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Author Topic: Jims 120 mods  (Read 1151 times)

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GMR-PERFORMANCE

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Jims 120 mods
« on: November 20, 2007, 10:35:13 AM »

We had a vendor in NY that wanted to hop up a customers Jims 120. Overall it ran as most do making near or right at 1 per cube. We swapped in a 62 cam and a welded head package. Other than that nothing else was touched. The customer is not willing to remove the pro street pipes so he gave up some power there and lost the low end tq curve. But overall not bad for increases in power.
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Re: Jims 120 mods
« Reply #1 on: November 20, 2007, 10:38:30 AM »

Hmm let me try a larger sheet
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Twolanerider

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Re: Jims 120 mods
« Reply #2 on: November 20, 2007, 10:42:27 AM »

Steve, Dennis has written before that while the tuning skills are excellent Joe's dyno might be a bit "happy" where the numbers are concerned.  Is the estimation here that the numbers are engine, dyno or a mix of the two?
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Re: Jims 120 mods
« Reply #3 on: November 20, 2007, 10:42:44 AM »

A Jim's 120 is a good place to start!


Tman heads, Tman cams, Tman pistons, 56mm-HPI-T/B, SuperTrapp 2 into1, SERT.

140.9 H/P
141.1 T

From a "B" motor with a 280 tire and a 6 speed.

 :nixweiss:
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Re: Jims 120 mods
« Reply #4 on: November 20, 2007, 03:22:32 PM »

Well I do not own his dyno and really would need to see the numbers from 3 dynos side by side. I have taught the dyno tuning class and had 3 250I in one room and they all read different. So really it is just a tool nothing more. That dyno sheets show what the engine made at that time with out any correction. So you are getting raw data not correct to sea level temp etc.  Latus reads in all STD and 5th gear pulls as well so it is anyone guess really. You can have a blue bird day to make power and that is going to show a very good sheet. I look more for kits that are close as to parts and with dyno sheets from several tuners. If you see a trend of the pwoer being close then you have a winner. Many of our sheets are from all over the US and the kits make close power so that makes us happy. now when you look at a sheet and the numbers "seem" too good well maybe there are or maybe not.   At end of the day if the bikes makes more power and the customer is happy then job well done.

I have ridden 110/110 kits that are a dog, and a kit that makes 100/100 that will smoke the bigger producing kit. How the engine revs, ie how hard it pulls will make huge seat of the pants feel. 
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