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Sportster Motorcycle General Discussion and Problems For discussing problems about your Sportster motorcycle that don't fit anywhere else.

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  #1  
Old 25th April 2011
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Default first time to the track...

Well my brother was making my his debut run in his 1973 AMC Gremlin at the local drag strip after a recent rebuild. So, I took the Sporty down to watch and decided to go ahead and run it... This was my first time. So, I wanted to get some opinions on my times.

Drag strip: 1/8 mile (Macon/Twiggs National Dragway, Twiggs county, GA)

Bike: 1998 XLH 883 with 1200 9.5:1 compression ratio conversion kit w/ stock 883 heads, Bassani Pro Street exhaust, CV Carb jetted properly, Hyper charger, points instead of Electronic ignition (long story).

6 run average times:

60ft: 2.271
330ft: 5.895
594ft: 8.423
1/8: 8.999

Avg MPH: 78.133

Just wanted to get some opinions on how these numbers look.

Either way I had a blast it was just a test and tune night and I don't really intend on going into competition unless it's with myself LOL.

Thanks,
Jett
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  #2  
Old 25th April 2011
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Need to work on that 60 foot!
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Old 25th April 2011
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yeah I was really nervous about pulling a wheelie and loosing it, so I was hesitating and stumbling a little bit off the line. They aren't stingy with the VHT at this track!!!
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Old 25th April 2011
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Yeah, that sixty is dismal.

But, I'm not sure I'd so any better....

Still, for reference, my '69 Valiant would rip off consistent 2.21X second short times on a sh***y track (Bremerton WA) that was more like a city street. This was with old, old E60-14's, pinion snubber, stock springs, and slant six torsion bars.

So, on the bright side, you've got a lot of easy time to pick up!

BTW, can these bikes wheelie? I'm not sure mine will unless I do something so aggressive that I'd be afraid to break that rubber band between the trans and rear wheel.

-Bill
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Old 25th April 2011
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Quote:
Originally Posted by thecarfarmer View Post
BTW, can these bikes wheelie? I'm not sure mine will unless I do something so aggressive that I'd be afraid to break that rubber band between the trans and rear wheel.

-Bill
I never have deliberately pulled a wheelie on my Sportster (my dirt bikes, sure), but just a couple weeks ago I hit second gear aggressively and rode a wheelie for about 15 feet. Really surprised me ... I guess all the elements just came together without me realizing it.
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Old 25th April 2011
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Quote:
Originally Posted by thecarfarmer View Post
BTW, can these bikes wheelie? I'm not sure mine will unless I do something so aggressive that I'd be afraid to break that rubber band between the trans and rear wheel.

-Bill
The first run I made I picked the front end off the ground off the line and when I shifted into second.

I have done it before on the street too.

Does anyone have any times to compare it to?
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Old 25th April 2011
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Originally Posted by jettman96 View Post
The first run I made I picked the front end off the ground off the line and when I shifted into second.

I have done it before on the street too.

Does anyone have any times to compare it to?
COOL! I suspect I've just been riding my bike like a pussy...

-Bill
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Old 25th April 2011
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do you know what rpm you're leaving at? I know what 60ft times my cars pull on a prepped surface. Just remember that a good rule of thumb is every .10th off on your 60 ft time is nearly .30th off overall(atleast in a 1/4 mile track anyway)
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Old 25th April 2011
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It's mostly in the first sixty feet. That is where you'll cut your time the most. Just keep working on the launch. You'll get it. Also recommend you get rid of the Hypercharger, they're all looks no go.
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  #10  
Old 25th April 2011
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Quote:
Originally Posted by pat_tm View Post
do you know what rpm you're leaving at? I know what 60ft times my cars pull on a prepped surface. Just remember that a good rule of thumb is every .10th off on your 60 ft time is nearly .30th off overall(atleast in a 1/4 mile track anyway)
Unfortunately, no. I've never really needed a Tach before now. And this has made me consider getting one. I'm not sure I was making the most efficient runs because I normally ride with a half helmet on the street and shift based on feel/sound. But with a Full face helmet I couldn't hear the bike as well.

A Tach may be a must for the next go around. Any suggestions on a small tach for my bike?

On a side note, I am barely shifting to 4th by the time I get to the 1/8 mile.
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