Miata with SAFC and 440cc hard to start
 

Hello Miataturbo peeps!

Im actually into a dead end and can't find the way out!! I really hope you guys can help! First I will describe my setup with the more details I could give so you guys can get the right info before trying to help!!

Car : 1989 JDM miata
Engine : 1.6 STOCK

Custom turbo kit, 13g turbo from an eagle talon
2.25 inch piping with a 22 X 6 X 2.75 intercooler
2.5 inch downpipe and 2.5 inch full exhaust no muffler, no cat , no resonator
Turbo XS BOV
Ebay turbo manifold
Stock FPR
Stock Fuel pump
Stock AFM
Rx8 Green injectors 440cc high impedance
Apexi SAFC
8 psi of boost
AEM Uego Wideband

i think thats it!!


So the problem is starting the car... it start.... after like 20-30seconds sometime 1min cranking... and with the gaz pedal to the floor.. but once its started A/F is PERFECT varies from 14.7-14.9 on idle and cruising in the city with no load. During boost the A/f varies from 10.7-11.2 (which is a little rich but doesnt matter for the moment). I already tightened the AFM spring because even with the lowest value on the SAFC the car was running WAY TOO RICH!!

So when its started the car runs perfect!! when is stop it and try the re-start it again its the same story again cant start it well except cranking it 30sec or so..

anyone have an idea other than going with MS! i build this complete turbo kit for around 800 bucks and its a kind of challenge i gave to myself building the cheapest and reliable turbo kit possible for my car.

If i could simply tweak a sensor to get less fuel injection on start because i clearly smell gaz during the cranking process before it start..

Oh my....I don't even know what to say. :crx:

I've been running that turbo kit for 1 complete year on FMU and 260cc injectors...

I changed to bigger injectors only 2 days ago...otherwize the car was running fine except a little to borderline on a/f and had no control on it without a safc!

dont threw on my post..help is definitely more effective than throwing rocks to a person!

once i get it starting well ill post up some video of the car pulling some gear to show u guys the impressive result for the low cost

"Miata with SAFC and 440cc hard to start"

^Theres your problem.

Sounds like your car has lost the will to live. Can't say I blame it. RIP


Yeah but it's not as fun.

No

I'm not sure you understand what the word IMPRESSIVE means.

It is not the same as "PIECE OF CRAP"

You are confused.

Wow... i was hoping to get help or advice... not this kind of answer...

guys how can u juge someone's car without even see the result of it.. you guys should be less negative and be more open mind to others idea than spend 10 gran and expert a race car.. this is a daily car and not intend to drag race .. its just for fun

See you are just looking at this from the wrong perspective. You are thinking "why isn't my car running?" when you should be thinking "holy fuck I can't believe it ran for that long!"

We know its a piece of crap because you told us its a piece of crap.

We will give you advice, but it wont be how to further ghetto rig it. You want advice? well here it is.
THROW THE SAFC IN THE FUCKING GARBAGE. It is a piece of shit that has no use on ANY car. If anybody tells you otherwise they are retarded.
Once you have thrown the SAFC in the garabge, pick up a megasquirt and welcome yourself to the world of proper engine management.

Also, did you get those used injectors cleaned? If not, stop boosting before you melt a piston.

the injectors are brand new , and was provide with a flow chart and was tested on a bench...

instead of telling me throw the SAFC in the fucking garbage i would like to understand WHY its not good?? I want to understand why its not good as you say and then i could get a good opinion about it.. because so far you didnt told me any point why its so bad!

Dont just tell someone dont do it... help him understand why.. because now im really lost about it why..

Yes i understand your point now.. but i already changed my timing advance for 5 degree less.. it may not be exactly perfect but for now on its gonna be so...

well lookslike i wont get my answer here anyway.

I dunno about previous user maybe they just pissed you guys with retard question but my question wasnt that stupid .. im just trying to make the car start easier. Im not getting any predetonation and im not running lean either.. Of course I know a standalone like MS is always better, but I would like to try without it.

It's not that your question is dumb. It's just that you have compiled the "list of parts to absolutely not buy" which until today didn't actually exist in reality. But here you have done all the hard work and gathered them all up, as an example to everyone for the future.

This shit is confuckulated, there's your problem.

If you are absolutely hell bent on using that confounded piece of shit, at least do it right. Cut the wire that taps into the TPS, and instead wire up a map sensor as the adjustment mechanism. TPS is a fucking horrendous way to determine load on a turbocharged car.

https://encrypted-tbn1.gstatic.com/i...yrcG2PdcDgZd0w

Im already using a map sensor instead of the TPS sensor as the "fake tps signal" in the SAFC. I knew that already i just forgot to mention it.

And as you can read clearly like i said. Its really giving an IMPRESSIVE pull for the 800$ I spend... i doubt you could find a miata with a total of 800$ engine mod to pull that good as mine... not saying im the number 1, im just saying i think i did good with a budget that low. I planned at the beginning a 1000$ turbo kit just for fun.

Well anyway i'll try to figure this out tomorrow.

BTW if it could interest anybody i made a video of my miata project online if anyone curious to see how its running

Jesus fucking christ.

You already said you wouldnt listen, so just go away. Check out clubroadster.net, ignorant people are welcome there.

Oh geez, he is Canadian too

Ok your problem is that the car is injecting WAYYYYYYYYYYY too much fuel at cranking. Hence why you need to floor the throttle (which puts the car in flood clear mode and doesnt inject fuel). You dont have the ability to adjust this with your current engine management system.

Dude, your car is a PIECE OF JUNK. Seriously. No one is impressed. At all. We are all disgusted.

Being proud of that, is like being proud of a giant smelly diarrheal dump you took in the bathroom.

That's like saying "I'm not saying my house is the nicest house ever, but for a cardboard box it's pretty nice".

Most people here spend more on engine management than you did on your entire turbo system. Which is why theirs start and yours doesn't.

If you have $200 of budget left over.... Buy a megasquirt, sounds like you already have a wideband. For $200, you're looking at used, or even a Ms1. Either will actually work vs a piggy back which will always be a dangerous compromise.

I lol'd...

Hay gauyzzzzz I also want my miata to tow 8000 lb. I baught a class 1 hich and hooked it up but now when I connect my horsey trail0r to it the hitch touches the ground and my car looks like it's going to flip over. Wat shud i do-ezzz? I was able to tow my roach coach hotdog stand before but I need to tow my horsy's now.

How ridiculous does this sound to you? because what you have told us OP is not far off.

just gaz it dawgggg

gaz it

Are you having fun with your car that doesn't run even close to right at the moment?

:bowrofl::bowrofl::bowrofl:


OP,
If youre still listening, THIS^ is real advice. If you had spent 10 minutes searching you would have known this.
This forum is so tailored to budget enthusiast that you see it mentioned in grassroots motorsports, but even we consider an MS1 a MINIMUM. Anything less is dangerous and stupid.

Sorry if I skipped over it, but is the SAFC tuned? Like someone mentioned before, it sounds like the car is super rich when cranking. It would be pretty easy to use the SAFC to pull fuel below 500 or 1000 rpms and hopefully resolve, or at least minimize, your cranking issues.

Whoa whoa whoa. Hold up there.

Are you insinuating that you can actually tune with an SAFC?

It does have shinny buttons on it and a display.

That much i knew.... i have one. I just figured it belonged in a museum display case along with this freshness i'm putting in my display.

https://www.miataturbo.net/attachmen...ine=1362080219

https://www.miataturbo.net/attachmen...ine=1362080219

https://www.miataturbo.net/attachmen...ine=1362080219



Although.... my SAFC looks too modern.

https://www.miataturbo.net/attachmen...ine=1362080219



Maybe i need one of the originals that was just one knob that adjusted the entire rev range at once. As you can imagine, it was REALLY useful.

ACHIEVE THE DRIVING HIGH. APEXI, IT'S THE SUPREME.
http://www.rx7club.com/attachments/2...-apexi_afc-jpg

Then they were all like SHIT GUISE!!! WE NEED SOMETHING SUPER!!! ADD MORE KNOBS!!!
http://wctsmultiservizi.com/wp-conte...012/09/145.jpg

All Hail Concealer404, King of the Band Aides!

I am the King of Shit!



Ok but really...

OP, don't be a dildo. Get a fucking Megasquirt.



Post 666 FTW!

I'm gonna go with something along the lines of:
"because its a piece of junk, it cannot manipulate start up enrichments, therefore pulling fuel at low rpm will simply make it super lean when its actually running"

that and the fact that OP said its already on maxed out trying to take out fuel.

This, to the point that he's started to fuck with the spring in his air metering system...

Which you know, tricks the ECU into thinking the load being presented to it is less than it actually is.

Sooo.... YAY! MOAR TIMING!!!!! :fael::vash2:

All garbage.

I bet OP is at like 40 degrees advanced in boost

like a boss:giggle:

hello again miata turbo peeps!!

I just wanted to update you guys about the solution I used!!

I simply put a relay on the fuel injection fuse (keeping it fused of course) this allow me to cut fuel injection for the first 2-3 crank then activate it and start perfectly!

BTW thank you Leafy, your answer was clear and simple and you where polite.

Seems legit.

I guess the stock flood clear mode was too complicated.

I can't possibly laugh any harder.