Boost leak test

[deddmoney]

Anyone performed a boost leak test on these cars yet? If so are you pressurizing from the inlet of the turbo itself (seems difficult to reach), or just removing the intake tube from the airbox and doing it from there. My cars a little down on power vs other stock EBs and I'm trying to figure out why.

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[MustangEcoboost.com]

I would hope that you don't have a boost leak given that its such a new car. Are you using / have you always used 91 or 93 octane?

Check this out regarding what Cobb has dubbed the OAR "Octane Adjustment Ratio": https://cobb.app.box.com/ford-oar . Holds true even without a tune of course.

If you are doing a leakcheck the proper place would be to do it from the compressor inlet but you can do it from the airbox area as well and use soapy water to look for bubbles.

A leakdown check (pressure drop over time) may not be that accurate if you are checking from the airbox given that anything before the compressor inlet wasn't designed to withstand positive pressure.

 

[deddmoney]

Always 93. I hope there's not leak as well, but it always felt soft relative to the other EBs id driven, and I just got it up on a dynojet today and on the best of 2 runs it put down 270hp, 259tq sae, so it seems to be down a fair bit of tq compared to every other stock EB dynojet numbers I've seen. Any other thoughts or ideas?

 

[Impulsed7]

Did you put all your numbers into the dyno right? tire sizes, diff ratios, trans, etc. Should not have less tq readout on a car with this much low end power and such a low rpm.

 

[Vile_the_Bastage]

Anyone performed a boost leak test on these cars yet? If so are you pressurizing from the inlet of the turbo itself (seems difficult to reach), or just removing the intake tube from the airbox and doing it from there. My cars a little down on power vs other stock EBs and I'm trying to figure out why.

Does the EB have an atmospheric BOV or a recirculating BPV? Pressurizing from the turbo inlet tube can some times be bad juju depending on what other vac lines are attached. I would pressure check from the turbo itself starting low... like 5 - 7 psi and see if it even holds that. Then slowly turn it up. Keep in mind, whether you have a true leak or not, the system will slowly loose pressure over time. However, if it loses pressure quickly, you have a leak.

 

[Impulsed7]

or just cap it off and smoke check it instead of pressurizing? I don't think he has a leak.

 

[deddmoney]

Everything was entered correctly. The car always felt sluggish on the low end and seemed to wake up around 4500, pretty much the opposite of what others were reporting. Torque curve on the dyno seemed to showcase this to a degree, tq was fairly flat across the board but peaked around 4500-5700, not early with a gradual decline like other graphs I've seen. I plan on modding the car extensively, and want to get to the bottom of this before doing so.

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