Car won't hold boost for crap!
 

If this has been asked before and you know which thread it is feel free to direct me.
Ok so my turbo won't hold boost for shit! As soon as I go on boost it spikes to like 16psi then it goes down to 14psi where it should be and by 6k it's down at like 12psi. It really pisses me off cause I'm loosing 10-15 hp at top and my torque drops like a bitch. If you saw my dyno graph it also didn't help that I was going rich at 6k. Soooo what can I do to fix this?

stock greddy wastegate right? look to replace the actuator or run some helper springs.

Yes indeedy, my boost needle was all over the place until I replaced the greddy actuator. You'll probably end up with boost creep though. (positive)

Yep- most IWG actuators start to flake out around double the rating in a boost controlled environment. BTDT. Logging a run with the wg wire shut does wonders for trouble shooting. Just make sure you've got your boost cut where it needs to be for the run.

Which wastegate do you guys recomend?

Where are you getting your signal for your wastegate from?

I replaced my wastegate actuator with one from a new GT2871 and I got boost faster and held MUCH better than the Greddy unit.

Compressor

Then check out this thread my friend.

https://www.miataturbo.net/forum/t32479/

Should at least help the issue.. if not resolve it altogether.

If hes not getting boost creep now that means hes got plenty of flow bypassing the turbine so he wouldnt later.

What he has is boost spiking.


Here is where the WG is tied to.. (the line in the background is an oil line and doesnt connect to the wastegate in any way..)
Attachment 202429

Why is that not a sticky? That is awesome information, I'm going to try that and upgrade my wastegate. Tune my fuel towards redline a little and hit a dyno again should make a 10-15 hp difference

shoulda looked at how mine is plumbed when you had the chance...

http://www.boostedmiata.com/gallery2...serialNumber=3

The nipple just before the TB feeds the wastegate actuator. My boost is so steady you can rest your drink on it.

You shoulda looked at mine and helped a nigga out when I was complaining about my boost drop at the dyno

hahah. or that. I was just trying to find someone for you that knew anything about the DINK ecu.

Isnt your BOV open at idle/vacuum sir?

a little crack...why?

Just curious since its still an unfiltered gap

I don't care about things like that.

Does air even get sucked into it? I'm pretty sure the airflow is always out the BOV never in.