How bad is it to boost without BOV ?
 

Hi everybody,
I built a really cheap turbo setup on my miata because I got the car for really cheap and just wanned to have a little bit more fun with it.

It,s no my first turbo setup but my first without BOV, I was wondering how bad it was on the turbo?
I took a turbo from a saab 9-5 and running about 8psi. I know surging is not good but I,ve seen turbo setup without BOV before so is there anyone that already tried it?

Thanks!

Why not spend $20 and not have to worry about it? Compression surge is bad.

I will install one, but for now I wanna make it run to see if everything works fine, and it,s not for the 20$ BOV but more for the piping to be weld to add a flange for it

I wont do much mileage on the car, its not a dayly drive and there is a bunch of used turbo for my setup for 50$ close to my place

BOV? Just run a flapper with a choke cable. Everytime you lift off the gas, just pull it.

Helpful

Yeah I am real helpful. Nice negative props. None of which came from me.
If you want serious answers ask serious questions.
Run no bov on turbo? I'd say it's fine as long as you don't run more than 3 psi.

[QUOTE=thirdgen;1181092]
Run no bov on turbo? I'd say it's fine as long as you don't run more than 3 psi.

This is the kind of info that interests me. Thanks for that. My thread was not about if it is good or not to run without blow off valve. As I explained, i am temporarly running without one and was just asking how bad that could be.

I dont know why people like to bash so much, If you dont want to answer, just dont, you dont HAVE to.

Thanks for understanding

Nothing in your original post mentioned that this was temporary...

You can probably source an OEM recirculation valve of some sort and use it without needing to resort to welding/etc.

300ZX twin turbos have great ones. Maybe even one off you old Saab?

It would still require some kind of welding, as you have to add it to the charge pipe.

OP, if welding makes things too difficult, get a BOV of this style:

https://www.miataturbo.net/attachmen...ine=1415261665

I am more afraid of what he is using for fuel and spark control then not having a bov. If spending $50 on an eBay bov then a MS and wideband has got to be way to expensive.

no excuse: Type RS Red Turbo Charger BOV Blow Off Valve 2 5"Aluminum Flange Adapter Pipe | eBay


but no, your car won't burn up in vodka fire if you run without one. But there's no reason you can't just do it all right the first time.

because idiots like you need to be kept in check, otherwise you keep making more and more stupid threads and making the forum a dumber place.

we're attempting to prevent the onset of idiocracy

I will try to find a used wideband in the classified. I retarded my ignition timing to 4 deg instead of 10deg. Is there anything else suggested for timing? From what I understand the ignition box are useful only for the earlier generations of miata, am I right? (Because the 90-93 has the cam angle sensor)
Thanks

Ideally you don't want to pull any timing until you start getting into boost. The more boost through the RPMs, the more timing should be pulled. It's not as simple/linear as retarding the timing 6 degrees at all times.

By retarding your ignition to 4 degrees, you are preventing knock at peak power, but you sacrifice power everywhere else. Get a standalone, control your timing, stop being a noob, and stop posting.

Can we get pics of your setup? Interested to see what a turbo setup on stock ECU with no timing control at all and no BOV looks like.

In for pics of PVC charge piping.

:laugh: my son is MASTERING that thing right now :laugh:

Yes I will this weekend, no access to a computer for now

Yeah sorry you're right, forgot to mention lol but yeah I might go back to the scrapyard to pick the stock one of the saab and see if its an easy fit. Otherwise I'll change one aluminium elbow on my piping for a steel one and weld a flange on it

I think this thread can be deleted,
Thank you!

FTFY

I've run 60psi without a BOV.....

.......of course that was on a diesel. :)

I spoke with Tial and asked if one 50mm BOV was sufficient for the turbo setup i was working on (twin 3582rs on an lsx) and they told me that if its a 5 speed car being used for drag or street applications i really dont even need one at all, we did end up using 2 50mms just in case though. I have put together non intercooled mustang turbo kits with no BOV and no issues but not with a t25 with no antisurge, nissan put a BOV on the stock s13s but its hard to say if that was to prevent noise or to extend turbo life, or maybe both.

Interesting, thanks for your reply! I will run it like that for now, i'm sure a BOV can extend the turbo's life too but i'm running 8psi on a 500$ setup on a 700$ car with 312000km so the engine might go before the turbo anyway haha