Injectors? HE351 on l28et

[MerloZ]

Ok so not sure if this is exactly what we are talking about but I think it is 

I set required fuel to 300cc injectors. I've read these injectors flow 330 when clean and at 40.5 psi. That's all about where I'm at but I never cleaned them just ran them for years. 

Did some autotuning to adjust the cells down and drove a few miles. At 4-5k rpm with a fuel load of 160-180kpa two cells down from the top my pulse width goes over 25 might of even hit 30, and my duty cycle hits 120% 

I think injectors are the correct answer here right? 

I did a engine +map log but I'm not sure if that has the injector info on it or not. I didn't see a pulse width or duty cycle log?.

 

[MerloZ]

What size injectors. It was previously mentioned 440cc were running out with this setup. I'll probably get them from godzillaraceworks along with everything else needed. 550cc??

[MerloZ]

Welp. Got 550cc injectors installed and I'm pretty sure I spun a rod bearing trying to get this tune squared away. Not sure where all my oil went but I was a half inch below the dipstick. Would detonation cause this?. It doesn't seem like that's what was going on but I can't really explain it. How can one fuel cell be 10.5 afr and the next one goes full lean. Injectors made it better with some tuning but just as it started to smooth out on most spots. The engine made noise. I was an hour from home or more and I figured it was just the waste gate rattling on the inner fender.. fml. What can I do here once I rebuild it again to stop this from happening. I've heard knock sensors are like impossible to tune and to not waste my time.  Back a long time ago chicken man helped me out with my base tune and told me that I believe. I was still going on his tune with this turbo and never saw it over boost. Afr would just go out of range and the car would surge/buck the diff.

[lowrider]

On 11/11/2024 at 1:34 PM, MerloZ said:

Ok so not sure if this is exactly what we are talking about but I think it is 

I set required fuel to 300cc injectors. I've read these injectors flow 330 when clean and at 40.5 psi. That's all about where I'm at but I never cleaned them just ran them for years. 

Did some autotuning to adjust the cells down and drove a few miles. At 4-5k rpm with a fuel load of 160-180kpa two cells down from the top my pulse width goes over 25 might of even hit 30, and my duty cycle hits 120% 

I think injectors are the correct answer here right? 

I did a engine +map log but I'm not sure if that has the injector info on it or not. I didn't see a pulse width or duty cycle log?.

 

A injector duty cycle of over 85-90% is indicative of running out of injector. 100% duty cycle is the injector wide open. 
Because you changed your fuel pressure and required fuel without any kind of math to calculate the fuel injector flow change with the extra fuel pressure, it’s hard to really know if the injector duty cycle megasquirt reported was true or not. 
 

Based on an Internet fuel injector calculator you would have needed to be running 60lbs of base fuel pressure for the 260cc/min factory 280zx turbo injectors to flow 330cc/min. It’s likely that you were locking the injectors up with that high of a duty cycle which would explain the abrupt lean event at/ above 4500-5000 rpm. 
 

I’m sorry to hear about the rod knock. It seems like this was a lesson learned the hard way. Be sure to check your pistons because detonation with the intensity and duration to stuff a rod bearing has more than likely taken some ring lands with it as well (from experience). Broken rings/ ring lands could account for the oil consumption. 
 

I would also change out your fuel pump to one that will more than accommodate the power levels and fuel type you intend on running for the next motor.