Megasquirt No PW1=no fuel at cranking car
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Racing since u wre little
Joined: Apr 2011
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From: Goose Creek, SC
No PW1=no fuel at cranking car
I install a MS1 V3.0 on my rx7 bridgeport car and I'm having problems at start as is not activating the injector everything is been check several times thinking is wire problems but are none. I'm using the original setup that Aaron have on his website but nothing the car won't start. Plenty of spark but no fuel what so ever. I'm running MS1 extra have a zeal daughter board install, 550cc in primary and secondary's. Can somebody tell me what can be wrong or have a file with better set up to have the car start. Like I said I have exactly the same set up from Aaron's website, and as I'm not good posting pictures of the setting from Megatune I can't show you what I have, I search on the forum for 2 days and can not find anything. 
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Joined: Nov 2001
Posts: 206
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From: Springfield, MO
Okay, I'm no expert here, but here's some thoughts:
You've flashed it with the latest firmware, right? I didn't think Megatune worked with the latest firmware, but I can't say I really tried since I've always used TunerStudio. If you're running the stock FW, that is your problem.
Make sure to set up the cranking PWM for the injectors as well as the IAC.
Everything SHOULD start with Aaron's base maps, with 550cc injectors.
You've got spark, so the computer is seeing RPM (VR1). Make sure it's firing both the leading and trailing, as the trailing run the car most of the time. It's my (and I may be incorrect) understanding that VR1 operates the leading coil, and VR1 + VR2 operate the trailing channels A & B and the injectors.
Hope it helps!
You've flashed it with the latest firmware, right? I didn't think Megatune worked with the latest firmware, but I can't say I really tried since I've always used TunerStudio. If you're running the stock FW, that is your problem.
Make sure to set up the cranking PWM for the injectors as well as the IAC.
Everything SHOULD start with Aaron's base maps, with 550cc injectors.
You've got spark, so the computer is seeing RPM (VR1). Make sure it's firing both the leading and trailing, as the trailing run the car most of the time. It's my (and I may be incorrect) understanding that VR1 operates the leading coil, and VR1 + VR2 operate the trailing channels A & B and the injectors.
Hope it helps!
we got it to start, but it immediately dies
juan, now that i think about it, check your fuel pump wiring. I think the fuel pump is turning on when we crank it, but for some reason is turning off after it starts. try wiring it to always be on and see if it stays running
juan, now that i think about it, check your fuel pump wiring. I think the fuel pump is turning on when we crank it, but for some reason is turning off after it starts. try wiring it to always be on and see if it stays running
What does your warmup enrich look like? My HBP wants a ton of fuel when cold- 240% enrichment at 80, 225 at 100 and 195 at 130. And even at 240%, its still lean and wants to die.
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Joined: Feb 2001
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From: London, Ontario, Canada
You likely need more fuel. On a set of 550CC injectors, you'll probably need ~4mS to idle the car, and around 7-8mS when the car is cold. If it starts then stalls, it needs more fuel.
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Racing since u wre little
Joined: Apr 2011
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From: Goose Creek, SC
Thanks for helping me out...
Thread Starter
Racing since u wre little
Joined: Apr 2011
Posts: 51
Likes: 0
From: Goose Creek, SC
Thread Starter
Racing since u wre little
Joined: Apr 2011
Posts: 51
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From: Goose Creek, SC
-40C - 195
-29C - 195
-18C - 195
-7C - 195
4C - 180
16C - 165
27C - 155
38C - 145
54C - 132
100C - 100
Is not negative #
we got it to idle today for several minutes. but starting it is a pain! it hardly pulls any vacuum at idle. any tips for cranking settings? it seemed to help changing crank rpm from 200 to 1000
More fuel is a bigger number. This is my *rather rough* VE table. Note this is 9.4:1 S5 T2 HBP motor with S5 T2 I/Ms and 550cc injectors running NA currently. For some reason, my req_fuel is set to 10.5, so the VE will vary slightly. Map runs pretty rich all throughout on my engine. Ignition map is BDC's work for HBP's.
Crank RPM shouldn't be set nearly that high. It'll go into crank mode if you drop below 1000 RPM then. I have good luck at 400 RPM. I also remember seeing a post by muythai that mentioned some issues with time based cranking timing, so I have mine set to trigger return.
Also, try running the settings I have for the warmup wizard and see if it will run while cold on its own. What kind of vacuum is it pulling at idle? Mine at a 1500 RPM high idle pulls ~60 kPa and at 1000 RPM, it sits about 75 kPa
Crank RPM shouldn't be set nearly that high. It'll go into crank mode if you drop below 1000 RPM then. I have good luck at 400 RPM. I also remember seeing a post by muythai that mentioned some issues with time based cranking timing, so I have mine set to trigger return.
Also, try running the settings I have for the warmup wizard and see if it will run while cold on its own. What kind of vacuum is it pulling at idle? Mine at a 1500 RPM high idle pulls ~60 kPa and at 1000 RPM, it sits about 75 kPa
Thread Starter
Racing since u wre little
Joined: Apr 2011
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From: Goose Creek, SC
Well a update with the MS1 is that the car still start and stalls no success on trying to get it idle yet we are trying different fuel, spark and anything to get it right. I will keep posting if any success.....
Joined: Feb 2001
Posts: 29,798
Likes: 128
From: London, Ontario, Canada
Post an MSQ.
I almost guarantee it just needs more warmup enrichment, more afterstart, and more fuel in general.
Do you have any way to monitor AFRs?
Bridgeports take a LOT OF FUEL to start, warmup and idle. I figure it costs me 50 cents every time I start and warmup my car.
I almost guarantee it just needs more warmup enrichment, more afterstart, and more fuel in general.
Do you have any way to monitor AFRs?
Bridgeports take a LOT OF FUEL to start, warmup and idle. I figure it costs me 50 cents every time I start and warmup my car.
Thread Starter
Racing since u wre little
Joined: Apr 2011
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From: Goose Creek, SC
I can pretty much can started every time, but it stays on about 3200 sometimes a little bit down and stalls after 5 minutes of running. The bad part I just find out is that tuner studio is not reading the RPM's right on the laptop show like 5800 and the car is at live 3200 so all the tables are way off.
Aaron do you know how to calibrate this??? I'm lost in space now.
Aaron do you know how to calibrate this??? I'm lost in space now.
Thread Starter
Racing since u wre little
Joined: Apr 2011
Posts: 51
Likes: 0
From: Goose Creek, SC
Post an MSQ.
I almost guarantee it just needs more warmup enrichment, more afterstart, and more fuel in general.
Do you have any way to monitor AFRs?
Bridgeports take a LOT OF FUEL to start, warmup and idle. I figure it costs me 50 cents every time I start and warmup my car.
I almost guarantee it just needs more warmup enrichment, more afterstart, and more fuel in general.
Do you have any way to monitor AFRs?
Bridgeports take a LOT OF FUEL to start, warmup and idle. I figure it costs me 50 cents every time I start and warmup my car.