Author Topic: K2/K5 Drag project (Read 107069 times)

SBR-CB400F · « **Reply #925 on:** January 18, 2016, 04:50:42 PM »

Hi Trey, how did you go at the test and tune?

Adam

NalleyRacing · « **Reply #926 on:** January 20, 2016, 09:27:15 AM »

Welp.. Track was packed.. Figured it would be..

Only made one pass. Couldent hook for anything.. Slid all over the 60'.. 2.3ish.. Real bad.

But through the gears the bike had some serious power compared to the K motor setup..

Didnt know I had a small air leak and when I went to make my pass I didnt have enough air in my tank.. Missed 5th..

Gonna go back for more on Febuary 2nd.. Should be able to get a few more passes in.. Stay tuned for 12s

754 · « **Reply #927 on:** January 20, 2016, 11:18:12 AM »

What tire are you running ?

NalleyRacing · « **Reply #928 on:** January 20, 2016, 12:53:29 PM »

Bridgestone Exedra Max 130-70-18

BPellerine · « **Reply #929 on:** January 20, 2016, 02:38:32 PM »

you running the f cam or the cx1?billp

NalleyRacing · « **Reply #930 on:** January 20, 2016, 04:01:27 PM »

F cam

scottly · « **Reply #931 on:** January 20, 2016, 05:32:01 PM »

Was this the same tire you used before? How much air pressure were you running?

NalleyRacing · « **Reply #932 on:** January 20, 2016, 05:32:39 PM »

Yup checked before thr pass.. 32 in front 10 in the rear

SBR-CB400F · « **Reply #933 on:** January 21, 2016, 02:40:52 AM »

Could there have been water still on the rear tire?

NalleyRacing · « **Reply #934 on:** January 21, 2016, 09:31:30 AM »

Could be the case Adam.. I dont recall doing a particularly long burnout.. Or even getting the sides warm either.. All kinda seemes to go too fast.. First pass in a few months.. I was a bit rusty

Bill/BentON Racing · « **Reply #935 on:** January 21, 2016, 09:34:40 AM »

I smell lack of hot rubber... Hey I got video of wetting the tire and never doing any burnout at all! Sh*t happens! Lol.

754 · « **Reply #936 on:** January 21, 2016, 10:14:00 AM »

How are you holding the tire on at 10 psi ?

NalleyRacing · « **Reply #937 on:** January 21, 2016, 10:18:54 AM »

Stay screws hold the tire to the rim

dragracer · « **Reply #938 on:** January 21, 2016, 11:40:56 AM »

Quote from: 754 on January 21, 2016, 10:14:00 AM

How are you hlding the tire on at 10 psi ?

Hmm, I was thinking the same thing myself Frank. 10psi seems way too low for any type of street tire. Its likely not even making a decent contact patch but riding on the outer edges of the tire- especially when you launch. Its also taking more horsepower to roll that flat tire all the way down the 1320 and is killing your ET and mph. Time to find a better compound. But hey, what the hell do I know. I'm not the owner or rider.

NalleyRacing · « **Reply #939 on:** January 21, 2016, 01:30:57 PM »

Youd be suprised.. This tire is really hard.. 10 dosent seem to be too bad

I can usually tell by the pictures from the track photographer how much contact im getting..

Ive ran everything from 25-10.. Hooks up at 10 usually pretty well.. I wouldent mind sourcing a wider tire..

gschuld · « **Reply #940 on:** January 21, 2016, 01:45:29 PM »

For a wider tire, you'll need to think about rear rim width.

I think you will find that a tire too wide for a rim tends to pull the sidewalls in and make the contact patch nearly the same as a narrower tire that fits the rim properly. When dealing with street tires, it is usually better, ideally, to run a rear rim that is on the wide end of the rim width recommendation for the tire size you want to run. This way the tire will naturally flatten out a bit on the rim in the contact patch area.

George

754 · « **Reply #941 on:** January 21, 2016, 02:02:01 PM »

Try it at 20.just for the hell of it
Got somewhere to practice launches..

If you havent already try just just giving tire a quick spin..no water.. Just get it clean..then a few dry hops to see if its sticky... And slip the clutch..like over first 15 feet or more.. Hold it about 6-8,000 rpm, and let clutch out as much/fast as you can without breaking loose.

Bill/BentON Racing · « **Reply #942 on:** January 21, 2016, 02:51:47 PM »

Yes, 10 sounded suspect!

, Bill

NitroHunter · « **Reply #943 on:** January 21, 2016, 03:27:13 PM »

Quote from: NalleyRacing on January 20, 2016, 09:27:15 AM

Didnt know I had a small air leak and when I went to make my pass I didnt have enough air in my tank.. Missed 5th..

Just curious, how low was the air pressure, did it not kill the ignition, or just grind the 4/5 side gear teeth together?

NalleyRacing · « **Reply #944 on:** January 21, 2016, 11:05:18 PM »

If its below 100psi it wont make 5th.. Im using a hand me down shift cylinder from Kevin Drapers left over top fuel harley parts.. Overkill to say the least. Im wondering if the cylinder bleeds too much air per shift(The Harley used a 1-2 -3) or if theres another cause :/

I can foot shift through all gears though.. Feels like the split second I push the button for 5th it goes in then comes right back out

SBR-CB400F · « **Reply #945 on:** January 22, 2016, 03:14:48 AM »

Hi Trey, I am always a bit rusty

yeah it does seem to go too fast. I would suggest running the maximum tire pressures front and rear, less friction and drag

754 · « **Reply #946 on:** January 22, 2016, 11:00:16 AM »

I went thru a few years of bracket racing with no shifting problems ever... Used my foot..
And part of that time had a cast on my shifting foot...and still was winning.. A lot.. IF there was a rookie award i would have bagged it. I came second in points overall, most of the others had years of experience behind them.
But by all means continue messing with the air shifter , if you want to continue having problems.. You can not say,we did not all warn you. Several times.

TurboD · « **Reply #947 on:** January 22, 2016, 12:29:01 PM »

^ I agree, and I have made mention to this as well. It seems a like you have had a number of outings that involved air shifter problems. Now for some very clear respectful advice.. Take the damn thing off, you don't need it. A 12, 11, or even 10 second bike has NO need for a air shifter, Shift the thing and go race. I raced a 8 second turbo Kawasaki with no air shifter..

I say this with much love, I can only watch or stand by someone that needs help or advice for so long until I throw my 2 cents in.

dragracer · « **Reply #948 on:** January 22, 2016, 01:17:25 PM »

If we could just get him to replace that huge shift cylinder with a smaller one, it might make a difference. Undercut the transmission and it 'll seal the deal.

Retro Rocket · « **Reply #949 on:** January 22, 2016, 03:53:52 PM »

Quote from: TurboD on January 22, 2016, 12:29:01 PM

^ I agree, and I have made mention to this as well. It seems a like you have had a number of outings that involved air shifter problems. Now for some very clear respectful advice.. Take the damn thing off, you don't need it. A 12, 11, or even 10 second bike has NO need for a air shifter, Shift the thing and go race. I raced a 8 second turbo Kawasaki with no air shifter..

I say this with much love, I can only watch or stand by someone that needs help or advice for so long until I throw my 2 cents in.

About time someone said that clearly....

The Old 750 drag bike I bought ran in the 10's foot shifted, don't run sh1t you don't need, its just something else to go wrong...Remember the old saying K.I.S.S....

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Author Topic: K2/K5 Drag project (Read 107069 times)