Need advice about what to do
 

I put this post in my dyno thread, but I need responses by Sat.

Well, it was sort of a sad day today. Nothing broke so that's why I say sort of. I just came back from vacation and decided to really drive my car a see how it felt. I noticed that my boost gauge was going to 17 psi. I'm only making 212 hp at 17 psi ???? That seems kinda shitty. It seems to spool ok, so I can't imagine that the cat is clogged. The diaphragm in the wastegate isn't holding at max boost, but it still manages to get to 17 psi on gauge.

Any ideas on what could be wrong, or is this just the turbo that I'm running?

I've read here that the stock internals are less dependent on boost than hp numbers when it comes to breaking things. I'm tracking my car this Sat. Should I tone down the boost, or run it the way it is.

Come on hustler, 212hp at 17psi :hustler:

Sounds like tuning issues to me but it's pretty hard to say what's causing your lack of HP. I'd be down with helping you figure it out one evening this week if you want...never messed with link before but I a close by and an extra set of hands never hurt (plus it's been about 7 months since I've layed eyes on my Miata unfortunately)

a good thing to know is the size of the turbo

10 psi on a gt2554 :ne: 10 psi on gt3071


Also what size exhaust are you running?

Friday evening might work for me. My inlaws are in town and I'm not sure if they are leaving Friday morning or Sat. I should probably do a compression check just to make sure that it's not something obvious. Maybe I have a cylinder that's down. Any suggestions?

I believe the turbo is a non ball bearing 2560 since it's an old FM2 kit

If you are cranking 17psi on a 2560 you can blow your engine. I know one guy that did.

whatever you do, don't tell us which turbo you're running.

What are you intake temps like at extended boost runs at 17psi?

ding ok

Fail

Yeah man what pressure is your WG setup for initialy?
Have you confirmed your gauge is correct (they can get out of whack)?
Is your clutch sliping?
Is your timming stupid low?
Are your AIT's stupid high?
Are you stupid rich on fuel?

All this shit will cause the above. Also a weak spark could contribute. get back to us with some more info and we will be able to help you more.

what is your favorite part of anime? the "art" or the celibacy?

i love the art the celibacy just kinda ended up happening on its own :P

I'm starting to feel a little better now. I called FM and sent them a pic, which I'll include shortly in this post. Brandon said it looks like a modified Tec turbo (T25) It is supposed to be good for 200 rwhp and peak efficiency is around 10-12 psi.

Looks like my FM2 kit has been modified at some point. I'm probably going to back the boost off. Today it was only hitting 16psi, so my 17psi stated earlier appears to be incorrect. What are your opinions????

Pics of turbo
 

FM says garrett turbo modified by tec

https://www.miataturbo.net/forum/mem...ms/100/381.jpg

https://www.miataturbo.net/forum/mem...ms/100/380.jpg

What do you think?

So your turbo is more than likely an equivalent of a 2554. On a 1.6 at 15 psi I wouldn't expect much more than 200 whp. if your running 17 psi I'd turn it down before you kill the turbo and/or your motor. What are your ait's like? Were going to need more infoz to be able to help you.
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Methinks there are no pictures there.

That's about equivalent to my turbo...I wouldn't make much power at 15-17psi either.

15psi from 2554 on a 1.8 makes 230hp.

is that hole on the manifold for the EGT sensor just chillin' open like that?

yes, it's just open like that. Showing just how much of a newb I am. It came like that, and I didn't realize something was supposed to go there.

I may start looking ror a new turbo, any suggestions? The wastegate actuator diaphram is bad anyway (Although replacable, a new turbo would give me more power.)

What EGT sensor do you recommend? There is a hookup on the link to run this sensor

i bet if you plug the hole, with anything, even some bubblegum, you'll get a lot of lost power back.

plug the egr port and jump on the china charger wagon.
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Quick, someone find me a rock so that I can crawl under it. :facepalm:

levnubin: Where did you purchase your chinacharger?

Holy shit, at least most of it was a simple fix.

I can't see the pictures here at work, so I get to laugh again(harder) when I get home.

Good luck getting the most out of it djp.

ebay
http://cgi.ebay.com/ebaymotors/ws/eB...5015&viewitem=

There aren't any pics, at least none that I can see.
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his pics are hosted through this site, you should be able to see it....

https://www.miataturbo.net/forum/mem...ms/100/380.jpg

ok i figured it out, djp the n00b had his album set to private.

Oh...yeah...there's a hole in the top of the manifold!

Most of use complain when we get flange interface leaks at the flange right after that hole...you've got a ~1/4" leak there. From what I've read, air pressure is between 20-30 psi there, so that's like having a missing valve stem. I imagine a lot of air comes out of there fast, and could surely be robbing you of 30-50hp.

Not to pile on but didn't that massive exhaust leak coming from that hole clue you, they dyno guys, your friends, etc. that something wasn't right? Even with that, seeing 17psi it's likely effecting spool up more than top end. Pretty obvious you've moved outside the efficiency range of that turbo. Diminishing returns doing that.

Have you run a bolt into that opening yet? Curious what difference you might get out of that.

oh my fucking god. Please tell me you're not pro-creating. Please.



if you have even a tiny DP leak at the turbo power will fall off significantly.

Pro creation already acomplished. World, get ready for a wild ride.

https://www.miataturbo.net/forum/mem...ms/100/382.jpg

quick fix at lunch

notice a difference?

Haven't driven it yet. Will know tonight on drive home.

This is what I don't understand. I would expect to hear an obvious and massive hissing when the car was on the dyno, but I didn't. I would expect to hear something even when the car is idling, I didn't. That pisses me off because I just had the car tuned ($300). I'll see what differnece it makes in the butt test before I pull the boost down from 16psi.

did the port go all the way through? don't see any signs of exhaust coming from it. be careful of over boost if so.

It didn't look like it went straight through, but I couldn't confirm that it was blocked off. LAter tonight I'll take the bolt out and try sticking some wire through there to see if there really was exhaust leaking through

I doubt it went all the way though, seems like you would know if it did. I would think a leak like that would make plenty of noise and the entire enginebay would be black.

Noise and the constant smell of exhaust in the car would have been tip offs.

Seems pretty clear that the hole doesn't go all the way though since I never experienced any of the above problems. I think in the next couple of months I'll jump on the china charger bandwagon.