[F87source]

Originally Posted by Zeese

Thread hijack!

Seems I may finally get around to installing the GFB DV+

How did you know about some "early" versions having too long a plunger spring?

Purchased from Mike@XPH.
Specs or part nos. would be cool.

Thanks!

I talked to gfb.

The earlier versions had a plunger spring that was too long causing soke issues with the solenoid not being able to retract the plunger when needed this causing some codes. Gfb realized the issue and rectified it, this was a long time ago so there very little possibibility of getting an old version. You could always measure the spring and send it to gfb for verification.

[Zeese]

Originally Posted by F87source

I talked to gfb.

The earlier versions had a plunger spring that was too long causing soke issues with the solenoid not being able to retract the plunger when needed this causing some codes. Gfb realized the issue and rectified it, this was a long time ago so there very little possibibility of getting an old version. You could always measure the spring and send it to gfb for verification.

Good knowledge. Thanks!

The spring measured 36mm long. GFB shared back with me that the spring length in the newer kits is 32-33m long. Awaiting word on next steps.

[F87source]

Originally Posted by Zeese

Good knowledge. Thanks!

The spring measured 36mm long. GFB shared back with me that the spring length in the newer kits is 32-33m long. Awaiting word on next steps.

I see, so you did get an old version. My spring was 31.22 mm (probably some extremely minor error in that measurement so likely it is 32mm) long so I have the new version.

[wilxuup]

Just wanted to throw some thanks to this thread. Did the MST V2 with Turbosmart DV a few months ago. Prior mods include charge pipe, Dinan Intercooler, -Cat DP w/ Tune. I agree, better throttle response and top end.

Something cool that I haven't seen anyone mention is that it changes the induction noise above 3.5K RPM on slow progressive pulls with a throatier sound. I didn't notice this until a few weeks ago while in 6th or 7th giving it a little bit more throttle to catch up to traffic.

[Zeese]

Originally Posted by F87source

I see, so you did get an old version. My spring was 31.22 mm (probably some extremely minor error in that measurement so likely it is 32mm) long so I have the new version.

Thought to memorialize info from GFB.

We made a small change to the plunger spring length back in 2019, as we found some cars using the T9357 have weaker solenoids than other types using electronic diverter valves.

We use the same plunger and spring in all of our DV+ models, but we found when the coil on the factory solenoid in the M2 gets hot, the magnetic strength was less than others and in some cases it could not pull the plunger open. It was a rare set of conditions that caused this, but shortening the spring slightly reduced that possibility to zero.

Looking at the design (and marketing collateral), I would guess there is better throttle response with or without the spring.

MST V2 content (finally)! I hope to install the DV+ and the MST V2 in June. Mann Tracht, Un Gott Lacht.

[F87source]

Originally Posted by Zeese

Thought to memorialize info from GFB.





Looking at the design (and marketing collateral), I would guess there is better throttle response with or without the spring.

MST V2 content (finally)! I hope to install the DV+ and the MST V2 in June. Mann Tracht, Un Gott Lacht.

Interesting I might have gotten that updated spring length version then, but I have no issues to report with my gfb dv+ - no codes or compressor surge at all.


I think you're confusing the plunger spring for the piston spring. The plunger spring is absolutely necessary because it is responsible for holding the plunger closed against the base plate allowing for the piston to transfer boost to the back side allowing it to be forced against the opening of the turbo to seal and hold boost. The piston spring is optional, where if you use it, it will allow for the piston to stay shut and hold a little bit extra boost in the charge pipe allowing for better response.

[///M TOWN]

Originally Posted by wilxuup

Just wanted to throw some thanks to this thread. Did the MST V2 with Turbosmart DV a few months ago. Prior mods include charge pipe, Dinan Intercooler, -Cat DP w/ Tune. I agree, better throttle response and top end.

Something cool that I haven't seen anyone mention is that it changes the induction noise above 3.5K RPM on slow progressive pulls with a throatier sound. I didn't notice this until a few weeks ago while in 6th or 7th giving it a little bit more throttle to catch up to traffic.

I noticed that on the first drive with the MST

The TurboSmart enhances the entire equation

I did TS 8 months after the Inlet - I'm impressed

[Zeese]

Originally Posted by F87source

I think you're confusing the plunger spring for the piston spring. The plunger spring is absolutely necessary because it is responsible for holding the plunger closed against the base plate allowing for the piston to transfer boost to the back side allowing it to be forced against the opening of the turbo to seal and hold boost. The piston spring is optional, where if you use it, it will allow for the piston to stay shut and hold a little bit extra boost in the charge pipe allowing for better response.

Understood. Thanks for straightening me out on this.

[F87source]

Originally Posted by Zeese

Understood. Thanks for straightening me out on this.

No problem! Just didn't want you to pull that plunger spring and have major issues.

[emiliano1]

Hello, I want to put an mst brand inlet, but I can't decide whether to put v1 or v2, I have a stock turbo and I don't plan to change it. I read many photos and they say that the v2 works well with the original turbos, but I also saw in another forum that the stock turbo is small inside and makes a shock with the v2 inlet. Is there really an improvement installing v2 in a stock turbo or should I go directly for v1? Thank you very much!

[F87source]

Originally Posted by emiliano1

Hello, I want to put an mst brand inlet, but I can't decide whether to put v1 or v2, I have a stock turbo and I don't plan to change it. I read many photos and they say that the v2 works well with the original turbos, but I also saw in another forum that the stock turbo is small inside and makes a shock with the v2 inlet. Is there really an improvement installing v2 in a stock turbo or should I go directly for v1? Thank you very much!

Yes go with v2, you want the widest possible inlet to eliminate as much restrictions as possible, it also future proofs you incase you upgrade turbos in the future. Imo the v1 isn't worth the cost.

[///M TOWN]

Originally Posted by F87source

Yes go with v2, you want the widest possible inlet to eliminate as much restrictions as possible, it also future proofs you incase you upgrade turbos in the future. Imo the v2 isn't worth the cost.

Did you mean the V1 isn't worth the money?

[F87source]

Originally Posted by ///M TOWN

Did you mean the V1 isn't worth the money?

Oh crap, yes you are correct I made a typo.

[///M TOWN]

Originally Posted by F87source

Oh crap, yes you are correct I made a typo.

Thought so

[AmuroRay]

No idea why the V1 is even sold. I feel bad for anyone who mistakenly bought it.

[///M TOWN]

Originally Posted by AmuroRay

No idea why the V1 is even sold. I feel bad for anyone who mistakenly bought it.

Agreed ‼️

[M2RAW]

Originally Posted by ///M TOWN

Agreed ‼️

Where do you guys buy it from?

[///M TOWN]

Originally Posted by M2RAW

Where do you guys buy it from?

https://x-ph.com/mst-bmw-n55-3-0-tur...e-bw-mk3352v2/

[M2RAW]

Originally Posted by ///M TOWN

https://x-ph.com/mst-bmw-n55-3-0-tur...e-bw-mk3352v2/

Thank you sir

[Zeese]

Originally Posted by F87source

No problem! Just didn't want you to pull that plunger spring and have major issues.

And... pics of the new spring vs. the old spring, and packaging.

[F87source]

Originally Posted by Zeese

And... pics of the new spring vs. the old spring, and packaging.

Nice! Glad you got the new spring!

[AmuroRay]

Originally Posted by Zeese

And... pics of the new spring vs. the old spring, and packaging.

Why didn’t you go with the TS unit? Just curious.