2000 Miata breaking up under boost
#1
2000 Miata breaking up under boost
Having an issue where the car doesn't want to accelerate in boost. Makes a like a rapid fluttering or popping sound from the exhaust. AFR looks like it is leaning out too. Out of boost it seems to drive like a normal Miata. I've had three different tuners look at the car but no solution. Two of them were new to Megasquirt and more familiar with LSx. The most recent one was from Begi turbo. Only place near me willing to look at it. Did a compression check and leak down test just incase which all checked out. Still new to Megasquirt and tuning myself and wondering where to go or test next.
Car is an Exocet using a 2000 Miata donor. FM turbo kit and exhaust, 750cc injectors, Walbro 255 fuel pump, DIY Megasquirt 2. Rebuilt engine with Manly rods and everything else stock. Using the stock coils with BKR7E spark plugs tried at several different gaps from 0.20-0.30.
Searching I found similar issues resolved with CoPs. I tried the Fab9tuning Denso CoPs and plugs, but it didn't change anything. Perhaps I need LSx coils? I'd like to get some other opinions before I go changing more things.
Car is an Exocet using a 2000 Miata donor. FM turbo kit and exhaust, 750cc injectors, Walbro 255 fuel pump, DIY Megasquirt 2. Rebuilt engine with Manly rods and everything else stock. Using the stock coils with BKR7E spark plugs tried at several different gaps from 0.20-0.30.
Searching I found similar issues resolved with CoPs. I tried the Fab9tuning Denso CoPs and plugs, but it didn't change anything. Perhaps I need LSx coils? I'd like to get some other opinions before I go changing more things.
#8
It does seem like it is inverted doesn't it? It appears rich at 11 idling and then pegs at 17 under load. One of the LSx tuners claimed the injectors were maxed out and simply couldn't give it any more fuel. Doesn't sound right.
I'll try to get a picture later tonight.
2000 Miata engine rebuilt stock except Manly rods.
FM Voodoo II Turbo kit.
Amsoil cone filter.
DIYPNP MS2.
Bosch EV14 750cc Injectors.
Walbro 255lph.
Exomotive fuel line kit.
AEM Wideband. This isn't connected to the Megasquirt.
FM Turbo catted midpipe and silencer. No muffler.
Coolant Reroute.
Fab9tuning CoPs and Denso plugs / Stock coils with Magnecor 8.5mm wires and BKR7E plugs 0.25 gap right now.
Odyssey PC680.
No P/S, No A/C, No Heater.
#9
That is what I've heard and was hesitant to take it there, but like I said I can't find anyone else who will touch a turbo Miata. I figure there has to be someone Texas that tunes something besides LS engines.
It does seem like it is inverted doesn't it? It appears rich at 11 idling and then pegs at 17 under load. One of the LSx tuners claimed the injectors were maxed out and simply couldn't give it any more fuel. Doesn't sound right.
I'll try to get a picture later tonight.
2000 Miata engine rebuilt stock except Manly rods.
FM Voodoo II Turbo kit.
Amsoil cone filter.
DIYPNP MS2.
Bosch EV14 750cc Injectors.
Walbro 255lph.
Exomotive fuel line kit.
AEM Wideband. This isn't connected to the Megasquirt.
FM Turbo catted midpipe and silencer. No muffler.
Coolant Reroute.
Fab9tuning CoPs and Denso plugs / Stock coils with Magnecor 8.5mm wires and BKR7E plugs 0.25 gap right now.
Odyssey PC680.
No P/S, No A/C, No Heater.
It does seem like it is inverted doesn't it? It appears rich at 11 idling and then pegs at 17 under load. One of the LSx tuners claimed the injectors were maxed out and simply couldn't give it any more fuel. Doesn't sound right.
I'll try to get a picture later tonight.
2000 Miata engine rebuilt stock except Manly rods.
FM Voodoo II Turbo kit.
Amsoil cone filter.
DIYPNP MS2.
Bosch EV14 750cc Injectors.
Walbro 255lph.
Exomotive fuel line kit.
AEM Wideband. This isn't connected to the Megasquirt.
FM Turbo catted midpipe and silencer. No muffler.
Coolant Reroute.
Fab9tuning CoPs and Denso plugs / Stock coils with Magnecor 8.5mm wires and BKR7E plugs 0.25 gap right now.
Odyssey PC680.
No P/S, No A/C, No Heater.
Also: What re-route does it have? Those CLTs kinda make me think it has a Begi "Racer" Reroute. If so, that needs to be removed and thrown in the trash where it belongs.
#12
oh boy. I wish you the best of luck, this needs a whole lot of diagnosing by someone that knows what they're doing. no one can help you if the information you're providing is completely worthless/useless because no one knows how your car/ecu is wired up.
until the data is accurate, we may as well be exchanging photo's of kittens
until the data is accurate, we may as well be exchanging photo's of kittens
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