VMP Odin (boost issue?)

[Spykexx]

Well, turns out we have a test and tune tonight as well, even though they never put it on the schedule. Ended up making a few changes.
- Retightened everything, there was a decent bit that could be had on intake-TB coupler.
- Rerouted the cross coolant tube, it was run over the TB, and was slightly getting pinched with the hood closed. I think this was allowing a bit more heat than anticipated.
- Unfortunately, boost gauge wasn't here on time to get it in (Nor do I have the adapter for Forscan). Thanks Amazon -.-
- Going to try running a little less pressure in the NT555R2's. And this time remembering to take the gauge with me for checking between runs lol.

But after doing the retighten, and coolant hose, watching the dash vacuum, on tip in it goes to zero FAR faster than previously, so I wonder if I had a small intake leak throwing it off.

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[Spykexx]

Alright, so we're back at squarish one. Test and tune went pretty badly. I did end up trapping faster (122) but still couldn't break out of the 12s. It is absolutely just dying when getting launched (boost seems to agree)

So my boost gauge FINALLY showed up and got it installed. Definitely have something going on with my boost.

I'm making no low down boost. I don't really start seeing positive till like 4,000 rpm or so and in second gear I'm maxing out at 7 psi. 1st gear I maxed out at 2 psi.

This generally shows exactly how it feels. Like it has nothing extra down low. In second gear, you got WOT at like 3k? It just casually accelerates.

 

[mepawn]

Alright, so we're back at squarish one. Test and tune went pretty badly. I did end up trapping faster (122) but still couldn't break out of the 12s. It is absolutely just dying when getting launched (boost seems to agree)

So my boost gauge FINALLY showed up and got it installed. Definitely have something going on with my boost.

I'm making no low down boost. I don't really start seeing positive till like 4,000 rpm or so and in second gear I'm maxing out at 7 psi. 1st gear I maxed out at 2 psi.

This generally shows exactly how it feels. Like it has nothing extra down low. In second gear, you got WOT at like 3k? It just casually accelerates.

Interesting. Try smoke testing the supercharger. Im also leaning towards there being an issue with the bypass valve. In the vmp gen3r its a valve actuated by boost or vacuum that flips a bypass in the supercharger.
If those lines are kinked, crushed, or the bypass is bad/ leaking it can creat this issue where the supercharger struggles to build boost like in your case. I think thats the most likely culprit.

 

[Spykexx]

Interesting. Try smoke testing the supercharger. Im also leaning towards there being an issue with the bypass valve. In the vmp gen3r its a valve actuated by boost or vacuum that flips a bypass in the supercharger.
If those lines are kinked, crushed, or the bypass is bad/ leaking it can creat this issue where the supercharger struggles to build boost like in your case. I think thats the most likely culprit.

I checked out the bypass. There's not really a way for it to kink on the odin. It's like 2 inches of vacuum line, that is taken from the TB right next to the valve. And from my understanding, if it did fail (it does still operate. I've watched it do so while wife hits the throttle), it would fail in the closed state. But at slight tip in, it closes it as it should (at least with hood open). Now could the adjustment be off to not close all the way? Possibly but not sure how to even test that as it's internal.

Also curious why it would be so inconsistent as well. 1st gets 2 psi, second gets 7 (also backed up by tuner). This maybe makes me lean on belt slip?

 

[engineermike]

It’s either….bypass valve, extreme belt slip, or the throttle isn’t opening. But without a log it’s just guessing.

 

[tdstuart]

Belt slip should leave belt dust on the pulleys from what I know

 

[Spykexx]

It’s either….bypass valve, extreme belt slip, or the throttle isn’t opening. But without a log it’s just guessing.

It was logged to tuner. He said everything looked great except low boost maxing around 7 psi.

 

[Spykexx]

Belt slip should leave belt dust on the pulleys from what I know

I haven't noticed NEW shreds. There's shreds all over from a failed pulley destroying the previous belt

 

[engineermike]

It was logged to tuner. He said everything looked great except low boost maxing around 7 psi.

This is very basic but you can’t expect the forum to be able to really diagnose it without a log. It absolutely blows my mind that these paid tuners hold your log, let alone your tune, hostage.

 

[Spykexx]

This is very basic but you can’t expect the forum to be able to really diagnose it without a log. It absolutely blows my mind that these paid tuners hold your log, let alone your tune, hostage.

I get it, you already said that before, not sure why you're coming at me for it. Was just looking for tips and places to dig into it. I didn't do any of the work, I didn't even own the car when it was installed. The tune was purely to finally get it into a tune that I knew, as I had no idea what the original was. This specific car is new to me, and currently learning to work through whatever issues the new car has.

 

[engineermike]

I get it, you already said that before, not sure why you're coming at me for it. Was just looking for tips and places to dig into it. I didn't do any of the work, I didn't even own the car when it was installed. The tune was purely to finally get it into a tune that I knew, as I had no idea what the original was. This specific car is new to me, and currently learning to work through whatever issues the new car has.

I'm just saying that you're trying to diagnose a problem in a modern mustang without the single most useful and valuable tool. And it's not really your fault, per se, it's the way "we" let the tuners lock us out of the tune and now log data as well. You're paying your tuner who hasn't been able to help you, but you don't have access to the log to help yourself or get anyone else to help you. It's very much a guessing game without the log.

 

[Spykexx]

So apparently the way to get the logs out for mine was just continually failing on the device but I did manage to snag one from this morning! @engineermike

 

[HKusp]

You should be seeing 10+lbs of boost out of that thing. You should see waaay more than 2psi in 2nd gear.

 

[Spykexx]

You should be seeing 10+lbs of boost out of that thing. You should see waaay more than 2psi in 2nd gear.

I see 7~ lbs of boost in second gear. 2 lbs of boost in first gear.

And I definitely agree. But definitely explains why it feels like a stock coyote pulling in first, it basically is

The thing that really makes me scratch my head (And my experience with PD comes from my ZL1, not coyote, so the torque band is definitely different), but if you pin the throttle at 2500-3000, or really anywhere...you'd expect it to go. I could melt the tires on the ZL1 in first and second whenever I wanted really. You can't in this car. Am I wrong in thinking that from the coyote? It feels backwards to me, zero boost down low, and standard torque even with the PD blower until like 4+K RPM.

Hell, it came with PS4S's on it, and they held perfect traction really, and it was in the 50s or so then. In my mind, in no realm, should a PD blower car get traction with a 340TW tire WOT. If I smash the pedal in second at 3,000 RPMs, it just meanders about like a stock coyote until it picks up. Boost gauge shows nada till like 4,000, and slowly builds.

 

[robvas]

Long term fuel trims over 1.20? What's going on there

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