Frankenturbo F21 PSI question

[SacSantorin]

I'm looking for some F21 owners to weigh in on how much PSI of boost there f21 is putting out. I'm about done with my tuning with motoza and I'm not making it to 20 at all. Spikes at 19 and holds at 18. Seems funny since my B6 with APR 1+ is spiking at 23 and holding 18-20 on a K03S. I'm concerned I have a boost leak or maybe an exhaust leak at the manifold. Any thoughts?

[Seerlah]

Adjust and tighten your wg actuator rod locking nuts. Common issue with the FT. You will get faster spool and more boost. You are losing it from having a loose wg flapper.

[Believer]

Have you performed a boost leak test? An improperly loaded wastegate could be the cause but so could other things. Start basic then go from there.

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[SacSantorin]

Thanks Seerlah! I'll look into that asap, I've never done a wastegate adjustment before, in your experience would it be easier if I pulled the turbo from the car?

[SacSantorin]

Have you performed a boost leak test? An improperly loaded wastegate could be the cause but so could other things. Start basic then go from there.

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Ya i have been meaning to do a boost leak test. I just moved to a new state and I'm still in the process of unpacking. I may just make a new tool to test it instead of trying to find my old one. If i recall it cost me like $3 to make from Home Depot. I was just looking for some thoughts on where I should be sitting at with boost as a baseline.

[Believer]

So on the 2.5 bar MAP Dave had me spiking 21ish then holding 20. With the 3 bar MAP I'm spiking 23 and holding 22. This was until I developed a pre turbine leak and now it's not boosting quite as much

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[G-Ride]

I'm looking for some F21 owners to weigh in on how much PSI of boost there f21 is putting out. I'm about done with my tuning with motoza and I'm not making it to 20 at all. Spikes at 19 and holds at 18. Seems funny since my B6 with APR 1+ is spiking at 23 and holding 18-20 on a K03S. I'm concerned I have a boost leak or maybe an exhaust leak at the manifold. Any thoughts?

Have you actually asked Dave what the tune is shooting for? It might just be that this is exactly how he's set the file up. I've done the same on my F21, we peaked at 19, held 18. Above that it was just blowing a bunch of hot air that gave no performance gain. Still makes somewhere close to 300whp on e85. I wouldn't get too hung up on not hitting boost in the 20's.

[walky_talky20]

Thanks Seerlah! I'll look into that asap, I've never done a wastegate adjustment before, in your experience would it be easier if I pulled the turbo from the car?

I don't know about Mitch, but in my experience, it is much easier to do with turbo and manifold in place. I just drop the cat off the turbo a little ways (3 nuts and disconnect the downpipe-trans mounting).

I mean, of course the adjustment itself is easier if the turbo is just sitting on a table, but removing and reinstalling the manifold or turbo to do this is a lot of unnecessary work. The adjustment isn't visible, but it is plenty accessible.

[B5nDisciple]

Have you actually asked Dave what the tune is shooting for? It might just be that this is exactly how he's set the file up. I've done the same on my F21, we peaked at 19, held 18. Above that it was just blowing a bunch of hot air that gave no performance gain. Still makes somewhere close to 300whp on e85. I wouldn't get too hung up on not hitting boost in the 20's.

That's exactly what I'm hitting, but I know Dave wants to go a bit higher. I'm on E85 with the CTS fmic. Waiting on the second revision too. I think 20 PSI is the goal for now though.

I know Dave said my waste gate spring was softer than usual, so my boost was around 16 on the base file. He increased the N75 duty cycle a bit to get up to 20. I think we're all in the same neighborhood of boost for stock rod setups.
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[MetalMan]

Adjust and tighten your wg actuator rod locking nuts. Common issue with the FT. You will get faster spool and more boost. You are losing it from having a loose wg flapper.

This isn't a problem I've heard of for FTs, or at least the F21 longitudinal variants.

OP: Your boost is pretty typical of how Motoza tunes. On 91 octane he put me around what you're boosting. Of course as mentioned by others a boost leak can also make an impact.

[AudiSport12]

Log on the Motoza software what the requested and actual boost is. I'm touching 21ish and holding around 19. I do need to go back for another revision as I'm seeing some boost surging in the higher RPMs.

[SacSantorin]

Log on the Motoza software what the requested and actual boost is. I'm touching 21ish and holding around 19. I do need to go back for another revision as I'm seeing some boost surging in the higher RPMs.

Ya i did some logs yesterday and actual and requested seem to be matching up. Sometimes the car just feels sluggish though, I think its time for a new clutch. The stock one hasn't started slipping yet but I think its gotta be close.

[PsorianoPre99A4]

Adjust and tighten your wg actuator rod locking nuts. Common issue with the FT. You will get faster spool and more boost. You are losing it from having a loose wg flapper.

Could that be an issue of why i'm not hitting 20-22 psi and at 10 psi?