Editing Forums/Z31P/z31-performance-upgrade-forums engine-management/Nistune K-Constant Thread

{{ForumImport
|op_user=Careless
|op_date=2010-12-18 06:23:45
|post_count=34
|archive_url=/Z31performance_archive/forum/z31-performance-upgrade-forums/engine-management/12898-nistune-k-constant-thread.html
}}

'''Careless:''' <small>(2010-12-18 06:23:45)</small>

'''Nistune/Injector K-Constant Reference Table:

'''M: make/model/colour/nickname

'''C: capacity cc (unless other unit of measurement specified)

'''F: base fuel pressure (assumed factory 30psi at 0 vac unless specified)

'''K: k-constant value (k)

'''L''': latency (us)

I''': impedance (high-z/low-z)

N''': notes (short mod list, other fuel components)

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M: Mazda

C: 460cc

F:

K: 390

L: 800

I:

N:

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M: R32 GTR Skyline

C: 440cc

F:

K: 343

L:

I:

N: stock FPR

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M: DSM (no colour specified)

C: 450cc

F:

K: 143

L: 770

I:

N: stock FPR, walbro fuel pump, cobra maf

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M: Mazda FC3S RX7 - ''Denso

C: 550cc

F: 37psi

K: 330

L: 750

I: Hi

N: mostly stock 88 tune, stock fpr/lines/maf/pump/turbo (at 14-15psi), 3" exhaust, stg1 schneider cams

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M: Ford Green Tops

C: 440cc

F: 37psi

K: 119

L: 57

I:

N: Ford Lightning maf, walbro pump, aeromotive fpr, 24* base timing.

--------------

Keep 'em coming…'''''

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'''MrFishHat:''' <small>(2010-12-18 07:17:14)</small>

On my 460cc mazda injectors Ive found 390 works pretty decently.

Running 800us of latency as well.

EDIT: They are also low imp, ~4ohm IIRC

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'''300zxturboftw:''' <small>(2010-12-18 07:32:34)</small>

I'll let you know the values of when the 680cc rx7's work when I get them up and running within the week.

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'''james:''' <small>(2010-12-18 10:41:18)</small>

R32 GTR skyline 440cc injectors seems to like 343 using the stock FPR

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'''Bernardd:''' <small>(2010-12-18 14:20:49)</small>

1

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'''shromy:''' <small>(2010-12-18 15:42:07)</small>

450cc dsm

k- 143 currently

latency- 770

stock FP with walbro and cobra maf.

Edited the latency.

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'''Careless:''' <small>(2010-12-18 18:02:10)</small>

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I understand. Even the stock fuel maps are programmed well enough to work in different climates and temperatures and whatnot- so it's anyone's guess. But as you can see- there are some people who have the data on hand, so putting it all in one place makes searching easier if the size-up percentage formula with new vs. old doesn't work out for someone. Not me being lazy, just me wondering.

lets keep this going?

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'''Careless:''' <small>(2010-12-18 18:05:05)</small>

it's amazing how the 440 and 460 injectors differ so much from your 450 settings, shromy.

for this reason- i think exploring other people's input is what makes this thread have at least a shred of value to some of us.

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'''shromy:''' <small>(2010-12-18 19:14:01)</small>

yeah totally different, almost the same k I used with my crappy old MB 420's. The car ran better with the 450's at the same k then the 420's. Course that was due to the one failed injector that cost me yet another piston.

Yes lets keep this going. Are bin files up-loadable?

Edit no they are not [archived image: frown.png].

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'''Careless:''' <small>(2010-12-18 20:05:40)</small>

so… does it need to be mentioned whether they are High-Z or Low-Z injectors?

no reason to upload bins- this is merely a starting point.

edit: do we also need to mention the "minimum pressure" required for the injectors listed?

I'm seeing a lot of them are 36psi minimum. infact- most of them are… how are they even running properly with our cars?

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'''shromy:''' <small>(2010-12-18 20:50:17)</small>

Hmm, never seen if the figures would change in an ohm difference since I have always used low ohm.

I dont think the min. pressure is that important. Since most users will be on stock fuel setup, maybe with an aftermarket pump. The other half simply wont know what it is.

I suppose both would not be a bad thing to add. I think you should setup a list in the OP so it can be found easier instead of searching 20 posts etc, IMHO.

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'''Taris Blue:''' <small>(2010-12-18 21:05:13)</small>

I'm running a mostly stock 88T tune with s5 fc3s rx7 550cc injectors (hi imp)…stock fpr and fuel lines…stage 1 schneider cams, full 3" exhaust, factory turbocharger at 14-15psi, 87T MAF, stock fuel pump

K = 330

lat. = 750

runs great!

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'''DMANN:''' <small>(2010-12-18 22:35:30)</small>

Ford green tops 440cc, ford lighting maf, walbro pump, aeromotive fpr, set 37psi at idle.

K-0119

latency-57

24' base timing

Runs and starts great!

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'''Careless:''' <small>(2010-12-19 02:23:13)</small>

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will do when i get home.

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'''michaelp:''' <small>(2010-12-19 02:51:01)</small>

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If anyone wants to share BIN files I will host them on my site and post them here, just e-mail me them.

Z31NA2T (at) rochester.rr.com

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'''Careless:''' <small>(2010-12-20 04:33:08)</small>

updated the first thread to include a list of injectors.

opted to avoid the whole horizontal tabbed look because missing data makes them harder to read.

any missing data will simply leave the row empty in this format.

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'''300zxturboftw:''' <small>(2010-12-20 05:39:44)</small>

For the latencies of these injectors, they are pretty much the same when the same manufacturer correct? As in the Rx7 injectors are all bosch, which I notice already that the latencies are closely similar. This is the only confusing part of tuning the injectors I still don't understand. This just tells it how long to open them correct?

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'''Careless:''' <small>(2010-12-20 05:47:34)</small>

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I wouldn't go by manufacturer when tuning the latency. Bosch makes many different kinds of injectors and the coils inside the injector body may be different and may require more or less adjustment- and I'm sure there will be one or two cases where you might even see the same injector have different latencies that work for either person using them.

I think this should only be used as a starting point- and the more data we have (even if there are two which are the same injector), the more people can try and not just shoot blindly at getting their injectors to be properly operated by the ECU.

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'''nismopu:''' <small>(2010-12-20 14:09:19)</small>

For most of these injectors it would be nice to know what the part numbers are from Bosch. Like what the hell are ford green tops?

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'''DeleriousZ:''' <small>(2010-12-20 15:51:38)</small>

[http://lmgtfy.com/?q=ford+green+tops&l=1 http://lmgtfy.com/?q=ford+green+tops&l=1]

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'''Taris Blue:''' <small>(2010-12-20 22:18:14)</small>

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Just FYI, my S5 550cc primaries are Denso injectors…not Bosch…they are the OEM mazda ones and they have the round/oval clips

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'''Careless:''' <small>(2010-12-20 22:21:26)</small>

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I will add a part number line as soon as they start rolling in.

Mods: thread cleanup- preeze?

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'''shromy:''' <small>(2010-12-20 22:32:45)</small>

I beleive I was seeing about 34 at idle with stock components. Edit mine to 34 psi, low ohm and blue top dsms. plzzz.

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'''nismopu:''' <small>(2010-12-20 23:30:40)</small>

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Understandable, I have seen people selling the TBI ones as the green top 42lb ers which are not the same.

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'''300zxturboftw:''' <small>(2010-12-21 01:50:16)</small>

[quote]'''Taris Blue wrote:''' 

{{Quote|user=300zxturboftw|For the latencies of these injectors, they are pretty much the same when the same manufacturer correct? As in the Rx7 injectors are all bosch, which I notice already that the latencies are closely similar. This is the only confusing part of tuning the injectors I still don't understand. This just tells it how long to open them correct?

Just FYI, my S5 550cc primaries are Denso injectors…not Bosch…they are the OEM mazda ones and they have the round/oval clips}}

You are 100 % right, I meant Denso, yet I said Bosch. All of the Rx7 OEM injectors are DENSO. Thanks for the correction.

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'''jono794:''' <small>(2010-12-21 04:32:08)</small>

Bosch/Ford green top - 0280 150 558

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'''michaelp:''' <small>(2010-12-28 15:50:35)</small>

[quote]'''michaelp wrote:''' 

{{Quote|user=shromy|Yes lets keep this going. Are bin files up-loadable?

Edit no they are not [archived image: frown.png].

If anyone wants to share BIN files I will host them on my site and post them here, just e-mail me them.

Z31NA2T (at) rochester.rr.com}}

[http://savannahsuperstore.com/na2t/bin/Irunlowerk.bin From Shromy]

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'''Careless:''' <small>(2010-12-28 17:01:24)</small>

mike, start another thread please.

mods- can someone clean this up and perhaps sticky so that it's not lost in the pile of rubble ?

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'''shromy:''' <small>(2010-12-28 20:11:35)</small>

Yes please sticky

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'''shromy:''' <small>(2010-12-30 01:13:51)</small>

Sticky this to for the other pete's sake.

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'''300zxturboftw:''' <small>(2011-01-05 07:35:15)</small>

I'm going to start with Latency of 750 on mine and raise it accordingly for idle. Let's say my injectors were flow tested at 680cc @ 43.5 psi. If I took 680/43.5 then multiplied by 37 psi I get 578.39cc. Should I start with this as the injector resize function in nistune, or go with 680cc.

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'''michaelp:''' <small>(2011-01-05 17:22:47)</small>

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[archived image: formula-4.gif]

627cc, not 578cc.

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'''300zxturboftw:''' <small>(2011-01-05 23:01:51)</small>

Oh yeah, forgot about that formula. Thank you.

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'''Careless:''' <small>(2011-03-15 04:18:39)</small>

1) can a mod clean up the drivvle in this thread?

2) huge list of tested inj latencies for certain injectors:

[http://injector-rehab.com/shop/lag.html http://injector-rehab.com/shop/lag.html]