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Miscellaneous Automotive
Car Performance & Repair
Boost Issues
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<blockquote data-quote="JustinStone" data-source="post: 8722014" data-attributes="member: 680824"><p>Purchased a diablo intune i3 8345, and put a tune on the Cruiser. The boost wasn't making the numbers advertised, and talked about on forums, so I got to tinkering. The stock SRT4 wastegate opened with the slightest pressure to it, so about a .25" shim was added to stiffen the spring. This allowed for 2 more pounds of sustained boost but i still have an issue. My boost spikes at 13-14psi around 1-4k rpm, then begins to rapidly fall as I increase in speed, reaching as low as 7psi. An audible whooshing sound is heard, much like the blow-off, around 7-14psi while still on the throttle. Stock SRT4 BOV's are supposed to take upwards of 20psi so this failure doesn't make sense to me (I replaced the BOV with a spare and no change).</p><p></p><p>Does anyone have any suggestions?</p><p></p><p>Boost leak tests aren't impossible with our equipment, just a pain in the ass since the engine bay is tighter than spandex; so I'm tryna save some trouble.</p></blockquote><p></p>
[QUOTE="JustinStone, post: 8722014, member: 680824"] Purchased a diablo intune i3 8345, and put a tune on the Cruiser. The boost wasn't making the numbers advertised, and talked about on forums, so I got to tinkering. The stock SRT4 wastegate opened with the slightest pressure to it, so about a .25" shim was added to stiffen the spring. This allowed for 2 more pounds of sustained boost but i still have an issue. My boost spikes at 13-14psi around 1-4k rpm, then begins to rapidly fall as I increase in speed, reaching as low as 7psi. An audible whooshing sound is heard, much like the blow-off, around 7-14psi while still on the throttle. Stock SRT4 BOV's are supposed to take upwards of 20psi so this failure doesn't make sense to me (I replaced the BOV with a spare and no change). Does anyone have any suggestions? Boost leak tests aren't impossible with our equipment, just a pain in the ass since the engine bay is tighter than spandex; so I'm tryna save some trouble. [/QUOTE]
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