Fuel Cutout while spooling - Miata Turbo Forum - Boost cars, acquire cats.

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View Poll Results: Biggest douche in the universe?
04gt2860RS 28 63.64%
John Edwards 6 13.64%
Standalone ECU users 1 2.27%
Constant boosting truboz 3 6.82%
550s on stock ECU users 6 13.64%
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Old 07-27-2008, 01:32 AM   #1
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Question Fuel Cutout while spooling

I have just finished my project of adding a GT2860RS Turbo and a custom 3in exhaust on the car. I have added a BOV right before the manifold. I started the car and it runs fine, but on a road test the car seems to lug a little and at about 5250rpm it falls on its face and cuts out. I dont know if this is a tuning problem, vacuum issue or what. Any help in this matter would be great. The car dyno'd at 248.7hp and 220 ft/lbs even though it huccups at 5250rpms. I cannot get the car to pull through the rpms correctly. Please advise. Thanks!
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Old 07-27-2008, 08:58 AM   #2
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gonna need a little more info than that, like what are you doing for engine/fuel management at least.
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Old 07-27-2008, 01:31 PM   #3
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horrid first post... you need to make an intro post in the "I'm a mother ******* newbie" forum. Add your location to your profile, add car specs to you sig. Then we might be more helpful
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Old 07-27-2008, 01:33 PM   #4
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So far I'm running off the stock ECU, no piggy back yet. I am in the process of adding 550cc injectors and a fuel pressure regulator to cut the injectors back some. I dont know if the car is leaning out too much while building boost from low rpm's or what. I know im going to need some type of fuel managment, but I dont know what is the best for the money. Im new to this game. The car will run fine through 1st 2nd and 3rd, but it will cut out in 4-6th. It doesnt really matter what boost levels im running, ive tired it all the way from about 11psi to 22. Still cuts out. I also cannot get my BOV to work, my stock diffuser valve is too weak and leaks at idle, but the BOV doesnt function and I have some bad compressor surge.
Any help would be awesome.
A few minor tweaks and this car will have 300+ whp easy.
With that hiccup at 5250 it still had 248.7 whp at 8psi
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Old 07-27-2008, 02:14 PM   #5
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wait, you've tried 22 psi on the stock ecu and small injectors?
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Old 07-27-2008, 02:24 PM   #6
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... 22psi on the stock ECU? Looks like this noob is going to ban himself from life. Also if it only leaks at idle then whats the problem? Why are you trying to make boost at idle?
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Old 07-27-2008, 02:26 PM   #7
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Quote:
Originally Posted by 04gt2860RS View Post
So far I'm running off the stock ECU, no piggy back yet. I am in the process of adding 550cc injectors and a fuel pressure regulator to cut the injectors back some. I dont know if the car is leaning out too much while building boost from low rpm's or what. I know im going to need some type of fuel managment, but I dont know what is the best for the money. Im new to this game. The car will run fine through 1st 2nd and 3rd, but it will cut out in 4-6th. It doesnt really matter what boost levels im running, ive tired it all the way from about 11psi to 22. Still cuts out. I also cannot get my BOV to work, my stock diffuser valve is too weak and leaks at idle, but the BOV doesnt function and I have some bad compressor surge.
Any help would be awesome.
A few minor tweaks and this car will have 300+ whp easy.
With that hiccup at 5250 it still had 248.7 whp at 8psi


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Old 07-27-2008, 04:33 PM   #8
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you made 250 whp on the stock injectors and ecu with no timing or fuel management...

that's pure bullshit.

You FAIL.
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Old 07-28-2008, 08:36 AM   #9
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Thumbs down Get over it


Holy **** guys, Im sorry I know how to make a car perform without spending thousands on fuel managment. Yes, I have documentation of the car running 250whp without fuel managment or bigger injectors. Give me a break here, Im no idiot, and dont be jealous to say its BS. Get over yourselves, im looking for help here. I trial ran the car at 22psi, Im driving it at 8, read and understand before you jump in, how about that? Go ahead and think what you want, Im the one driving the car.

Thanks for the help, wait, no one offered any. Ha.
I build cars, I moved from 302's to a miata. I was thinking over 500 hp in a heavy car wouldnt be as fun as a light car wth a little over half that. Obviously big numbers scare you.
I'll just stick with my previous intuition and get bigger injectors and a fuel pressure regulator.
See you Ladies on the road. Actually, I hope not for your sake
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Old 07-28-2008, 08:40 AM   #10
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Oh, so you think you know how a car runs?
Last time I check a turbo is always making boost, and at idle the BOV or Diverter valve is either releasing to the atmosphere or recirculation. And if it leaks at idle the car will stall out, or run like crap.

Maybe you should know what you are talking about before you jump on the bandwagon of these other criticizers
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Old 07-28-2008, 08:43 AM   #11
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Experience on a website and forum

Real world building and testing experience guys.

Im new to building tuning a turbo car, thought this website was all about helping each other but I guess its all about who thinks they are cooler. Welcome back to highschool for some of you. Maybe you were the kid I used to make fun of, or the ones that were jealous of me because I know what I am talking about and know how to perform.
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Old 07-28-2008, 08:47 AM   #12
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Quote:
Originally Posted by 04gt2860RS View Post
Experience on a website and forum

Real world building and testing experience guys.

Im new to building tuning a turbo car, thought this website was all about helping each other but I guess its all about who thinks they are cooler. Welcome back to highschool for some of you. Maybe you were the kid I used to make fun of, or the ones that were jealous of me because I know what I am talking about and know how to perform.
Wrong, we are the ones with experience... laughing at you on the other side of our computer screens. And most likely the ones that would laugh at you in person when you start talking about running your car like you say you do.

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Old 07-28-2008, 08:52 AM   #13
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Originally Posted by Splitime View Post
Wrong, we are the ones with experience... laughing at you on the other side of our computer screens. And most likely the ones that would laugh at you in person when you start talking about running your car like you say you do.

Go ahead and believe yourself there champ, Im sure your car is the best there is...
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Old 07-28-2008, 09:21 AM   #14
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If there is anyone that can offer help, I would appriciate it. Doubters dont bother posting
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Old 07-28-2008, 09:32 AM   #15
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oh smart guy you have a MSM, that changes things a bit. You have an ECU designed for boost....It also has a thing called a boost cut, where you can only run X amount of psi. IIRC, it's 13psi....
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Old 07-28-2008, 09:34 AM   #16
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Quote:
Originally Posted by 04gt2860RS View Post
Oh, so you think you know how a car runs?
Last time I check a turbo is always making boost


fail.
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Old 07-28-2008, 09:54 AM   #17
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Is your car a 04-05 MSM?

<edit> by the time I was able to hit submit, the answer was already given

In that case, there still is not 250 whp worth of fuel in those injectors. What was your correction factor?
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Old 07-28-2008, 10:03 AM   #18
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04-05: so the pic suggests. and now his sig states it too. < edit, by the time i finished posting this ben edited his reply >

oh and 250 is not a big number, especially in a bloated MSM.

anyway, you can't just throw 550s in, your ecu won't be able to idle them. So you better come up with a better plan. So far people have failed on the MSM with the E-manage blue and ultimate. I've only heard of one person who has done a Megasquirt in an MSM, and yes it was successful.

Hope you have $2k to drop on a hydra or you are gonna need a lot more to replace the engine too.

I suggest starting the apologies now or find a new forum to get **** on by. You've already admitted you know **** about turboing a car, well there is no better forum to learn.
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Old 07-28-2008, 10:53 AM   #19
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Quote:
Originally Posted by 04gt2860RS View Post
I know how to make a car perform without spending thousands on fuel managment.
Im no idiot
I build cars
Quote:
Originally Posted by 04gt2860RS View Post
Im new to building tuning a turbo car

you fail, go away.

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Old 07-28-2008, 11:11 AM   #20
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I vote for Giant Douche... EDIT: that poll is gonna be close.
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