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Power to the people
Posted: Mon Nov 16, 2009 4:40 pm
by tz375
Anyone got any dyno charts for TR or GT750?
I need a starting point for the work I'm doing on a motor and don't have a "before" chart or anything to compare to.
I know that the claimed 67 or 70 HP was more like 58 on a good one at the rear wheel, but not too many charts out there to compare notes.
Thanks
Posted: Mon Nov 16, 2009 4:49 pm
by Tom Garcia
Posted: Mon Nov 16, 2009 5:40 pm
by tz375
Yes, thanks Tom, but I wanted TR or GT charts.
Posted: Mon Nov 16, 2009 6:05 pm
by Tom Garcia
Sorry...gotta get new glasses...
Posted: Mon Nov 16, 2009 9:45 pm
by ja-moo
Just divide the TZ by 2.......
Sorry, I couldn't resist.........
Posted: Mon Nov 16, 2009 11:26 pm
by tz375
John,
That's not far off. TZ750 makes about 120 /2= 60 , but on a good day a stock GT750 makes more like 48-50.
I was interested to see what some of the dyno charts look like in terms of power spread at lower revs for example as much as to see what HP people made.
Posted: Tue Nov 17, 2009 1:19 am
by rngdng
Here's one of Blueboy with stock carbs, pods and Jemcos. No major engine work at that time. Hope it helps.
http://www.3cyl.com/rngdng/Dynorun.pdf
Posted: Tue Nov 17, 2009 3:32 am
by Craig380
Lane,
that's a very nice, linear power curve, and 60+ at the wheel is pretty damn good ....
Posted: Tue Nov 17, 2009 6:49 am
by rngdng
Craig380 wrote:Lane,
that's a very nice, linear power curve, and 60+ at the wheel is pretty damn good ....
I don't have the printout from the later run with the lift-plate, and 34s, but it hit 79+ with a similar power curve. A little more pipey, but very manageable.
Lane
Posted: Tue Nov 17, 2009 8:53 am
by tz375
Thanks Lane, That's a very smooth curve.
Of course we can't really compare one dyno chart to another, but yours is looking really good.
I found one on the UK site and that bike made 46.8 stock and 53.9 with Allspeeds/Gibsons after jetting. they were happy with the 10% improvement.
Suzukidave had a quick and dirty dyno run on the yellow GTXR with pods and Bassanis and I think it made mid fifties which is about right. I don't think he had a graph though.
It all helps to build a body of knowledge.
