forge red spring.. haven't received a definite answer

[Molotov]

So yes I know this spring will be strong enough to hold my dv closed when I'm only boosting 21 psi, but can it hurt my turbo? I think my vacuum reading is -25 which isn't enough to open the dv with the 30+ spring?

Don't truly understand it. Thanks for any info, I'm off to go make sure every hose is tighter than a virgin (only holding 17psi on b7)

[A4ringedONE8T]

Softest to Stiffest

Green
Yellow
Blue
Red (30psi IIRC)

And yes, too stiff of a spring will keep the DV from opening, you need yellow, at most yellow and a shim for 21psi, unless of course thats 21psi out a GT42R lol

[Molotov]

haha no worries I'm probably never going to go bigger than gtrs. Could the spring be stopping me from making my 21 psi? I've put the stock one in, and I think I peaked 20psi with it, but not absolutely sure. That thing is going to be destroyed before I can find out.

[A4ringedONE8T]

21psi on a GTRS should need yellow and one spacer

[Mike@Forge]

21psi on a GTRS should need yellow and one spacer

I concur.

Yellow spring by itself, or with one shim.

[Molotov]

yup I picked up the tuning kit.. have been running yellow and 1 shim on 22 psi

[Pr0n]

I'm running a yellow spring (no shims) on APR Stage 1+ (I'm guessing that's fine according to the guide?), but my question is who here is using the RED spring?

[Mike@Forge]

I seriously doubt that many people, if anyone at all on this forum, is using the red spring. Which is why we typically don't include them with the 007P valves.

As the specs. list, we typically find that it is only suitable for higher boost levels, usually exceeding 30 PSI or more. Of all of the different applications that we make application specific valves for, over 50 at this point, rarely ever does any one of them use the red spring.

On very few occasions, I have seen people with Mitsubishi Evos use them, but only when they're using a larger than stock turbo and running really high boost as well as using race gas and running meth injection. It's typically just too stiff of a spring for the boost levels seen on most applications and would actually prevent the valve from opening properly in most cases.

[F16HTON]

I run one yellow and that is it with my 004...always performs flawlessly. It is a good idea to keep them clean and lubricated with Mobil 1 synthetic grease.

I clean mine with every oil change.

[05A$SE]

is it bad if i'm running stage 1 with the yellow spring no shim? thats what the APR guy told me to run. Its a forge stealth valve BTW

[diagnosticator]

is it bad if i'm running stage 1 with the yellow spring no shim? thats what the APR guy told me to run. Its a forge stealth valve BTW

It's not bad if that works for your setup. In general , the lightest spring possible that keeps the DV closed during boost, provides for best DV response. The difference between spring rate and spring preload must be considered during DV setup, increased preload effects overall response, but differently compared to a stiffer spring.

[fourings06]

Straight from the forge site.

If you are finding that the valve is dumping more than required or you are loosing boost pressure it is normally an indication that a stronger spring is required. Conversely if the valve is failing to dump it may be necessary to install a weaker spring. If during this tuning of your valve you are faced for example with the red spring being to strong and the blue spring to weak, you can add the spacers to the blue spring to increase the tension by small increments, thus achieving a setting between the red and blue springs.

Valve Spring color coding


Green - 5-15 PSI


Yellow - 15-23 PSI


Blue - 23-30 PSI


Red - 30 + PSI


The above figures are estimates only and should only be considered as a guideline

Please note - fitting a stronger spring into a valve will not increase boost pressure unless existing pressure is being lost. Failure to allow the valve to operate by installing a spring which is to strong may cause damage to the turbocharger.

Please note - the red coded springs should not be installed in the DVR or DV007 diaphragm valves

[mdzaudi]

Its generally advised to use a yellow spring for 1+ correct? Because i've heard you hold 14-15psi but spike around 19-21psi.

[fourings06]

Its generally advised to use a yellow spring for 1+ correct? Because i've heard you hold 14-15psi but spike around 19-21psi.

I use yellow on stg 2+, but I would use yellow at 1+ as well.

[B6Lovin]

fwiw - if you're using the red spring you probably need something bigger than the ports on a forge will allow, and it might also be time to start thinking about not recirculating that air... (aka - going MAFless, putting a BOV closer to the throttle body, etc)