High EGT's, Low Boost?? - Ford Powerstroke Diesel Forum
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post #1 of 4 Old 09-10-2012, 04:38 PM Thread Starter
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High EGT's, Low Boost??

Hey there peps, would like you input on this issue please.

My buddy has an 03 F350 dually 7.3L, 4" exhaust, K&N air cleaner assy, GTP38R turbo.
His issue is that on slight tip in, egt's rise and boost is low. His fuel pressure is good, no exhaust leaks, no CAC leaks, MAP, BARO, EBP are with in 0.5psi of each other all are under 14.7psi also. Waste gate linkage is ok(not binding or mis-adjusted), EPC valve(on pedestal) is ok, not mis-adjusted or binding, at WOT it is only boosting to 16-17psi with the bigger ball bearing turbo. He has stated that stock it has boosted up to 22-23psi. Injectors are operating properly. I have been helping him out on this. I do not know what else to look for.

Your inputs and opinions would be helpful.. Thanks
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post #2 of 4 Old 09-10-2012, 10:58 PM
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That's about what I saw after installing a 38r. The wastegate is set too loose, tighten it up and you should be able to get close to the same boost as the stock turbo. Keep in mind that you won't see as much boost because it's lager and less restrictive but is still moving more air. If your running stock injectors, just tighten the wastegate as far as it can go, you won't be able to max out the turbo.

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post #3 of 4 Old 09-11-2012, 05:32 AM
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You may be creating a too lean condition (too much air and not enough fuel) if he is running stock injectors.


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post #4 of 4 Old 09-11-2012, 05:42 AM
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Quote:
Originally Posted by DieselJoE26 View Post
Hey there peps, would like you input on this issue please.

My buddy has an 03 F350 dually 7.3L, 4" exhaust, K&N air cleaner assy, GTP38R turbo.
His issue is that on slight tip in, egt's rise and boost is low. His fuel pressure is good, no exhaust leaks, no CAC leaks, MAP, BARO, EBP are with in 0.5psi of each other all are under 14.7psi also. Waste gate linkage is ok(not binding or mis-adjusted), EPC valve(on pedestal) is ok, not mis-adjusted or binding, at WOT it is only boosting to 16-17psi with the bigger ball bearing turbo. He has stated that stock it has boosted up to 22-23psi. Injectors are operating properly. I have been helping him out on this. I do not know what else to look for.

Your inputs and opinions would be helpful.. Thanks
First thing I'd do is remove that restrictive, underflowing, motor and turbo dusting k&n crap.

Second, if you have stock injectors, they aren't tossing nearly enough fuel at that 38r to spool it up.


Oh, apparently jrz13 has replied with the same thing.. Didnt see that. But thats what I'm leaning towards.
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