alright im bringing car to shop in 3 weeks to have a custom kit done. 2007 z. shop said we would be using 1 bov, mounted on IC piping. every TT kit i have seen has 2 bovs, is this safe? does it matter? should i ask for 2 instead? any disadvantaged or advantages? btw, stock block, looking to get 400+ whp w/ 9 psi. please LMK

thanks

 

hmm y you getting a custom one when you get a gtm turn key kit... Also dude if i was in your position i would be thinking. Well 2 turbos hmm 2bov hmm makes sense to me. Frankly do it right,do it right the first time!

O,also 9psi would get you closer to 500hp, 6.5 or so will give you the lower 400hp. Dude research!

 

I have a Greddy Tuner kit that I just bought.. Im going to run one 50mm Tial until I hit Big boost.

 

I think it mostly depends on how your charge pipes are arranged...like the VQ HRs have 2 BOVs, one for each charge pipe to each throttle body. The VQDEs only have 1 throttle body and i've seen many run only 1 bov. Forged just finished my baby, DE, adnd we are only using 1 bov for 15psi.

 

Wow, all of you need to research.

The 07-08 years have the HR motor with dual intakes/throttle bodies so two BOV's are required. The 03-06 motors hav one TB so one BOV is needed. It has nothing to do with how many turbos you have.

 

lol hey im the one that said 2. lol

 

Beat me to it, while I grabbed a drink! This is correct. It has nothing to do with how many turbos nor how much power. For reference I'm at 25PSI and about 700WHP and I have 1 BOV with my Greddy TT, since it is an 06.

 

Yeah, we posted at the same time so my post does not apply to you.

 

ok cool. but ill have to admit i didnt think about the two TB there 2 bov. I just thought sense 2 turbos=2bov. I guess i learned something kinda new. lol

 

 

30psi here on a single TIAL. (DE motor)

Remember not all BOV are created equal either. Some cannot hold back the pressure (can get bad surging when that happens).

As already stated has to do with how your setup is done. If you are treating the setup as 2 separated setups with no commonality in any of the pressurized side of piping, then you will need 2 BOV's. If you have a common area (i.e. innercooler would most likely be the only area if any), they you could have 1 bov.

tom

 

it looks nice

 

25psi on a Greddy kit?

Post the 700whp dyno, I only know of 3 others that have hit 690+ on Greddy kits....

 

still not sure how can they run that much of boost on those turbos !!!!

 

Past 19-20psi they are only blowing hot air

Im looking at his 14psi numbers and he doesnt seem to be on track to hit near 700whp on his setup....

 

unless you had 2 huge turbos, i'd tell you installer to just use 1 BOV mounted on the intercooler.

you dont win races by dumping boost.

 

Frankly, if you are sitting here asking all of these basic questions about this custom setup and the shop cant answer them then you should probably think twice about having them build your TT kit

 

That was with a single pump and a bad transmission. Pro-EFI (Jason) called me yesterday to let me know that he has it at 25PSI and about 700WHP. It was pooring yesterday, so he didn't drive it to the dyno, but the CAN gauge for the Pro-EFI has an approximate WHP read out that has been proven very accurate. He also has been tuning and racing high HP cars for many years. I will probably hit the track before I worry about a dyno. The trap will give us a more accurate WHP number than a dyno.

Also, for reference, I do have dynos at 693WHP with a bad transmission and a single walbro at 22PSI, but the transmission was slipping so I don't consider the dyno to be reliable. That's why I've only posted my 14PSI info previously.

 

What kind of dyno?

 

Oh, BTW, if 3 others have hit those numbers, then it makes sense that I will as well. You'd be hard pressed to find 3 others with greddy TT that have more into their car.