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Old 13th August 2019, 08:46 PM   #1 (permalink)
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GTR Dump Valves/BOV's - Thoughts?

Just wondering what people/owners think of these on the R35's. Do they sound, dare I say, a bit chavish?? Had them on my old Cosworths, Evos, Subarus etc, but not sure about the R35?

Obviously, they serve a purpose I know and above a 4.25/1.3 bar the OEM valves are prone to blowing open, so it's a decent upgrade on a modded car in that respect which would be why I would get some on my 4.25. But, the OEM's one's are more than capable at this level of tune?

Spoke to Iain at Litchfield and he says it's just the sound and they look good, no real other benefits and he would be happy to adjust the map on the car to suit. SVM however said they are a very popular upgarde and hold boost much better with the upgraded units on and the OEM one's will eventually fail.

Thoughts?
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Old 13th August 2019, 09:10 PM   #2 (permalink)
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You wonít get to hear it much. Swaps cogs in milliseconds
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Old 13th August 2019, 10:23 PM   #3 (permalink)
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You wonít get to hear it much. Swaps cogs in milliseconds
This has stopped me fitting a pair myself.

I fitted dumo valves to my Esprit V8 and Noble and I love the sound. But of ocurse with a manula box you can deliberatly hold the revs and slow down teh gear chnage for maximum pssstttt !!
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Old 15th August 2019, 05:58 PM   #4 (permalink)
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The oem ecu uses the MAFs as the primary load reference, dumping air out the system means the load calcs are off and the clutch control/fuelling/ignition timing goes seriously off, especially if the atmo bovs float open at part throttle conditions.
Some aftermarket atmo bovs do appear to keep the oem setup behaving.. just. But from a technical point of view I wouldn't advise running them unless the car has been remapped on SD.

To add... The stock ones work just fine up to around 1.6 bar boost. at which point you're already on aftermarket turbos, probably intercooler and piping and most likely on SD too... Speak to your tuner.
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Old 17th August 2019, 09:54 AM   #5 (permalink)
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Originally Posted by ACspeedtech View Post
The oem ecu uses the MAFs as the primary load reference, dumping air out the system means the load calcs are off and the clutch control/fuelling/ignition timing goes seriously off, especially if the atmo bovs float open at part throttle conditions.
Some aftermarket atmo bovs do appear to keep the oem setup behaving.. just. But from a technical point of view I wouldn't advise running them unless the car has been remapped on SD.

To add... The stock ones work just fine up to around 1.6 bar boost. at which point you're already on aftermarket turbos, probably intercooler and piping and most likely on SD too... Speak to your tuner.
Yeah, had already spoke to Litchfield.

Iain said they have never had any problems with the Turbosmart valves, even on VTA if mapped correctly. I would no doubt have ran them in recirc' mode like the OEM valves. But yeah, I am aware the a lot people run them on SD....

My car has just been mapped by Iain on Feb' this year on Ecutek V7 where he commented on the how the car is running well, so just going to leave things as they are until I change turbos/pumps etc.

Thanks for the feedback
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Old 17th August 2019, 10:23 PM   #6 (permalink)
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ive just got a pair of gfb hybrids, these come with various fittings to either fully recirc , fully dump to atmosphere or half and half with the recirc port opening slightly sooner. I simply don't like the sound of these so ill be putting these up for sale for £300 delivered . they cost me £335 and been run on the car for a couple of hrs max. instead of going full recirc on these I may aswell go back to stock and put the money towards a pair of intake pipes. anyone interested pm me.
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Old 18th August 2019, 08:15 AM   #7 (permalink)
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I run the GFB Mach 2 recirculating BOV's. They are relatively quiet and I noticed a small difference in performance. I also have the trumpets and springs to go atmospheric but have not fitted them, in case it causes an idle issue. I would recommend them highly.
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Old 19th August 2019, 02:11 PM   #8 (permalink)
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I am running GFB Respons TMS and have no issues with them open or recirculating. Idles just fine.Running a MAF-hybrid tune.
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