[dekes1]

Originally Posted by Jason@JacFab

Lol, the bypass is still fully functional. Just not leaking. We are working on what will be the final "Pre-production" prototype now. Theoretically we're hoping to have one to Gino for independent testing by the end of next week? Or maybe it's the following week. Anyway, soon. Very soon. We are still testing some different materials for some of the internals, have to get that nailed down, do some longevity testing, road miles, etc, and then it's off to production.

Its so pleasing to hear about a genuine product that provides proven value through proper testing. We all have seen the LTG "blow off valve spacer" for sale by that fella on Youtube that is nothing but a noise maker. And the fact that the air released by that product becomes unmetered, causing an instantaneous rich condition and likely watering down cylinder walls just makes me shake my damn head.

[ryansalazan24]

Originally Posted by dekes1

Its so pleasing to hear about a genuine product that provides proven value through proper testing. We all have seen the LTG "blow off valve spacer" for sale by that fella on Youtube that is nothing but a noise maker. And the fact that the air released by that product becomes unmetered, causing an instantaneous rich condition and likely watering down cylinder walls just makes me shake my damn head.

I just saw that video the other day and was thinking the exact same thing. Like uhh, now the metered air is all thrown off unless tuned for that?

[Jason@JacFab]

After a lot of playing around, I can also confirm that the stock GM tune is built around the leaky POS valve, and I occasionally get a check engine light with the prototype on the car... While it is unfortunate for people with a stock tune that are going to have to look at this check engine light if the part is installed, I need to try it on my tuned ecm, as I have just been trying it on the stock tune ecm. Generally as when tuned, the boost coming on is more aggressive, it may not throw a check engine light. If it does I'm sure the tune can be tweaked to accommodate, or just disable the one code that gets thrown.

[Start The Machine]

Originally Posted by Jason@JacFab

After a lot of playing around, I can also confirm that the stock GM tune is built around the leaky POS valve, and I occasionally get a check engine light with the prototype on the car... While it is unfortunate for people with a stock tune that are going to have to look at this check engine light if the part is installed, I need to try it on my tuned ecm, as I have just been trying it on the stock tune ecm. Generally as when tuned, the boost coming on is more aggressive, it may not throw a check engine light. If it does I'm sure the tune can be tweaked to accommodate, or just disable the one code that gets thrown.

Jason, are you noticing any gains from this on the stock tune? If so, what are you seeing?

[Jason@JacFab]

No dyno numbers, but I am experiencing much better throttle response, and increased acceleration speed. It's definitely noticeable, and positive.

I need to do some logging before/after the install to compare how quickly boost builds, but its definitely faster.

Currently I have the stock valve back on the car as we are reworking the prototype (again)

[dekes1]

Originally Posted by Jason@JacFab

After a lot of playing around, I can also confirm that the stock GM tune is built around the leaky POS valve, and I occasionally get a check engine light with the prototype on the car... While it is unfortunate for people with a stock tune that are going to have to look at this check engine light if the part is installed, I need to try it on my tuned ecm, as I have just been trying it on the stock tune ecm. Generally as when tuned, the boost coming on is more aggressive, it may not throw a check engine light. If it does I'm sure the tune can be tweaked to accommodate, or just disable the one code that gets thrown.

What DTC are you getting? Almost all the DTCs can be individually turned off in the tune unless it has value being present for other conditions.
Depending on the code, you may be able to adjust the thresholds without disabling the DTC. eg overboost error.

[Jason@JacFab]

Originally Posted by dekes1

What DTC are you getting? Almost all the DTCs can be individually turned off in the tune unless it has value being present for other conditions.
Depending on the code, you may be able to adjust the thresholds without disabling the DTC. eg overboost error.

I'm not getting any kind of overboost error codes (if they are any? never looked). I'm getting a P2261, Turbo Bypass Valve - Mechanical

When google searching the code, only thing I can find that makes any sense is:

"When the boost pressure is higher or lower than the predetermined specifications, the PCM will store the P2261 trouble code, and the Check Engine Light will come on."

[cooper1965]

P2261 is a very specific code. Turbocharger bypass valve stuck. That would make sense, its waiting for the junk stock plastic one too leak.
I'm a huge fan of fixing that problem. Any rough time frame on your valve coming to market Jason@JacFab?

[Start The Machine]

Please forgive my stupidity, is the CEL/DTC something you can just clear with a cheap bluetooth obd2 code reader? Will the CEL/DTC just keep coming back on after its cleared?

[Jason@JacFab]

Originally Posted by Start The Machine

Please forgive my stupidity, is the CEL/DTC something you can just clear with a cheap bluetooth obd2 code reader? Will the CEL/DTC just keep coming back on after its cleared?

Yes, it can be clearer, and yes it will keep coming back. On a stock tune, I’m guessing the only way to keep the night off is to reintroduce the leak. Maybe not completely fix the leak, but make it less leaky...

We don’t really want to do that though. But maybe that could be an option. Maybe we will try it.


Sent from my iPhone using Tapatalk

[dekes1]

Actually that's a blessing in disguise. P2261 is specific enough to the valve, that disabling the DTC altogether is a safe approach.

Here's the option in HPT:

[Jason@JacFab]

Originally Posted by dekes1

Actually that's a blessing in disguise. P2261 is specific enough to the valve, that disabling the DTC altogether is a safe approach.

Here's the option in HPT:

Yeah, I looked at that yesterday. It will be no big deal to disable on tuned cars, but there's a chance with a tune, it might not come on anyway, will have to test. Mainly I was just talking about the CEL stuff above for stock tuned cars.

[Jason@JacFab]

Originally Posted by cooper1965

P2261 is a very specific code. Turbocharger bypass valve stuck. That would make sense, its waiting for the junk stock plastic one too leak.
I'm a huge fan of fixing that problem. Any rough time frame on your valve coming to market Jason@JacFab?

I keep hoping within the next month or so, but we keep running into little issues that we have to go back and fix.

As a side note, although I appreciate the offers to test the parts we make, I get so many people asking to test the stuff, that if I gave everyone that asked something to test, we would just end up going out of business. I already have a couple independent testers lined up, if I feel like I need more, I will reach out to people.

[cooper1965]

^You would think that would be common sense.