MX5 Turbo 1990 MS1 Lean AFR (Air leak???) - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 06-27-2014, 12:22 PM   #21
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So hopefully the new gasket solves the issue.

.
I bet it wont.

But feel free to ignore me and keep telling yourself that the surface is not warped
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Old 06-27-2014, 12:27 PM   #22
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Okay well I have ordered a new gasket, some vacuum hose and some heat sheilding which should be here in the next few days, from what we have checked there is no more leaks in the piping just the exhaust leak now, as the car no longer sounds like its strugling to idle like it was before with the air leak its smooth but just surging a bit between 1000-1100rpm and the obvious lean AFR.

So hopefully the new gasket solves the issue.

Also if I have the manifold leak that means the car will have more boost once its fixed so should be a interesting test drive once its all fixed...
Awesome!

I would check into options if you haven't already to have the manifold resurfaced for a true flat fitting. That plus the gasket would completely seal the exhaust up and possibly prolong the life of the replacement gasket. Less likely chance of you ending up with the same result.
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Old 06-27-2014, 12:30 PM   #23
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OP should do a quick search about gaskets, we've had at least a couple threads discussing this.

The bottom line: you don't need a gasket. Any gasket. But if you absolutely must get a gasket, it better be stamped multi-layer steel. Everything else is pure garbage
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Old 06-27-2014, 12:46 PM   #24
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The bottom line: you don't need a gasket. Any gasket. But if you absolutely must get a gasket, it better be stamped multi-layer steel. Everything else is pure garbage
This ^^
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Old 06-27-2014, 12:52 PM   #25
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Originally Posted by 18psi View Post
OP should do a quick search about gaskets, we've had at least a couple threads discussing this.

The bottom line: you don't need a gasket. Any gasket. But if you absolutely must get a gasket, it better be stamped multi-layer steel. Everything else is pure garbage
The previous gasket was multilayerd but when refitting it, because i had to get it off the ramp at the garage and get it back to mine i had to fit a shitty composite gasket I have ordered a new gasket now so hopefully everything goes well.

The gasket I have ordered is from autolink who do a ton of spares for the MX5 and there parts are pretty decent from what i have heard: http://www.autolinkmx5.com/exhaust-m...6-mk1-71-p.asp
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Old 06-27-2014, 01:04 PM   #26
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Awesome!

I would check into options if you haven't already to have the manifold resurfaced for a true flat fitting. That plus the gasket would completely seal the exhaust up and possibly prolong the life of the replacement gasket. Less likely chance of you ending up with the same result.
Im not exactly sure where i would get it resufaced around here but I do have a friend who works for a company that build show cars and see if he knows any where i can get it done and for what sort of money
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Old 06-27-2014, 01:15 PM   #27
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Any workshop with a belt sander would prob be able to do the work, it'd take only a few mins
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Old 06-27-2014, 02:07 PM   #28
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Any workshop with a belt sander would prob be able to do the work, it'd take only a few mins
Well the gasket should be here monday so Ill see if i can get a friend to take the manifold with me to get it done.

Just hoping this is the last hiccup with the build so it can run right finally, cause you always have some sort of issue with builds like this it never goes 100% perfect first time but its dam frustrating.

Then ill prob be running the car and focus on some of the body work until later down the road Ill get my hands on another long nose block and forge it.

Also I have a MS1/Extra by reverant would i be able to connect my clutch switch up and use launch control? or is this only availible on MS2+?
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Old 06-27-2014, 05:01 PM   #29
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Also I have a MS1/Extra by reverant would i be able to connect my clutch switch up and use launch control? or is this only availible on MS2+?
Not sure, I'd send Rev a PM
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Old 06-27-2014, 05:07 PM   #30
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I PM him on the nutz forum but no reply yet.

I'll just try and do some more research and see what I can bring up
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Old 06-29-2014, 09:00 AM   #31
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Fitted a new gasket, no more leaks now but still have the same issue with high AFR and it still sounds like it is miss firing on idle every now and then but if you rev it up its fine no miss fire or hesistation.

The only thing i can think of doing next is using a smoke tester and checking for any leaks I cant see?
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Old 06-29-2014, 01:59 PM   #32
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Fitted a new gasket, no more leaks now but still have the same issue with high AFR and it still sounds like it is miss firing on idle every now and then but if you rev it up its fine no miss fire or hesistation.

The only thing i can think of doing next is using a smoke tester and checking for any leaks I cant see?
If the car is having a high idle & high AFR I'd check for vac leaks. The high AFR alone could potentially lead to other things like a sensor, or tuning issue if the megasquirt is causing the high AFR.

As for the misfiring @ idle, what is it in terms of quality.. bad idle, good running when it's started cold vs hot? Have the injectors been looked into as an issue?
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Old 06-30-2014, 02:03 AM   #33
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Originally Posted by Girz0r View Post
If the car is having a high idle & high AFR I'd check for vac leaks. The high AFR alone could potentially lead to other things like a sensor, or tuning issue if the megasquirt is causing the high AFR.

As for the misfiring @ idle, what is it in terms of quality.. bad idle, good running when it's started cold vs hot? Have the injectors been looked into as an issue?
It idles about 1000-1100 RPM and will conistantly alter inbetween and then sort of stumble which is when it sounds like a miss fire.

If you start it when its cold it will die without throttle and if you start it when its hot it will idle fine but thats with the IAT disconnected as i have never run it with the IAT connected as it runs to lean.

Should be going down the garage in a few hours.
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Old 06-30-2014, 01:04 PM   #34
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Okay i have not managed to get around to smoke testing the engine today as no-one has a smoke tester until tomorrow.

However i have been thinking and I may have come up with something that might be the cause of the issue. When i bought the engine the IAT sensor wire had just been cut and i was simply given two halfs of the wire to solder back together.

By be soldering the two wires back together i could have created resistance and inturn effect the IAT sensor?
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Old 06-30-2014, 01:51 PM   #35
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Wait.


You bought someone else's setup and put it all on your car but didn't autotune it for your car and expect it to run identically? You are an idiot.
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Old 06-30-2014, 08:55 PM   #36
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Wait.


You bought someone else's setup and put it all on your car but didn't autotune it for your car and expect it to run identically? You are an idiot.
Not exactly a idiot when the "setup" is EVERYTHING, that means engine, turbo, exhaust, ecu, piping, intercooler, wideband everything I mean everything that this map was setup on is in my car.

So not exactly a idiot... Idiot.

As for autotune i did run it tonight just to see how it would react and im 100% certain there is a leak some where but I wont no for sure until tomorrow like I said.

When i was running the autotune it was as if it was fighting something and it couldnt level its self out, the AFR reading were constantly up and down.
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Old 06-30-2014, 09:12 PM   #37
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Every car will run a slightly different fuel pressure, have different throttle percentage values, different idle air control valve values, different oxygen sensor voltage and resistance values in every different car you put it in, and more. Please continue.
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Old 06-30-2014, 09:12 PM   #38
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You realize that having different wiring already makes a giant change between how an ecu responds/controls everything right?

But you're still thinking that a replacement exhaust gasket will solve your problems so I guess I already know the answer, as well as your intelligence level.
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Old 07-01-2014, 10:49 AM   #39
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You realize that having different wiring already makes a giant change between how an ecu responds/controls everything right?

But you're still thinking that a replacement exhaust gasket will solve your problems so I guess I already know the answer, as well as your intelligence level.
Yeah, but there is just no way it would make such a difference where its hunting like this surely?

And not really but it was a issue since it was leaking and had to be replaced and in dianosis its a process of elimination anyone with half a brain cell would know that.
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Old 07-01-2014, 11:22 AM   #40
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Did you do a free air calibration on your o2?
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