I inspected my belt and tensioner. See the tensioner below. It seems the tensioner is way past the groove mark towards loose. Is this a weak tensioner or sloppy belt or both? I have the Gates 74.5 which seems to be the right length with my set up. Thanks for any insight.
Supercharger tensioner and belt question
- Thread starter Palacios289
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I inspected my belt and tensioner. See the tensioner below. It seems the tensioner is way past the groove mark towards loose. Is this a weak tensioner or sloppy belt or both? I have the Gates 74.5 which seems to be the right length with my set up. Thanks for any insight.
Probably a worn (stretched) belt......might want to try a new belt and see what happens?
Where did you measure boost from?
Sent from my Moto E (4) Plus using the svtperformance.com mobile app
Sent from my Moto E (4) Plus using the svtperformance.com mobile app
Bdubbs I am not sure this reading was from the Dyno boost line hookup. I’m sure it was hooked up correctly as GTR is mustang shop.
I’m going to order a belt. It can’t hurt replacing. The belt on currently is at least three years old
I’m going to order a belt. It can’t hurt replacing. The belt on currently is at least three years old
What is your exact pulley/idler setup? I want to double-check your belt size.
Cobrabob, billetflow 2.76 and billetflow 100mm idler.
Maybe I'm looking at things backwards, but isn't that full tight? The stop to the left is for when there's no belt tension? Was the boost consistent or did it start higher and drop off?
Slow894, I posted the dyno printout.
Given that the boost didn't drop off I think your belt is fine. If the tensioner is at max travel I'd say it's too tight IMO. Try a different boost gauge. See what it says.
Ya that boost graph looks pretty solid, not sure there's a lot of slip there. The peak number might just be off on that measuring device.
What I'd be concerned with seeing the A/F ratio....it was on quite a pull until 5500. Might be off upper rpm and tune needs a tweak and/or you're having a fuel delivery issue
What I'd be concerned with seeing the A/F ratio....it was on quite a pull until 5500. Might be off upper rpm and tune needs a tweak and/or you're having a fuel delivery issue
C6hombre, they didn't measure air/fuel, My air fuel monitor will show 10.5 or so at WOT. FPDC will max out at 0.92 on my SCT. I do have a BAP i've been meaning at install.
Is too tight on belt the same as too loose when it comes to belt slip? Thanks.
That's really rich. I aim for 11.5 at WOT.
No. Too tight kills mains bearings as mentioned. You'd be better off getting a properly fitting belt.
Thanks Gents. What size should I get? All the belt guides say a 74.50 should be the right length with my combo.
The Problem is obvious, you're running a BF and not Metco.
HAHAHAHA
HAHAHAHA
Could be the blower is maxed out, as in worn and not capable of making new blower boost.
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Success! Swapped out tensioner and belt to the one recommend above. I noticed the new tensioner has at 3 times the spring tension of the original one. No weird noises going on. I’ll wait until this weekend to really crank her down.
As to my air fuel ratios, my Cobra was dyno tuned by previous owner at AED in Northern California. They are notorious for very safe and sane tunes especially with the junk tree hugger gasoline we have her in California. Is it worth it too retune? I plan to go VMP or whipple by end of year. Thanks again for any feedback.
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