Got a 240sx with sr20det engine for $500 - Page 3 - Nissan 240SX Forums
New Member Introductions **240SX 101. NO FLAMING ALLOWED**

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post #51 of 99 Old 04-23-2018, 11:32 AM Thread Starter
 
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Replaced all the lug nuts, raised up about an inch all the way around and got the fender mounted. Pop ups need some adjusting.



Still rides pretty rough and looks like the bushings might be shot on the bottom rear of the stance shocks. Might raise it another 1/2" and see if I can soften up the damping a little more. I'm not a fan of black rims, so I'll be doing something about that here soon. It idles at 2000rpm when its cold, and it takes forever to warm up. I'm assuming it doesn't have a thermostat and my fans kick on when it's barely warmed up, I have a higher temp thermoswitch to put in.

Sold a few things over the weekend and will be getting a nismotronic and wideband in the next month. Then probably get an LSD because this 1 tire fryer, peg leg shit is no fun.
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post #52 of 99 Old 05-02-2018, 01:55 AM Thread Starter
 
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ECU out for Nismotronic install (damn shipping!) and AEM WB getting installed soon. Any concerns running a WB in the stock location? Considering a heat shield/sink?

Going to do some more shock adjustments, add some grounding and a few other cleanup/fixes. My gopro broke, but I'll get some vids up soon..

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post #53 of 99 Old 05-07-2018, 11:21 AM Thread Starter
 
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Found a few issues yesterday.

The O2 Sensor wire has a wire that broke off. Surprised it passed emissions like that. It's being replaced by the wideband here soon anyhow.



This ground braid from the head to the firewall wasn't hooked up which might explain some the missing and cutting out. I'll probably add a few more grounds for good measure.



Still waiting for the ECU to be shipped back, but I've been reading the users guide in the meantime, lots of cool features and logging capabilities.
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post #54 of 99 Old 05-18-2018, 05:04 PM Thread Starter
 
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Got the Nismotronic and wow, there's a lot there. Was having troubles with the ECU after installing only to realize I hadn't tightened the ECU harness all the way in. Dumb. Car is running pretty solid now even w/o the stock 02 sensor but I'll be installing the WB this weekend, most likely, and I can use that for closed loop operation. The temp gauge on the cluster seems to read a little low compared to the ECU, might try 1 step higher temp (200-190) for the switch or wire the fan relay into the ECU (not sure how that works but I think it's possible). I need to find me a boost controller to crank it up to around 12psi on the stocker and see what it'll do. Going to rig up a camera mount and then start running some logs along with some video.

I set the rear coil overs up nearly the same but for some reason the drivers side sits about 3/4-1" lower? Suspension looks good, not bent or anything so I'm not sure why. Wish I had some corner scales handy.

Once I'm happy with the tune and everything else, I'll convert it to a MAP based tune and ditch the MAF, and once I'm happy with that, upgrade the turbo, injectors, and fuel pump, then I'll take it to the dyno (probably next year).

Lots to do and clean up still but it's going pretty good and I'm pretty happy with it at the moment. I'll be daily driving it for the summer and might try to get it out to Portland International Raceway(PIR) and do a little drag racing eventually.

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post #55 of 99 Old 05-24-2018, 10:52 AM Thread Starter
 
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Still don't have the damn O2 sensor installed. It's got a skinny O2 sensor and the WB is a fat O2 sensor and I couldn't get the damn adapter out, not enough room to get torque on it. I've started poking into the Nismotronic and setup the launch control which is pretty neat, but with an open diff I can't set it too high anyway. I tried to setup the flat shift but realized I forgot to check a box and shifted around 7k. Didn't break anything. I'm learning though, but don't want to make too many changes w/o knowing all the effects, so I'll proceed cautiously and take it step by step.





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post #56 of 99 Old 06-01-2018, 12:34 PM Thread Starter
 
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So, I got out the skinny O2 sensor adapter, but it was larger than the WBO2 sensor, so I drilled and tapped the damn thing to fit the WBO2 sensor. I got the cable routed and pulled, but didn't quite finish wiring it up because my kids wanted to play hide and seek. I got a cheap 3d printed center vent gauge holder for $13 bux off ebay, I sanded it down and painted it because it looked like shit.

I did get my door holder thing fixed, it was completely busted. Sometimes, it's the small things..

From Japan to my door for $47.

Busted.


Fixed.


I'll get a few more pictures of the WB install when I finish it up on Sunday. Also trying to figure out how to use the ecu to control the fans, and how to hook up a boost solenoid and use the ecu to control boost. Later this summer I'll get an AIT and MAP sensor installed.

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post #57 of 99 Old 06-07-2018, 02:53 PM Thread Starter
 
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Figured out how to wire the fans up to the ECU and will be wiring that up in the next few weeks. I also figured out how to view the maps in 3d and did some smoothing and other adjustments.


I came up with an interesting idea. Instead of running an actual map sensor, I can run an AEM boost gauge (-1bar to 2.5bar) that has a 0-5V analog output and use that as the map sensor. And that means I will be able to log and control boost (already got the MAC boost control solenoid) through the ecu. And all I would need is an IAT sensor and I could convert over to a MAP based tune and ditch the MAF. I think it will work...
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post #58 of 99 Old 06-13-2018, 11:04 AM Thread Starter
 
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My new AEM WBO2 gauge just randomly stopped working. Now it just reads full lean. Tried Free air test, failed twice, then passed, tried moving the ground wire, tried wiring it straight to the battery per the tech guy's recommendation. No luck. Now I've got to send it to AEM. Really pissed me off, but I suppose it'll give me time to fix and wire up a few things/issues.
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post #59 of 99 Old 06-14-2018, 01:00 AM
 
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I've been using an older PLX m400 wideband, hasn't failed me. Wish the display was OLED because it's hard to read in the daylight. Hopefully your gauge is fixed this time around.
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post #60 of 99 Old 06-20-2018, 12:48 AM Thread Starter
 
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I had a PLX on my Rx7 and didn't have a problem with it ever, well 2-3 years or so. In an effort to have this back up asap I decided I'd buy another sensor and, what do you know, it's working again. Maybe it was a bum sensor, maybe it was cause I didn't let it warm up all the way once, maybe it was because it's too close to the turbo.. IDK. This one does seem to be reacting faster?? who knows. I did get it mounted this time and will probably fill up those other gauge holes with some more AEM things and crank up the boost soon.

I did get a new GoPro for Father's Day so I'll be getting some good videos here soon. Not boring shit like this - v - (shot with my cellphone)


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post #61 of 99 Old 06-28-2018, 01:14 AM
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You could use the IAT in the MAF as signal to test if using the AEM as a MAP Sensor would work.


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post #62 of 99 Old 07-10-2018, 08:43 PM Thread Starter
 
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Well, I've been trouble shooting a strange issue where in the warm/hot afternoon it runs really lean but in the mornings it runs pretty rich/good. Like AFRs 13-15 in the AM and like 14-19 in the PM (at times it wants to stall at like 18-19 AFR). I've gone through and reviewed logs and made some tweaks but I can't seem to find anything that would change how it runs based on outside or intake air temp. Engine coolant temp is consistent in the morning and afternoon and in any case the air is less dense when it warms up so it should just run richer in the warmer temps. IAT is defaulted to 68f all the time.

It's going to be really hot this week (really hot is 94f) so I'm going to try and park it tomorrow then fire it up 'cold' in the afternoon and see how it runs from the get go. I have a hunch that it could be weak wiring to the fuel pump and it's not building enough pressure (from my research?). Fuel filter is brand new. Pump is unknown. Yea, I could test the pressure, but I might as well just get a walbro if it seems that's the problem.

If you guys have any other ideas I'd be glad to hear them.

Scoot, Thanks for the idea but I don't have a MAF with an IAT. I'm using a stinking KA single cam MAF.

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post #63 of 99 Old 07-13-2018, 12:35 AM Thread Starter
 
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Didn't run too bad in 94f temps coming from a cold start.. So I'm not sure exactly. something getting heat soaked or some shit. Walbro, IAT sensor, on order, just need the MAP sensor. Soon.
Sorry, testing gopro locations, this was underhung from the sunroof.

Jumped into Lake 0 today.. LoL.
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post #64 of 99 Old 07-21-2018, 05:16 AM Thread Starter
 
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Ok. It already has a walbro. I rewired in a relay to the pump and no luck figuring out whats up with the high AFRs. It happened again, after getting the underhood temps up, but, when I left the hood open the issue seemed to go away. ?? I don't know?

Going to PIR for late night drags tomorrow. We'll see what happens. Maybe, low-mid 15s. Test and tune I suppose..
https://youtu.be/XpuITbmEPTo

Got the headlights fixed, so, that's a plus.

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post #65 of 99 Old 07-22-2018, 01:22 AM Thread Starter
 
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Well, I still had some lean issues and probably some sweet detonation, but here's my best run of 14.3 at 97.

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post #66 of 99 Old 08-21-2018, 09:21 PM Thread Starter
 
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Well, it has been a busy summer! Haven't been driving the shitbox too much as I was waiting on the pressure regulator, but it doesn't seem to have helped.

I'm still fighting this damn lean issue. Runs awesome in the cool mornings, runs like absolute crap in the hot afternoons. Rewired the Fuel pump to a relay. Replaced the FPR. Something is getting hot and not working right. I took it for a cruise after putting in the FPR and it ran great, just when it gets 'heat soaked'.

EDIT: scratch all that shit. It must be the MAF? Brand new KA24E unit. Voltage at Idle in the morning is ~1.6V, in the afternoon when it runs lean it's ~1.4V. Going to do some testing tomorrow... Dammit. Pretty sure someone suggested MAF above.. the heat must fuck with it just enough to cause the misread.

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post #67 of 99 Old 08-27-2018, 11:01 AM Thread Starter
 
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After some research, I decided I am just going to a speed density based tune and am going to ditch the MAF. Just need to get the IAT bung welded up this week/weekend and drill and tap the intake mani for the MAP sensor. You're not supposed to use the Boost Sensor(PSIg) as a MAP sensor(PSIa), FYI. https://www.aemelectronics.com/?q=pr...essure-sensors Although the specs look very similar between the Brass PSIa and SS PSIa sensor..

I'll also be installing the MAC boost solenoid to control boost through the ECU.

Need to do some more research and attempt to calculate VE, but that'll probably come with time and 'tuning'.

Edit Update: Ordered new 'ebay' exhaust, just something with a muffler that's not 'ricey'. Ordered new temp sensor for gauge cluster. Getting the IAT bung and a radiator temp sensor bung welded up soon. MAP sensor will just use a short vacuum line to the TB. Wiring still todo and maybe a compression test.

Body & Paint, wheels, brakes, hubs, suspension, LSD, turbo, and injectors, being considered. Cleaning/Prepping garage for work this winter.

Edit: Bungs welded




Edit: 9-16-18

Wiring up the IAT and the MAP sensor.


Cleaned up.


Tuning so far has turned out to be, well, not simple or easy, once I get it happy, I'll make some videos. Another note, is do not mount the MAC boost solenoid directly to the chassis, it's super noisy, clickity clickity, needs a rubber isolator or something..
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post #68 of 99 Old 10-08-2018, 11:21 AM Thread Starter
 
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Tuning has been coming along albeit a little bit slower than anticipated, but it's getting closer. Idle, lower RPM, midrange, and low boost AFR's are solid.

However, I kept having this problem at WOT where it was just cutting out and reading lean but I could see inj. pulse width rising. I knew it was getting fuel but just not enough spark. Tried some BKR6E plugs gapped at .028, no luck, and after some research I ordered 4 brand spanking new OEM coils (they came from Olympia Nissan and were packaged like a Hickory Farms gift box) and ditched the cheap knockoffs (maybe ISR?) and it fucking finally, cleared up! Now I can actually go WOT through the rpm range, however the rain makes it mostly impossible to safely do pulls, but there's some good weather coming this week and weekend and I'm going to get out and rip it up and finally get the WOT part of the map dialed in!

I've done some research, but what do you think the Stock t25 turbo max boost is? 10-12psi?
I'm considering a GTX2863R but might go with GTX2867R, want a reliable 350whp or so. I put one in my 'shopping cart', but didn't pull the trigger, LoL. Needs fucking brakes and a lsd before a bigger turbo really.. Christmas is right around the corner though..


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post #69 of 99 Old 10-17-2018, 12:50 PM Thread Starter
 
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I like this look better. Now I just need to spend 5 hrs stripping the paint from the rims on the other side. Might add a little spacer to push the wheels out a little.

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post #70 of 99 Old 10-17-2018, 01:14 PM
 
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When I had the t25 on my ka, I turned up the boost to around 12 and it feels like it hits a wall. 10 was a safe spot for boost. I was maxing out 370cc injectors at 12psi.

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post #71 of 99 Old 11-03-2018, 08:18 AM
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Woah I love this car. It's my dream car.
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post #72 of 99 Old 01-10-2019, 11:07 AM Thread Starter
 
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Good things are coming. Garrett GTX2863R 0.64 Turbine Housing. 740cc injectors on order. I will run this next summer, then get some cams and that'll be about all for the engine. Then focus on brakes, diff, suspension.



740s



A little playing around with the gopro, nothing too exciting.

https://youtu.be/vYEjRf3_0fs
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1990 240SX SR20DET

Last edited by Nick_240sx; 01-29-2019 at 10:04 AM.
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post #73 of 99 Old 01-20-2019, 04:01 PM
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How are you liking the Speed Density?
Glad you got those coils changed out. Wouldn't use anything cheap that is electronic like a sensor or part. Always causes dumb issues like that.

2863 is gonna make for a real fun car.


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post #74 of 99 Old 01-22-2019, 04:19 PM Thread Starter
 
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Speed density is working out pretty good. I keep fucking with it trying fix some minor nuances, like high idle during warm up and some weird high afr under very light acceleration in vacuum, but can't seem to get it quite right. Over all was running great on the stocker at 11psi.

Agree on the Electronics. I had to get genuine injectors this time because once I bought some cheapo ones for my RX7 on ebay, big mistake. Didn't flow right and inconsistent spray pattern, I ended up just throwing them in the trash and got some RCs.

Anyone got thoughts running 24psi on the 2863 with aux injection?

I will probably get out to the dyno next spring/summer just to get a professional opinion about my 'tune'.

Edit: got this bitch out tonight.


Edit 1-29-19
Ported wastegate and installed actuator.






1990 240SX SR20DET

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post #75 of 99 Old 03-08-2019, 09:25 AM Thread Starter
 
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Turbo is in and snug as a bug in a rug. Waiting on some 90 couplers.

A little comparison






I swooped this up off Zilvia for $650! Brand new tomei 2 way.





Hopefully up and running in the next 2 weeks..
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1990 240SX SR20DET

Last edited by Nick_240sx; 03-21-2019 at 01:31 PM.
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