What size BOV and Wastegate?
Thread Starter
Teching In
Joined: Jun 2014
Posts: 39
Likes: 1
From: ATCO NJ
What size BOV and Wastegate? I'm trying to find out what size BOV and Wastegate I should pick up. I have a stock 5.3l LM7 and a Master Power T70 turbo. Plan on running 8-12 lbs boost (think 8 will be plenty for me). I haven't been able to find consistent info on what size bov/wastegate (seen anywhere from 38-50mm). Any help nailing it down would help, Thanks!
Also, Im putting this together on a budget and am new to turbos, what brands of BOVs and Wastegates should I be looking at? I don't think I can swing NEW Tial or other high end stuff but if I could get a used one would that be better then new stuff about the same price? again any help is greatly appreciated!
Also, Im putting this together on a budget and am new to turbos, what brands of BOVs and Wastegates should I be looking at? I don't think I can swing NEW Tial or other high end stuff but if I could get a used one would that be better then new stuff about the same price? again any help is greatly appreciated!
Thread Starter
Teching In
Joined: Jun 2014
Posts: 39
Likes: 1
From: ATCO NJ
I'm trying to find out what size BOV and Wastegate I should pick up. I have a stock 5.3l LM7 and a Master Power T70 turbo. Plan on running 8-12 lbs boost (think 8 will be plenty for me). I haven't been able to find consistent info on what size bov/wastegate (seen anywhere from 38-50mm). Any help nailing it down would help, Thanks!
Also, Im putting this together on a budget and am new to turbos, what brands of BOVs and Wastegates should I be looking at? I don't think I can swing NEW Tial or other high end stuff but if I could get a used one would that be better then new stuff about the same price? again any help is greatly appreciated!
Also, Im putting this together on a budget and am new to turbos, what brands of BOVs and Wastegates should I be looking at? I don't think I can swing NEW Tial or other high end stuff but if I could get a used one would that be better then new stuff about the same price? again any help is greatly appreciated!
Also is there any disadvantage to running a BOV or wastegate that is on the bigger side??? Or can they ever be too big??? Thread Starter
Teching In
Joined: Jun 2014
Posts: 39
Likes: 1
From: ATCO NJ
Thanks! I really appreciate the advice! If you don't mind me asking, is there a math formula or something that is used to come up with those sizes? Or are they from seeing other builds and or personal experience? I'm trying to learn as much as I can about turbo cars and even tho knowing what to use on this build will get me threw it, I still would like to learn how to size it for other apps. Thanks again for the advice LS1NOVA!
Thanks! I really appreciate the advice! If you don't mind me asking, is there a math formula or something that is used to come up with those sizes? Or are they from seeing other builds and or personal experience? I'm trying to learn as much as I can about turbo cars and even tho knowing what to use on this build will get me threw it, I still would like to learn how to size it for other apps. Thanks again for the advice LS1NOVA!
BOV, you want it to relieve essentially as much as possible to prevent compressor surge. 50mm is pretty standard these days.
There are flow data calculations to size turbos or you can call a reputable turbo sponsor and tell them your combo, they will size it accordingly.
I went with two eBay emusa 38s and less than a year I am starting to see rust on the valve face. They still function, but this is not confidance inspiring. I worry now about them sticking and over boosting. Should have gone tial or jgs, but I was trying to save a buck, lol.
I went with two eBay emusa 38s and less than a year I am starting to see rust on the valve face. They still function, but this is not confidance inspiring. I worry now about them sticking and over boosting. Should have gone tial or jgs, but I was trying to save a buck, lol.
Trending Topics
Oh I have a bunch of other little parts that are Chinese like my intercooler that are working great. Just would probably avoid it on the wastegate next time. Good part is I am only out $100 vs the $500 I would have had in tial units.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo Ive had lots of luck with the china intercoolers too, just one of those things. Having a wastegate stick shut and melt a motor down wouldn't be on my priority list hah.
Thread Starter
Teching In
Joined: Jun 2014
Posts: 39
Likes: 1
From: ATCO NJ
Thanks guys for the replys, it's very much appreciated! All of this info is helping clear up alot of the confusion. As much as I'm trying to keep a build on a budget (it's supper easy to get carried away LoL), but I don't want to risk every thing just to save a few bucks. Some times it's just a better investment that way. As I was kind of assuming, I will avoid knock off bov and wastegates and try and get some quality parts. Thanks again guys
Oh I don't know, have known a ton of people using knock off BOV's and never heard of issues other than finding a replacement flange. I mean there are people out there that actually advocate not using a BOV at all. I know that Cosworth was not running one at all. Not sure if that is still true, but worst case your $40 BOV fails and you hear some funny noises from the turbo for a bit. You could honestly buy 3-4 ebay wastegates for the price of one new Tial. That being said, I got a used Tial 50mm for $75 online
Yea you guys are lucky(atleast I think), our season is pretty small up here and the last thing I want is knock off part holding me back.
Ive had lots of luck with the china intercoolers too, just one of those things. Having a wastegate stick shut and melt a motor down wouldn't be on my priority list hah.
Ive had lots of luck with the china intercoolers too, just one of those things. Having a wastegate stick shut and melt a motor down wouldn't be on my priority list hah.
But yeah, my frozen boost A2W intercooler has been a champ and seems pretty well made thus far. Several freinds rocking various ebay BOV's, a number using intercooler piping kits, I use a bunch of t-bolt clamps and silicone parts from ebay.
V-band clamps are another thing not to cheap out on. Dealing with that now too....hmm seems anything exhaust related except maybe a muffler may be better to get made in USA as it has to deal with some punishment in a turbo car. I know for a FACT that flex joints better be well made or they are going to have a high speed come apart through your turbo! Have not had it happen to me, but have seen the after effects first hand!
Thread Starter
Teching In
Joined: Jun 2014
Posts: 39
Likes: 1
From: ATCO NJ
Oh I don't know, have known a ton of people using knock off BOV's and never heard of issues other than finding a replacement flange. I mean there are people out there that actually advocate not using a BOV at all. I know that Cosworth was not running one at all. Not sure if that is still true, but worst case your $40 BOV fails and you hear some funny noises from the turbo for a bit. You could honestly buy 3-4 ebay wastegates for the price of one new Tial. That being said, I got a used Tial 50mm for $75 online
Thread Starter
Teching In
Joined: Jun 2014
Posts: 39
Likes: 1
From: ATCO NJ
Nah, the local track opens later than a lot of places up north and closes earlier a lot of times. There are others further south that open early, but right now I don't have a trailer, so I am left driving to the track. I would much rather drive my junk 30 miles than 2-3 hours through Atlanta traffic!
Man I live 5 mins from one of the busiest tracks in the USA. I don't remember when there opening day was but they are scheduled to be open till mid December i think! Weather permitting they are open at least 4 days a week not including private track rentals. Killing me not having something together worth running
Yeah it can cause compressor surge which basically stalls the wheel while exhaust gas is still pushing on it. I run one, but what I am saying is that worst case if it goes out it will not be instant death to the motor like if a wastegate freezes up and causes and overboost condition.
