The Go Fast Bits (GFB) DV+ - Fiat 124 Spider Forum
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post #1 of 128 (permalink) Old 10-08-2016, 12:58 PM Thread Starter
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The Go Fast Bits (GFB) DV+

I am getting a lot of questions from forum members about the GFB DV+

It's a good product, but I think it's a bit misunderstood. Let's take a look at it.



The GFB DV+ is a direct replacement part for the stock diverted valve. It differs only slightly in design from the stock part, but significantly in quality of components.

So what is a Diverter Valve? In the old days it was called a bypass valve, or a blow off valve, but it's a little more sophisticated. The diverter valve is an ECU controlled valve that relives air pressure in the intercooler and associated piping by opening up under specific conditions and venting that air back into the turbo's intake port. It does this in two situations. First it opens up when the car is on boost and the driver closes the throttle. Second it happens of the ECU feels it needs to open the valve to protect the engine. For example it would do this if the boost line came off of the wastegate actuator, or some other malfunction caused an overboost. (I'm simplifying here)

The factory diverter valve works pretty well. It responds fast enough to offer the protection it should, and when it's closed it doesn't leak too badly. However it does leak, meaning that the turbo has to work a little harder than it otherwise would to create air pressure that's wasted.This leaking causes a very small delay in the time it takes the turbo to spin up, and costs a very small amount of power when on boost.

The GFB valve when closed leaks less than the stock valve. Thus the turbo can spin up a little faster and at least in theory power on boost will be a little higher. However as compared with a stock valve that's in good condition and operating properly, the differences are very slight, so slight that only people really in tune with their car will have a chance of noticing.

Now, IF the stock valve, which is pretty low quality, isn't perfectly healthy, you will notice a difference when swapping in the GFB part. When you hear about someone putting in a GFB and raving about the improvement, it's usually because there was something wrong with the stock valve. The GFB valves seem to last forever so they give very consistent reliable performance.

In the 500 Abarth world the GFB valves are very popular. They are also very popular on a lot of other European turbo cars. It's a good product, just don't expect a big change in power as compared with a properly working stock valve.

We have them at EC, they are here: https://shopeurocompulsion.net/colle...o-fast-bits-dv

Greg

eurocompulsion.net

Last edited by Greg; 10-08-2016 at 01:02 PM.
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post #2 of 128 (permalink) Old 10-08-2016, 01:02 PM
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Hey Greg - question.

How difficult is the install? Been debating whether I should get this now, or wait until I get more familiar with the car. Would you recommend a first-timer doing the install themselves?
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post #3 of 128 (permalink) Old 10-08-2016, 01:19 PM Thread Starter
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It's easy to install, especially on the 124. I think that's part of the reason for it's popularity.

Greg
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post #4 of 128 (permalink) Old 10-08-2016, 01:54 PM
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great writeup!
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Chris

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post #5 of 128 (permalink) Old 10-08-2016, 02:06 PM
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Originally Posted by ThaVerge View Post
Hey Greg - question.

How difficult is the install? Been debating whether I should get this now, or wait until I get more familiar with the car. Would you recommend a first-timer doing the install themselves?
I am at home with dynamos, point and SU carbs ( ask your Dad ).
These new engines need a laptop more than my tool kit - but I have just fitted the GFB DV+ 15 mins from start to finish. It as easy as it gets on modern engines. My expectations were exactly as Greg indicated - Not an increase in power but a more consistent response especially at low revs. It works for me.
Danny
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post #6 of 128 (permalink) Old 10-08-2016, 02:34 PM Thread Starter
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I am at home with dynamos, point and SU carbs ( ask your Dad ).
I'm old enough to know what all that stuff is, although we never had SU carbs on Fiats or Alfas, that was a British car thing.

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These new engines need a laptop more than my tool kit - but I have just fitted the GFB DV+ 15 mins from start to finish. It as easy as it gets on modern engines. My expectations were exactly as Greg indicated - Not an increase in power but a more consistent response especially at low revs. It works for me.
Danny
I'm glad you like it. You used the term "more consistent" that's a very good way to put it. As the stock valve opens and closes it doesn't always close consistently, the GFB is much more consistent. I forgot to point that out.

Greg

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post #7 of 128 (permalink) Old 10-20-2016, 09:10 PM
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I'm old enough to know what all that stuff is, although we never had SU carbs on Fiats or Alfas, that was a British car thing.



I'm glad you like it. You used the term "more consistent" that's a very good way to put it. As the stock valve opens and closes it doesn't always close consistently, the GFB is much more consistent. I forgot to point that out.

Greg
I added the GFB to my Lusso and find that boost seems to come on a little earlier and smoother. Does that make sense?

The only difficulty in the installation was that I had to remover the V1 intake tube because it is thicker than stock and made the GFB a tight fit. Once the GFB was on, the V1 intake tube went back on with only a little coaxing into the narrowed gap between the GFB and the turbo.

John

2017 Fiat 124 Spider, Aluminum Lusso AT, CravenSpeed Stubby antenna, LED interior& trunk lights, V4 intake, GFB DV+, EC EDL (Race+), Burger Tuning catch can, WeatherTech floor and cargo mats, CoverKing cover (from GWR), Advanti DST Storm S1 17 (40 mm offset), Michelin Pilot Super Sport, Ruger LCP

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post #8 of 128 (permalink) Old 10-20-2016, 11:14 PM Thread Starter
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I added the GFB to my Lusso and find that boost seems to come on a little earlier and smoother. Does that make sense?
That does make sense. It's not so much that it's giving you more power, but it gives it too you a little sooner, and smoother.

Quote:
Originally Posted by JFernald View Post
The only difficulty in the installation was that I had to remover the V1 intake tube because it is thicker than stock and made the GFB a tight fit. Once the GFB was on, the V1 intake tube went back on with only a little coaxing into the narrowed gap between the GFB and the turbo.
That is true, The GFB valve is bigger than the stock valve. Our intakes are made from thicker materiel than the stock intakes, so when you combine them, there isn't much room left. They do fit together though. I suggest putting the clamp on first, then sliding the intake onto the turbo inlet and into the clamp. Coating the intake area near the clamp with dish soap and water makes it really slippery and it goes on easily.

Greg

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post #9 of 128 (permalink) Old 11-29-2016, 09:01 PM
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I just got the GFB DV+ today and it took maybe 10 minutes to install. I did not even have to change out of work duds. You will need a 5mm hex driver and maybe an extension to get at that bottom screw. While I cannot claim any power gains, it does seem to have smoothed the power under boost out. I'm surprised as how ill fit the factory valve was. There was a lot of slop in the factory piston. Overall, I'm happy with the money spent and may do the same mod to my wife's N55 engine in her car. It looks like the same valve would fit that too.
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Tim

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post #10 of 128 (permalink) Old 12-02-2016, 10:56 AM
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@Greg : I'm thinking about ordering the GFB DV+. The order page has an option for 'Extended Bolts'. Do I need extended or standard bolts for a 124?

Thx, S
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