pinging 1jzgte

[Endless]

Yep AFAIK fuel filter is located just above the diff, not near the rail.

[lojik]

I'm not looking at more power for the time being, just want to drive it around is all. I have a st162 that needs to be back on the road so I can sell it. So time needs to be put into that more than I need to get this to over 300hp at the wheels. That can come later.

Above the diff hey. That will be fun to change... :/
Anyone in Perth got a pressure gauge I can make use of?

[lojik]

OK, I've traced the lines from the tank to the fuel rail. Fuel filter is nowhere to be found
I'll grab a filter and some hose and put it inline with the fuel feed. Is that the line that runs to the front or back of the fuel rail? I'd be able to get something suitable that has barbs so I dont have to get threaded attachments for the hose right?

Then hopefully all I need is the injectors to be cleaned and should be good.
I got quoted 40-45 each for the injector cleaning, sound ok?

ta again to those who've posted in here, much appreciated.

[urantia]

Sorry lojik, something i didn't take into acoount and couldnt find in the thread is what sort of car your 1jz in installed into? For some reason i figured you had a cressida. (probably why you can't find the fuel filter.)

[lojik]

its an ma61, i think I mentioned it previously.
Regardless there doesnt appear to be a filter installed :/

[chris davey]

you want to put the filter on the line that goes into the back of the fuel rail. The fuel then goes to the other end and excess is let out by the fuel pressure regulator. This is a small cylindical object on the fuel rail near the throttle body. It will have a vacuum hose connected to it.

[lojik]

Just wondering what the stock injector size is, i've read both 380cc and 440cc.
Would this be too small at 270rwhp?
yes, i have searched.

Trying to decide whether its worth looking for injectors now, instead of cleaning the stock ones and possibly not fixing the issue.
ta

[jonra23]

Working on a 30% driveline loss give 351flywheel hp or 262 flywheel kw.

Formula for injector requirements in cc/min =(engine kw X BSFC X 7.83)/(number of injectors X injector duty cycle)

BSFC is Brake Specific Fuel Consumption, should be calculated on a dyno if possible, turbo motors generaly around 0.6 to 0.7.

So for your example (262 X 0.65 X 7.83)/(6 X 0.8) =278ccmin.

Injectors are generaly rated at 3 bar pressure across the nozzle so if you are not running a fuel pressure of boost + 3 bar (43.5psi) you will nedd to calculate a correction factor to allow for lower pressure.

regards
jon

[chris davey]

stock injectors are 380cc. You can use the formula above or for a 6 cyl it is usually 380cc = 380hp at the fly. 380*.75=285kw at flywheel 285*.8=228rwkw (assume 20% drivetrain loss)

Either way, some people have made up to 250rwkw on stock injectors so 270rwhp or 202rwkw is not going to be pushing them.

[Draven]

no, but if his car has gone a significant amount of time with no fuel filter then the injectors may be clogged and ruining the efficiency.

[jonra23]

Really need to check the fuel rail pressure, injectors may or may not be blocked, pump may or may not be NFG, fuel rail pressure will point ot either supply or injection.

regards
jon

[chris davey]

yeah, good point.

I would run some injector cleaner through it and install the fuel filter.

Also, didn't see it before buy 9.2ms at 4300rpm is a lot hey. I run 550's so 44% bigger than stock and I run 7ish ms at 17psi on a single turbo at 6000+rpm. That is like you running 10ms on your injectors.

Can you post a screen shot of your fuel and ignition map?
Also, any datalogs you have of the pinging area.

If the fuel pressure is low for some reason then you will need to use more duty cycle to inject the same amount of fuel also.

[jonra23]

In post 13 lojik said he was running a duty cycle of 93%, so he has low pressure across the injector nozzle; either pump, filter, regulator or blocked injectors.

Rail pressure would be handy to pin it down further from there.

regards
Jon

[lojik]

Does injector cleaner work well? I was going to take the injectors to an efi place and get them cleaned properly.

Havent got access to the maps/logs atm, perhaps later this arvo.

[lojik]

OK. I'm digging this one up from its fresh grave.

I've had the car at the workshop where I had it tuned originally. I've had the injectors cleaned and the fuel pressure checked. The injectors are apparently still maxing out, and the guy is trying to tell me that a big part of the problem is the injectors are running in a multipoint configuration (all firing at the same time) resulting in the fuel rail not being able to supply enough fuel for the injectors. In a sequential setup this would apparently not happen (supported by the haltech e8, but not the e6x)

Does this make sense, or is he just talking nonsense and trying to upsell me to a newer ECU.