is the word of heard! hey,whered all my posts go?

steell wrote:

150 hp at the most from a turbocharged 750 motor? You haven't seen or read the posts about Lorcans 234 rwhp GPz750 Turbo?

If I recall correctly, his best mph so far is 211

Check out the 750turbo.com link that I posted above and see what a 750 Turbo is capable of.

i think hes saying 150hp is the most with 5 lbs of boost and without a bunch of high end parts. to be fair lorcans 234hp is the result of a lot of years of trial and error and expensive experimentation which is definately saving the rest of us a lot of headaches by him having sorted out a lot of the dos and donts for us.

wireman wrote:

steell wrote:

150 hp at the most from a turbocharged 750 motor? You haven't seen or read the posts about Lorcans 234 rwhp GPz750 Turbo?

If I recall correctly, his best mph so far is 211

Check out the 750turbo.com link that I posted above and see what a 750 Turbo is capable of.

i think hes saying 150hp is the most with 5 lbs of boost and without a bunch of high end parts. to be fair lorcans 234hp is the result of a lot of years of trial and error and expensive experimentation which is definately saving the rest of us a lot of headaches by him having sorted out a lot of the dos and donts for us.

Exactly. A GPZ750 Turbo is a completely differn't animal than a run of the mill kz750. I would say that 150 would be about the most anyone could ever hope for on a pretty well stock 750 longblock before you start scattering parts. Unless the original poster gets crazy with a ported head and fancy cams, at 5psi I doubt it will make over 85hp in fact some quick calculations say that if it was n/a, and it could attain 100% VE at 9000 RPM it would use 8.3 lb/min of air which would be about 83HP. Now with 5psi of boost it should consume 11.1 lb/min meaning 111 hp should be possible. But the turbo's restriction on the exhaust side and the fact that it is a 2 vlave head will keep it around the low 90's at best, if he can keep it out of detonation. seeing as this is going to be in a quad chassis or somthing, I am guessing he will have problems with cooling and therefore will have to run a very conservative tune to stay out of detonation, thereby limiting actual power to about 85hp and maybe as low as 75hp.

Still waiting for compressor maps. I speculate that just one of the turbo's your trying to use will be slightly on the big side...

the 750 turbo isnt that different, some oil passage differences, 650 cams, lower comp pistons, FI. they use the same crank and the cases are very similar to the kz750 and 650
a stock kz750 puts out around 74 hp at the crank, with 5 psi of boost, it should make more than 85
my $0.02
Scott

im not sure of the differances between the turbo 750 and the non turbo version.im just saying that without doing a lot of porting and other higher end mods you are only gonna squeeze so much out of any motor .130 hp out of a small motor with only 5 lbs of boost without a lot of fancy stuff is pretty impressive to my way of thinking,hell anytime you get more than a true 100hp at backwheel of one of these old bikes its a handfull no matter what anybody else says!

77KZ650 wrote:

the 750 turbo isnt that different, some oil passage differences, 650 cams, lower comp pistons, FI. they use the same crank and the cases are very similar to the kz750 and 650
a stock kz750 puts out around 74 hp at the crank, with 5 psi of boost, it should make more than 85
my $0.02
Scott

Ideally yes it would make over 85 at the crank but in the real world thats about all it will make. That 74hp figure is not very realistic, thats a number kawasaki published, and that was a bike that was factory preped to make power, an average 750 will be lucky to make 65 at the crank. 5 psi should add a little less than 33% more power to the engine on a very well tuned setup. This being aircooled and 2 valve i would expect to see about a 25% increase at the most which would put it at 81hp if it made 65 at the crank or 93 if it made 75. so regardless it is going to be in the 80 - 90 hp range.

I do belive that a 750 turbo has a nitrided crank which will make a big diffenece in the durability of a turbo motor.