Mazda Rotary Club

Cars by Model Type => 3rd generation RX-7's => Topic started by: Morrmat on February 05, 2007, 08:36:44 PM

Title: Whats the loudest?
Post by: Morrmat on February 05, 2007, 08:36:44 PM
BOV?

i\'m looking at getting a NurSpec exhaust system for my 92fd efini type r and was curious as to peoples opinions on BOV\'s??

do you reccomend one? If so which one and for what reasons?

Many thanks,

Matt
Title: Whats the loudest?
Post by: LRP on February 05, 2007, 09:47:24 PM
what ever you do dont get a cheap one of ebay they leak of and cant hold the boost!!!! im running a bailey that did the job with the twins and was loud but i dont need it as im going single and going to chance no bov!!
Title: Whats the loudest?
Post by: Morrmat on February 05, 2007, 09:52:35 PM
i dont suppose you\'ve got any video clips have you LRP? are you selling your bailey BOV?
Title: Whats the loudest?
Post by: prince_of_tokyo on February 05, 2007, 11:39:44 PM
i had a blitz and it was brilliant...nice sound...holds the boost perfect
Title: Whats the loudest?
Post by: McCARTHY on February 06, 2007, 04:25:24 PM
Greddy or SARD racing versions they don\'t leak at all both top units
Title: Whats the loudest?
Post by: nikp on February 06, 2007, 05:02:40 PM
Hey - LRP, want to sell your BOV then? If so, how much? :D :p
Title: Whats the loudest?
Post by: Morrmat on February 06, 2007, 06:24:26 PM
Quote from: nikpHey - LRP, want to sell your BOV then? If so, how much? :D :p

you thief! i have 1st dibs! :Tongue1
Title: Whats the loudest?
Post by: prince_of_tokyo on February 06, 2007, 10:22:06 PM
Quote from: McCARTHYGreddy or SARD racing versions they don\'t leak at all both top units

what do sard blow off valves sound like??? never come across one b4??? what can they be compared to???
Title: Whats the loudest?
Post by: strickerz on February 06, 2007, 11:00:18 PM
I\'ve not heard one Myself but the Zx boys seem to Reckon that Turbo XS are the way to go....
Title: Whats the loudest?
Post by: prince_of_tokyo on February 06, 2007, 11:17:40 PM
Quote from: strickerzI\'ve not heard one Myself but the Zx boys seem to Reckon that Turbo XS are the way to go....

my m8 had a turbo x-s on his scooby, was LOUD...sounded like a amplified version of a bailey dump valve
Title: Whats the loudest?
Post by: FLAT4MATT on February 07, 2007, 12:44:50 AM
I had a Greddy Type R BOV and a Greddy Relief Valve when I had the twins and that was nice and loud...
Title: Whats the loudest?
Post by: Freddy on February 07, 2007, 12:49:18 AM
Blitz sounds good, not the loudest thou.
Title: Whats the loudest?
Post by: craigr on February 07, 2007, 09:03:57 AM
I\'ve used Blitz, HKS and Bailey in the past, all three are good and reliable, all have handled boost fine. In terms of sound, I think the Blitz sounds \'nicest\', but not necessarily loudest. HKS can be tuned with a replacement valve to make it sound different (I did change mine, but must profess to not noticing much difference).

I too am going single, so am removing the Blitz valve (and the Blitz Nur Spec R exhaust for that matter). Will be posted in For Sale soon.

Cheers, Craig
Title: Whats the loudest?
Post by: Morrmat on February 07, 2007, 06:45:45 PM
Quote from: craigrI\'ve used Blitz, HKS and Bailey in the past, all three are good and reliable, all have handled boost fine. In terms of sound, I think the Blitz sounds \'nicest\', but not necessarily loudest. HKS can be tuned with a replacement valve to make it sound different (I did change mine, but must profess to not noticing much difference).

I too am going single, so am removing the Blitz valve (and the Blitz Nur Spec R exhaust for that matter). Will be posted in For Sale soon.

Cheers, Craig

you seem to have the set-up that i want!

can i have 1st dibs when you do decide to sell?
Title: Whats the loudest?
Post by: anthony on February 08, 2007, 06:03:30 PM
im also interested in a bov as well:

will this blitz one fit without problem
http://cgi.ebay.co.uk/Blitz-SS-Blow-off-dump-VALVE-BOV-FIT-ANY-TURBO-CAR_W0QQitemZ300078318405QQihZ020QQcategoryZ72205QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
and is this the one you guys are saying sounds the nicest ? :)
As £39 with free pnp sounds pritty good
Title: Whats the loudest?
Post by: strange_days_uk on February 08, 2007, 06:18:15 PM
if it is a proper Blitz that is a good price

you will still need a fitting kit though
Title: Whats the loudest?
Post by: anthony on February 08, 2007, 06:22:15 PM
Quote from: strange_days_ukif it is a proper Blitz that is a good price

you will still need a fitting kit though

where could i get one of those? then id buy the both..
or is there somewhere that will offer a deal on the two?
Title: Whats the loudest?
Post by: strange_days_uk on February 08, 2007, 06:33:50 PM
Looking more closely that is not a genuine Blitz bov here be the proper one

http://cgi.ebay.co.uk/RX7-BLITZ-SS-BLOW-OFF-VALVE_W0QQitemZ300078757203QQihZ020QQcategoryZ72205QQssPageNameZWDVWQQrdZ1QQcmdZViewItem?hash=item300078757203

he has welded the fitting kit flange to a bigger bit of ali, but essentially the fitting kit is a 19mm flange that connects to the silicone hose in place of the stock bov

the proper ones are considerably more pricey

http://www.blitz-uk.co.uk/ProductItem-350.aspx
Title: Whats the loudest?
Post by: strange_days_uk on February 08, 2007, 06:36:26 PM
Lots of kits at RHD https://www.rhdjapan.com/home/products/products.php?int_category_relation_id=1386&int_catalogue_id=427&page=1&nextpage=0

I have the Graddy type RS https://www.rhdjapan.com/home/products/product_detail.php?int_product_id=897 which make the nice chirrupy noise
Title: Whats the loudest?
Post by: 20B_boy on February 08, 2007, 07:17:11 PM
EDIT: What Simon said
Title: Whats the loudest?
Post by: anthony on February 08, 2007, 07:47:02 PM
Quote from: strange_days_ukLooking more closely that is not a genuine Blitz bov here be the proper one

http://cgi.ebay.co.uk/RX7-BLITZ-SS-BLOW-OFF-VALVE_W0QQitemZ300078757203QQihZ020QQcategoryZ72205QQssPageNameZWDVWQQrdZ1QQcmdZViewItem?hash=item300078757203

he has welded the fitting kit flange to a bigger bit of ali, but essentially the fitting kit is a 19mm flange that connects to the silicone hose in place of the stock bov

the proper ones are considerably more pricey

http://www.blitz-uk.co.uk/ProductItem-350.aspx


so that should just bolt straight on right? as the fitting kit is already on there..
 i think ill just buy that then ?
Title: Whats the loudest?
Post by: richard cash on February 08, 2007, 09:32:46 PM
i have a type R and type S greddy one for sale if your interested.:)
Title: Whats the loudest?
Post by: Morrmat on February 08, 2007, 10:01:35 PM
I\'m now even more undecided! lol!

Not sure whether to get a bov or a wastegate? I love the fluttering noise a wastegate makes!!

Can anyone suggest what would be the best for the car?
Title: Whats the loudest?
Post by: strange_days_uk on February 09, 2007, 08:04:56 AM
Quote from: MorrmatI\'m now even more undecided! lol!

Not sure whether to get a bov or a wastegate? I love the fluttering noise a wastegate makes!!

Can anyone suggest what would be the best for the car?

You already have an internal wastegate setup on the twins.  The wastegate is an integral part of any turbocharged application, bleeding off any excess boost pressure.  You can put a boost controller inline to it, to adjust boost levels.

The BOV is a different thing entirely, when you come off the throttle the pressured air has nowehere to go so the bov opens to release the charge.  If this didn\'t happen you would experience compressor surge and potentially damage the turbine.

You want a bov, a wastegate doesn\'t make any real noise unless venting to a screamer pipe.
Title: Whats the loudest?
Post by: Morrmat on February 09, 2007, 05:32:09 PM
Quote from: strange_days_ukYou already have an internal wastegate setup on the twins.  The wastegate is an integral part of any turbocharged application, bleeding off any excess boost pressure.  You can put a boost controller inline to it, to adjust boost levels.

The BOV is a different thing entirely, when you come off the throttle the pressured air has nowehere to go so the bov opens to release the charge.  If this didn\'t happen you would experience compressor surge and potentially damage the turbine.

You want a bov, a wastegate doesn\'t make any real noise unless venting to a screamer pipe.

thanks for claryfying that mate, im still learning! only had the car for 2 months!
this forum is full of useful information, gotta be one of the best forums im a member of.

Matt
Title: Whats the loudest?
Post by: strange_days_uk on February 09, 2007, 05:37:28 PM
Pleasure, I learnt all that I know from here too
Title: Whats the loudest?
Post by: Adie Moore on February 09, 2007, 06:02:00 PM
i thought the wastegate divirted exhaust gas away from the turbo, thus controlling boost. not venting the pressure inself
Title: Whats the loudest?
Post by: strange_days_uk on February 09, 2007, 06:15:20 PM
Yes.  Once you reach set boost the wastegate is open fully, which as you say diverts any more exhaust gas away from the tub so the tub doesn\'t spool any further.

I didn\'t word my reply well enough obviously
Title: Whats the loudest?
Post by: FLAT4MATT on February 09, 2007, 06:57:35 PM
Quote from: strange_days_ukYou already have an internal wastegate setup on the twins.  The wastegate is an integral part of any turbocharged application, bleeding off any excess boost pressure.  You can put a boost controller inline to it, to adjust boost levels.

The BOV is a different thing entirely, when you come off the throttle the pressured air has nowehere to go so the bov opens to release the charge.  If this didn\'t happen you would experience compressor surge and potentially damage the turbine.

You want a bov, a wastegate doesn\'t make any real noise unless venting to a screamer pipe.

That should probably read the STOCK wastegate doesn\'t make much noise, i\'m not running a BOV on my single, just the HKS wastegate which is fed back to the downpipe. Makes a hell of a chattery racket, maybe even louder than the BOV was...

Screamer pipes, well they ARE loud!
Title: Whats the loudest?
Post by: strange_days_uk on February 09, 2007, 07:07:10 PM
I have an HKS style wastegate (cheap ebay copy jobbie).  It is plumbed back into the downpipe.  I don\'t notice any noise to be honest.  But then I\'m too busy listening to the turbo !!   :D
Title: Whats the loudest?
Post by: Spotlamp on February 09, 2007, 07:43:05 PM
I\'ve got a nice Blitz BOV that\'s up for sale on eBay at the mo.  It comes with all bits to fit directly into a twin turbo FD, including brackets and pipe work.

If anyone\'s interested take a look.

Cheers
H

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=260085285197
Title: Whats the loudest?
Post by: anthony on February 10, 2007, 07:38:27 PM
im interested, ive sent you at message on ebay.

cheers

ant

Quote from: SpotlampI\'ve got a nice Blitz BOV that\'s up for sale on eBay at the mo.  It comes with all bits to fit directly into a twin turbo FD, including brackets and pipe work.

If anyone\'s interested take a look.

Cheers
H

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=260085285197