HYDE161
Go Kart Champion
It's been a while since my original HYDE16 Reviews - GFB T9351 DV+ Diverter Valve Kit post and there has been plenty of discussion and feedback on using this GFB T9351 DV+ Diverter Valve Kit. Some get soft codes, some remove the main spring, some notice better drivability while some don't notice any change. Some software tuners advise against using it, some say it doesn't matter. But let's add some stats to it, I've been thinking about a poll thread like this for a while to come to some sort of conclusion. The poll will cover the possible configurations while your posts will help compile overall feedback.
Vote in the poll and then reply to this thread with the following questions and answers:
Manual or DSG =
Turbo setup (IHI/K03, K04, BT) =
Software used (company and version/level) =
Have you received a soft code with the main spring left in =
Data comparisons (can you share any before and after logs) =
Overall feedback and impressions =
Your current configuration (choose from the numbered options below) =
1) DSG with DV+ main spring in OEM location
2) DSG with DV+ main spring and DV relocation kit
3) DSG without DV+ main spring in OEM location
4) DSG without DV+ main spring in and DV relocation kit
5) Manual with DV+ main spring in OEM location
6) Manual with DV+ main spring in and DV relocation kit
7) Manual without DV+ main spring in OEM location
8) Manual without DV+ main spring in and DV relocation kit
GFB T9351 DV+ Configuration / Tech Tip:
Just as a reference for the main spring we refer to, the GFB T9351 DV+ can be configured in two different ways depending on your own personal preference and what you want to achieve. During assembly, you can choose to install the main piston spring (indicated below by the arrow) or not.
Customer Service Response to GFB T9351 DV+ Configuration / Tech Tip:
After reading this Tech Tip, I reached out to GFB’s excellent customer service for a little more clarification. Their customer service response is listed below.
We recommend using the main spring unless there is a reason not to, so that throttle response is optimized, since that’s one of the key reasons to replace the factory valve (as well as longevity and boost-holding). As the tech article explains, the turbo will make a different sound under certain conditions at low RPM (only noticeable with an aftermarket intake), which is not compressor surge and is not harmful to the turbo or engine, but nonetheless some people may not like it. In that case, removing the spring will make the DV+ behave like the factory valve, so the different noise will be gone.
The boost pressure and turbo are fairly irrelevant as far as the main spring go. You could potentially say as a blanket rule to the guys with a DSG gearbox that they can install the DV+ without the spring, because throttle response on gearshift is much less important than it is to the manual guys. Personally however, I’d always take the opportunity to improve throttle response by installing the spring and taking it out if necessary, rather than not installing it and never knowing potentially what I’m missing. That’s really the whole point of modifying something. There’s absolutely no harm in trying it – the worst that will happen is you don’t like the noise in which case you take it out.
