Adjustable ABV

carone · 04-09-2009, 12:41 AM

Does anyone know who makes and adjustable ABV? I'd like to replace the stock 4agze unit with some kind of adjustable one

CpuZapper · 04-09-2009, 02:32 AM

I only knew of one replacement, and it was part of the HKS twin-charging kit. No need to replace it though. It either works or it doesn't. If you don't get boost or don't hit target boost, it needs work/replacement. All it does is allow air past the SC when it shuts off, and prevents overboost, which is very rare. If you install a larger crank pulley, you can perform a vacuum routing change that will raise the overboost release pressure, but it doesn't really give any gain to a stock setup.

328FTW · 04-09-2009, 08:29 AM

Up to stock boost I think the OEM ABV is adjustable just take the sticker off the top and melt the wax out of the centre of the ABV and there should be an allen key bolt you can screw up and down. It won't gain anymore than stock boost levels but can lower the boost<_< which is actually pretty useless really.

There is of coarse the aforementioned rerouting the vacuum lines known as the ABV mod which does help out. Google it and you should turn up what you need. What boost are those mazda chargers capable of anyway? just curious.

carone · 04-09-2009, 10:24 AM

The mazda is capable of putting out 24psi in stock trim. Boost is controlled by the ecm to stay below 14psi.

CpuZapper · 04-09-2009, 12:22 PM

That's a turbo... not a super charger.

carone · 04-09-2009, 01:59 PM

From what I have read about the Mazda twinscrew 24 psi seems very possible. I know that stock untis do run at 14 psi. I still need to compare the crank pulley size of a 4agze to the Millennia. Other then changing pulley I would like to have a way to "tune" boost. Any ideas?

Jackstand Queen · 04-12-2009, 02:11 PM

You don't tune the boost, you tune the EFI to run the boost that occurs with your setup.

Using the OEM sc12, that comes on the 4agze, you won't have the problem of too much boost. Even the larger SC14 (which is in my car), with a aftermarket supplied large main pulley and serious intake mods, the Max boost is 17 PSI.

But then . . . . I suppose I have "tuned my boost" by not installing an oversized main pulley.

Kevin mr2 1985 · 04-15-2009, 12:56 PM

i always thought you could but a mechanical boost controller in a vacuum line before a boost guage and then you could adjust how much boost you have... this will only work with a completely deleted abv. so im going to try that when i have a bigger pullley kit.

Jackstand Queen · 05-16-2009, 09:09 PM

With SC's you recirculate the over-boost pressure with an ABV.

With Turbo's an adjustable blow off valve is a good device and method to regulate boost pressure. For reasons I don't fully understand Blow off valves aren't used on SC's. Though some factory turbos have ABV's instead of blow off valves. That's probably done to prevent the startling noise of a blow off valve.

04-09-2009, 12:41 AM	#1 (permalink)
carone No Skills Join Date: Jan 2009 Posts: 22 Thanks: 1 Thanked 2 Times in 2 Posts iTrader Rating: (0/0% )	Adjustable ABV Does anyone know who makes and adjustable ABV? I'd like to replace the stock 4agze unit with some kind of adjustable one

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04-09-2009, 02:32 AM	#2 (permalink)
CpuZapper RallyRacer Join Date: Mar 2005 Location: Portland, OR Posts: 480 Thanks: 7 Thanked 25 Times in 22 Posts My Google Map iTrader Rating: (1/100% )	I only knew of one replacement, and it was part of the HKS twin-charging kit. No need to replace it though. It either works or it doesn't. If you don't get boost or don't hit target boost, it needs work/replacement. All it does is allow air past the SC when it shuts off, and prevents overboost, which is very rare. If you install a larger crank pulley, you can perform a vacuum routing change that will raise the overboost release pressure, but it doesn't really give any gain to a stock setup.

04-09-2009, 08:29 AM	#3 (permalink)
328FTW Can you say grippy? Join Date: Aug 2008 Location: New Zealand Posts: 1,513 Thanks: 12 Thanked 99 Times in 83 Posts My Google Map iTrader Rating: (0/0% )	Up to stock boost I think the OEM ABV is adjustable just take the sticker off the top and melt the wax out of the centre of the ABV and there should be an allen key bolt you can screw up and down. It won't gain anymore than stock boost levels but can lower the boost<_< which is actually pretty useless really. There is of coarse the aforementioned rerouting the vacuum lines known as the ABV mod which does help out. Google it and you should turn up what you need. What boost are those mazda chargers capable of anyway? just curious.

04-09-2009, 10:24 AM	#4 (permalink)
carone No Skills Join Date: Jan 2009 Posts: 22 Thanks: 1 Thanked 2 Times in 2 Posts iTrader Rating: (0/0% )	The mazda is capable of putting out 24psi in stock trim. Boost is controlled by the ecm to stay below 14psi.

04-09-2009, 12:22 PM	#5 (permalink)
CpuZapper RallyRacer Join Date: Mar 2005 Location: Portland, OR Posts: 480 Thanks: 7 Thanked 25 Times in 22 Posts My Google Map iTrader Rating: (1/100% )	That's a turbo... not a super charger.

04-09-2009, 01:59 PM	#6 (permalink)
carone No Skills Join Date: Jan 2009 Posts: 22 Thanks: 1 Thanked 2 Times in 2 Posts iTrader Rating: (0/0% )	From what I have read about the Mazda twinscrew 24 psi seems very possible. I know that stock untis do run at 14 psi. I still need to compare the crank pulley size of a 4agze to the Millennia. Other then changing pulley I would like to have a way to "tune" boost. Any ideas?

04-12-2009, 02:11 PM	#7 (permalink)
Jackstand Queen Cage Fighter Join Date: May 2008 Posts: 677 Thanks: 52 Thanked 56 Times in 53 Posts iTrader Rating: (1/100% )	You don't tune the boost, you tune the EFI to run the boost that occurs with your setup. Using the OEM sc12, that comes on the 4agze, you won't have the problem of too much boost. Even the larger SC14 (which is in my car), with a aftermarket supplied large main pulley and serious intake mods, the Max boost is 17 PSI. But then . . . . I suppose I have "tuned my boost" by not installing an oversized main pulley.

04-15-2009, 12:56 PM	#8 (permalink)
Kevin mr2 1985 it started! yes! Join Date: Mar 2008 Location: Washington Posts: 424 Thanks: 0 Thanked 2 Times in 2 Posts iTrader Rating: (0/0% )	i always thought you could but a mechanical boost controller in a vacuum line before a boost guage and then you could adjust how much boost you have... this will only work with a completely deleted abv. so im going to try that when i have a bigger pullley kit.

05-16-2009, 09:09 PM	#9 (permalink)
Jackstand Queen Cage Fighter Join Date: May 2008 Posts: 677 Thanks: 52 Thanked 56 Times in 53 Posts iTrader Rating: (1/100% )	With SC's you recirculate the over-boost pressure with an ABV. With Turbo's an adjustable blow off valve is a good device and method to regulate boost pressure. For reasons I don't fully understand Blow off valves aren't used on SC's. Though some factory turbos have ABV's instead of blow off valves. That's probably done to prevent the startling noise of a blow off valve.