crap my JWT ecu is rich

[wild_maxx]

i have a ka24e-t with a jwt ecu programmed for 550cc injectors 8.5:1 comp pistons and a z32 maf and the SOB is rich. i upped the boost to 13 psi today and i am getting a/f ratio's in the 9's i am tuning it down with the safc but so far i have removed about 18% fuel and its still hitting 9's. wtf? base timing is at 15* my pistons are only 8:1 comp. think that has something to do with it?

[SeVa-S13]

Check for boost leaks?

[wild_maxx]

yes i did, i made the boost leak tester posted a while ago and didnt find any leaks. maybe i should check again.

[Craving4Boost]

is this during boost? whats your airflow on the safc monitor say? is your safc working properly? you didnt adjust any fpr did you

[wild_maxx]

no i didnt adjust any fpr the safc airflow reading i am not sure about and yes this is during boost. i will go drive it again and get my max airflow %

[HolyShiznit]

Ok first off, yes this does happen. I had to set my in and out settings on the SAFC all CRAZY. Different from any other KA-T, I am currently at nearly -42% at some points under boost. Upping the boost will do nothing to the JWT tune cause it adds more fuel based upon the air it reads coming in, thus more boost = more airflow = more fuel = still rich. Honestly just keep leaning the ****ing out of it until it changes. If that doesn't work time to start playing with the in and out settings bro.

Of course this is after you have made sure your boost leaks are locked down. I thought I had mad boost leaks too until I realized I had none and I just needed to take out THAT much fuel.

[klattr1]

what kind of 550cc injectors (side feed, top feed, brand etc) do you have and where did you order them from?

and whats your base fuel pressure at idle (with or without vacuum hose connected to FPR)?

[wild_maxx]

DAMN D00D i will def start taking out more. my in and out settings are 2in 6 out which is correct with the z32 maf right? did you use the 2 in add option or leave it at 1 1?

[wild_maxx]

the 550cc injectors are top feed high impednece rx--7 injectors. direct fit into the kae ruel rail. i dont know what base fuel pressure cause i dont have a gauge yet. thats on the list of to buy things. i had the fuel injectors cleaned, flow tested, balanced and rebuilt before i installed them.

[SeVa-S13]

If you have Walbro or similar hi-flow and hi-pressure pump you need an AFPR to get your fuel pressure where it should be, just FYI.

[wild_maxx]

ok, like i said thats being ordered next. i just went out and did some more tuning (wideband and safc) and i am starting to hit 10's a/f. when i am tuning the high throttle maps should i have the same setting across the board. my settings are about -25% @800 rpm's and go down by one % every rpm point ex. 3k rpm's is -23% then -22% then -21%.

[virus77]

Quote »DAMN D00D i will def start taking out more. my in and out settings are 2in 6 out which is correct with the z32 maf right? did you use the 2 in add option or leave it at 1 1?[/quote]I thought with a chipped ecu you would need to run the in-out settings of the mafs that was programmed on the ecu (EX: 5 in 5 out) , the ecu is already compensating for the new mafs.

[wild_maxx]

yes thats what i thought as well but it seems the run better with 2 in 6 out. with the 5 5 settings my airflow% read was at 100% with the car off (ign on) then as i reved it up the airflow % wend down. now with the settings at 2 6 it is all correct and idles better. it works for me so i am leaving it alone

[HolyShiznit]

Mine used the same reverse psychology bs. I wish I had a stand alone....

But ya hopefully it works out for ya.

[wild_maxx]

what about the safc setting across the board? should i set them all around -25% throught the rpm range on the high thr. map?

[Structure240sx]

did you try 6in 6out? thats what my car uses now

stock maf and ecu was 5in 5outstock ecu z32maf was 2in 6 outjwt ecu 6in 6out

[wild_maxx]

it wouldnt run with 6 in 6 out. any comment on the cutback on fuel throught the high maps?

[HolyShiznit]

On my setup I am uber rich as soon as I roll into boost so I am like -35% to -42% until 6grand then things get weird. Then I am down to like -13% I think.

[virus77]

Damn, it kind of takes away from point of getting the ECU in the first place, if you have to alter the maps so much its still screwing with the timing.

[Structure240sx]

get a timing scanner, i havent noticed any change in timing. i tunned 3 cars with a jwt ecu and safc

[wild_maxx]

hey structure, were you taking out as much fuel as we are. i am cutting it back further tomorrw to get the a/f into the 11's. the timing wasnt affected at all? or just not enouf to make a diff.

[Structure240sx]

on the other 2 cars, not mine yes. i brought them down to about -25% in the hi map in boost.

the way jwt usually works with timing, as far as a dohc (all i have expereince with). is the timing at full boost goes to 14-16 degrees then ramps up to 17-19 degrees by redline (less air flow/power dropping off)

it has always stayed within this limit. either way i would do anything you could to get a timing scanner of some sort to confirm the timing yourself, there has been known to be problems with some tunned ecu's

[wild_maxx]

ok i will look into the timing scanner. any brand a good one to look for? what are you using?

[deviousKA]

Pop the chip out of your ecu and re tune it to your liking, forget that safc.

eccs.hybridka.com

[Craving4Boost]

no dont forget the safc..it can come in handy.....its just like people who have FMU's..they have to depend on the fmu to work perfectly..using an safc can work to your benefit

[Structure240sx]

i use an mdm techtom that plugs into the nissan consult port that only comes on 91+ 240sx so it wouldnt work for you

another option is the apexi multichecker. it gets hardwired into the ecu harness much like the safc

[wild_maxx]

went out today and did some more tuning and damn its getting faster. makes a difference when running in 9-10 a/f then getting it to 11's. car is running alot better now. i have it set at -25% correction across the high maps and seems to be holding solid 11's during WOT.

[Structure240sx]

exactly

the last car i did was a built s14 with a jwt by itself. it was was running under 10:1 afr's bogging out bad in boost. threw on the safc and my wideband and made all the difference

good job glad we could help

[wild_maxx]

thank you very much structure. you always seem to be the one that helps me out the most on everything related to my car thanx again.

[Structure240sx]

[email protected] you can paypal me my fees now, j/k

im here for u