Changing BOV Gains 30HP - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Insert BS here A place to discuss anything you want

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 06-26-2008, 05:43 PM   #1
Elite Member
Thread Starter
iTrader: (6)
 
Join Date: Sep 2007
Location: CA
Posts: 1,990
Total Cats: 9
Default Changing BOV Gains 30HP

kenzo42 is offline   Reply With Quote
Old 06-26-2008, 06:04 PM   #2
Junior Member
iTrader: (2)
 
Join Date: Sep 2007
Location: St. Paul
Posts: 132
Total Cats: 0
Default

The Bosch valves were probably leaking in boost, causing crappy AFR's and/or pushing the turbo out of it's efficiency range. That's right ladies and gents, boost leaks are bad.
xveganxcowboyx is offline   Reply With Quote
Old 06-26-2008, 08:42 PM   #3
Junior Member
iTrader: (1)
 
Join Date: Sep 2006
Posts: 464
Total Cats: 0
Default

Crappy valves are crappy valves. Most OEM DVs are complete garbage. Pretty much any descent aftermarket valve would see those same results, all you guys buying junkyard valves are doing yourselves a disservice. Just stay away from valves that can't in some way be tuned, there is no "one size fits all" sealing mechanism.
PAT! is offline   Reply With Quote
Old 06-27-2008, 12:48 AM   #4
Senior Member
iTrader: (10)
 
Join Date: Feb 2007
Location: South Eastern Wisconsin
Posts: 1,282
Total Cats: 0
Default

When I do get around to buying another bypass valve, it will be a synchronic, but as for all OEM valves being garbage, my 1g DSM valve works perfectly.
ApexOnYou is offline   Reply With Quote
Old 06-27-2008, 01:09 AM   #5
Murderator
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 36,199
Total Cats: 2,584
Default

mmmmmmmmmmmmmmmmmmmmmm twin turbo vette *drool*
18psi is offline   Reply With Quote
Old 06-27-2008, 01:22 AM   #6
Junior Member
iTrader: (1)
 
Join Date: Sep 2006
Posts: 464
Total Cats: 0
Default

Actually I said "most". The problem is making a claim like that is similar to saying that a factory intercooler works perfectly, without trying something better you have nothing to compare it against.

I deal with people all the time that upgrade their OEM valves and have "drive-ability" problems that turn out to be caused by the new valve performing better and maxing out their injectors, MAFs, or fuel pumps.

DSM, Subaru, Mazda, VW, BMW, Toyota...
PAT! is offline   Reply With Quote
Old 06-27-2008, 09:47 AM   #7
Tour de Franzia
iTrader: (6)
 
hustler's Avatar
 
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,114
Total Cats: 351
Default

Quote:
Originally Posted by 18psi View Post
mmmmmmmmmmmmmmmmmmmmmm twin turbo vette *drool*
my daddy had a dual turbo c5z for a couple weeks. It was built just to run 1-liter bikes on the highway. It made something like 980whp on low boost. It was retarded.
hustler is offline   Reply With Quote
Old 06-27-2008, 12:23 PM   #8
Elite Member
iTrader: (12)
 
Join Date: Sep 2007
Location: Charlotte, NC
Posts: 6,868
Total Cats: 66
Default

I bet they just turned the boost up

FM also noticed this on the MSM...and without switching to some BOV whose name sounds like a black womans *****.

http://www.flyinmiata.com/tech/dyno_...boost_leak.pdf
Doppelgänger is offline   Reply With Quote
Old 06-27-2008, 12:26 PM   #9
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,900
Total Cats: 1,792
Default

Synchronic loves to boast on youtube.
Braineack is offline   Reply With Quote
Old 06-27-2008, 01:52 PM   #10
Tour de Franzia
iTrader: (6)
 
hustler's Avatar
 
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,114
Total Cats: 351
Default

I don't understand how adding a blow off valve can change output unless the wastegate is closed and the turbo is never spooled. If the BOV is bleeding off boost, the pressure will be compensated with the wastegate.

Oh, and that synchronic **** is ******* stupid. If it weren't so expensive then maybe I'd buy one...but this **** is retarded. Give me the one which lasts the longest v.forge
hustler is offline   Reply With Quote
Old 06-27-2008, 02:18 PM   #11
Junior Member
iTrader: (1)
 
Join Date: Sep 2006
Posts: 464
Total Cats: 0
Default

A leaking valve can put the turbo into a different part of the efficiency island, that's one way. That alone can effect power just by higher intake air temps. Those same temps can lead to timing retard, again less power. Spool will be slower, so everything below when peak boost is reached will be lower.

This can be very minor or it can be pretty significant, the turbo is drawing in more air to reach the same boost pressure so the bottleneck of the pre-turbo intake system becomes greater. And, this is a long shot, if recirculated back into the turbo intlet pipe, all that expanding air from the valve can create turbulence or cavitation or some otherwise undesirable phenomena which can lead to less power by interrupting the passage of air into the turbo.
PAT! is offline   Reply With Quote
Old 06-27-2008, 03:33 PM   #12
Senior Member
iTrader: (10)
 
Join Date: Feb 2007
Location: South Eastern Wisconsin
Posts: 1,282
Total Cats: 0
Default

Quote:
Originally Posted by PAT! View Post
Actually I said "most". The problem is making a claim like that is similar to saying that a factory intercooler works perfectly, without trying something better you have nothing to compare it against.

I deal with people all the time that upgrade their OEM valves and have "drive-ability" problems that turn out to be caused by the new valve performing better and maxing out their injectors, MAFs, or fuel pumps.

DSM, Subaru, Mazda, VW, BMW, Toyota...
Yeah I suppose. I have two 2g valves sitting in a box, one was so weak I could push it open with ease, the other was okay enough to use for a few thousand miles last year, so I guess it depends.
ApexOnYou is offline   Reply With Quote
Old 06-27-2008, 03:44 PM   #13
Elite Member
iTrader: (14)
 
Join Date: Mar 2006
Location: Edmonton, AB
Posts: 4,921
Total Cats: 0
Default

If they want to prove their claim, do a dyno run with out a BOV. The same gain should be achieved.
jayc72 is offline   Reply With Quote
Old 06-27-2008, 05:58 PM   #14
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,900
Total Cats: 1,792
Default

Quote:
Originally Posted by jayc72 View Post
If they want to prove their claim, do a dyno run with out a BOV. The same gain should be achieved.

yep. the gain wasnt from a BOV, the gain was from fixing a leak.
Braineack is offline   Reply With Quote
Old 06-27-2008, 06:24 PM   #15
Murderator
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 36,199
Total Cats: 2,584
Default

bullshitin sob's...........reminds me of some of the ebay ************* claiming "10-20hp gain" from their knock off bov's lol
18psi is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
MP62 maintenance Pist0n Supercharger Discussion 3 10-10-2015 05:23 PM
Back to Stock Part Out!! Turbo Parts, MS2 Enhanced 01-05, Suspension, and MOAR! StratoBlue1109 Miata parts for sale/trade 16 10-02-2015 10:39 AM
Bad head gasket or ? shooterschmidty Engine Performance 8 09-30-2015 11:28 PM
why is my car running like pewp? (tune/datalog) itsMikey MSPNP 3 09-28-2015 07:40 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 12:10 PM.