Thanks, I’ll post up the last run that I did tomorrow.Originally Posted by kur4o
Thanks, I’ll post up the last run that I did tomorrow.
'95 Z28 M6 -Just the odd mod.
'80 350 A3 C3 Corvette - recent addition.
I've definately been fighting this since I built the motor.
I've uploaded the last 2 decent runs I did.
The bin used will vary slightly but I've only changed VE tables as I've been chasing the WB AFR up and down.
Thanks for looking
Mitch
'95 Z28 M6 -Just the odd mod.
'80 350 A3 C3 Corvette - recent addition.
Still not sure if it is a mechanical problem, bad tune or a mix of both.
Do you have older logs with the other sets of injectors.
You got constant knock at lower loads. Mixed side intermitten lean condition at low load conditions.
I suggest you start all over with your tune. I can make a starter bin and work from there.
That way we can rule out the bad tune hypotesis.
It's always been off 1 side. Nothing has ever made much difference.
Injectors we replaced. Then swapped side to side & centers to outside.
Not sure if i can ID logs with the previous injectors, I'll have to check.
[QUOTE}
You got constant knock at lower loads. Mixed side intermitten lean condition at low load conditions.
I suggest you start all over with your tune. I can make a starter bin and work from there.
That way we can rule out the bad tune hypotesis.[/QUOTE]
Again it's always been like that. Since going OLSD the car has run and felt miles happier especially at 11-13:1
I'll try anything you can think of.
A new tune would be interesting.
MAF is still on the car, just disabled as I have been trying to get the VE sorted.
This probably explains why the VE tables end up looking like a toblerone!
I still think this could be an issue with the inlet manifold, vac leak underneath.
I switched to synthetic oil a couple of hundred miles ago.
Car still drinks oil andsince the switch the manifold has started leaking at the rear china wall.
I've been reading/Youtube on PVC valves so can check that tomorrow night. Prompted by the rear seal starting to leak.
I'm open to suggestions on how to pinpoint the Vac leak to the manifold before I pull it. 2 sets of gaskets cost me about 80 USD last time
Another thought on something I read was the bolts for the push rod guides on the AFR heads breaking into the Inlet Ports.
I remember using LACO Thread sealer on the Head bolts and pretty certain I used it when installing the push rod guides.
Something else to check.
Cool.
I await your response.
Thankyou
Mitch
'95 Z28 M6 -Just the odd mod.
'80 350 A3 C3 Corvette - recent addition.
OK
Got a couple of Datamaster logs with the 32Lb Bosch III's.
Interested to see what you see in them !
Thankls
Mitch
'95 Z28 M6 -Just the odd mod.
'80 350 A3 C3 Corvette - recent addition.
Earlier logs have much more consistent 02 data.
I suspect the injectors just don`t open at low PWM{below 2ms} condition at random intermitten rate.
It could be the pcm can`t handle it or the injectors are garbage.
You can bring back the smaller injectors. Reload factory VE, Spark, Individual cylinder trims and all knock retard related tables.
Fix the injector data flow and offset. Low pulse width correction are really important. I see all zeroed at the latest bin
Increase cylinder volume to 935.
Reseal the m22 plugs and retighten the header bolts.
The knock could be real or false. Lowering total advance will show if it`s real
If it is false you will have to find out what`s causing it.
OK thanks.
I'll check a few things this weekend and chuck the 32lb Bosch III's back in.
Anyone got ANY specs for the Bosch III's or any recommends for anything better with some proper specs?
Why the cylinder size to 935. The motor is a 383 so cyl volume should be 783.70cc
IS the injector adder the time taken for the Injector to open and stabilise flow?
Would increasing this make any difference? (presumably not if the injectors can't open anyway in this time )
Zeroing them seems to be the only consistant info I have for these.
How would the PCM/injectors cope with a huge cam that required bigger injectors then as the the fuel requirements wouldn't be much different at idle so opening time on a bigger injector would be similar.
What's a stock injector idle pw time for comparison?
Advance changes never seemed to make any difference.
Running pig rich does which is why i still possibly suspect the manifold, if it's not the injectors.
I'm 99% certain there is NO _usual_ vacuum leak anywhere. Everything has been gone over many times.
Even knock sensor has been replaced twice.
As to the manifold, I'll log again and pump propane into the rocker cover with the PCV valve blocked off just to see.
Thanks again
Mitch
'95 Z28 M6 -Just the odd mod.
'80 350 A3 C3 Corvette - recent addition.
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