Thread: Initial startup gremlins

Setup:

9.5:1 sr20de EUDM GTI motor
gtir chipped ecu
gtir maf
370cc injectors
SAFC 2
td05h16g turbo

First startup to check leaks etc etc, standard MAF,ecu and injectors... everything fired and sounded right...

Next i changed to gtir ECU and MAF, sounded bad and stumbled quite badly... would not hold idle...
I tought, OK, that´s because it´s running smaller injectors... changed the injectors and didn´t start at all...

Took out the injectors, tested them and 2 are bad... good resistence but they are closed shut... dirty??? too much time in the shelf?

Ok so back to stock injectors... started but stumbled, so i tough, let´s try the 53j MAF with gtir ecu, and man, what a diference, the car sounds soo smooth and nice... revs nice etc... even better then stock...

I tought the 53j MAF would not work with 54c ECU, and stock 290cc´s wouldn´t work with gtir ecu but they do... maybe not good, and pretty sure they will max out when on boost, but just for info they do...

So now i have 2 questions...

1-Will a stock 53j MAF work to 200/225bhp on a 54c ecu(corrected with safc 2)?

2-Wich is better, subaru 440cc´s@3bar or 370cc´s@4bar, ignoring the installation problems or price... just plain "efectiveness"?

the stock injectors max out a 200whp on 3 bar. you need to run what the ecu is programmed for. it may be fine at idle but I can tell you the car will not be fine wot. generally when your ecu gets chipped you need to adjust the tps to .48volts and verify the base timing. Its also help for to have nissan data scan so you can see whats going on. You can also force a relearn using data scan.

If you have the safc-2 hooked up disconnect it and try to the start the car again.

You can dial out your issues with the safc-2 but you would be better off running the correct parts and using the safc-2 to fine tune. Hope you get things sorted out.

I do have datascan... the DE maf reads like 1.3/1.5 volts at idle, the gtir DET 0.6/0.7...

The gtir ecu is for 440cc injectors, but i tought of running 370cc@4 bar, since i´ve read somewhere that they fuel atomisiation@4 bar is better, don´t remember where, and since they´re bolt on, unlike gtir ones, that was my first option... at 4 bar their pretty close to 440cc´s, it´s like 429cc´s or something...

The base timing need to be retarded i know, the tps thing didn´t know, but this is when i have the setup finalized, but right now i´m out of MAF and injectors...

290cc´s at 4 bar are good for how much presure/bhp on a DE?

I did that, and did setup the hw5/hw6 for the correct MAF... GTIR SAFC2 settings are different from GTI...

I need to buy injectors i know... but would really like to go for spin, the car sounds soo brutal...

And i don´t really wish to buy another gtir maf, since i´ll upgrade it latter on to z32... if the DE worked for a while, on low boost, that would save me money...

is the ecu is the ecu programmed for the stock gtir 444cc injectors or 370's @ 4 bar?

In fact, i don´t really know... i bought a stock ecu that turned out to be chipped, it was sent by misake, read here: http://www.sr20-forum.com/tuning/50603-big-value-special-engine-builders-gti-r-ecu.html

Later on i enquired the seller about the injectors present on the car f wich the ecu was taken, and he said they were stock, so i assume 440cc´s but no 100% sure...

But i´ll use the safc 2 to iron out... fine tune...

gtir uses resistor box. is it present ? also TPS wires are reversed on gtir.
My B13 used to run Power FC RNN14, I had issues until I was able to figure out latency values, which were affected by having resistor box vs not having one, and the TPS voltages. I had choice of MAF calibration on Power FC, never had issue after that.

No, because i´m not using low impedance injectors... don´t need a resistor box... will it afect the ECU, to have one or not?

Tps seems ok, i was aware of that problem, i even started this tread: http://www.sr20-forum.com/tuning/50854-gti-r-ecu-sr20de-t-setup-tps-wires.html

With the datascan conected, ignition on, engine off, the TPS voltage varies between 0.5 and 4.5/4.6 volts... like it should... with DE MAF the engine seems normal and smooth and really really nice and powerfull... so the EUDM sr20de´s don´t have that problem...

Acording to the MAF voltages there´s no doubt the GTIR maf is bad...

Aparently TPS is not an issue...

Does the resistor box makes a diference?