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SVTPerformance's Chain of Restaurants
The Blower Bistro
Low Boost question?
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<blockquote data-quote="01silverstang" data-source="post: 16822480" data-attributes="member: 21743"><p>Over the last week I have been driving the Cobra more frequently, it's got a Stage 2 P-1SC with a 3.9 pulley, and I noticed I'm normally right around 6 psi, it briefly hit 7 psi but never higher. The last time I took it out, I got 5 psi. Though the amounts were different, the ramp rate was similar and it holds the boost level it peaks at... So I contacted Procharger and their response was that my full exhaust was likely contributing to the loss of boost, specifically my long tube headers. They recommended going to a 3.6 pulley. </p><p></p><p>I posted on the Procharger facebook group to see if the Procharger 3.6 would be sufficient or if I should spend the extra and get a ZPE Griptec 3.625 pulley? The response overwhelmingly favored Griptec, but a few people advised they thought it was belt slip. The tensioner is good, and with a 3.9 pulley on I wouldn't think belt slip would be an issue.</p><p></p><p>So what do you guys think? I don't want to invest a couple hundred in a Griptec 3.625 and then grenade the engine, because it was belt slip and I'm now over 10 psi between the belt slip being eliminated and a smaller pulley. Inversely I don't want to spend a couple hundred on a 3.9 Griptec pulley and still be sitting at 6 psi because there was no belt slip and my headers are causing the boost drop. Help please!</p></blockquote><p></p>
[QUOTE="01silverstang, post: 16822480, member: 21743"] Over the last week I have been driving the Cobra more frequently, it's got a Stage 2 P-1SC with a 3.9 pulley, and I noticed I'm normally right around 6 psi, it briefly hit 7 psi but never higher. The last time I took it out, I got 5 psi. Though the amounts were different, the ramp rate was similar and it holds the boost level it peaks at... So I contacted Procharger and their response was that my full exhaust was likely contributing to the loss of boost, specifically my long tube headers. They recommended going to a 3.6 pulley. I posted on the Procharger facebook group to see if the Procharger 3.6 would be sufficient or if I should spend the extra and get a ZPE Griptec 3.625 pulley? The response overwhelmingly favored Griptec, but a few people advised they thought it was belt slip. The tensioner is good, and with a 3.9 pulley on I wouldn't think belt slip would be an issue. So what do you guys think? I don't want to invest a couple hundred in a Griptec 3.625 and then grenade the engine, because it was belt slip and I'm now over 10 psi between the belt slip being eliminated and a smaller pulley. Inversely I don't want to spend a couple hundred on a 3.9 Griptec pulley and still be sitting at 6 psi because there was no belt slip and my headers are causing the boost drop. Help please! [/QUOTE]
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SVTPerformance's Chain of Restaurants
The Blower Bistro
Low Boost question?
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