Track times...Expected? 1/4 mile drag

victoRR · 03-30-2004, 1:44 AM

For those of you who kinda swing both ways with the versatility of the 929.

My best pass at a local track was 10.90/130mph. With a cleanup of the head (exhaust ports smooth and ported slightly) and a clean up of the valves. What kinda gains if any can be expected?

What times do you have? What should be average for a 200lb. rider?

G-Force Junkie · 03-30-2004, 2:55 AM

I doubt give or take 5 hp or so is going to matter much. WIth such a short wheel base and relativly skinny tire, its more about the skills in launching it. But mid 10's should be achievable.

brennyP · 03-30-2004, 3:37 AM

thats my best time also mate 10.9 sec at 130mph.. thats with the stock 954 and about 13 runs just after i got in a few months ago... once i get my mods and my skill level up a bit ill go and try and beat it... but im damn happy just to have a 10sec.. even if it is high

CBRGuy · 03-30-2004, 1:48 PM

10.55 @ 133mph, bone-stock
10.3 @ 137mph, front strapped, -1 front sprocket

sonicsbomb · 03-30-2004, 1:50 PM

Last year bone stock with a strap 10.06
last sunday 9.97 lowered and extended and straped spinning the tires top of first and most of second.

SilverBullet · 03-30-2004, 5:21 PM

10.8 @131 I think was my best, only a month ago and can't even remember, sad huh. It was the first time I had broken into the 10's. Strapped and -1 on front.

victoRR · 04-07-2004, 3:16 AM

I am going to have to try strapping the front down. What are you guys using for that? I am on stock gearing.

I guess going 1 down or 2 up in back wouldn't hurt, but I am havin a hard enough time trying to keep the front end down.

I ported the hell out of the exhaust ports and stuck some 954rr throttle bodies in there (someone told me they were slightly bigger) I didn't have a dial indicator to check though.

We'll see soon on what I can pull. Next Wednesday I will be headin to the track.

CBRGuy · 04-07-2004, 10:12 AM

Quote:

Originally Posted by victoRR

I am going to have to try strapping the front down. What are you guys using for that? I am on stock gearing.

I guess going 1 down or 2 up in back wouldn't hurt, but I am havin a hard enough time trying to keep the front end down.

I ported the hell out of the exhaust ports and stuck some 954rr throttle bodies in there (someone told me they were slightly bigger) I didn't have a dial indicator to check though.

We'll see soon on what I can pull. Next Wednesday I will be headin to the track.

You can get a strap for the frontend from www.schnitzracing.com for about $20. You'll have to use a dremel and grind a bit of the mounting bracket off so that it doesn't interfere with the caliper (I did, there may be a way around that?). It does help in launching and lets you get on the gas sooner in 1st. The bike will still wheelie easy though so be careful. You should knock off a tenth or 2 with the strap.

The best thing is to also lower the rear but that is more expensive and is a pain in the ass to do. You'll also start to run into traction issues when the front and rear are lowered.

One thing I found that made a big difference is the shift points. With equal launches, shifting just before the limiter kicked in resulted in a 10.3 @ 130mph. Same launch but shifting just below redline on the tach resulted in 10.3 @ 137mph. That's a 7mph difference by just shifting a little sooner. If you have a full pipe and good jetting you might want to shift as high as you can. It really depends on you powerband but try a couple different things out and see what happens.

victoRR · 04-07-2004, 5:57 PM

That definately is one thing I was meaning to try. Shifting a little earlier. I was close to hitting the limiter on everyshift.

I end up crossing the traps in the very top of 3rd gear. I'll try hitting 4th a little sooner. Im sure I won't lose much if there is a loss at all. I'll be heading out next Wednesday.

Does anyone on here live in the San Antonio/Austin Tx area? The track I am heading to is somewhat in between in Marion, TX. San Antonio Raceway. Maybe those who are in the area can check it out. I've been going there for at least 4 years now.

abtech · 04-07-2004, 6:21 PM

10.02 @ 139 and change. Various mods including 15/44 gearing, airbox work and O2 fuel. Basically just checking the map, but if I dropped down to say . . 15/42 or thereabouts (negating the need for 4th gear), I could probably have gotten into the nines as I had to shift about 30 feet in front of the traps every time.

victoRR · 04-08-2004, 11:22 PM

(edit) I am not sure if this is for a 929 or not, if not...disregard the following post

My first question would be, what is the stock gearing like? 16/43? Also, what type of airbox work did you do? I was thinking of using the following few ideas:

Using the fork strap (ordered)
Rigging up some sort of cold air induction
Possibly going 1 down in front.

Wouldn't going 1 down in front and down 2 in the back kinda be the same as stock? (I am still a newb to this). I know 1 down up front is like 2 up in the back. I just don't want to throw my speedo off too much. It's a little off anyway with my 180/55 tire on it now.

abtech · 04-08-2004, 11:38 PM

Quote:

Originally Posted by victoRR

(edit) I am not sure if this is for a 929 or not, if not...disregard the following post

My first question would be, what is the stock gearing like? 16/43? Also, what type of airbox work did you do? I was thinking of using the following few ideas:

Using the fork strap (ordered)
Rigging up some sort of cold air induction
Possibly going 1 down in front.

Wouldn't going 1 down in front and down 2 in the back kinda be the same as stock? (I am still a newb to this). I know 1 down up front is like 2 up in the back. I just don't want to throw my speedo off too much. It's a little off anyway with my 180/55 tire on it now.

The airbox was gutted, sealed with fiberglass and one intake was sealed as well. I insulated the box from the engine with 2 layers of glass cloth/aluminum insulation and ran a NACA duct dead center in the nose of the fairing connected with neoprene hose to the remaining intake on the airbox.

16/43 (2.69 to 1 final drive) is stock on the 929, so 15/44 is a bit lower (2.94 to 1). Dropping a single tooth up front and keeping the rear stock would seem like a very good starting point, and should negate the need to catch 4th gear in the quarter mile.

victoRR · 04-09-2004, 4:21 AM

Quote:

Originally Posted by abtech

The airbox was gutted, sealed with fiberglass and one intake was sealed as well. I insulated the box from the engine with 2 layers of glass cloth/aluminum insulation and ran a NACA duct dead center in the nose of the fairing connected with neoprene hose to the remaining intake on the airbox.

16/43 (2.69 to 1 final drive) is stock on the 929, so 15/44 is a bit lower (2.94 to 1). Dropping a single tooth up front and keeping the rear stock would seem like a very good starting point, and should negate the need to catch 4th gear in the quarter mile.

With the final drive ratio increasing, 2.69 to 2.94, wouldn't that cause me to catch 4th gear? I am banging off the rev limited now with the stock gearing. I could go +1 on the front to keep a lower gearing. Perhaps 2.3x?

I'm going to look some more into this. I'll test the bike next Wed. at the track and see how I do. I'll try shifting a little sooner and find out what I cross the traps in. I still think it'll be 3rd gear, but with a little more power, it should make up for a slight difference.

SilverBullet · 04-09-2004, 8:56 AM

I still hit 4th right before the traps with -1 up front. But I'm slower than all you guys with a best of 10.8

Cowboy · 04-22-2004, 4:25 PM

After reading all these threads about 1/4 mile times I had to give it a whirl. My bike is set up for road racing so I didn't expect to run the same times as the guys that are really into drag racing. I didn't want to square off my almost new slick so I didn't do a burn out, big mistake. I was under the impression there would be traction on a drag strip, silly me. The rear just spun and got sideways on the launch. By the time it hooked up I was way behind and tried to make up time w/ more throttle and ended up wheeling half way down the track. It was so ugly I just called it quits and coasted across the line, a 12.25 @ 92mph. Next run I warmed up the tire w/ a little burn out. This time it hooked up but I still had trouble w/ wheelies, a 10.7 @ 131. I got in four more passes but wasn't able to improve my times, equaled it though w/ an increased trap speed of 136mph. I tried lowering the launch rpm but my bike has NO midrange power and just bogged down. My reaction times were rediculously slow, I prefer the number boards and flags of road racing. All in all, it was an interesting time. I will probably go again sometime to see what my bike is really capable of when I get it right.

Cowboy · 06-17-2004, 2:20 PM

Went back out again last night for a second attempt. Spent most of the night trying to figure out how to launch the bike w/o wheeling. I get good launches at the race track, just have a hard time adjusting to the strip. My last run was my best: 10.3 @ 141mph. I was happy w/ that. Met a couple of cool people so I may go back more regularly and have some fun.

02FBlade · 06-17-2004, 7:06 PM

The strip is all about 60' times....launching skill. At my last race (roadrace) some little gixxer750 was like a bullet off the line. I was quit supprised and had to ask him were he learned to launch...he use to race dirt. I have a friend on another 750 that can launch like a bullet....it helps that he's a buck 5 wet!

abtech · 06-17-2004, 7:15 PM

I ran 250s for 5 seasons and believe me, if you can launch a 250 and lead the pack into turn 1, you can launch a liter bike at the drags . . .

roadracer319 · 06-17-2004, 7:37 PM

8.50 @ 200 mph. Special Erion Edition Only........

02FBlade · 06-17-2004, 8:52 PM

Quote:

Originally Posted by abtech

I ran 250s for 5 seasons and believe me, if you can launch a 250 and lead the pack into turn 1, you can launch a liter bike at the drags . . .

Ever since I dropped the stock gearing I have trouble keeping the front down...what's the secert to the holeshot Ab? Should I just be using my clutch more?..... not fully release until the front is completely down? I can but seems like alot of wear/abuse on it.

abtech · 06-17-2004, 8:57 PM

Quote:

Originally Posted by 02FBlade

Ever since I dropped the stock gearing I have trouble keeping the front down...what's the secert to the holeshot Ab? Should I just be using my clutch more?..... not fully release until the front is completely down? I can but seems like alot of wear/abuse on it.

Slip it until you're almost into the limiter in first and slip it about half way through second. Try to keep the revs solid while you slip the clutch. Takes a bit of practice and is hell on friction plates, but worth the effort . . .

02FBlade · 06-17-2004, 10:30 PM

Thanks for sharing that valuable information!

Can you now delete what you said so the competition don't see? j/k

BoiseRR · 06-18-2004, 6:49 AM

'00 929 with muffler and no flapper and -1 in front. Consistant 10.9's at 126/127mph. Best time is 10.90, best speed is 127.75mph but they were not on the same run. Times vary a little but speed usually stays 126ish. I am at 2500 feet elav. and weigh about 250 with full leathers. Mid 1.8's for 60ft's.

I had tried 15/45 but it would just wheelie and kill the times. Back to 15/43.

Forgot...11.0's no strap, 10.9's with strap. Made mine out of an old tie down. cut the hooks off and welded on brakets.