Roush tvs blower issues

BH Tuner

Tuner in process
Established Member
Joined
Jun 27, 2019
Messages
65
Location
Bahrain
hey everyone,

i've been having some issues with my car ever since i installed the tvs,, first it was the belt slip and i removed the 79mm pulley and replaced it with a griptech 81mm pulley (problem solved).

second issue i had is that my boost gauge ( i'm using snow performance boost gauge was reading low boost on high rpm ( i was doing a 4th gear pull from 2500 rpm to 7500 rpm and the boost was only 6 to 7 and the engine load was low as well) so i had my doubt about my bypass valve and replaced it with a new one.

however upon installation ( i didn't install the blower myself, it was done by a shop) i noticed my elbow doesn't have the nipple for the bypass valve hose (BIG HUH!).

i know the previous owner of the kit made some adjustments to the blower and elbow and now i'm confused where should i link the hoses to since there isn't a nipple for the vacuum hose on the elbow and the other hose is going to the intake.
 

Riddick

MERICA
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Joined
Oct 25, 2012
Messages
2,640
Location
Dayton, OH
If you are experiencing belt slip issues with a 79mm pulley either your belt is way to long or your tensioner needs replacing. You should be able to run as small as a 72mm on the 6 rib without experiencing belt slip.
 

Stangra

Active Member
Established Member
Joined
Sep 21, 2018
Messages
272
Location
CA
hey everyone,

i've been having some issues with my car ever since i installed the tvs,, first it was the belt slip and i removed the 79mm pulley and replaced it with a griptech 81mm pulley (problem solved).

If you are experiencing belt slip issues with a 79mm pulley either your belt is way to long or your tensioner needs replacing. You should be able to run as small as a 72mm on the 6 rib without experiencing belt slip.
A larger idler pulley might help?
 

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