Thread: Initial startup gremlins

yes resistor box makes a difference unless you are able to change dead time/ latency of injectors. On gtir powered B13, seemed to break up under 40% load, changed fuel pump/filter/plugs, we had borrowed dizz, maf from another motor, and eventually ecu. no changes in drivability, but other motor had complete engine harness, and found out about resistor box, intially made one with the JWT resistors, which shook to death over 2 yrs, ohm'd a honda one and it was close, found pigtail, wired in, for 8 yrs the car has ran flawless.

I didn´t drive the car yet, it´s on stands... but it runs so nice on DE maf a stock injectors!!! that´s really weird...

Several projects are running gtir ecu with high impedance 370cc´s and ubaru 440cc´s and even s15 and nismo 550cc´s and i didn´t read once about this problem...

So i need top feed fuel rail, gtir 440cc injectors and resistor box?

you have a matched injector/ maf DE/DE if you had gtir/gtir I'm sure it will run fine.
just a wierd coincidence that a peak and hold injector driver would fire a saturated injector.
if you get lucky you get lucky right ?
other option is get nismotronic RT ecu and be done with it.
Injectors and MAF scalars usually correspond when used as a tag team, when the tag team is broken up by mixing with other parts, the ecu's calibration will cause a drivability problems. As for you running several other projects with gtir ecu, were you able to use a stock ecu from any of the other cars with different injectors ? to see if there was a difference ? are you using a wideband to determine if the car is running properly ?

DUnno much about this but if I'm not mistaken stock injectors are 259 cc not 290.

Exactly Benito, my bad... i´m just tired...




I do have a innovate WBO2, the idle is like 15:1 when hot(ish) and when i´ll give it a little throttle i see momentary low 12´s high elevens... but the car is on stands and, does not almost see boost and above all it´s not on load... only when i drive it, and do some datalogs in datascan, i´ll know for sure... the wbo2 varies soo fast it´s not reliable...

I see what you mean, but pretty sure i´ve read somewhere people using high impedance injectors on gti-r ecu... the only way around is impossible... something like this...

I´ll be making more research as soon as i can...

Edit: i found this: http://www.sr20-forum.com/tuning/42840-running-gtir-b13-ecu.html

From what i understood, the ecu does not have peak and hold injector drivers in the ECU in itself...

Evlnxr even quoted: "Ive used a GTIR ecu to drive normal high impedance side feed injectors with no resistors no problem, seems to work as normal."

Also gti-r guys are using high impedance injectors in their cars, they simply remove the resistor box: http://www.nissangtir.co.uk/forum/forum_posts.asp?TID=4442

Does anyone know if the toyota celica/mr2 3sgte gt4 ones fit? Are the same plug design? Their side-feed and i found plenty at a good price in ebay.co.uk? 430cc and 550cc capacity

EDIT:

I found my answer, diferent plug design.

Yes, you are right, GTR 440s were the only P&H injectors, GTiR was saturated.
Got stuck on the resistor box notion of P&H.

Thank you anyway, at least you tried to help...

I´m bidding on a complete set of Subaru 440cc yellow side feed injectors with plugs on ebay... lets hope i win...

Also found that you just can swap the plug terminals without cutting your harness.. wich is nice...

I´m waiting on a reconditioned set of Subaru yellows and engine harness... the cars been runing great with the DE maf on the gtir ecu, but it maxes out past 5000, so i don´t go that far until i tune properly... i just dumped fuel trough the SAFC and retarded the ignition to 15º just to be safe...

And the clutch just started slipping... as expected... just to update... the td05h is a great match to the sr20de i think...

And the EUDM sr20de is 10:1 afterall...

Ok guys, the STI yellows arrived, don´t know the diference from USDM´s(everybody quotes them from 480cc to 520cc)... but the UKDM were flow tested@440cc´s... the same as gti´rs...

Tried to swap wire terminals but end up giving up, don´t have proper tools and didn´t seem proper fit... did the conections everything worked ok, started the car and it stumbled a bit, like misfiring... the WBO2 indicated pig rich, took alot of fuel, like 45%@idle, trough the SAFC2 and it purred very nice... like stock...

Went for a ride, did a log with datascan 1.52 with WBO2, and the car is pig rich everywere... then i remenber i was using a DE maf with the gti-r ecu... swapped to the gtir MAF(that i tought it was f*cked) and it seems good, altough very rich...

So:

DE 259cc´s, DE 53j MAF, GTIR 54c ecu= runs fine, like stock, very powerfull dur to agressive timing, maxes out when on boost and after 5000rpm

440cc´s(gtir or sti), DE 53j maf, GTIR 54c ecu= runs like crap, pig rich everywere maxes out around 5000...

440cc´s(gtir or sti), GTIR DET 54c maf, GTIR 54c ecu= gold


Moral of the story, it seems to me that´s very important to match the MAF with the injectors... you can probably use the DE our DET ecu, the diference it´s in the maps... but in terms of the car running right the maf/injector combo it´s the priority...

Then i could be wrong... ahahahhaha...

Following that logic, if you use the 370cc´s you should use the s14 MAF...

Here´s some pics(the oil breather is temporary, i´m going to do it properly):