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Dyno tune issues

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Old 03-18-2017, 10:10 AM
  #41  
schpenxel
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Much better!
Old 03-18-2017, 10:13 AM
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UmX
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Originally Posted by schpenxel
Much better!
i got the sizes from chris at ecs... hey did u get my number? when did u want to meet up
Old 03-18-2017, 10:19 AM
  #43  
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Yeah I got it, I'll send you mine too. I'm thinking wed or thur night, I've got dinner plans already tue
Old 03-18-2017, 10:24 AM
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I saw this post from Doug that might help anyone in the future

https://www.corvetteforum.com/forums...ch-blower.html
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Old 03-18-2017, 10:38 AM
  #45  
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Much better. As RPMs go up the belt stretches and that tensioner takes up the slack. Before it would probably move the 1/4", and then you lose tension on the belt, causing your problem. Now it can maintain tension.
Old 03-18-2017, 10:49 AM
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Originally Posted by Unreal
Much better. As RPMs go up the belt stretches and that tensioner takes up the slack. Before it would probably move the 1/4", and then you lose tension on the belt, causing your problem. Now it can maintain tension.
now is it going to stretch at all and have to tighten the manual one more?
Old 03-18-2017, 10:54 AM
  #47  
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Belts always stretch. So yes, as it stretches you probably have to adjust the manual tensioner, especially if it is a new belt.
Old 03-18-2017, 12:15 PM
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Originally Posted by Unreal
Belts always stretch. So yes, as it stretches you probably have to adjust the manual tensioner, especially if it is a new belt.
My concern is that the manual tensioner is maxes right now.
Old 03-18-2017, 01:03 PM
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i had 2 shorter belts already in route so ima try to fit the shorter one on
Old 03-18-2017, 05:59 PM
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i tried to get a 897 on wasnt happening.. i did how ever find a dayco belt which is .24inchs shorter not sure if its worth trying or not. I got the manual tensioner at roughly 85% right now.. and the auto is id say between 1 and 2 o clock..


Old 03-19-2017, 11:33 AM
  #51  
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You can put a ratchet on the spring loaded tensioner and see if it's as far "open" as it'll go or not. I usually try to set the manual tensioner so that the spring loaded one is open all the way but I don't force the manual tensioner any further than that.

Just don't crank on the square nut on the spring loaded tensioner too much or it'll strip out

I'd try what you've got on there and then re-check it after some miles and see how much it's stretched. If you've got a little bit of adjustment left on the manual one you should be able to take up a little bit of stretch with that still if needed

Last edited by schpenxel; 03-19-2017 at 11:36 AM.
Old 03-19-2017, 11:41 AM
  #52  
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Originally Posted by schpenxel
You can put a ratchet on the spring loaded tensioner and see if it's as far "open" as it'll go or not. I usually try to set the manual tensioner so that the spring loaded one is open all the way but I don't force the manual tensioner any further than that.

Just don't crank on the square nut on the spring loaded tensioner too much or it'll strip out

I'd try what you've got on there and then re-check it after some miles and see how much it's stretched. If you've got a little bit of adjustment left on the manual one you should be able to take up a little bit of stretch with that still if needed
cool i just dont think i can get any smaller of a belt on that car..

Last edited by UmX; 03-19-2017 at 11:41 AM.
Old 03-19-2017, 07:39 PM
  #53  
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Is there any real risk in taking out any of the bearings on the accessories from over tightening the belt? I run mine tight but I know there is room to add another 10 to 15% more tension no problem.
Old 03-19-2017, 08:39 PM
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Originally Posted by GeneSch
Is there any real risk in taking out any of the bearings on the accessories from over tightening the belt? I run mine tight but I know there is room to add another 10 to 15% more tension no problem.
There is already a lot of stress on the bearings. I would not over tighten the belt.
Old 03-20-2017, 09:46 AM
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Only way to "overtighten" is to max out the spring tensioner, then keep adding more and more. Otherwise tension is just controlled by the spring tensioner.

Yes, all your accessories are under more load if you don't have a DD. One of the downsides to a blower setup.
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Old 03-20-2017, 12:17 PM
  #56  
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Originally Posted by Unreal
Only way to "overtighten" is to max out the spring tensioner, then keep adding more and more. Otherwise tension is just controlled by the spring tensioner.

Yes, all your accessories are under more load if you don't have a DD. One of the downsides to a blower setup.
One of the reason an OEM blower setup will run on a separate belt then the rest of the accessories.
Old 03-20-2017, 02:37 PM
  #57  
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Looks much better now, make sure your tune is finalized after this, it will need more fuel up top with the added boost.

We have a belt guide on our web site for future use.

http://www.eastcoastsupercharging.co...denew12317.pdf

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Old 03-20-2017, 02:39 PM
  #58  
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Originally Posted by DOUG @ ECS
Looks much better now, make sure your tune is finalized after this, it will need more fuel up top with the added boost.

We have a belt guide on our web site for future use.

http://www.eastcoastsupercharging.co...denew12317.pdf
ya chris sent me it..
Old 03-22-2017, 12:19 PM
  #59  
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started the car let it run, rev it a few times. Looks like it shifted a lil.. manual tensioner is maxed out now.. so if it stretches any more im screwed lol.. Bc i cant get the next size belt on it. Ill have Schpenxel check it out when he comes by tomorrow.

Last edited by UmX; 03-22-2017 at 12:19 PM.
Old 03-22-2017, 01:10 PM
  #60  
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Are you sure you can't get the next size down? It should be a royal pain in the ***, with lots of cussing/swearing/blood.


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