Unitronic IS38 Tune - not what I expected

[Diggs24]

Because BOVs are dumb.

 

[Acadia18]

Bro your tuner is telling you to do it, just do it

 

[jay745]

It's going to cause you more problems than anything as you already stated. Especially on a small is38 turbo

 

[EpicTech]

I like whooshie sounds though, can I least have a spacer on the OEM DV, like I had before?

 

[mrmatto]

Seems to me at this point you ought to be eliminating variables. You can always go back to it once you get the tune sorted.

 

[EpicTech]

Fair enough. I will have to order one though.

 

[Diggs24]

You can put whatever you want on it when we are done tuning.

 

[jay745]

I like whooshie sounds though, can I least have a spacer on the OEM DV, like I had before?

If you're looking for optimal performance I wouldn't use a spacer. Whooshie noises or dialed in performance. Pick one

 

[EpicTech]

Roger that

 

[Dog Dad Wagon]

Why do you say that ?

Factory DV is a critical component of the ECU’s boost control mechanisms. The factory DV is not a weak point in the system. Aftermarket BOVs operate differently thus creating unintended side effects, like staying shut longer than the ECU wanted, or opening more than the ECU eanted.

 

[EpicTech]

Well I know its a critical component, but saying the factory is better than an aftermarket brand that is notoriously noted for working well with modified cars ( had one on my Supra).. well Im gonna have to see logs for myself and compare the differences before I agree with that.

 

[Dog Dad Wagon]

Well I know its a critical component, but saying the factory is better than an aftermarket brand that is notoriously noted for working well with modified cars ( had one on my Supra).. well Im gonna have to see logs for myself and compare the differences before I agree with that.

I believe wholeheartedly that, historically speaking, DV/BOV “upgrades” have added value to a build. The EA888 Gen 1/2 motors on the MK5/MK6 had poor factory DVs - it was a common upgrade to get the GoFastBits DV+, because the factory part wasn’t up to the task with higher boost.

That is simply not the case with the EA888 Gen 3/MK7 DV. Like many other aspects of the motor, the Gen 3 introduced design revisions based on 10 years of warranty work and documented issues with the Gen1/2 motors. The DV is 100% capable for all but the most involved (500HP+) builds.

I promise - reverting to stock DV will improve driveability / smoothness / performance.

 

[jay745]

I believe wholeheartedly that, historically speaking, DV/BOV “upgrades” have added value to a build. The EA888 Gen 1/2 motors on the MK5/MK6 had poor factory DVs - it was a common upgrade to get the GoFastBits DV+, because the factory part wasn’t up to the task with higher boost.

That is simply not the case with the EA888 Gen 3/MK7 DV. Like many other aspects of the motor, the Gen 3 introduced design revisions based on 10 years of warranty work and documented issues with the Gen1/2 motors. The DV is 100% capable for all but the most involved (500HP+) builds.

I promise - reverting to stock DV will improve driveability / smoothness / performance.

Spot on with this. Even after the early dv's on the mk5/6 had issues...the hype about dv+ came about only to come around again that the latest revision D was the winner. Sometimes oem is the best choice and this is the case here. Just because aftermarket exists doesnt mean it's better.

 

[Acadia18]

Oh c'mon.

Ain't nobody gonna link it?















Fine. I will


https://mygolfmk7.com/2021/10/stock-dv-versus-bov/

 

[EpicTech]

I believe wholeheartedly that, historically speaking, DV/BOV “upgrades” have added value to a build. The EA888 Gen 1/2 motors on the MK5/MK6 had poor factory DVs - it was a common upgrade to get the GoFastBits DV+, because the factory part wasn’t up to the task with higher boost.

That is simply not the case with the EA888 Gen 3/MK7 DV. Like many other aspects of the motor, the Gen 3 introduced design revisions based on 10 years of warranty work and documented issues with the Gen1/2 motors. The DV is 100% capable for all but the most involved (500HP+) builds.

I promise - reverting to stock DV will improve driveability / smoothness / performance.

Thanks, I am aware the current EA888 Gen 3 and it OEM DV is the cats meow. I am going to put a stock one back for the sake of removing variables of error until the car is dialed in via OS tuning.