EDM S14a SR20DET>SR20DE conversion

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jj205mi
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Joined: Tue Aug 23, 2016 1:20 am

EDM S14a SR20DET>SR20DE conversion

Postby jj205mi » Mon Oct 02, 2017 8:12 am

Hi all, i have a UK s14a originally fitted with a SR20DET and i have (as a temporary measure) fitted an S15 sr20de. i am using the loom and CAS/coil packs from the s14a as well as the ECU with my Nistune fitted.

What map should i use? i could only find a s14 sr20de map in the software and it does'nt seem compatible as i get an error message when i try to upload it. (im guessing due to different board type)

i am a complete Novice and this was my first attempt to use the software today, so any advice is welcome. i assumed it would run on a sr20det map if i resized the injectors, it smelled very rich, but i found the plugs to be very knackered so im putting that down to why it didn't run. ill replace the plugs anyway. as i say this is only a temporary measure, but hoping it will learn me a bit about the software.

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Re: EDM S14a SR20DET>SR20DE conversion

Postby Matt » Mon Oct 02, 2017 10:45 am

You cannot simply take a file from one type of ECU and load it into another.... as you found out

You would need to open two copies of Nistune (one with S14 SR20DE maps, and other with S14A SR20DET connected to ECU). Then copy maps manually from one to the other

Things like K constant need manual adjustment, and cannot be copied

jj205mi
Posts: 8
Joined: Tue Aug 23, 2016 1:20 am

Re: EDM S14a SR20DET>SR20DE conversion

Postby jj205mi » Mon Oct 02, 2017 10:39 pm

Thanks Matt, yeah I learned the hard way as usual.

So what's the best way to do that? Can I select the whole map and copy / paste it or is it cell by cell. Anything else I should look out for while doing this?

Sorry for the basic questions , you must get fed up answering the same stuff all the time.

jj205mi
Posts: 8
Joined: Tue Aug 23, 2016 1:20 am

Re: EDM S14a SR20DET>SR20DE conversion

Postby jj205mi » Wed Oct 04, 2017 9:20 am

im going to change the injectors to the 370cc DET ones so the car should start and idle on the SR20DET map yes? then all i'd need to do is adjust the fuelling and timing map to fine tune i guess?

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Re: EDM S14a SR20DET>SR20DE conversion

Postby Matt » Wed Oct 04, 2017 4:41 pm

Do the operations > resize injectors for the change

With the maps select all (CTRL-A) and then copy (CTRL-C) and paste into the other Nistune

jj205mi
Posts: 8
Joined: Tue Aug 23, 2016 1:20 am

Re: EDM S14a SR20DET>SR20DE conversion

Postby jj205mi » Mon Nov 26, 2018 10:31 am

Got the car running at the weekend, I fitted a turbo to the DE, also fitted an HPX maf which has maxed out the k constant I guess because of the injectors and afm combination.

Still only have the de injectors I’ll fit the 370cc ones this weekend and see how it goes from there.

Just an update as it seems a bit quiet on here.

No problems as of yet

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Re: EDM S14a SR20DET>SR20DE conversion

Postby Matt » Tue Nov 27, 2018 11:48 am

which has maxed out the k constant I guess because of the injectors and afm combination.


HPX has a huge amount of airflow measuring potential, but you will probably end up scaling back your K constant based on what load the engine actually does.

When you do your dyno pulls and see how far the cursor goes on the load (TP) scale, you may end up pulling K constant lower so it doesn't run up the edge. When you pull K lower, then offset TIM (higher) to put the fueling back in


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