BC

Oh, but Lag, then it would have sold better, they would have continued production, and it would be 40k for an 89S4 instead of 17k.

How is your fuel curve Lag?

Warren928

Laughlin,

Does anyone have 1/4 mile and 0-60 on the boosted 928's?

Just from doing the 1/4 mile calculator, it estimates 11.5 in the 1/4 mile, do you think thats high or low? A stock Yamaha R1 runs 10.4, I am pretty sure. I am pretty sure the R1 would take a boosted 928 off the line but as you have proven, a rolling start could prove to be the superbike suprise race.

Lagavulin

Unfortunately, the dyno we used must have a whacked out air/fuel meter as it showed me below 10:1 in the midrange. However, according to my gauge, it’s spot on.

Because of the fuel delivery issue at higher boosts, those guys in Green Bay are going to install exhaust gas sensors on each cylinder so that they can see how each individual cylinder is behaving, versus the overall average provided by a single O2 sensor. Doing this will allow them more options to tune each cylinder individually.

Those guys keep pushing and pushing and pushing, and will not stop; I feel very fortunate to be part of the group!

Not yet although Z does have a brand new Gtech Pro Competition(?) that we were going to play with this past weekend, but never got around to it. We’ll definitely post whenever we get some numbers whether it’s at the track or the Gtech.

I would have to say that sounds too high since I know of a stock Z06 that’s cutting 11.5’s. Of course, that’s with a great driver too.

I agree that the results would not have been the same from a full-stop. I would have trouble launching without wheel spin, plus overcome the inertia of 3600+ pounds sitting at rest. But he would have problems too keeping his bike straight unless he’s a very good rider.

I was lucky the opportunity presented itself like it did out on the highway, but you take ‘em as they come.

If you look at the second link I provided and scroll near the bottom, it’ll show that the earlier YZF’s did 10.22, and the later one’s 10.36; that’s scorching, and there's no way I could come close to matching that!

At least not yet...

BC

Sitting....Well, Laying under my 89S4 a few nights ago taking the clutch bolts off for the first time so I can pull the engine, I noticed that there are some nuts on each exhaust port. I assume that these are parts that would be easily adapted to this process....

That gives me an idea!

bcdavis

Off the line, in a typical "drag race", the bike will have a pretty awesome launch.
Some stock bikes are pulling 0-60 in 2 seconds or so...
So it is hard to beat that kind of power to weight ratio.
So in most drag races, even if the car has superior power, and aerodynamics,
it is still hard to catch up, when a bike gets such a head start...

As soon as you get into the triple digits on a bike, or a roll-on race on the freeway,
aerodynamics play an important role. Few riders know how to get their bodies into
proper position. Even so, it is hard to get a bike over 200MPH. They are not very
aerodynamic. So if the Devek white car can pull over 200MPH, I would guess many
of the supercharged 928s will be capable of that or more... So yes, a bike can
accelerate pretty fast. But once you and the bike are both pulling 70-90 mph,
and you hit it, the bike has to push a poorly aerodynamic body through the air...
The 928 is pretty slippery, and if it is supercharged, it has a lot more power
to push with. It takes a lot of horsepower to overcome the force of the air.
So a car with a lot of horsepower, and good aero, will do a lot better at a
high speed race, than a bike. Even so, a stock ZX-9 can do the quarter mile
in 10 seconds (9.97) on stock rubber, etc... And the Hayabusas top out at
over 200MPH. So unless you have one of those supercharged beasts,
avoid racing the 2 wheelers, unless you want to be humbled...

Z

You're kind of overlooking one thing Rufus. That 500+hp that's been mentioned for these supercharged 928s is the rear wheel horsepower. The 220hp and 70% figure for the GTS you were using as a comparison are crankshaft horsepower. The crankshaft horsepower of the supercharged 928s mentioned is around 600 or more, and should be what to use when comparing to those numbers for your car and the GTS that you used. So the supercharged cars have around 100hp more than you even thought they did when looking at your car's and the GTS' numbers

No, not yet. I do have drag racing simulation software that allows input of an actual dyno chart, vehicle weight, frontal area, drag coefficient, weather conditions, tire size and type, transmission type and gearing, differential gearing, and aggressiveness of the launch and shifts. I entered the information for Tim's car along with his dyno chart a while back. The program calculated the results as 0-60 in 3.359 seconds, 0-100 in 7.415 seconds, and the 1/4 mile in 11.175@122.6mph. That's with a "professional" driver, and high performance street tires. Don't ask me how accurate that actually is, but that's what the program says.

As has been mentioned already, off the line I'd expect the results against the bike to be different than they were. I think one of the reasons the guy on the bike did finally let off when he did was because he was starting to get closer to his top speed, and saw that it was pointless to continue. On the other hand, we had quite a way to go before reaching our top speed.

The White car did have some aerodynamic improvements when it did that, like removing the side mirrors, taping the seams, a front air dam, and possibly more stuff that wasn't as easily apparent. Top speed is also dependent on the amount of power the engine is making at the RPM required to go that speed. In other words, if the gearing is such that at 200mph the engine would be at a point in it's RPM range where it's not making enough power to actually push the car through the air that fast, you'll never get to that speed. The top gear transmission and differential gearing was the same in the white car as it is in the supercharged ones. The Devek catalog documents the white car being clocked at 205mph in 1998, and shows a dyno chart for the white car from about a month after that. At around 6,000 RPM, Tim's last dyno chart shows him making over 100rwhp more than the white car was making back then.

Drewster67

I was going to put down something very similar regarding Bike Vrs SC 928.

From a dead stop - a Blown shark would have a most difficult time catching a bike. From a roll, thats a different story.

I have yet to be beat on my F3 from a stop - A Z06, Turbo Supra have nothing on my bike. Two of the cars I went up against (Time and Place remain confidential)

The Hayubasa is the fastest production bike out, pulling quarters in 9 seconds and a top end in excess of 200 MPH. One article I read stated a possible TE of 220 mph. I have a feeling if the shark in question went against that bike, there would of been a different outcome. No offense guys -

Still, that is an amazing event (SC slamming a SB) that should go recognized and I give my standard BOO- YA! and 2 thumbs Up!. Way to go guys! I only wish I was there!

Peace

Z - Cool Avatar - how did you make it (Application)? TIA

bcdavis

Exactly.

That's why I am guessing that those cars should be able to top 200,
and it is hard for a bike to go that fast, unless the rider is really good.

When they did top speed testing of some of the new superbikes,
they were getting numbers of 175-185, until the rider figured out the
proper way to position his back, and then they got over 200...

Drewster67

When I do/did my high speed runs there are a couple of things I do/did

Tighten the steering damper (On my Old Bike)
Lay my chest flat on the tank
Pull my feet back onto the rear sets (On my Old Bike)
I tuck one arm behind my back
On my throttle arm, I tuck my elbow into the gas tank.


If you think about - If in 87/88 a shark reached 170 mph - 200 mph is easily doable with a supercharger. I don't have a doubt what so ever.

Peace

Z

I made it with GIF Construction Set Proifessional, by Alchemy Mindworks. Reducing the size and compresing it to be able to upload it to the board degraded it though. The actual animated GIF looks much better. On there the wheels turn faster, the white stripes on the road zip by, and it's clearer and not so grainy.

Tony

Ya know what is really scary about the work these guys do up in WI/IL?
Its not even winter yet!

God forbid if they sit around in a heated garage with Lienenkugals and deep fried cheese curds tweeking and thinking of more HP refinements!


The nice thing about this HP they are developing is that it is only there when you need it.

Cruisng along the intersate...NAAAaa

On the way to Home Depot...NAAAaaa

Being bothered/challenged by some rice or other domestic pest.....ya NAIL IT! burnout:

Keep up the great work guys!

hacker-pschorr

Only when I run out of Hacker-Pschorr do I switch to Lienenkugals!!

BC

Hacker-Pschorr - cheap austrian beer?

Lagavulin

None taken as your 'speculation' is realistic and can be considered the truth which is always appreciated!

Yep, if it were a Hayabusa, the story probably would have gone like, well, I hung tough with him for a while.... ahem!, uhh, ...well, ok, that's when we were waiting to start, ...and then we're off and he was gone; doh!

The one regret I have is that I didn't think to pull off at the next exit so that we could've talked to the rider and his buddies. Imagine how that would've been!

I know he wasn't pissed about the race or else he wouldn't have done a stand-up power wheelie after I gave him thumbs-up. I would have to guess that more than likely, he was impressed that a car could do that to him, and probably for the first time; I know I would be if I were him.

But I must say that even after the 30 miles back to Tim's house, my heart was still pounding in my chest from the excitement as we stepped out onto the driveway; I just couldn't think straight. Those who know me would probably say, so, what's new? I'm glad my buds put up with me!

I wish I knew if he posts on a YZF board somewhere, and reported our event.

hacker-pschorr

BrendanCampion - You have a PM.