What can I expect to pay for 100 octane? I get my Z back tomorrow. It's been to the dealer for it's first service.

 

Since when does higher octane fuel produce power? The only thing higher octane does is prevent early detonation. As far as "cleaner fuels"- you may be on to something there.

 

Octane rating is a numerical value for the rate at which gasoline combusts. The higher the number, the slower the burn. Hence the need for higher compression to take advantage of slower burning fuels. This leads to the topic of cylinder pressure (not compression) which is rated in psi. Along with compression, cam timing (valve timing) are major factors in cylinder pressure. Ignoring extra factors such as altitude, temperature, and cylinder quench, the cylinder pressure should be your determing factor in choosing your octane rating. When using too high of an octane, the fuel burn can take too long, leading to excess combustion taking place after the exhaust valve in the pipes. Just my 2 cents, but DON'T use Avgas, the specific gravity is all wrong for ATV's, and most cars.

 

There are three versions of the DRZ engine: the basic kickstart 400, the 400E, which is electric start and the 400S, which is the one the LTZ got. The 400S goes on their on road/off road bike, has less power (34-35? Vs 38 HP) and is primarily designed to run low octane gas and get high fuel mileage.

The DRZ 400S has less compression 11.3:1 Than the DRZ 400 12.2:1. The only benefit to the putting the DRZ 400s engine in the Z400 over the DRZ 400 engine is the ability to run lower octane gas.

DR-Z400S Basic Differences from DR-Z400E.
Mikuni BSR36 CV-type carburetor Vs Keihin FCR39 carburetor.
Suzuki's web site "Reduced compression ratio (12.2:1 to 11.3:1) for operation with 87-octane fuel."

 

They should of made an option to pick either motor. That would be cool.

 

And the compression reduction is all I was talking about to allow for 87 octane. I don't run it.

I also know how much better race gas would would since racing "street legal drags" at the track. Race gas is so much more consistent and all the garbage is gone.

Let's put it this way. We went to the track about 2 months ago with a pretty strong street motor running 92 octane. This motor was way up there at 11.5:1 compression so we had the timing backed way off. There was not detonation and this was verified by the computer logging we were doing on the EFI. Then we put in a few gallons of 118 octane to mix it up and get the RON to about 109-110 octane.
He goes out there and bests his 60 foot time from 1.57 to 1.47 (best ever, bar far...this car has raced hundreds of passes on this motor), gets into third and breaks the rearend, that overrevs the motor and breaks a couple valve srpings at about 8,000 rpm. MPH was up but 2 at 1/8 mile. Power was definately there. He said it about ripped his head off on the launch and scared the heck outta him until it broke. That $5 a gallon fuel is just better stuff than the $1.50 mass produced pump stuff I think. No additives for smog and no oxygenation.

 

DEARNO24

I see you have both a Z400 and a C-dale, is the C-dale much better than the Z400???

What are your impressions???

Thanx [img]i/expressions/face-icon-small-smile.gif[/img]
LOBE
~~~~

 

LOBEEX I think that both are excellent quads. One is suited to race right out of the box. Some minor add on and shazam That would be the cannondale. The suzuki is fast and much more comfortable to ride. After a full day of riding the Dale you know it. It isn't so bad on the Zuki. But in order to get the same kind of power you have to add some cash and you still haven't touched the suspension yet. I love both quads for different reasons.

The Dale is definitely more power, but it also has more to look out for. Like faster intervals for oil changes and I make it a point to check everything before going out riding. I don't feel like I have to do that with the Zuki, but the motor snap is night and day. I look forward to adding at least a pipe and jet kit to the Zuki, because the motor is begging for it.

If you have any specific questions feel free to ask. I'll do my best to answer them.

 

Derno24 you have good taste I see....[img]i/expressions/face-icon-small-smile.gif[/img]

 

Sandgod how do you like the pipe and jet on the Zuki? Which pipe did you get? I have only seen the Yosh. You will love the remap and HMF pipe. Hope you don't have to worry about sound. PS how do you keep your quads so clean mine lok like they were through a war.