deatchwerks 700cc injector tuning
 

I want to get some additional input, as I think the settings supplied by deatchwerks are a lil off. I know the injector flow constant was off but I am primarily asking about the throttle tip-in a/b these numbers are significantly lower than whats in the uel tunes and in a tune I have for turbo based off sbd. and in driving, I have noticed that upon throttle changes I am seeing it go way lean, like deep off lean. so am wanting some opinions :thanks:

The deatworks setting will be compensating for the bigger injectors


stock is 228cc


as the crank tables and tip in tables are a raw pulse width rarter than flow you need to compensate for having injectors 3 times the size hence the lower tip in numbers.


however you have a turbo so you may rant to increase the tip in table numbers.


you also need to make sure you maf scaling is ok first.


make sure you allow for fuel pressure as well a lot of injector scalings are for 45psi pressure but these cars run arround 65 psi.


try tip in numbers close to stock.


ie just change the injector scaling , latency and crank pulse compensation.


al try running full Direct injection till about 0.6 load in the pi/di tables.


the lean condition may be due to latency of port injectors rather than tip in tables

Steve you have been a great help thanks man! I figure something was up, the maf scaling I think I have a handle on still working on it little by little right now my biggest issue is when it go's drop dead lean , walking into it isn't bad, and once it does get into boost its smooth. I am running a swirl pot, and have my fuel pressure set at 43 no vacuum. for the iat cranking pulse width, I actually have it set to 0 and the car is starting on that, if I am not mistaken, that's what the cranking is for? opinion? change it?

I had a similar problem - RPM fluctuation by throttle tip in when neutral - after installing DW450 injector.

I've edited every table by DW 's instruction.
(Injector latency, injector flow brz , throttle tip-in AB, Cranking fuel IAT )

but after seeing your writing , I just made new map with stock tip in AB table, and using 100% DI under 0.6 load.

and ALL irregular throttle response & rpm fluctuation are gone.

thank you !!!

please excuse my ignorance but "running full Direct injection till about 0.6 load in the pi/di tables"
& "sing 100% DI under 0.6 load"

maybe I'm tired but I am not finding it in romraider and don't know if this matters but using oft

Theors two ways to adjust cranling fueling one is using the 6 or more pulse width vs iat tables amd the other is use the rpm vs pulse tables with bigger injectors its easier to ise the rpm vs pulse tables

these are my tables that I test today.

I will test about PI ratio% more. but these works good anyway.

BTW, your definition should have these tables.

that seems to be my issue my definition doesn't have those tables :/ I can find some of the tables in a tree labeled "alpha brz" but the "PI Ratio Threshold's" are completely absent

Easier way to achieve 100% di till 0.6 load is jist to put zero in the cells up to 0.6 load in all three pi\di tables clod warm hot


Some bigger port injectprs are not good at injecting small quantities of fuel at low pulse widths. As we have a dual injection system when your injecting from both systems pulse widths are even smaller. By going to 100% di at low loads your jist using the standard factory direct injectors which have suffient capacity at low loads to supply all fuel. Then switch in the port as fuel demand increases and longer pulse widths required

so we are on the same page you are talking about the "Total Injection Ratio Port cold/warm/hot" tables?

yes they are the three tables to change, zero out everything up to 0.6 load

did this but still isn't wanting to cooperate with me, while low throttle cruise its super rich, upon throttle it wants to head towards lean, once in boost afr is good but the transition isn't always smooth, this is bein a pita

If during low throttle cruise is still runnog 100% di ie its under 0.6 load then something is way off like maf scaling if its going rich on di only. As the di system has not been altered.


Its likely maf scaling way off, or strange fuel pressure issue


Check you di computer is solidly groinded via it mount bolts all three as if its not grounded\earthed weird fueling will happens its the computer bolted to side of engine



Also are you running ecutek with speed density ?

definitely grounded, hood via a circle earth ground, running oft, which I may be hitting its limitations at the level I am at :( I have it scaled for the sti maf in a 2.75 pipe atm and I have worked with it and got it about as good as it can be , it basically like idle or haul ass and no middle ground. I think my next step is probably getting ecutek with racerom, and ditching the oft

up to and including 0.6 LOAD? how much can the DI take before hitting duty cycle?

DI provides plenty of fuel.. you need to do a full throttle pull and log DI opening time (ms) and di injection end to spark (ms)
if you are at around 6ms and more than 1.5ms to the spark you are good

you won t max out DI at low loads

So reckon it's be safe zeroing all loads less than or equal to 0.6?

I wonder how tip in enrichment works also when there is a more significant DI only load region and having large PI injectors since the tip in is based off a strict time injection rather than quantity

Yes snything based on a injection time for port injectors will need compensation wgen larget i jectors installed

Any of you guys having startup weirdness or stalling after installing these injectors? I'm thinking there's some information that was missing from DW's install guide.