I had my miata tested this morning (national car test), everything good apart from emissions.

My CO% was 8.39% way above the 3.5% limit and HC was 572ppm which came in under the 750 limit.

I recently fitted a walbro 190hp and now i'm running very rich at idle

My guess is the walbro is over powering the stock reg but I thought this was only a problem with the 255 pump. Can the stock regulator get weak?

I could always change back to the standard pump for the test but would rather sort it out.

Any Ideas?

Set up is 1990 1.6, greddy turbo @8psi, 2.5 inch exhaust, decat, FMIC, Vortec FMU (8:1 disc), BIPES, O2 clamp, walbro 190hp, 265cc injectors & forge valve.

 

Its the bandaids and bigger injectors without a tune.

 

Totally unhelpful response, why did you bother.
I know a lot of the people on here ran a similar set up a few years back.

It was reading below 1.3% before the walbro

 

Well then why are you asking here. Toss the stock pump back in and go pass.

 

Because I thought I might get an intelligent answer.

 

Well you have 2 real choices, upgrade to a stand alone and blow the emissions testers out of the water with how clean you can make it run. Or de-mod back to the state it was in the last time it passed. This is miata turbo, we're the only gays that dont have aids.

 

If you're unwilling to go 'squirt, and you want to pass emissions, your best bet would be to pair a BEGI adjustable rising rate with an adjustable FPR. It's well documented that the OEM FPR will not tolerate a 255 pump.

I can sell you a BEGI rising rate cheap cheap which is an upgrade from the Vortech in terms of 'tune-ability'. It is, however, still dated technology. Which is while I'm willing to sell it cheap.

-Zach

 

I understand you like the sound of your own voice but there is no need to respond with obvious solutions, I already said I could d-mod and never mentioned wanting advice on upgrading to a stand alone. I will leave blowing emissions testers to you.

I would still like to find the issue. Can anyone speak from experience.

 

Thanks Zach, the pump is a 190hp which is why I was asking. I knew about problems with a 255. I thought about replacing the stock reg with an adjustable but wanted to see if anyone had the same problem (even if it was a few years ago) before I shell out for a new reg.

Thanks for the offer of the begi, I'm in ireland so not sure how the postage would work out, i'' look into it.

 

While i do believe that people should just not respond to threads like these, then they would slip away with 0 replies and be forgotten. I also think that maybe OP should figure out why it's rich, and what he has done to make it do this.

Stock FPR has been known to fail on the 190hp pump (from what i remember seeing on this forum(for some reason the 1.6 ones seemed to be better though)). Do you have a fuel pressure gauge?

I must admit, running all these bandaids isn't helping, along with not using a cat.

 

Little harsh ger.

But your dumping a lot of fuel (bc. What are the AF ratios looking like?

 

This guy is a ****** troll.

 

Should a good stock FPR keep pressure with a 190hp?
If not is there a good replacement for the stock fpr?
Why is the de cat a problem?

Just looking for some simple advice on how to keep pressure in Hg with my current set-up. thats all.

 

 

Should a good stock FPR keep pressure with a 190hp? Maybe, sometimes.
If not is there a good replacement for the stock fpr? Megasquirt, stock fuel pump and stock FPR.
Why is the de cat a problem?

 

if the 190 doesn't work try a walbro 450lph

 

 

Lol the wally465 (400E85), is starting to kill my AEM fpr I think. It very slowly weeped around the bolts that hold the fpr together until I cranked the **** out of them. And the tiny 18-16ga ish stock wiring gets too hot for comfort with it. Its really quiet though.

 

Just wrap foil tape around the wiring to keep the heat off the other components.

 

I think my 189k stock fpr is leaking a little bit with a new stock replacement fuel pump.