concept carbon vs modsrx


I got a email from modsrx, hes a little bummed, however I want to mention a few key things that make all the differance in the world:
1.) no fuel meter was used so basicly you have no idea if your rich or lean!
without that (bsfc)a dyno isnt going to help with anything , bsfc is the information which tells you the amount of fuel the engine is drinking, telling you if its rich or lean and a mandatory tuning tool if you want to actually get a "tuning session". bsfc tells you if the engine on the dyno is making good trail safe power or wicked lean big hp numbers. More importantly though allows you to watch for lean parts of the engines powerband, and adjust accordingly.

2.) After watching the video, the engines rpm is all over the place, so.. 1.) it could be a manual loading valve or if it is the automatic one its not operating correctly, you cant start a sweep and then back off, pull up and down then spike the rpm, no engine can do that.

none of the information you got is going to be any good to you because even the rpm that the sweep/load starts at varys, so your peak hp result rpm which youd use for clutching wont be of any validity. The oscilations in the charts tell the story,the video with sound just confirm it.
By all means, I dont mean to offend the dyno operator, he just needs some more time under his belt or possible repairs/adjustments done to software if its the auto loading valve,etc. Also, he should have calibrated the torque arm before you arrived to make sure hes reading correctly on the strain guage. Dynomites use a aluminum arm that bends to read the power, and they need to be calibrated.
 
well after that ill do the old version thecnic .. check wash and set rpm like u told me............and hope for the best time for trail ride now ...
 
mrviper700 said:
I got a email from modsrx, hes a little bummed, however I want to mention a few key things that make all the differance in the world:
1.) no fuel meter was used so basicly you have no idea if your rich or lean!
without that (bsfc)a dyno isnt going to help with anything , bsfc is the information which tells you the amount of fuel the engine is drinking, telling you if its rich or lean and a mandatory tuning tool if you want to actually get a "tuning session". bsfc tells you if the engine on the dyno is making good trail safe power or wicked lean big hp numbers. More importantly though allows you to watch for lean parts of the engines powerband, and adjust accordingly.

2.) After watching the video, the engines rpm is all over the place, so.. 1.) it could be a manual loading valve or if it is the automatic one its not operating correctly, you cant start a sweep and then back off, pull up and down then spike the rpm, no engine can do that.

none of the information you got is going to be any good to you because even the rpm that the sweep/load starts at varys, so your peak hp result rpm which youd use for clutching wont be of any validity. The oscilations in the charts tell the story,the video with sound just confirm it.
By all means, I dont mean to offend the dyno operator, he just needs some more time under his belt or possible repairs/adjustments done to software if its the auto loading valve,etc. Also, he should have calibrated the torque arm before you arrived to make sure hes reading correctly on the strain guage. Dynomites use a aluminum arm that bends to read the power, and they need to be calibrated.
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thanks for clearing this up I just watched some videos online and there pulls were all slower and smooth throughout. He was using a manual control valve. I will be contacting him and expect a repull with a calibrated arm and smoother operation, if there was anything off. I know my sled makes alot more power then that

Thanks Don
 
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Concept Carbon said:
thanks for clearing this up I just watched some videos online and there pulls were all slower and smooth throughout. He was using a manual control valve. I will be contacting him and expect a repull with a calibrated arm and smoother operation. I know my sled makes alot more power then that

Thanks Don
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same here concept but i think i will keep my head on trail....will see vs my friend stock srx
 
mrviper700 said:
I got a email from modsrx, hes a little bummed, however I want to mention a few key things that make all the differance in the world:
1.) no fuel meter was used so basicly you have no idea if your rich or lean!
without that (bsfc)a dyno isnt going to help with anything , bsfc is the information which tells you the amount of fuel the engine is drinking, telling you if its rich or lean and a mandatory tuning tool if you want to actually get a "tuning session". bsfc tells you if the engine on the dyno is making good trail safe power or wicked lean big hp numbers. More importantly though allows you to watch for lean parts of the engines powerband, and adjust accordingly.

2.) After watching the video, the engines rpm is all over the place, so.. 1.) it could be a manual loading valve or if it is the automatic one its not operating correctly, you cant start a sweep and then back off, pull up and down then spike the rpm, no engine can do that.

none of the information you got is going to be any good to you because even the rpm that the sweep/load starts at varys, so your peak hp result rpm which youd use for clutching wont be of any validity. The oscilations in the charts tell the story,the video with sound just confirm it.
By all means, I dont mean to offend the dyno operator, he just needs some more time under his belt or possible repairs/adjustments done to software if its the auto loading valve,etc. Also, he should have calibrated the torque arm before you arrived to make sure hes reading correctly on the strain guage. Dynomites use a aluminum arm that bends to read the power, and they need to be calibrated.
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big thnx don for the help that sled seem to pull alots harder than last year ;)!
 
Concept Carbon said:
wooooooooooooooooooooo wooooooooooooo :whine: :whine:




just pisses me off abit when you dont get what you pay 4. #$%&*
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Its too bad you guys did not get what you expected. At least you both came up with similar numbers, means that SRX piped Viper is not giving anything up to a SRX.
There have been other posts on here with dissapointing Dyno results because of inconsistancies due to equipment, operator, calibration, correction factor, ect.
I think thats why a lot of people like Valin have travelled to a specialty bussiness like the "Dynotech" facility. They have state of the art equipment, lots of years of operating experience ,especially with sleds, and are set up for "Tuning" the sleds although I suspect they are likely pretty expensive...
 
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Carbon, did you consider going to see Greg over at Jaws? He runs the same dyno setup (Superflow) as Dynotech.
 
valin said:
Carbon, did you consider going to see Greg over at Jaws? He runs the same dyno setup (Superflow) as Dynotech.
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I contacted him a while back and he seemed pretty busy and alot more expensive.
 
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sideshowBob said:
Its too bad you guys did not get what you expected. At least you both came up with similar numbers, means that SRX piped Viper is not giving anything up to a SRX.
There have been other posts on here with dissapointing Dyno results because of inconsistancies due to equipment, operator, calibration, correction factor, ect.
I think thats why a lot of people like Valin have travelled to a specialty bussiness like the "Dynotech" facility. They have state of the art equipment, lots of years of operating experience ,especially with sleds, and are set up for "Tuning" the sleds although I suspect they are likely pretty expensive...
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We were disapointed but it was still fun and a learning experrience. I was pretty impressed I figured MOD's srx would pull above mine considering he is running alot more agressive heads compression 22cc vrs 24cc and porting. Goes to show MrViper really knows his stuff, im going to have to find myself a set of srx heads and have mrviper cut them next.
 
I just spoke with him and he said he is going to go over everything, and make sure it was calibrated correctly. The numbers didnt make sense to him ethier. He is a stand up guy and stands behind his work and will give us a repull if anything was wonky.

I will keep everyone updated on the results.
 
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Concept Carbon said:
I just spoke with Jody and he said he is going to go over everything, and make sure it was calibrated correctly. The numbers didnt make sense to him ethier. He is a stand up guy and stands behind his work and will give us a repull if anything was wonky.

I will keep everyone updated on the results.
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;)! ;)! :letitsnow
 
Concept Carbon said:
I just spoke with Jody and he said he is going to go over everything, and make sure it was calibrated correctly. The numbers didnt make sense to him ethier. He is a stand up guy and stands behind his work and will give us a repull if anything was wonky.

I will keep everyone updated on the results.
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If you ever want another place for dyno check out Cliff at Advanced Dyno. He is a snowmobile passionate. He installed my Bender reaction suspension for me a couple of years back and is a stand up guy.

http://www.youtube.com/watch?v=u6EHNW3_Jhw
 
Well he never got back to me, guess he is not the stand up guy I thought. Its a piss off when someone pretends to know what there doing and take your money for nothing.
1995vmax500le said:
yep from anything i hear cliff is really knowledgeable and it would be a good second reference just to see if there is something wrong
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Something was definatly wrong a sled dosnt loose power with porting.
 
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