Why am I getting to much boost?
Have an 03 with a m5, did a few mods, fuel system, injectors, smarty ssr, finally got all my gauges working some time Ago and would only make 24 psi, this is a he341 BTW I felt like that wasn't enough for stock for some reason. so I turned my pre Injection back to stock on the ssr. (if anyone knows the function of pre injection please include that too) well once it was back to stock with the same tune my pickup smoked more on the low end and I can peak at 32psi, which from what I've read is still safe for a he341 but much more than my stock wastegate ever let through before, is this just the boost fooler that's built into the programmer or is my wastegate getting stiff and not working anymore
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when it hits 32 psi, does it stay there or drop back down wot?
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Originally Posted by 11B/11C
(Post 1103351)
when it hits 32 psi, does it stay there or drop back down wot?
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Normal for the program! You can NEVER have to much boost! LOL
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that sounds normal to me.
Originally Posted by dangerous1965
(Post 1103488)
Normal for the program! You can NEVER have to much boost! LOL
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A little humor :tttt:
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haha ok i got ya now :tu:
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Originally Posted by dangerous1965
(Post 1103488)
Normal for the program! You can NEVER have to much boost! LOL
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An HE351 is a nice upgrade, not enough for what you have for mods though.
About 35 psi on an HE341 and 40 psi on an HE351 is the limit. Drive pressure will be high on either one without some work to the turbine but as long as you don't make a habit of dumping the throttle at high boost they will stand up pretty well. |
Originally Posted by cerberus60
(Post 1103937)
An HE351 is a nice upgrade, not enough for what you have for mods though.
About 35 psi on an HE341 and 40 psi on an HE351 is the limit. Drive pressure will be high on either one without some work to the turbine but as long as you don't make a habit of dumping the throttle at high boost they will stand up pretty well. And as you can tell I was worried about 32psi for literally 1 second on an he341 I am happy with the 28 psi I can hold. I'd just like to be able to peak and hold about 34 psi which is why I was wondering if the 351 was worth it |
A really quick guide is 10 hp per 1 psi of boost, that is what you want to shoot for.
That is just a guide as charge quality makes much more difference than quantity at the top end. To run 400-450 HP and use it effectively you need 40-45 lbs of boost with enough oxygen to keep combustion temps in check. Trying to run an stock HE351 and 450 HP is going to get HOT, about 380-400 HP is all it is good for constant duty. That is about SW3 I most cases. SW7 is way too much fuel for hard usage on a stock turbo, you need a medium to large single or compounds to be safe. The HE351 will work well if you just want some frequent fun and hard runs, pushing the limit to run hard all the time though. |
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