Help with Boost issue won't boost higher than 3 psi - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 14 Old 11-29-2012, 08:59 PM Thread Starter
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Help with Boost issue won't boost higher than 3 psi

The is car is dead nut 3 pounds of boost on dyno then graph leves and all the way to let off. This on a turbosmart pro gate 50mm wastegate with 7 psi spring. I don't hear any . I would think 4psi leak would be heard. I have verified the spring in wastegate.


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post #2 of 14 Old 11-29-2012, 09:41 PM
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Have you taken it on the street? Dyno can sometimes read low compared to street. Also how do you have the vacuum lines hooked up to the gate?


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post #3 of 14 Old 11-30-2012, 10:06 PM Thread Starter
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It's not hook up to vacume it's hooked up to turbo out outlet so it's seeing boost. Top port vented bottom port to boost source

02 Roush, Livernois stage 1 cams, eaton posi, qa1 kmember, highly modified on3 turbo kit
Turbo numbers 415 rwhp 458 rwtq
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Last edited by sonic 02; 11-30-2012 at 10:08 PM.
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post #4 of 14 Old 12-01-2012, 08:54 AM
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Coldside boost leak.

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post #5 of 14 Old 12-01-2012, 12:18 PM
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If the wastegate and bov r working right and u hear no leaks and all ur connections r leak free check ur boast gauge and the line or hose
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post #6 of 14 Old 12-01-2012, 01:51 PM Thread Starter
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Quote:
Originally Posted by Quick Time View Post
If the wastegate and bov r working right and u hear no leaks and all ur connections r leak free check ur boast gauge and the line or hose
Boost gauge and dyno boost read the same. We are going to add another spring to waste gate.

02 Roush, Livernois stage 1 cams, eaton posi, qa1 kmember, highly modified on3 turbo kit
Turbo numbers 415 rwhp 458 rwtq
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CG hot side T6 turbo under way
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post #7 of 14 Old 12-01-2012, 02:36 PM
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Okay I have just seen boost gauges b messed up that were brand new just a thought r u sure bov is staying closed
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post #8 of 14 Old 12-01-2012, 04:26 PM
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Quote:
Originally Posted by sonic 02 View Post
Boost gauge and dyno boost read the same. We are going to add another spring to waste gate.
Adding a spring is only going to make things worse if you have a boost leak which is what it sounds like. Aren't you running an on3 kit? It could be a hotside or cold side leak and it doesn't take much of anything to keep it from making boost. A simple pin hole in a weld could make it do that

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post #9 of 14 Old 12-01-2012, 07:26 PM Thread Starter
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I think I'm leaning towards a boost leak. I think we are going to look at bov a little closer. Yes its a highly reworked on3 kit. I'm 99.9 % sure there is no hot side leaks .

02 Roush, Livernois stage 1 cams, eaton posi, qa1 kmember, highly modified on3 turbo kit
Turbo numbers 415 rwhp 458 rwtq
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CG hot side T6 turbo under way
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post #10 of 14 Old 12-01-2012, 11:55 PM
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i know a guy that took all his cold side piping and pressure tested it with dyes. With the dyes any tiny leak will show. If there is a boost leak, after its fixed the car will run 100x better and the turbo will be alot more responsive


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post #11 of 14 Old 12-02-2012, 11:04 PM
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Intercooler flow well? I had an eBay one that restricted me to 5lbs due to poor design. I changed the endtanks and been fine ever since.

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post #12 of 14 Old 12-03-2012, 01:28 AM Thread Starter
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It should it's a percision IC rated at 800 hp

02 Roush, Livernois stage 1 cams, eaton posi, qa1 kmember, highly modified on3 turbo kit
Turbo numbers 415 rwhp 458 rwtq
Stupidity is a sexually transmitted disease
CG hot side T6 turbo under way
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post #13 of 14 Old 12-03-2012, 08:55 AM
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See post 4 again lol. I have seen it a million times I would say 99.9% sure you have a coldside leak somewhere.

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post #14 of 14 Old 12-07-2012, 07:08 PM Thread Starter
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Thanks for everyone's help turned out to be a few things going on. Bad bov and a few boost leaks.

02 Roush, Livernois stage 1 cams, eaton posi, qa1 kmember, highly modified on3 turbo kit
Turbo numbers 415 rwhp 458 rwtq
Stupidity is a sexually transmitted disease
CG hot side T6 turbo under way
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