Car jerking hard at WOT

[bryan.catano93]

would it be possible that the wastegate is not opening?

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[Jesse36m3]

That 100% looks like boost cut. MAP sensor is seeing nearly 16psi. Is your wastegate line routed correctly and attached to the bottom port of the wastegate? Top should be vented and the other end connected to the turbo compressor housing. Not sure who is tuning your kit, but in my case, I was told not to floor it until given the OK - and it definitely wasn't after the first revision .. more like the 4th or 5th revision.


For what it's worth, I was on the track a couple weeks ago and the wastegate line popped off and my log looked exactly like yours because I spiked to 14psi. It's a damn good thing there was a failsafe in place.

[bryan.catano93]

Originally Posted by Jesse36m3

That 100% looks like boost cut. MAP sensor is seeing nearly 16psi. Is your wastegate line routed correctly and attached to the bottom port of the wastegate? Top should be vented and the other end connected to the turbo compressor housing. Not sure who is tuning your kit, but in my case, I was told not to floor it until given the OK - and it definitely wasn't after the first revision .. more like the 4th or 5th revision.


For what it's worth, I was on the track a couple weeks ago and the wastegate line popped off and my log looked exactly like yours because I spiked to 14psi. It's a damn good thing there was a failsafe in place.

yeah i made sure that i was given the ok. he told me to grab one WOT log and 15 min of regular driving. yeah that is how i have it set up. it was a used kit so the wastegate was assembled already. there is one port blocked. maybe the blocked port is the wrong one? should i switch them?

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[Kodename47]

Originally Posted by bryan.catano93

yeah its the first revision after the basemap. what could be causing the boost cut?

Typically you set a boost limit and then when it hits that the fuel is completely cut. It's safety to prevent overboost. However it seems to cut at 2 bar MAP, which is 1 bar of boost. You could have it set low to ensure all is safe or is not used to the platform and set 2 bar limits thinking it was MRP.

[Irace86.2.0]

Originally Posted by Kodename47

I would say that looks like boost cut, probably on an early revision tune to make sure everything is OK.

How would there be boost cut without a boost controller? Isn’t his setup just mechanical? Do you mean the tune is cutting ignition and fuel?

Edit: never mind you answered

[Irace86.2.0]

Originally Posted by bryan.catano93

would it be possible that the wastegate is not opening?

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What is your wastegate spring rated to?

A wastegate that doesn’t open would mean the boost would spike. One that sticks open would make it hard to inpossible for boost to build.

[bryan.catano93]

Originally Posted by Irace86.2.0

What is your wastegate spring rated to?

A wastegate that doesn’t open would mean the boost would spike. One that sticks open would make it hard to inpossible for boost to build.

its set to 9psi( green spring) and i need to double check the wastegate then. itll. be a pita to remove it with everything bolted up but no way around it lol

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[bryan.catano93]

took everything apart. the wastegate seems to be working properly. i used a soft spring and opened with my hands multiple times. so i dont think its the wastegate.. at this point im out of ideas, hardware wise


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[Kodename47]

Originally Posted by bryan.catano93

took everything apart. the wastegate seems to be working properly. i used a soft spring and opened with my hands multiple times. so i dont think its the wastegate.. at this point im out of ideas, hardware wise

Look at the log, when it happens the fuel quantity total goes to 0. It's in the tune.

[secho]

Originally Posted by Kodename47

Look at the log, when it happens the fuel quantity total goes to 0. It's in the tune.

I see that in the same way. It is in the tune. Looks Luke load limits are set at 2. It fuelcuts while you exceed this.

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[bryan.catano93]

Originally Posted by secho

I see that in the same way. It is in the tune. Looks Luke load limits are set at 2. It fuelcuts while you exceed this.

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i guess its a waiting game now, my tuner is only back saturday. wont drive the car until then just in case. i hope its the tune tbh.

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[bryan.catano93]

Originally Posted by Kodename47

Look at the log, when it happens the fuel quantity total goes to 0. It's in the tune.

why would i be overboosting tho?

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[Irace86.2.0]

Originally Posted by bryan.catano93

why would i be overboosting tho?

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That is the question. Either the spring is sticking (unlikely if new and in good condition), or the spring is not the correct rating (ie 9psi, also possible but probably not likely), or the manifold pressure line going into the wastgate is leaking, cracked, not hooked up correctly, or has popped off (easily checked), or you are getting wicked boost creap (unlikely at your psi setting and turbo size).

[bryan.catano93]

this how the wastegate is set up

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