BOV now available for the Redline!

[sidejam]

Hahn Racecraft Blow Off Valve!!!


For those that were asking about a BOV, Hahn Racecraft now has a solution! I'm wishing my intake didn't go all the way to my turbo!!! I guess if I want it bad enough, I'll just get a different intake and this!

[dipolley]

$450.00 Wow.

[shabby]

What exactly is wrong with the stock blowoff valve that warrants spending $450? I think the $10 spring that dejon sells is more than enough to keep it sealed under pressure.

[Jay_Sin]

This would be a good addition to other mods, but putting this on a stock redline probably wouldn't help much.

[Booster_RL]

I'm not an expert by any means but the entire line of reasoning for that BOV ad seems off to me. Channel more air AWAY from the turbo between shifts? Ermm... the car is a dual scroll turbo part of what makes it a bit of a monster for a 4 banger is the constant flow of air back INTO the compressor. Confused...

As for WHY you would want a 400 dollar BOV----- "whooooooosh" nifty sound effect, albeit a bit expensive.

[boostednlinefor]

booster rl - picture airflow through the intercooler pipes while under throttle. now when you take your foot of the gas, it closes the throttle body plate at the end of these pipes, but the turbine inside the turbo is still spinning from inertia and trying to pump more air into the intercooler pipes. with the throttle body plate closed, where is that air going to go?? without any type of relief, where would that air go?? it would quickly building up in the pipes and head back towards the still spinning turbo. if it does it, the air will slam into the turbine and cause it to stop/slow down suddenly, possibly causing damage. this is where the BOV comes in handy. what hahn is saying is the stock bov does not relieve enough air quickly enough. while it may do the job of preventing harm to the turbo, it may also not do a good enough of job of preventing turbine speed lose from the excess air it wasnt able to take care of. SO: yes, this turbo wants as much air as possible, but going in the right direction and not back through it.

[saab9-3]

i would like to hear a sound clip
and i would also like to know how this affects idle with all your setups including the bypass/open loop, and the recirc setup

the only problem with blow off valves is they mess up the idle usually 9 times out of 10 and the car never really runs the same : \

usually blow off valves are made to form fit the stock setup or a larger turbo setup so anyone with anything in between suffers from poor idle, as an example someone with a CAI or an exhaust mod will have a different idle then what it is meant to give because these "aftermarket blow off valves" are made to spec for stock setups or larger turbo setups : \

i love aftermarket blow off valves and i have come from a few different turbo platforms such as 3000gt vr-4, supra mkIV, wrx, wrx sti, turbo datsun, stealth rt tt, and my friends soarer and rx-7 and i have gone through probably about 8 or 9 different variations myself and have been a part of about 12-15 different blow off valve setups from bypass to recirc setups, and with each blow off valve all of them ran poor idle.

the only one i had luck with was the 3000gt vr-4 with a recirc greddy rs BOV, it still idled weak but was the best luck i had and ran as close to normal as i could get it, however i had to adjust the throttle cable and the idle screw so it never really was stock. I was also burning more fuel at idle to fix the problem due to where i had to setup the idle screw and throttle cable

also that is extremely pricey for a no name blow off valve "no offense on the no name comment"
the block off plate is 45$? it probably costs you about 1.30$ to make the plate and you probably make the block off plate in about 10-15 an hour through a cnc machine shop....

now the good i am really happy you made a blow off valve our platform needs all the support it can get! it is great to see a quality product! however i just thhink your pricing is way too high, i think if you held a group buy for 300$ shipped for the block off plate and full blow off valve system you would have alotta buyers, however at 450$ i don't think we will see many of these on redlines. remember it is only a matter of time before we see HKS, Greddy, RFL, Blitz, Apexi, Tial ,and TurboXS, and others come out with a system for our cars.

[Booster_RL]

Originally Posted by boostednlinefor

SO: yes, this turbo wants as much air as possible, but going in the right direction and not back through it.

Awesome, that was a great technical description and makes some sense now as to why you do not want to "overfeed" with air.

[EcoBoost]

Originally Posted by sidejam

Hahn Racecraft Blow Off Valve!!!


For those that were asking about a BOV, Hahn Racecraft now has a solution! I'm wishing my intake didn't go all the way to my turbo!!! I guess if I want it bad enough, I'll just get a different intake and this!

You can modify your intake tube to fit our new BOV product. It's easy!

[EcoBoost]

Originally Posted by shabby

What exactly is wrong with the stock blowoff valve that warrants spending $450? I think the $10 spring that dejon sells is more than enough to keep it sealed under pressure.

We have found that the problem lies in several areas:

• The stock blowoff valve is undersized to support the mount of airflow needed to be bypassed, especially on cars that have had performance modifications.
• The stock valve is not adjustable to suit different equipment combinations or driving styles.
• The stock valve's flow characteristics are very turbulent, for it discharges at a 90-degree angle to incoming airflow in the turbocharger's compressor inlet. Horrible!
• If course, the stock valve will not work with upgraded turbos, for it is part of the stock turbo.

A stronger spring for the stock valve will not address any of these aspects. Nor is it anywhere near as fun to work with!

[EcoBoost]

Originally Posted by Booster_RL

I'm not an expert by any means but the entire line of reasoning for that BOV ad seems off to me. Channel more air AWAY from the turbo between shifts? Ermm... the car is a dual scroll turbo part of what makes it a bit of a monster for a 4 banger is the constant flow of air back INTO the compressor. Confused...

As for WHY you would want a 400 dollar BOV----- "whooooooosh" nifty sound effect, albeit a bit expensive.

A bit of Blow-Off Valve 101 here (forgive me for starting at the elementary end of the scale if you already know some of this, my intent is to illustrate for all):

The intention of a blow-off, or compressor bypass valve, is to allow the airflow that the turbocharger is creating to have a path for relief during sudden closed throttle events. It is when you close the throttle suddenly under power that the blow-off valve opens to bypass the air that otherwise would 'stall' the turbo up against the closed throttle plate.

If we do not bypass a sufficient amount of air, the turbocharger can be excessively decelerated, causing a 'sag' in power when you re-open the throttle (as in for the next gear). The stock valve has proven itself inadequately sized to flow enough bypass air to keep the turbo sufficiently spoooled.

boostednlinefor's explanation was spot-on too!

[EcoBoost]

Originally Posted by saab9-3

i would like to hear a sound clip
and i would also like to know how this affects idle with all your setups including the bypass/open loop, and the recirc setup

the only problem with blow off valves is they mess up the idle usually 9 times out of 10 and the car never really runs the same : \

usually blow off valves are made to form fit the stock setup or a larger turbo setup so anyone with anything in between suffers from poor idle, as an example someone with a CAI or an exhaust mod will have a different idle then what it is meant to give because these "aftermarket blow off valves" are made to spec for stock setups or larger turbo setups : \

i love aftermarket blow off valves and i have come from a few different turbo platforms such as 3000gt vr-4, supra mkIV, wrx, wrx sti, turbo datsun, stealth rt tt, and my friends soarer and rx-7 and i have gone through probably about 8 or 9 different variations myself and have been a part of about 12-15 different blow off valve setups from bypass to recirc setups, and with each blow off valve all of them ran poor idle.

the only one i had luck with was the 3000gt vr-4 with a recirc greddy rs BOV, it still idled weak but was the best luck i had and ran as close to normal as i could get it, however i had to adjust the throttle cable and the idle screw so it never really was stock. I was also burning more fuel at idle to fix the problem due to where i had to setup the idle screw and throttle cable

also that is extremely pricey for a no name blow off valve "no offense on the no name comment"

No idle problems here!

No offense taken on the 'no-name' comment. Our name, while well-known to many, can't possibly be known to all.

[skyonpsi]

Will this enhance the BSR tune or not? Do you forsee any problems using it in conjunction with the BSR tune?

[saab9-3]

Originally Posted by EcoBoost

No idle problems here!

No offense taken on the 'no-name' comment. Our name, while well-known to many, can't possibly be known to all.

well that defenitally makes me happier it's nice to see quality products custom tailor made for our platform instead of just having a "greddy" that fits and works so/so,

kudos again, just work down your price and you got a buyer

[EcoBoost]

Originally Posted by skyonpsi

Will this enhance the BSR tune or not? Do you forsee any problems using it in conjunction with the BSR tune?

No problems using it with any tune iteration, including BSR-PPC, as it really does not affect tuning parameters.

[TOY4TWO]

besides being a rip off you are screwing up your air/fuel mixture if you pull a ricer move and vent it to the atmosphere. Keep the stock one and $450 on something worth upgrading.

[Bogie]

Originally Posted by EcoBoost

The stock valve has proven itself inadequately sized to flow enough bypass air to keep the turbo sufficiently spoooled.

Borg Warner didn't design the turbo with sufficient bypass capacity to operate within its designed range?

[EcoBoost]

Originally Posted by Bogie

Borg Warner didn't design the turbo with sufficient bypass capacity to operate within its designed range?

It's a compromise. The OEM valve you refer to is particularly small, and poorly conceived in terms of airflow. It gets even more stressed once you turn up the power on the car, which of course also turns up the amount of airflow to be bypassed! Like many items on the car, the bean counters won on this one...it's barely adequate in stock form, and inadequate at anything more than stock power.

[EcoBoost]

Originally Posted by TOY4TWO

besides being a rip off you are screwing up your air/fuel mixture if you pull a ricer move and vent it to the atmosphere. Keep the stock one and $450 on something worth upgrading.

I'd like to point out that this one definitely does not vent to atmosphere...we'd never pull a bonehead move like that!

[blackmod]

I just received it in the mail, looks cool. It's not just the blow off valve itself, it also includes the silicon piping to fit the intercooler pipes. Granted I have a cai and that will have to be amended but not a big deal, I picked up a larger filter head for it anyway (10 inch by 6 inch wide with 4 inch opening) so I knew i was going to change stuff up anyway. I figured this would be a great addition to a custom intake.

I don't mind paying a little more for a product that was engineered and supported instead of copied (this being said the info that comes with it states it is a product from turbosmart, if it is, cheers to you, if not... oops).

I can't put mine on until the end of the month as the stupid car is still getting painted, I will post pictures when I can.

[saab9-3]

Originally Posted by EcoBoost

I'd like to point out that this one definitely does not vent to atmosphere...we'd never pull a bonehead move like that!

thats why there are no idle problems

sounds like a great product just a wee bit on the high side for pricing.