The Tuning Talk Thread - Forced Induction EFI & JZ Tuning.

[JP]

that's a bit different to the function I've seen in the autronic, adaptronic and vipecs... Those have overall trim functions too, but they also have trigger offset values you can adjust so the actual engine timing matches up to your values in the timing map. Especially usefull on engines like the 1&2jz, 1zzfe, 2zzge etc where the triggers are fixed and you dont have any physical adjustment available.

If the wolf doesn't have that functionality, then I'd do a timing lock on it, and adjust the distributor until the physical timing displayed with the light matches the value in the software. Also make sure that the physical value read with the light doesn't change while the igniton lock is on and the engine is rev'd, that can cause tuning headaches too.

I'll download the wolf software and have a look to see if I can find the function available on the other ECU's.

[OnAll-FOUR]

that's a bit different to the function I've seen in the autronic, adaptronic and vipecs... Those have overall trim functions too, but they also have trigger offset values you can adjust so the actual engine timing matches up to your values in the timing map. Especially usefull on engines like the 1&2jz, 1zzfe, 2zzge etc where the triggers are fixed and you dont have any physical adjustment available.

If the wolf doesn't have that functionality, then I'd do a timing lock on it, and adjust the distributor until the physical timing displayed with the light matches the value in the software. Also make sure that the physical value read with the light doesn't change while the igniton lock is on and the engine is rev'd, that can cause tuning headaches too.

I'll download the wolf software and have a look to see if I can find the function available on the other ECU's.

okay sorry, Im really showing my inexperience/noobness with ECUs

Looking a bit further in the configuration options, Trigger REF, there is the setting for "REF Degrees BTDC.

REF Degrees BTDC
Set the known trigger point BTDC (Before Top Dead Centre of cylinder 1)
of the REF trigger sensor to allow exact alignment of the ignition and timing delivery systems.

Can be calibrated by inspection with a timing light while using the Ignition Lock function to lock the ignition timing to a known fixed value, then this can be adjusted until the inspected timing matches.

Note:
This must not be set greater than the number of degrees between REF events or erratic ignition timing may result.

[JP]

Bingo!

That sounds like the right option. So you should be able to use that so your timing light reading lines up with the software reading. Beware that any changes made through that section will be like an overall ignition map change too, so you might have to adjust your timing map a bit depending on how far the trigger is out.

[TIMTAMS]

WOW i have alot of reading to do!

[ecko]

not sure if this is the right place to ask but.
if removing the ac compressor on a 1jz (non VVTI)
what serpentine belt do you use?
any help would be great

[CELICASUPRA7M]

why would u want to remove the compressor? it wont use any power untill its turned on.
its a myth that they drag power.

[ecko]

its just dead weight i guess.. someone else might need one so might aswell sell it..

[Yotaholic]

not sure if this is the right place to ask but.
if removing the ac compressor on a 1jz (non VVTI)
what serpentine belt do you use?
any help would be great

Dayco 5060735 works great

I'm from Canada so AC is not mandatory ,,,unfortunately

[ecko]

Thanks + rep

[jeffro ra28]

What are peoples opinions for injector cutoff on deccel for more performance based engines in a cruise situation? Thoughts?

[JP]

I use it on mine. Built 2.5L with 800cc sards and vipec ECU.

TPS Threashold of 1.3%, activation delay of 1sec (could probably reduce that a little), ignition retard of -10deg and de-activation rpm of 1500rpm from 80deg onwards. The De-activation rpm scales from 4000rpm down to 1500rpm over the temp range of 0-80deg coolant temp.

Helps save a bit of fuel and keep the engine smooth during decel conditions

[JZA70 R]

i turn my injectors off on decel until rpm drops to 1000rpm. the power fc has no problem catching the motor at idle and i havent had any side effects to having idle and fuel cut so close together.

i like to have the injectors off on decel because A. it gives silence on decel instead of unwanted popping and burbling B. saves fuel and C. i would imagine the o2 sensor and injectors catch a break (could be extending the life of the wideband sensor) and pumping fresh air (although a tiny amount) through the motor may be doing its bit for temp reduction (probably an insignificant amount).

[thechuckster]

actually, decel fuel cut cools O2 sensors down and excessive heat cycling and poisoning is what seems to kill them, but if you've got a wideband sensor its internally heated anyway so the heating/cooling issue is rather academic.

I have/had a similar setup to JPs but without the ignition retard and with an arbitrary temp cutoff - tho i didn't wait until the motor had fully warmed up.

I started with a 2 sec delay, but had slowly reduced it to nearly 0 by the time the car went off the road.

[jeffro ra28]

JP, whats your engine? 1jz?

Thanks for your input, tis something i may need to learn a little about for the 1jz and autronic when the time comes so those specs are helpfull

Im asuming after a WOT run or a heavy load situation the injectors dump a shit load of fuel after closing the throttle to cool things down?

[JP]

Mines a built EJ257... in my daily driver forester so only 4x 800cc injectors ;-) CP Pistons, Pauter Rods, GT30 etc etc. Used to run an autronic SM4.

I'd like to put a vipec in my 1jz wagon and get rid of the vvti's waste spark setup and MAF, but can't justify the $$$ for another ECU at the moment, too many other projects on the go.

In terms of fuel delivery after max load/torque/power, once the throttle snaps shut and manifold pressure drops my map goes to an AFR of 13.9:1 until the fuel cut kicks in (1sec delay)

Here's a copy of the target map from that engine, it's rich right down low to assist with a smooth idle with it's heads/cams.