I replaced the "Charge Temp - Inverse temperature term vs charge temperature term" values
It ran much better cold
And it starts up by itself hot now. Started 3 out of 4 times without flooding. Wouldn't of got it even once before. Still need to adjust the crank BPW I think.
Also noticed the AFR is always slightly richer now. Looks like ill be going back to the VE table for that.
What is the "Charge Temp - Inverse temperature term vs charge temperature term" all about?
Why would I need to modify this from standard when I am running standard manifold/injectors/sensors etc etc?
First Tune
Re: First Tune
Was that with the new tune i done for you?
Re: First Tune
Charge temp is there to stabilise AFR"s over all temperatures.
Ive tuned quiet a few 5 litres with stock intakes and they all need a tweak in that tabke. Especially with cams in them.
They all fall bsck to the values from the VN HSV tunes. The VR stock tune is a bit different.
It has no effect on cranking fuel. Changingit can band aid some VE issues as well so need to watch the logs carefully
Have you ran my latest one yet I posted? Quite a bit of VE work was done. And changed the target AFR's down from 13.5 at 100kpa. Once the VE is closer you don't want that under load.
Did you get a look at the fuel pressure?
Ive tuned quiet a few 5 litres with stock intakes and they all need a tweak in that tabke. Especially with cams in them.
They all fall bsck to the values from the VN HSV tunes. The VR stock tune is a bit different.
It has no effect on cranking fuel. Changingit can band aid some VE issues as well so need to watch the logs carefully
Have you ran my latest one yet I posted? Quite a bit of VE work was done. And changed the target AFR's down from 13.5 at 100kpa. Once the VE is closer you don't want that under load.
Did you get a look at the fuel pressure?
-
VX L67 Getrag
- Posts: 2959
- Joined: Sun Aug 02, 2009 9:16 pm
- Location: Bayside, Melbourne, Victoria
- Contact:
Re: First Tune
It shows your adjusted bin hasn't been downloaded yet, he might just want to tweak himself but I'd recommend downloading it to have a look!
Re: First Tune
He has made some big changes to the ve and afr table from the one i supplied which is great to see him having a go.
The log showed that 95kpa 4400 with a target afr of 13.5 getting 12.8 which a good actual AFR but the VE is way out.
Also for my defense I didnt target 13.5 at 95kpa. But good to see him think of ways to lean out the top end
The latest one I done has the VE adjusted from the log he supplied. It was a good log. Would of loved to of seen it from cold to help with the charge temp.
Waiting on a fuel pressure check because I've never seen a cammed V8 with srock injectors want peak VE in the 80's with a lowered injector rate. If the pressure is wound up thats all good we can get the VE right and all is good.
It would also explain the cranking fuel problem.
Also a check of the base timing wont hurt there's a fair bit of timing there but some wrong AFR's can make them feel like they're lacking.
Looking forward to a log of my latest bin.
The log showed that 95kpa 4400 with a target afr of 13.5 getting 12.8 which a good actual AFR but the VE is way out.
Also for my defense I didnt target 13.5 at 95kpa. But good to see him think of ways to lean out the top end
The latest one I done has the VE adjusted from the log he supplied. It was a good log. Would of loved to of seen it from cold to help with the charge temp.
Waiting on a fuel pressure check because I've never seen a cammed V8 with srock injectors want peak VE in the 80's with a lowered injector rate. If the pressure is wound up thats all good we can get the VE right and all is good.
It would also explain the cranking fuel problem.
Also a check of the base timing wont hurt there's a fair bit of timing there but some wrong AFR's can make them feel like they're lacking.
Looking forward to a log of my latest bin.
-
VX L67 Getrag
- Posts: 2959
- Joined: Sun Aug 02, 2009 9:16 pm
- Location: Bayside, Melbourne, Victoria
- Contact:
Re: First Tune
Yeah no I wasn't bagging you at all so no need to defend (I trust your work!) I was just saying even if he didn't want to use your adjusted tune he should at least look to compare!
Don't mind me chiming in from my beautiful crystal blue water views from balcony in Hamilton!
Don't mind me chiming in from my beautiful crystal blue water views from balcony in Hamilton!
Re: First Tune
Nah mate wasn't on the defense here just come across wrong. Just thinking out loud really few things don't ad up.
Im mad keen to help him out though I done original tune for him so just want to make things right.
Im mad keen to help him out though I done original tune for him so just want to make things right.
Re: First Tune
I haven't had a chance to do another log or look at your updated tune yet. I only had a quick play around Sunday. Unfortunately it will have to wait until next weekend as that's the only chance I really get at the moment with work etc.
I really appreciate all the help you've given me Dylan. Hope you don't mind me having a play around, it's a big learning curve and I hope to learn a lot more yet. I did change the target AFR.
First thing on the agenda will be to get another log from cold with the new Bin
Then check the fuel pressure.
And re check the base timing. I did set it to 10 degrees with the diagnostic connector bridged but I'll recheck it to confirm. Timing might not be out as far as I originally thought. I'll know the base timing will be correct as the balancer is brand new and I checked the timing marks with a dial indicator before I put the heads on.
I really appreciate all the help you've given me Dylan. Hope you don't mind me having a play around, it's a big learning curve and I hope to learn a lot more yet. I did change the target AFR.
First thing on the agenda will be to get another log from cold with the new Bin
Then check the fuel pressure.
And re check the base timing. I did set it to 10 degrees with the diagnostic connector bridged but I'll recheck it to confirm. Timing might not be out as far as I originally thought. I'll know the base timing will be correct as the balancer is brand new and I checked the timing marks with a dial indicator before I put the heads on.
Re: First Tune
All good mate it will be worth the wait when it's sorted. Should only take a few more updates.
Nothing wrong with having a crack it's how you learn.
Look forward to next weekend for the log.
Nothing wrong with having a crack it's how you learn.
Look forward to next weekend for the log.
Re: First Tune
Ok ive made a bit of a "break through" which is going to probably change virtually everything Ive done so far.
It turns out my fuel pressure is way out of spec, AND my fuel pressure reg is leaking/rooted.
I put the fuel pressure gauge on it this morning and instantly thought it looks a bit high when I seen 57psi / 390Kpa at idle. Took the vacuum hose off the reg and seen something Ive never seen before. The pressure swung back and forward violently between high 50's and 65 psi.
Went to put the vacuum hose back on and noticed there's liquid fuel dripping out of the vacuum port.
Just proved you cant trust parts (my pressure reg) which have been laying around unused for probably 3 years, even though they were probably fine before. I guess the diaphragm has dried up and split. Wish I had of taken the 10 minutes to check this before now.
That would explain the flooding on start and the extreme richness at high vacuum/deceleration as well as Dylan noticing the VE table doesn't sound right from his experience.
In good news the base timing is spot on. And it ran much better with the new bin. Im not sure if you altered the timing or if the engines just running in but it certainly felt alot better.
And I think ive got another reg here somewhere. Are early V6 ones are the same (VN/VP V6)?
Should I go back to the original tune you gave me after I replace it or keep working from this one?
It turns out my fuel pressure is way out of spec, AND my fuel pressure reg is leaking/rooted.
I put the fuel pressure gauge on it this morning and instantly thought it looks a bit high when I seen 57psi / 390Kpa at idle. Took the vacuum hose off the reg and seen something Ive never seen before. The pressure swung back and forward violently between high 50's and 65 psi.
Went to put the vacuum hose back on and noticed there's liquid fuel dripping out of the vacuum port.
Just proved you cant trust parts (my pressure reg) which have been laying around unused for probably 3 years, even though they were probably fine before. I guess the diaphragm has dried up and split. Wish I had of taken the 10 minutes to check this before now.
That would explain the flooding on start and the extreme richness at high vacuum/deceleration as well as Dylan noticing the VE table doesn't sound right from his experience.
In good news the base timing is spot on. And it ran much better with the new bin. Im not sure if you altered the timing or if the engines just running in but it certainly felt alot better.
And I think ive got another reg here somewhere. Are early V6 ones are the same (VN/VP V6)?
Should I go back to the original tune you gave me after I replace it or keep working from this one?