Very Dissapointing dyno result 1uz + gt42r

[thechuckster]

a - wtf is going on with the alternator (scale on the voltage would help)
b - map sensor - is that being pegged at 14psi by you or is that maxed out at 5V?
c - you have the 7mgte injectors still? are they being PnH driven (as they are lowZ injectors)? 80% duty is kinda high tho.

[millsi]

a - volts are fluctuating as much as 1 volt
b - cant say i can see that on the graph
c- nope injectors are ID1000's now, he did a calc and said they werent any where near their duty cycle

[thechuckster]

map sensor - was just curious whether it was sticking at 100kpa because that's as high as it reads or because the motor is making your life difficult.

injectors, is that scale on the injectors for a 0-100 (and we're seeing values of 2 to 8%) or 0-10 range (and you're getting to 80%)? or just opening time expressed as m/sec?

[The Witzl]

I can see a few problems with that log.

1. MAP sensor is at the top of the scale.... either your MAP sensor is too small, or someone has not configured your ECU properly. Based on a scale of -80 to +100kpa, that would mean you only have a 2bar MAP sensor, and it's maxed out.
2. Injector duty cycle is at the top of the scale on the log. I would've thought you'd need larger than 7M injectors to deliver enough fuel for a big turbo 1UZ

Of course, i am assuming that the scales on the log represent the limits of your hardware/tuning configuration. If that is incorrect, then my assumptions could well be wrong.

I would look at your MAP sensor and injectors.

[SHEPPO3930]

IMO i'd be giving it a couple more psi and see what that does. at 10psi the turbo isn't working efficiently.

[midnight_purple_GA70]

How is adding more boost going to fix the voltage fluctuations or other problems?

[JP]

the voltage fluctuations would be playing havoc with the injector deadtime for the EMS, contributing heavily to the lean spikes in the graph under load

[The Witzl]

well you cant see the scale for the voltage spikes.... so for all you know they could be 0.3Vpp or less?
If they are more like 0.7Vpp or more, then we are having some issues i'd say.

[thechuckster]

on PF, consensus was wiring issue (you can see it manifested on the system voltage) affecting fuel & spark.

I understand it was heading up to JZX25 up on the sunshine coast for the wiring to be looked at.

[The Witzl]

I wouldnt jump to that conclusion until you know just how big that voltage spike is.
.... but yes, wiring could be a concern.

I would also look at the other points raised regarding map sensor and injectors though.

[JP]

on the other thread it was stated 1V peak to peak

[The Witzl]

ahh.... well yes that is quite significant, and certainly does show a wiring issue.

[millsi]

I mentioned it earlier in the thread but volts are fluctuating at least 1.0 volt.

This will sounds stupid, but how can you see anything to do with the MAP sensor in those graphs?

Injectors are ID1000's so should be no where near the limit.

Sheppo, the main problem happens at 15 psi, the 10psi graph is to show that its not as bad when on 10 psi, though still down on power.

[millsi]

Fail on not reading the last page before posting

[millsi]

So, the earthing was fixed, alternator had the reg and rec replaced. Runs fine with good afr's but no increase in power. Having a custom inlet made and fitting up a 100mm cooler in place of the 75mm one which was showing a drop of 2 psi at 10 psi. Not totally shit but not great and wont help when the boost is upped.
Big thanks to justen for coming to the party with a lower manifold to work with.