Hey noob here.....need some info on these great cars

[3rdGenLuvr]

Why is a BOV a worthwhile mod? just curious.

Altho a turbotimer is a great mod, if ur a disciplined type person and let it cool down a few minutes before shutting down (esp after a hard run) you really dont need it. If ur lazy, definitely get one!

[fortyoz2eric]

aside from the obvious fact that the sound of BOVs instantly give me throbbing boners, they also relieve pressure while the throttle is closed (during shifts). this can save your engine when your running too much boost

[RX7_4_Eva]

When you let go of the gas at high revs or shift, your turbos are still at high revs but your engine is not. This creates a high amount of boost pressure that shoots back down to your turbos from your engine. This causes the turbos to stop suddenly. You can damage your turbos from the sudden stoppage and they take a while to spool back up again. With a BOV, that excess pressure is bypassed into the atmosphere, activated by pressure. It will have dramatic effects on your turbo and engine life, plus mid-range turbo lag is eliminated.

[3rdGenLuvr]

Aside from that sound, doesnt the car have a stock bov? Keep teaching me guys!

[fortyoz2eric]

i'm half talking out of my ass here but i highly doubt they come with one (actually there would be 2 if any). i'm assuming they come with an internal wastegate though which regulates the boost pressure so you don't have to worry about damaging the turbo or the engine. has any car ever come with a BOV?

[EfiniRX7]

Yeah 3rd gens definately come with a stock BOV. It's a Nippon Denso unit and is actually a really good quality unit. Easily as good as most of those aftermarket ones, but just not as flashy. It's hooked up to your airbox on the left side...it's one of two smaller hoses...the lower one. It's a brownish looking thing just off of the airbox. It looks like...ummm...not sure It's like a little toy looking plastic thingy. You can unattach it from the box and it sounds just fine, but make sure to close up the hole in the airbox so dirt doesn't get in there. It's set up that way so that the purged air is routed back into the intake, but it's so little that it's negligable.:flash:

[EfiniRX7]

A lot of the older single turbo cars like the RX7 TIIs, DSM's, Mitsu Starions, Celica All Tracs, MR2s, and whatnot usually don't come with a BOV simply due to cost and that they're not running much boost to take much advantage of it. I could be wrong about some of those cars though. Due to the rather complex system of the 3rd gen RX7's they of course have a wastegate...all turbos do, but it also has what is called a Pre-Control which is part of the sequential system. This essentially bleeds off some boost to the 2nd turbo so it's already spinning good when it comes online. Toyota has a different sequential system on the Supra though that uses stepper motors I believe. It does the same thing, but mechanically.

[fortyoz2eric]

oh wow, i feel dumb. so how loud is the thing? i've heard fd rx7s before that didn't seem to have a BOV...or maybe they were running at such low boost the BOV wasn't doing anything

[EfiniRX7]

It's all good They're nearly impossible to hear in stock form since it just blows back into the airbox and it's kinda hidden down below some other hoses. I had no idea what it was or where it was for the longest time either Once it's disconnected from the airbox it's nearly as loud as most aftermarket ones, but it really wasn't designed for volume. It's pretty ugly too since it's brown and shaped like a McDonald's Happy Meal toy

[fortyoz2eric]

hahaha