noahthepilot

Hey everyone! I just put a DIY turbo kit in my 97 Miata. I went with the Voodoo box (I know its crap but I got a good deal) and 305cc supra injectors. Im running a T25 Garret turbo with a custom stainless manifold and downpipe. After putting everything on and turning the car on it sounded great. Everything appeared to work but when I put any load on the car the boost gauge wouldn't move into positive pressure. I hooked the boost gauge to the intake manifold and put a T fitting and split it and ran the other end to the Voodoo Box. I thought it would be a boost leak so I checked my piping and everything was nice and snug. I was wondering if anyone else had a similar problem and figured it out.

18psi

iTrader: (76)

yes

acedeuce802

iTrader: (1)

Get a boost leak checker. Just because your hoses are tight doesn't mean you don't have a leak.

You either have a boost leak, a leak at the boost gauge (still a boost leak), or a junk turbo. Do you know the condition of the turbo?

How's the condition of the engine otherwise? Any issues or maintenance done recently?

Savington

iTrader: (31)

WG isn't closing or you have a boost leak. I'm assuming you've taken the most cursory of diagnostic steps (i.e. "does turbo spin") before posting a thread here.

noahthepilot

I had the turbo looked at by a professional and he said it was good to go. I also rebuilt the engine in the Miata so it has all new internals. Where would I get a boost leak checker?

noahthepilot

I check the WG and yes the turbo does spin lol.

CalebMars

https://www.google.com/#q=boost+leak+checker. I'm a wizard, I know.

sixshooter

iTrader: (12)

Please try to be nicer to the new guy.

I got mine here: Boost leak checker

stefanst

iTrader: (1)

Homedepot high HP turbo accessories:

Oatey 2 in. Gripper Mechanical Plastic Test Plug-33401 - The Home Depot

borka

iTrader: (1)

do you hear the turbo spooling when you floor it? do you feel any power gains in the car?

or it simply doesnt boost and no added power and turbo noises?

noahthepilot

honestly I haven't floored it because I figured out the BOV I bought wasn't working so I took that off and have stopped until I get one. but I did bring it up to around 2000 rpm and didn't really hear anything. I made sure to let the throttle down slowly so that no damage was done to the turbo after I didn't hear the BOV. Once I get I new BOV i'll update the thread and let you guys know whats up. Thank you all so much for your help!

ryansmoneypit

iTrader: (6)

Wait, you only took it to 2 k ? Well that's probably your problem.

borka

iTrader: (1)

Well, you won't get any boost feathering the throttle at 2k, you're not supposed to be in boost until you floor it at 3k rpm.

Be a man, floor it. (As long as tune is decent).

Not saying take it to red line, but floor it from 3 to 4k rpm and you will see if you are making boost.

Your bov might be fine, you will never hear it feathering throttle at 2k.

Stop granny shifting and start double clutching lol

ryansmoneypit

iTrader: (6)

Double clutching? What the hell are you driving, an 18 speed Kenworth?

borka

iTrader: (1)

ryansmoneypit

iTrader: (6)

Hahah, I should have known.!

Chiburbian

iTrader: (1)

Really, really dumb question here but... Did you hook up the vacuum line to the BOV? The right port of the BOV? How you doing the BOV is not working?

4gordeev

Were you actually driving when you brought it up to 2k or just sitting reving in the driveway? You aint gonna build boost with no load...

Wingman703

What does load have to do with anything? The engine is still putting out exhaust gasses and spinning the turbines, load or no load.

4gordeev

Turbo spinning doesn't necessarily mean its making pressure above atmospheric. Your fuel map depends on load and unless you have a hell of an inefficient system reving it in neutral will not flow enough exhaust gasses for it to build any boost. That's why anti-lag systems were invented.