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Old 10-06-2012, 09:40 PM   #276
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Originally Posted by BaylorCamaro View Post
I was on E so there was hardly fuel weight. Even if I ran my personal best 60" my ET would still be slower than my N/A time.

What I need is whatever tune V6owner has lol.


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I wouldn't run it out on E, especially not on a FI car with the fuel supply demand. That can cause a lean condition, especially after a nice launch and that little fuels moving around the tank and not getting picked up.

Either way I got your logs.. We're on it
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Old 10-06-2012, 09:51 PM   #277
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Baylor, maybe v6owner will trade you his tune for your COTW...
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Old 10-06-2012, 09:52 PM   #278
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Quote:
Originally Posted by Matt @ RX View Post
I wouldn't run it out on E, especially not on a FI car with the fuel supply demand. That can cause a lean condition, especially after a nice launch and that little fuels moving around the tank and not getting picked up.

Either way I got your logs.. We're on it
I agree with this post. As I did this and posted this same thing on my thread awhile back when I went WOT on E and the car leaned out hard fast! And the DIC said I had 42 mile to dry.
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Old 10-06-2012, 09:53 PM   #279
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Even when I did spin my worst time of the night was 13.5 and 13.3
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Old 10-06-2012, 10:04 PM   #280
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Even when I did spin my worst time of the night was 13.5 and 13.3
Must be the driver...
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Old 10-06-2012, 10:41 PM   #281
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Well I was between 1/8 & 1/4 so I wasnt pegged on E. My point was I wasnt on a full tank so the weight of extra gas was not an issue.

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Old 10-06-2012, 10:57 PM   #282
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Well I was between 1/8 & 1/4 so I wasnt pegged on E. My point was I wasnt on a full tank so the weight of extra gas was not an issue.

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Gotcha.. Remove that possibility from the list.

Vince can also tell if you are overrunning the high pressure pump.

Stay tuned for further updates and better track times.
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Old 02-05-2013, 07:19 PM   #283
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WELL I was hoping this thread wasn't going to pop up again. At least not like this.

I heard a weird rattle coming from the engine bay earlier today. Once I got home I used an automotive stethoscope to pin the location of the sound down to the tensioner bracket and found this.

My guess is a stress fracture, just like what happened to the bolt that snapped off the tensioner a few months ago. The real salt in the wound is I haven't even been to the drag strip since I got my car back from RX. Even worse, aside from two Saturdays ago I haven't even taken my car past 4,000 RPMs (drive to work is only 5.5 miles in the city). Tensioner is hardly holding any tension on the belt.





Just spoke with Tracy, looks like he has a different bracket (1/2 billet). Stay tuned.
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Old 02-05-2013, 07:25 PM   #284
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dang... sorry to see that...
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Old 02-05-2013, 07:39 PM   #285
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Crap man, you have had a battle with everything.
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Old 02-05-2013, 07:43 PM   #286
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More Bad news?? That sucks man...hope you get it worked out.
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Old 02-05-2013, 07:50 PM   #287
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Thanks guys...

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Crap man, you have had a battle with everything.
Yup. Getting close to understanding first hand the expression the straw the broke the camel's back..
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Old 02-05-2013, 07:56 PM   #288
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Thanks guys...



Yup. Getting close to understanding first hand the expression the straw the broke the camel's back..
Hang in there. All the battle may make that final victory that much sweeter.
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Old 02-05-2013, 09:33 PM   #289
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Hang in there. All the battle may make that final victory that much sweeter.
I really hope so man. With this being my daily driver, if I have any more issues I am going to have to look into alternative options as I cannot keep having these repeats.
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Old 02-05-2013, 11:14 PM   #290
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Old 02-06-2013, 10:34 AM   #291
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Well here is the one silver lining. My current plan is to remove the tensioner bracket and bring it to my work. One aspect of our company is metallurgical testing, so I am going to have the bracket tested for hardness and try to determine the exact type of metal we are dealing with (unless Tracy knows). From that I'll be able to see if this type of metal is strong enough for the application. The next step (based on our metallurgist suggestions) is to buy an appropriate strength metal, I'm thinking Aluminum 7075. I will then have our machinist replace or build a new bracket out of the upgraded material. The end result will hopefully be something way stronger than is necessary but hopefully will never fail.
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Old 02-06-2013, 11:05 AM   #292
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Awesome man! Keep is posted!
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Old 02-06-2013, 02:41 PM   #293
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Well my bracket is 1/2" thick which means it must be your updated bracket.

Over my lunch break I removed the tensioner and brought into work. Our Ph D who is head of the lab along with our metallurgist looked at it and determined the failure was a result from stress and fatigue.

This picture shows where it started. If you look at the bottom right corner, rings extend out from bottom right to upper left like a radar ping which explains the origin point of the failure.



However if you look at the below picture you can see the the bracket was cut to accommodate the shape of the tensioner. It appears it wasn't machined in this shape and because of that there is a possibility it introduced a defect. Which makes sense since the fatigue originates right at the center of the cut.



In conclusion the break resulted from fatigue / stress fracture. However whether or not that was because of the quality of the metal isn't determinable unless a full failure analysis is performed. It IS possible that the way the bracket piece was cut rather than being machined introduced a defect, such as a hair line fracture.


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Old 02-06-2013, 03:22 PM   #294
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That does look half inch thick
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Old 02-06-2013, 03:24 PM   #295
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It is, used measuring calipers. Technically it is .499 but basically half inch.

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Old 02-06-2013, 06:07 PM   #296
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So after work I took another look and found that one of the screws stripped in two. This is the second time that this has happened now.





Also here are more pictures. As you can see the bracket has VERY crude cuts.





You guys like the hearts in that last picture? I just noticed that..... lol
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Old 02-06-2013, 09:50 PM   #297
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Not sure how the bracket attachs to the block but looks like it is hanging out the a ways. Hope to engine block mounting points are strong. I would hate to see you beef this part up only to snap something off the block.
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Old 02-08-2013, 04:07 PM   #298
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Not sure how the bracket attachs to the block but looks like it is hanging out the a ways. Hope to engine block mounting points are strong. I would hate to see you beef this part up only to snap something off the block.
I'll see if I can check out the bracket but I don't think there is much I can do about that..

So here is the full piece of the tensioner bracket that catastrophicly failed.





As you can see it looks like it was just placed in a blender. Machined very poorly

Also I just ordered 316 stainless steel to make these new brackets. Should be much much stronger than necessary but I am sick of this. Lol.

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Old 02-08-2013, 07:06 PM   #299
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My adjuster is 1/4
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Old 02-08-2013, 07:52 PM   #300
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Adjuster is only a 1/4" and it is bent a little bit so you can see a lot of stress was put on it. I'm replacing it with stainless steel. Shouldn't have an issue once I do that.

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