Apexi help on a Gen3

[RobEVo5]

Firstly hi all, just got my first rex and very pleased with it. And no doubt I will be on the forums a fair bit now.

As well as cosmetic mods, it has a full decat, airfilter, stock twin turbo, front mount, Pressure reg and fuel pump, and Apexi ECU.

The ECU allegadly has a generic map for these mods, and I know ideally I should get a live rolling road map.

But in the meantime I would welcome some help.

The car seems to be running very rich both on idle and on full chat you can smell the fuel.

The car itself is running fine, but think its running rich, which it better than lean but still not ideal and if anything like a piston car is probably loosing power.

If anyone has similar or the same mods as me. What should I been seeing when I go into the injector settings menu? same question on the boost ?.

I\'m not looking for the map cell settings at this stage, just what I should be seeing on the main injector setting and main boost setting ?.

Any help much appreciated.

Oh and what is an acceptable knock count on a RX7 ?. Obviously no knock would be good but as what point should I be worried.

Rob

[Rixio]

If its using the base map it will be running very rich for security so the car will still run but not at 100%, unless its already been mapped in which case its another problem...

[Red and Single]

Rob......

Please get yourself off to one of the vendors above and get it mapped mate,

1. You\'ll LOVE the difference in power and driveability!!
2. You KNOW it\'s safe.

Running rick can be as dangerous as running lean !! Ask Blitzboy who\'s engine failed due to too rich a map a couple of weekends ago !!

hth

[RobEVo5]

I will get it mapped, and it is currently running a map that is not stock and a copy of a map from another car that matches my mods.

I will get it properly done in time, but my question remains. I am curently seeing the following

In the boost settings:
1. Pr 0.80kg/cm2 56%
   sc 0.70kg/cm2 64%

2. Pr 0.95kg/cm2 62%
   sc 0.95kg/cm2 70%

And in the injector data:
Fr-pr 100%   0.00m/s
fr-sc            0.00m/s
Rr-Pr 100%   0.00m/s
Rr-Sc           0.00m/s
Q - Pr 550cc
Q- Sc 850cc

Is this what others have with the same mods that I have got, i.e Decat, Front mount, uprated fuel pump. The 100% in the injector data worries me at 100% and get the feeling this should be less.

It would help if i could understand what the figures are that I am looking at in the injector data section ?

anyone else ?

[dandan]

that looks like a base map to me, correct injectors set as high as they can for safety and standard boost (if .80kg/cm2 means .8 bar) of .8 primary and .7 secondary. I would not touch boost setting 2 yet, running .95 bar boost without a proper tune will be interesting. (and very short-lived!)

I wouldnt have a clue how you would drop the fuelling, but my advice would be to leave it be and keep your right foot under control until you can get it mapped.
I had a car running the wrong map (actually wrong ECU but you get the idea), it was booked in to be tuned but one moment of lead footedness cost me over £3000 for a rebuild.

[RobEVo5]

Lets try this from a different angle. If I had a wideband, what AFR should I being seeing on a Rex?

Thx

[RobEVo5]

Lets try this from a different angle. If I had a wideband, what AFR should I being seeing on a Rex?

Thx

have been surfing and found my own answer to this one.

high 14\'s up to "0 PSI" AKA atmospheric pressure (1 BAR)
mid 12\'s up to 6 PSI (1.4 - 1.5 BAR)
mid 11\'s up to 14.5 PSI (2 BAR) and above.

But any one, help with my original question ?.

[RobEVo5]

Been reading the handcontroller PDF after dowloading. And looks like these settings are right. this part of the setting allows you to alter the injector pulse and lag to allow for larger injectors should they be installed. 100% is the default value for standard injectors which I have so feeling a bit happier again now.

Still don\'t answer why it running so rich, looks like I better start looking at map cell values now, and either get myself a wideband, and just find someone local to me who can map.

[BlitzBoy]

unless you put a wideband on it you cannot be sure if its running Rich, I would advise against taking fuel out using the commander as you will end up with a lumpy fuel map, you need someone with a datalogit and wideband so you can log proper values against the cells.

I would only advise mid 11\'s afrs on high boost if you are running water injection, high 10\'s is safer as you have a safety margin against a bad tank of fuel or high intake air temps. Trust me I have learned the hard way.

I tune my car with a datalogit and wideband and I tune for high tens on boost up to 1 BAR (~14 psi) on twins, anymore boost then that you will need WI

[RobEVo5]

unless you put a wideband on it you cannot be sure if its running Rich, I would advise against taking fuel out using the commander as you will end up with a lumpy fuel map, you need someone with a datalogit and wideband so you can log proper values against the cells.

I would only advise mid 11\'s afrs on high boost if you are running water injection, high 10\'s is safer as you have a safety margin against a bad tank of fuel or high intake air temps. Trust me I have learned the hard way.

I tune my car with a datalogit and wideband and I tune for high tens on boost up to 1 BAR (~14 psi) on twins, anymore boost then that you will need WI

Thanks - Just ordered myself  LC-1 wideband, and have laptop. So will do some real time logs and see whats going on, and may get brave and try changing on handcontroller to lean out if its super rich as I suspect.

The logwork2 software looks ideal for a novice mapper, and someone that can\'t really be looking at a dash mount display and driving hard as the same time. The ability to log and save a run is great, and should see very quickly whats going on.

I come from a very modified subaru running apexi, so know a little about mapping on handcontroller and know someone thats maps subaru\'s for a part time living who is willing to map my REX, but will see how I get on myself first. For this side of things is half the fun of owning the car. You only learn by trying and asking, just need to be careful I don\'t get two carried away though.

[RobEVo5]

unless you put a wideband on it you cannot be sure if its running Rich, I would advise against taking fuel out using the commander as you will end up with a lumpy fuel map, you need someone with a datalogit and wideband so you can log proper values against the cells.

I would only advise mid 11\'s afrs on high boost if you are running water injection, high 10\'s is safer as you have a safety margin against a bad tank of fuel or high intake air temps. Trust me I have learned the hard way.

I tune my car with a datalogit and wideband and I tune for high tens on boost up to 1 BAR (~14 psi) on twins, anymore boost then that you will need WI

Here what you say on full boost and will take your advice. Would you say 12 up to 6 psi about right ?

thx
Rob

[BlitzBoy]

yes up to 12 afr on 6psi

Also look at your injector duty as well if you going to increase boost as this is the easiest way to pop an engine past 85% duty you are playing russian roulette.
I would urge you to buy a datalogit to map the apexi properly though because then you will be able to see what actual cells you are hitting on the map using the ghost map tracer

[RobEVo5]

Thanks again Blitzboy - Datalogit defo on the list to get.

Just want to see what fueling is doing first, and then go from there. 85% inj Duty is interesting and worth knowing, I know the scooby boys were and are running in the 90\'s on the injector duty and seem to be getting away with it. I was only running 65% at the time, but then I did have 740\'cc V\'s the tiny original 380cc\'s.

I guess the rex has the potential of greater spikes due to atmospherics etc, and in danger of spiking 100%+ which as you say ain\'t good.

Will post under seperate cover unless you can answer this one ?. Is there a definative answer to what is acceptable knock. Have read various threads and heard 60 is acceptable, again using the Scoobs as a comparison 30 on a scoob was considered to be in very dangerous territory. Whats your thoughts ?

I am seeing knock counts of around 14 on just cruising around, very wary of booting it at the moment, so have not looked on full chat and probably won\'t until I have the wideband in place.

[BlitzBoy]

The knock readings all depend on the state of the sensor, some really modified Fds have the sensor disabled , a noisy car can give false readings. with a proper working sensor up to 70 is safe and normal, anything past this is very dangerous. But i have seen soem seriously noisey and stiff suspension Fds given knock readings in excess of 100 with no ill effects.

So my advice here is do not use the knock sensor as tuning tool on a rotary just as a warning device.
Wideband and EGTs tuning is the way forward

[Scott.T]

Wideband and EGTs tuning is the way forward

What !!! and no Detcans ??
IMHO you need to calibrate the Knock output with a set of Detcans i.e when you start to here a tinkle on the detcans, thats what you use as your knock limit/danger threshold.