KA24DE DIYPNP

[KRT312]

Hello. I am helping my brother with his 1990 240SX and we have done the following:

Swapped the KA24E with a KA24DE from a 1993 240SX that had a recent rebuild with rings gapped for turbo

Bought and assembled this kit https://www.diyautotune.com/product/diy ... mbled-kit/

Installed this trigger wheel https://www.diyautotune.com/product/50- ... or-ka24de/

Followed this guide to get it set up with COP ignition and like other people posted in the thread I did swap power and ECU signal as his diagram is labeled incorrectly. http://www.ka-t.org/forums/viewtopic.php?f=2&t=60105

Installed this turbo kit http://www.enjukuracing.com/products/is ... 91-98.html

Using these injectors http://www.deatschwerks.com/products/fu ... ors-detail

Distributor was installed with cylinder 1 at TDC compression stroke.

Distributor rotor points toward where the spark plug cable would be for cylinder 1.

These two items will arrive this Friday/Saturday and I will install them on Sunday. https://www.diyautotune.com/product/msp ... inum-bung/ https://www.summitracing.com/parts/avm-30-4110




What I would like is to be pointed towards the best/right base map to use. I have installed the 3.4.2 firmware to the DIYPNP and only saw a base map on the diyautotune website for the 89-90 KA24E and one for the 95-98 KA24DE.

I would greatly appreciate any help and if there is any additional information needed let me know and I will do my best to provide it.

I also apologize in advance since this is probably something really simple but electronics have always been my weak point and I think I got in a little over my head.

Since I've been working on the car all day so I might go to bed before anyone responds but I will respond as soon as I can.

[CRSTune]

I'd start with the S14 map and customize your settings as necessary for your specific application.

[KRT312]

Tried with the S14 base map using the settings found under wasted spark here https://www.diyautotune.com/support/tec ... gger-disc/ also input the correct injector size.

The engine will crank but will not start.

Would initially backfire every now and then, tested spark with tuner studio realized I wired spark A to B and B to A reversed them and now it cranks without backfiring but still no start.

We are getting spark, fuel, about 160ish psi across all cylinders, tuner studio will read around 130ish rpm while cranking with a freshly charged battery and drops to 70ish as the battery drains.

I have been and will be a bit busy due to work and school until Sunday so on that day I will reload a fresh base map and redo all the settings to make sure I didn't skip something.

[CRSTune]

Please post the calibration you're using if you don't mind.

[KRT312]

Well ended up being pretty busy today too and didn't get a chance to install the wideband or the IAT kit.

Dropped in a freshly charged battery loaded up the S14 base map and redid the ignition settings then tried to start it but the car would give a few weak cranks and stop.

Checked battery connections and noticed the ground cable didn't seem to be as stiff as it should be for its gauge and realized we forgot to tighten the bolt on the ground cable to the chassis.

Tightened it up and the car fired right up and shut off after a second or two. Also noticed that cranking rpm now starts off around 150ish and jumps up to 250+ and car fires up.

If I step on the gas the car keeps running and sometimes will idle for a few seconds before shutting off after I get off the pedal.

Another thing I noticed was that in tuner studio the running rpm isn't the same as what the cluster displays.

When I step on the gas and try to keep it around 1500 rpm by looking at the cluster, forgot to mention I bought a cluster from a 1994 240SX so rpms would display, it will read at 2500+ in tuner studio.

Included my current settings and a log of the last time I started it and gave it some gas to try to keep it running for a short time.

[CRSTune]

-Is there a particular reason the tune is set to run Alpha-N? All of the S14 KA base calibrations are speed density. Where did you get this file?
-Looking at a datalog without AFR can only tell you so much. You need the wideband installed to tune/troubleshoot.
-You need the IAT sensor installed.
-At the duty cycle the idle valve is running at, it should have absolutely no problems idling. I don't think I've ever had my idle valve that high in duty. Without AFR, it's hard to tell but I'd be willing to bet the fueling is off causing it to stall.
-The ignition dwell is too high for Maxima ignition coils. They'll get really hot and possibly burn up if left at that setting.
-I'd be more inclined to believe the RPM in tunerstudio than your tach. The DOHC tach gets its signal from the ECU, however you don't have the tach output enabled in the calibration. This leads me to believe you're getting the signal from somewhere else, hence why it's likely off.

Please post a log once you at least have AFR working.

[KRT312]

-Is there a particular reason the tune is set to run Alpha-N? All of the S14 KA base calibrations are speed density. Where did you get this file?
-Looking at a datalog without AFR can only tell you so much. You need the wideband installed to tune/troubleshoot.
-You need the IAT sensor installed.
-At the duty cycle the idle valve is running at, it should have absolutely no problems idling. I don't think I've ever had my idle valve that high in duty. Without AFR, it's hard to tell but I'd be willing to bet the fueling is off causing it to stall.
-The ignition dwell is too high for Maxima ignition coils. They'll get really hot and possibly burn up if left at that setting.
-I'd be more inclined to believe the RPM in tunerstudio than your tach. The DOHC tach gets its signal from the ECU, however you don't have the tach output enabled in the calibration. This leads me to believe you're getting the signal from somewhere else, hence why it's likely off.

Please post a log once you at least have AFR working.

Thanks for all the help. Unfortunately with my schedule I can't really do much until Wednesday. I will do my best to have everything you listed done by then.

I got the map file I used from here: https://www.diyautotune.com/wp-content/ ... a24-mt.zip

[CRSTune]

That file doesn't match the firmware of the tune you uploaded. I take it you updated the firmware and then converted?

I'd suggest starting from here:
http://www.megasquirtpnp.com/mspnp2_maps.php
There are 4 maps available for the S14 KA24DE, 2 of which are for the stock trigger wheel and the other 2 are DIY's 12-1 wheel. All 4 are speed density. Downgrade to firmware comms330NP and get it running (doesn't have to be perfect) before you update to the latest firmware.

[KRT312]

Installed the wideband and IAT. Lost the exhaust gasket that goes between the test pipe and downpipe so there's most likely an exhaust leak there. I'll order a replacement asap.

Pretty sure I got the settings in tuner studio correct this time and the following happened:

First time car started up shut off after a couple of seconds. Second time gave it a little gas for a few seconds and after let off the gas pedal it stayed idling in the 1300-1500 rpm range.
Shut it off to open the garage door and the third time I started the car it idled on its own without having to give it any gas. I took a log of it while it was running but shut it off before it could reach operating temp because I saw smoke.
It was just oil and grease residue burning off the exhaust manifold from when we were installing the engine and then I had to take off to go help a friend with his car so I wont get to work on it again until the weekend.

Here's the base map I'm using to get it started and the log I took.

[CRSTune]

What kind of wideband are you using? I'm having a hard time believing the logs since it's pegged out at 14.8 AFR most of the time with brief spikes lean. You're going to want to check to make sure you have it calibrated correctly.

[KRT312]

What kind of wideband are you using? I'm having a hard time believing the logs since it's pegged out at 14.8 AFR most of the time with brief spikes lean. You're going to want to check to make sure you have it calibrated correctly.

https://www.summitracing.com/parts/avm-30-4110 that's the wideband im using.

Just got around to letting it get up to operating temp for the first time, car is at my brothers place and with my schedule its kinda hard to go over to work on it. After it warmed up rpms only dropped down to about 1200-1250 rpm.

The first time I started the car with the AEM wideband the physical gauge would read about 14.3-15.8afr at idle and spiked to 17afr a few times. I guess for some reason TS only picked up the signal when it hit 17afr?

Double checked my wideband wiring and it seems to be good. Getting 12v and ground from MS and have the signal wire hooked up to where the O2 signal would go.

Tried selecting both AEM options in TS and manually inputting the parameters but now it just doesn't read afr at all in TS, pegged at 10afr now, the physical gauge still seems to be reading the afr correctly.

When I rev the car to about 2k rpm afr will read at about 13.2-14.2 and when I revved it up to 3.5k-4k it would read in the 11.8-12.8 range. Got it up to 5k once and afr read at 10.8-11.8.

Will try to get it to idle around 750ish rpm before I take it out for a drive or mess around with any tuning. I'll post a log as soon as I figure out why TS doesn't seem to be getting a signal.

Like I mentioned before this is all new to me and I seem to be getting ahead of myself and skipping some steps listed in the setting up MS pdf file.


Edit: OK, got fixed the issue with afr only displaying on the gauge and not TS, another grounding issue.

Here is a log after I let the car warm up. TS seems to be reading about .2-.4 leaner than what the actual gauge does.

Car seems to be idling a little higher today than the other day. Held rpm at about 2k for 10 seconds, 3k for 10 seconds, and 4k for a few seconds while looking at the cluster. TS reads a little different.

Next weekend I'll work on it a little more and hopefully finally have it ready to take it out for a test drive and try out VE Analyze.

If someone more knowledgeable can take a look at the log and point out anything that looks out of place I would appreciate it. Thanks.

Had to zip the file since it was over the 1MB limit.

[rickb794]

Double checked my wideband wiring and it seems to be good. Getting 12v and ground from MS and have the signal wire hooked up to where the O2 signal would go.

You should not power the O2 from the MS. It should not be powered if the motor is not running, most power the O2 from the fuel pump.

The O2 heater should also be grounded to the motor so any noise produced by the O2 controller is kept away from the MS. Some O2 controllers have a separate signal return that can be connected to the MS.

[KRT312]

You should not power the O2 from the MS. It should not be powered if the motor is not running, most power the O2 from the fuel pump.

The O2 heater should also be grounded to the motor so any noise produced by the O2 controller is kept away from the MS. Some O2 controllers have a separate signal return that can be connected to the MS.

My original plan was to wire up a relay directly to the battery and be activated by the fuel pump to power the wideband and use the cylinder head for ground but I found a few posts where people would wire the MS DB15 connector to 12v, ground, sensor ground, and O2 and use those connections.

Seemed more convenient so I went with it but I am getting about a .2-.4 leaner reading in TS and I did read some posts that mentioned that not grounding it correctly might cause it to display a different reading so I think I'll go back to that idea and see if I get more accurate readings.