The Official EMU Tuning & prob thread! Launch control success thanks to fur!

[HYBRID]

Just thought I would ask but does anybody have any issues with there car starting? It seems like mine always takes like 2 cranks or maybe 3 sometimes! Is there a certain value that needs to be changed in the throttle box???

I have a TPS style open and close not variable. Any help be apperciated.

nothing to do with the tps buddy, sounds like its a problem related to your fuel system possibly you injectors.. what injectors are you running, with what lag time settings on the emu, & in what condition are they.

kon

 

[terccraz05]

nothing to do with the tps buddy, sounds like its a problem related to your fuel system possibly you injectors.. what injectors are you running, with what lag time settings on the emu, & in what condition are they.

kon

I have Sard 550cc injectors new condition only been in the car for about 3 months. I have a Walbro 255 lph and a FPR set to 40psi.

I tried messing with the lag time like your asking. I set the after value as
550cc and 0.85 lag time. But as soon as I try putting the stock 295cc lag time in 0.93 I believe the car dies. Any reason why?

Also is there a way to adjust cold start fuel? Like can we add fuel for when we start the car and then after it starts it switches back to the regular map?

 

[HYBRID]

ok so very simply your car is dying because the emu simulates lag times, it does not actually need the exact values.. the way you should tune the lag times is with your eyes on your wideband, set the initial values as:

Before After
295cc 550cc

& start increasing decreasing the lag times on either side, (start with the before side) by 0.1ms untill u get a reading close to 14af, after that go to the i/j map & reduce a little more to get that perfect 14.7 ; 15af on idle

kon

 

[terccraz05]

ok so very simply your car is dying because the emu simulates lag times, it does not actually need the exact values.. the way you should tune the lag times is with your eyes on your wideband, set the initial values as:

Before After
295cc 550cc

& start increasing decreasing the lag times on either side, (start with the before side) by 0.1ms untill u get a reading close to 14af, after that go to the i/j map & reduce a little more to get that perfect 14.7 ; 15af on idle

kon

Okay i'll give it a try in the morning. So is there a cold start setting where we can dump fuel into the motor?

I am running E85 and so when it 32 degrees outside 0 Celsius tor lower he car doesnt start for shit. I looked it up and they say you have to dump fuel into the motor to start it up.

 

[ragz]

how does the injector adapter no2 effect the running ov the car?

the reason i ask is cause past few weeks iv been havin a fuel cut problem with my car, drive slowly n it drives fine as soon as i floor it. it starts jerkin or fuel cutting coudnt go past 3.5k ish. tried numerous things n narrowed it down to emu

thaught it was fooked. come to take it off totally n noticed the inj adaptor no2 box so decided to disconnect that n go for a drive

the car was back to normal boostin like it should n letting me rev past 3.5k all the way to redline

anyone no why that little box would cause fuel cut probs

thanx

 

[terccraz05]

how does the injector adapter no2 effect the running ov the car?

the reason i ask is cause past few weeks iv been havin a fuel cut problem with my car, drive slowly n it drives fine as soon as i floor it. it starts jerkin or fuel cutting coudnt go past 3.5k ish. tried numerous things n narrowed it down to emu

thaught it was fooked. come to take it off totally n noticed the inj adaptor no2 box so decided to disconnect that n go for a drive

the car was back to normal boostin like it should n letting me rev past 3.5k all the way to redline

anyone no why that little box would cause fuel cut probs

thanx

I haven't had any issues like that. Do a map trace and see what cells are causing you problems.

 

[terccraz05]

ok so very simply your car is dying because the emu simulates lag times, it does not actually need the exact values.. the way you should tune the lag times is with your eyes on your wideband, set the initial values as:

Before After
295cc 550cc

& start increasing decreasing the lag times on either side, (start with the before side) by 0.1ms untill u get a reading close to 14af, after that go to the i/j map & reduce a little more to get that perfect 14.7 ; 15af on idle

kon

I tried your setting/input and it still just dies. It only works with my settings like this:

295 550
0.0 0.90

I sit perfect around 14 afrs

 

[HYBRID]

thats why i told you to adjust it step by step in incriments of 0.1 at a go..

kon

 

[terccraz05]

thats why i told you to adjust it step by step in incriments of 0.1 at a go..

kon

Well I did what you said. To start like this: 295 550 and then adjust from there. As soon as I took the lag time out the car died. I then tried adjusting times and the car wouldn't start again...

 

[HYBRID]

Well I did what you said. To start like this: 295 550 and then adjust from there. As soon as I took the lag time out the car died. I then tried adjusting times and the car wouldn't start again...

well that happens.. so basically u had to put it at 0.9ms on the 550cc to get it to work well right?

kon

 

[terccraz05]

Yeah. I'll probably just leave it there

 

[ragz]

I haven't had any issues like that. Do a map trace and see what cells are causing you problems.

not done a map trace yet but car started missing again same as before but when i dissconect the EMU the car runs fine

any idea what the problem can b lads

 

[FeNder]

got a real weird one here guys ,
car was running fine with the settings as is till i was forced to use a crappy set of plugs , sounded like running on 3 cylinders , changed to some denso ones atlast , started after a miracle , had to insulate the coil from the brake master cylinder , too close...!
and play with the Emu throttle settings till it started , whenever i touch the throttle the car dies , numbers in the throttle paramters settings keep jumping around like crazy , whats up with that ?

 

[HYBRID]

dylan this this ever get going were you can posts maps?

you can post the maps anywhere on the forum i think.. best would be to post them in this thread though, it will be better to collect information & keep the forum tidy.

kon

 

[HYBRID]

got a real weird one here guys ,
car was running fine with the settings as is till i was forced to use a crappy set of plugs , sounded like running on 3 cylinders , changed to some denso ones atlast , started after a miracle , had to insulate the coil from the brake master cylinder , too close...!
and play with the Emu throttle settings till it started , whenever i touch the throttle the car dies , numbers in the throttle paramters settings keep jumping around like crazy , whats up with that ?

sounds like the throttle wire (grey from memory) is earthing somewhere buddy.. other than that try re-setting the throttle parameters.

kon

 

[FeNder]

well one wire is earthing to the stock ecu casing hook , removed that ,
now it lost all power , gotta follow the emus red wire wiring its not powering up

 

[HYBRID]

well one wire is earthing to the stock ecu casing hook , removed that ,
now it lost all power , gotta follow the emus red wire wiring its not powering up

sounds like a short then buddy... trace it coz it could damage your unit!!

 

[azerty]

just out of curiosity.

what injector lagtime have you guy used when fitting 550cc injectors ?

 

[azerty]

Ok, I did ask this question cause I realized 550cc injector lag specified here (0.70ms) wasn't working. the car was just jerking like it was running on 3 cylinder, so i tried other injectors, result was the same. so I tried other lagtime. and car was running fine. so here is my setting for DENSO 195500-2020 Mazda RX7 550cc injectors :

standard injector : 0.90 ms
new injector : 1.12 ms

 

[azerty]

something I have been wondering .
in the timing map. do values are degrees or % ? I have assumed all these years it is degrees as it would make much more sense. but, better check as injector map is %, timing could be the same...