Changing injectors

dzammit85 · Postby **dzammit85** » Fri Apr 22, 2016 1:22 pm

Hi,
I just bought a adaptronic ecu for my nb8b, I'm looking at putting a turbo in but right now am just gathering the parts for it when I can afford them, so what I was wanting to know is would changing the injectors to larger ones be a good idea before I get the Ecu tuned for my car as it is now (without turbo)
Currently it is pretty standard, just iridium spark plugs and mangacore leads have been put in, and also a heavy duty clutch, lightweight flywheel and 3.9 torsen diff
Any thoughts on this would be great, even other things that I could change before tuning it
Thanks

dzammit85 · Postby **dzammit85** » Fri Apr 22, 2016 1:24 pm

Also if you think the injectors are worth it, what ones would you recommend, as I have heard good things about people using the rx8 injectors in a mx5

Postby **NitroDann** » Fri Apr 22, 2016 1:41 pm

rx8 yellows. Do them now instead of tuning it twice.

dzammit85 · Postby **dzammit85** » Fri Apr 22, 2016 4:11 pm

Ok great thank you

1green5 · Postby **1green5** » Fri Apr 22, 2016 9:47 pm

NitroDann wrote:rx8 yellows. Do them now instead of tuning it twice.

What?
Install injectors now = computer tune
install turbo & parts later = computer tune

That's twice

Install injectors at the same time as turbo & parts = tune once

OP, check out miataturbo.net

Postby **NitroDann** » Fri Apr 22, 2016 10:29 pm

When adding a turbocharger to a car already equipped with an ecu and injector upgrade you dont do a full tune.

The ecu upgrade will need:

Ecu install including running the hoses.
Wideband install
Basemapping including sensor and fuel system setup
Check base timing
Set limits and safety features
Tune hot start
Tune closed loop idle Idle
Tune Enrichment tables
Tune Coolant enrichment tables
Tune Air Intake Temp compensation tables
Tune 2/3rds of the timing table
Tune 2/3rds of the fuel table
Road test

If you install the ecu AND the injectors at the same time you need to do all of the above plus:

Install the injectors

This should be worth 10-15hp over not installing the ecu, however the injectors do not add power.

If he then turbocharges the car it will need the following ecu related work:

Tune last 1/3rd of fuel map
Tune last 1/3rd of timing map
Tune boost tables.

As you can clearly see this is NOT 2 whole tunes. Its one full turbocharger tune in 2 separate sessions. If you did the n/a tune, then swapped the injectors you would have to redo the following after the injector change:

Tune hot start
Tune closed loop idle Idle
Tune Enrichment tables
Tune Coolant enrichment tables
Tune Air Intake Temp compensation tables
Tune 2/3rds of the timing table
Tune 2/3rds of the fuel table
Road test

The above list is what most shops would call a 'full tune' which takes a week to get right, because cold behaviour is difficult to get right and needs a few goes when the car is dead cold.

Dann

project.r.racing · Postby **project.r.racing** » Sun Apr 24, 2016 8:49 am

Dont argue with dann when it comes to injectors and turbos.

IanR · Postby **IanR** » Thu Apr 28, 2016 9:32 pm

NitroDann wrote:When adding a turbocharger to a car already equipped with an ecu and injector upgrade you dont do a full tune.

The ecu upgrade will need:

Ecu install including running the hoses.
Wideband install
Basemapping including sensor and fuel system setup
Check base timing
Set limits and safety features
Tune hot start
Tune closed loop idle Idle
Tune Enrichment tables
Tune Coolant enrichment tables
Tune Air Intake Temp compensation tables
Tune 2/3rds of the timing table
Tune 2/3rds of the fuel table
Road test

If you install the ecu AND the injectors at the same time you need to do all of the above plus:

Install the injectors

This should be worth 10-15hp over not installing the ecu, however the injectors do not add power.

If he then turbocharges the car it will need the following ecu related work:

Tune last 1/3rd of fuel map
Tune last 1/3rd of timing map
Tune boost tables.

As you can clearly see this is NOT 2 whole tunes. Its one full turbocharger tune in 2 separate sessions. If you did the n/a tune, then swapped the injectors you would have to redo the following after the injector change:

Tune hot start
Tune closed loop idle Idle
Tune Enrichment tables
Tune Coolant enrichment tables
Tune Air Intake Temp compensation tables
Tune 2/3rds of the timing table
Tune 2/3rds of the fuel table
Road test

The above list is what most shops would call a 'full tune' which takes a week to get right, because cold behaviour is difficult to get right and needs a few goes when the car is dead cold.

Dann

...and then takes as small breath, types another 2500words...

bruce · Postby **bruce** » Thu Apr 28, 2016 9:37 pm

And you get charged twice.

Aiming Faster · Postby **Aiming Faster** » Thu Apr 28, 2016 9:43 pm

Good juice there Dan, is that similar for ITB tunes (mine's a Megasquirt) too? Thanks.

Postby **NitroDann** » Thu Apr 28, 2016 11:24 pm

ITB's like an injector change require almost all of the tables to be retuned.

If you did ecu/tune.

Then you did injectors,

Then you did ITB,

You would do 3/4 of a tune 3 separate times.

Turbochargers dont affect idle or cold start of cruise in any meaningful way so adding a turbo is an easy tune most times.