OBD 2 to 1 conversion harness... Pro's and con's Feedback wanted!

[2s4k0y09]

Hey guys, I searched and search, came across a couple threads going into a little bit of detail about the conversion harness to run an OBD 1 ecu in my 97' S14. I know mostly how I want to set up my turbo kit, but I'm trying to reassure myself that i'll have a rock solid tune of the ecu ( I love my car too much to skimp on any part of this to avoid blowing it up). I keep hearing good things about whether it be JWT, or other companies who do ECU tunes to obtain the proper AFR's and timing retard under boost condtions, expect it's all for obd1 240's.

Original plan: -Dtec FC w/ knock sensor... - BTM for timing - Wideband O2 sensor regardless of set-up

Goals: HP= 280whp- 330whp TQ= 300wtq Redline= 7200rpm Full boost by 3200-3500 rpm

This is going on a stock motor which I've babied and taken very good care of over the past 7 years I've owned her, right at 97k on the motor, good compression.

These are my supporting mods I wanna go with: -550cc top feed injectors w/ project silvia rail, SSbraided lines to hardlines -Walbro fuel pump -Z32 MAF - Colder plugs - Nology hot wires ( Already installed) - MSD blaster coil - RH manifold TM -Tial wastegate w/ atmosphere dump -Turbo XS BOV - Intercooler and all other piping - Rotomaster T3/T4 .60 a/r comp/ 1.00 a/r tubine (don't have trim specs) *I might be switching to a T3, but I'd like to run my current turbo with low boost for now, around 8psi to 10psi till I build my other block and head up. - Vacuum block - gauges and such that are required.

I'm learning from all you guys what to do and not to do, this is my first turbo project, but I have too many hours to list in research and time under the hood, there is just so much out there in the way of tunning options. I've look at other guys set-up that are compareable, but I haven't found anyone with the exact set-up as mine, which I'm not really suprised by.

New plan: (not dead set on a way yet) - Tunned ECU to what I'm looking at installing ( injectors and MAF and goals) -OBD2 to 1 conversion harnessReally don't want to go the way of AEM EMS due to the fact that emissions will be an issue in another 2 years. *or*I've heard talk of AEM having a new piggyback controller that does fuel and timing, but no set date on when they will have a harness for 240's. Don't wanna wait around for that, but still holding as an option.

So in all this jumble I just typed, my main question is for you 96' and up S14er's who run this kind of set-up and your experiences with it good or bad. I've heard you can re-pin obd1's into my existing ecu, but I'd rather not do that. Any feedback is welcome, and I feel like I left something out of my set-up I described above, but regardless I'd like to see what you guys have to say, Thanks in advance!

[WDRacing]

Never heard of anyone switching to OBD1...

[2s4k0y09]

Yeah here is a link to the website I found http://rywire.com/store/nissan...b3d7f

I'm not sure if it's really popular with the S14 crowd, but I'm really thining of going this way to get a good solid tune.

Any feedback on this would be quite helpful to me and I'm sure other S14 owners.

WD: You wouldn't have to worry about it because your obviously OBD1 already.... Lucky you...lol

[S13FX]

Actually, I think since your willing to put so much work into your car, and are willing to do a obd1 conversion.

Instead of doing that why not just make a Harness for a Mega Squirt and run that?

[WDRacing]

WD: You wouldn't have to worry about it because your obviously OBD1 already.... Lucky you...lol

Some 95 S14's were made OBDII, but not mine baby.

[jdm_master_X]

OBD II has more emission mapping within the ECU, thus increasing the chances of throwing DTCs during operation.

going to OBD I for performance reasons...i love it. pretty popular amongst honda owners.

[WDRacing]

Your user title just made me piss myself. Well done

[jdm_master_X]

no problem! i'll be here all night ladies and gentlemen.

[S13FX]

I still say just do a Mega Squirt setup and your set.

[2s4k0y09]

S13FX- Do you currently run the Megasquirt set-up? I've done some reading on that set-up, pretty much full standalone, but for half the price.

JDM Master- Yeah I had a friend do that before on his Honda, trying to get around all this emissions and an ECU that's hard to crack is a PITA!...lol

[480sx]

Megasquirt is scary, lots of downtime. Im in the process of building a track s14 and am moving my MS ECU over to my track car instead of my daily. Just getting sick of the start up issues i keep having. (oh and not being able to drive my baby![as a daily driver,lol])

I have been messing with MS for the last three months with good, and bad results. I made a few mistakes, and lost a good tune that i had(saved over it, @#$%). Since then havnt been able to get back to that point. At my best point, i had the car starting up with ease, and reving with good AFR's all the way out to redline. Still, getting to that good tune phase took a crap load of work. Im not saying dont use MS, but if this is your first experience into tuning/turbocharging your car, i would skip it. Im going with a Enthalpy ECU on my daily, and MS on my track car.

[B-Boy DuB-L]

yea if you dont know how to tune for air/fuel mix you can mess up your engine pretty bad. i've heard of people just killing their engine cuz they didnt know how to work megasquirt.but yea i say skip it get a jwt or enthalpy

[2s4k0y09]

I have knowledge on tunning, but MegaSquirt sounds pretty involved. I'm going to go the way of the OBD 2 to 1 conversion, find an ecu someone is selling that matches the perimeters I'm looking for, and the good old wideband for proper tunning along with maybe a SAFC2 for fine adjustments.

I apperciate all your imput guys. If anyone wants to add anymore experiences please post them up.

[neverlift]

stanza ecu////////////////////

seriously though, step way down. IF you can tune yourself do it. I went to it after a couple weeks on stock de ecu. I know its sounds stupid, but all you need to do is slot or reclock your dizzy wire in a sohc maf and set teh feedback control to the de numbers(I cant remember atm). I'm now over 400 miles into my kat setup with said ecu setup. gets good mileage and performance is there....

its by FAR the cheapest solution to tuning a de motor.

[theimbalance1]

I have a 97 and I am running an EFI specialist ECU with the conversion harness. It works great. I would suggest some sort of basic fuel computer to tweak it just right though. A knock light wouldn't hurt either. I have a holset hy35w, 550s, and z32 mafs.

[2s4k0y09]

theimbalance1- How much did the EFI Specialist ECU Tune run you? My turbo is similar to size that your running, along with the injectors and MAF I'll be using. I also plan on using a SAFC2 for fine fuel tunning regardless of the tunning solution I use. The conversion harness is just a plug in type deal from one ecu to the other one correct?

neverlift- Stanza ECU... I've seen one guy running a tuned one of these on his N/A KADE. What's all involved in tuning that ECU? Are you adding chips to it to tune it or? Sounds like an idea to consider as well, just need more info on it.

Thanks to you both...

[480sx]

For some reason the link you posted for that websight is broken, wont load the page.

How much does the conversion harness cost? Enthalpy sells one for 100 bucks. Or, if you are DIY minded, you could get a set of wiring diagrams, one for a s13 and one for a obd2 s14 and rewire the ECU plug. Its been done before, and would be the cheapest way for you to go about doing that.

[2s4k0y09]

The conversion harness from the link costs $250 + shipping. I'll have to check out the one from Enthalpy. I could make my own harness, but I'd rather pay the money to have reinsurance that it's all wired correct... Don't wanna get it in and find I f**ked something up, ya know...

[neverlift]

well IDK about s14 harness but the s13 de harness is close enough I didnt have to cut anything, but I'm running no emission devices(that includes scv and fprs). I had to slot my dizzy way out(gabe said I could clock that bish but I didnt have any luck) to get a timing value that was usable(50 wasnt it lol) I 15'd out the timing map(s) and adjsuted the dizzy till it stayed at 15 with revs. Before that I figured the "feedback controll" needed to be adjusted, changed it from sohc value to dohc value and the car fired right up. Tuning isnt the simplest task with it, but IF your a diyer its possible. I've been on it for months before boost and now with boost. Also its by far the least expensive way to tune, even if you buy an emulator to tuen on a laptop in realtime. It will require on zif and one sst27sf512, and an eghey willem burner. **** thats not very english like but you get it . (if you have the cash for s13 step down do it, stanza ecu is very involved...)