Cut back your Bov vacuum line 1 inch when you install a turbosmart bov!

[yamamarc]

If anyone is running a turbosmart bov i recommend to cut 1 inch off the small line that goes the the barbed fitting!
I posted this in a different thread but thought it would be a good idea to post for everyone.
The oem bov has a bigger barbed fitting so the line in stretched and doesn't seal properly on the turbosmart.
I was troubleshooting low boost on a hurricane tuned winder. Did a boost leak test and pressure would holding.
After looking everything over i decide to pressurize the intake and wiggled all the hose to check. I just touched the line on bov and it started pissing out air.
After looking closer at the hose I noticed that the line was stretched and would not seal.
After cut 1 inch off it it took force to install hose!! Nice and tight!

 

[yamamarc]

 

[fatchance]

Good find Marc. I went through the entire process of tightening the throttle body boot clamps and i think this was the source of my boost leak all along. I know eventually i would have to grind the spacers down on the boot clamps so it is what it is, but after doing so i could here the air pissing out from the BOV which is tough to pinpoint at the time even after doing a soap test.

 

[WinderFab]

Awesome info like always Marc

 

[no1b4me]

Hey Marc.... Great preventative find ! Thanks......
As you stated removing 1" of the stretched BOV hose, also I added a small zip tie to pinch down into the barbs.
I actually removed the majority of the stock spring hose clamps on all associated boost lines and replaced them with zip ties. Those OEM spring clamps just don't have enough clamping force to pinch against the barbs.
Good work Marc!
Cheers

 

[yamamarc]

Hey Marc.... Great preventative find ! Thanks......
As you stated removing 1" of the stretched BOV, also I added a small zip tie to pinch down into the barbs.
I actually removed the majority of the stock spring hose clamps on all associated boost lines and replaced them with zip ties. Those OEM spring clamps just don't have enough clamping force to pinch against the barbs.
Good work Marc!
Cheers

Thanks Rob
Those darn spring clamps are garbage!! They don't clamp hard enough
Once we had the leak figured out on his sled he decided to change all the small hose spring clamp with fuel line clamps! I am going to do the same eventhough I had no issues on my own sled

 

[yamamarc]

Good find Marc. I went through the entire process of tightening the throttle body boot clamps and i think this was the source of my boost leak all along. I know eventually i would have to grind the spacers down on the boot clamps so it is what it is, but after doing so i could here the air pissing out from the BOV which is tough to pinpoint at the time even after doing a soap test.

The leak was tricky on this sled it would hold 24lbs and only leak when I lightly wiggled the hose... my guess is that the vibration would vibrate the hose causing a leak.

 

[DennyTuna]

Great info Marc. I installed my Turbosmart Bov just today. Going to have a second look at it and just do it right.

 

[fourload]

I just installed one recently also. Off comes the hood again to double check the hose.

 

[yamahahaapex]

Just seen this an hour ago and fingers crossed it would fix the 2psi I’m missing. Unfortunately even though I didn’t cut that line the better hose clamp I used is holding fine when up to 22psi when I wiggle that line.

I have a leak somewhere but it’s not when the sled is stationery.

 

[Justinboost]

If anyone is running a turbosmart bov i recommend to cut 1 inch off the small line that goes the the barbed fitting!
I posted this in a different thread but thought it would be a good idea to post for everyone.
The oem bov has a bigger barbed fitting so the line in stretched and doesn't seal properly on the turbosmart.
I was troubleshooting low boost on a hurricane tuned winder. Did a boost leak test and pressure would holding.
After looking everything over i decide to pressurize the intake and wiggled all the hose to check. I just touched the line on bov and it started pissing out air.
After looking closer at the hose I noticed that the line was stretched and would not seal.
After cut 1 inch off it it took force to install hose!! Nice and tight!

When you boost leak tested was the power and engine off? Pressure was coming out of the vaccum line going to the bloow off valve?

When I boost leak test mine I can pull the BOV vaccum line off and I get no pressure coming out of the line at all? I was assuming the bov solenoid had to open with the engine running and under boost or vaccum

 

[REDLINE 1]

I was thinking about upgrading all those small lines with high temp silicon vacuum tubing . Much more pliable, did it on my 2012 turbo procross. EVO actually was selling a kit at the time. Cheap upgrade

 

[DennyTuna]

Got a look at that line this afternoon and it was just as you described it Marc. Cut off an inch and it took some force to get it on.

 

[DeBo]

I cut 1.25 inches on mine. I also needed to use a vise to make the clamp smaller to stay on the hose nicely.

 

[0degC]

When you boost leak tested was the power and engine off? Pressure was coming out of the vaccum line going to the bloow off valve?

When I boost leak test mine I can pull the BOV vaccum line off and I get no pressure coming out of the line at all? I was assuming the bov solenoid had to open with the engine running and under boost or vaccum

I believe system boost must be on both sides of BOV to hold it closed, the spring itself won’t hold much boost. The top port on solenoid is connected to boost/ vacuum on other side of Throttle bodies, so when Ecu sees you let off Throttle it sends electric signal to solenoid to switch to vacuum (with Throttle closed vacuum now at that side) and this pops open bov.