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Lurker
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If the stock value is 75 it could be microseconds and ECU multiples by 10.
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Old 11-04-2010, 03:21 PM Lurker is offline  
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#196  

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Aldaris
 
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75psi attained?
I'm assuming that you're talking about the compression on number six
Old 11-04-2010, 08:40 PM Aldaris is offline  
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#197  

Aldaris
 
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Detonation is your friend, am i rite?

Old 11-04-2010, 08:41 PM Aldaris is offline  
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[H]ard|On
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Quote:
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75psi attained?
I'm assuming that you're talking about the compression on number six

no it's like oartec but not as old

i think boshi or whatever his name was tried to claim some porch ran on 75 PSI with welded heads at some race or another

then couldn't find any proof, so it became a bit of a genmay refference
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Old 11-05-2010, 12:16 AM [H]ard|On is offline  
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#199  

Jehannum
 
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So, I finally went through and put together a better tune for the Z.

Main fuel map (AFR in each cell, red vs. blue is an indicator of open or closed loop operation)


Main spark timing map


Knock fuel map (this was previously my "main" map)


Knock spark timing map (this was previously my "main" map)


From this (which I think is a good first approximation), I'll be dyno tuning at a dedicated session sometime in early 2011. I can see expanding the closed loop mode, since the turbos don't really spool at 2500 RPM anymore (more like 3500, lol), but mostly my attention will be on timing.

I also have to plug my knock sensor back in now.

I've got three 27C256 chips sitting on my desk with different guesses at latency and flow values. I'll see which comes closest this weekend.
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Old 11-05-2010, 01:28 PM Jehannum is offline  
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#200  

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Wow it's so lean above idle at part throttle.

Is that normal?
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Old 11-05-2010, 01:39 PM [H]ard|On is offline  
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Jehannum
 
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Wow it's so lean above idle at part throttle.

Is that normal?

Lean cruise, it's there so that I don't get 11MPG highway

It's also part of the stock maps (pretty much no tuner touches the closed loop part of the map).

At any rate, the part where you worry about knock is where the map starts to dip down into the 13s.
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1992 300ZX: Not stock, 433 RWHP
1971 240Z: Toyota front brakes, 123 RWHP
1967 Pontiac GTO: not stock.
Old 11-05-2010, 01:51 PM Jehannum is offline  
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#202  

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nissan mass air is so ass backwards to everything else out there.

i'm so not looking forward to tuning an RB25 w/ a holset on nistune soon; I've tuned 100+ honda's (crome, hondata etc) about 10 AEMs 2 haltech;s one Apex-i and i'm having to relearn everything for Nistune :-/

On a side note voltage offset/dead time/latency doesn't really have that much effect on things; under normal conditions the voltage will not vary more than a few volts 12-14 nominally and most injectors dont really vary much around there. Latency/offset (whatever you wanna call it) really only comes into play while cranking and in case of an alternator failure. those are the only times i've ever had to make any changes is on cars with problems or in AEMs case taking a while to sync getting the fueling just right. Either way under load at 50-80% duty cycle the battery offset wont effect AFRs too wildly... Even on a honda with 1200cc injectors (resistor box even no inj driver) with Crome I barely touched the battery offset to make it idle and crank over happily.
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Old 11-05-2010, 09:57 PM Will suck dick for d16 is offline  
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Quote:
Originally Posted by Jehannum View Post
Lean cruise, it's there so that I don't get 11MPG highway

It's also part of the stock maps (pretty much no tuner touches the closed loop part of the map).

At any rate, the part where you worry about knock is where the map starts to dip down into the 13s.

Yea, I agree. The figures look good.

I cruise at 16:1, its perfectly fine.

Im surprised the map is TP vs RPM not KPA vs RPM.
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Old 11-05-2010, 11:27 PM Lurker is offline  
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#204  

mrselfdestruct
 
Yeah I was wondering about that too, is that just a mislabelled axis?
Old 11-07-2010, 03:49 PM mrselfdestruct is offline  
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Yeah I was wondering about that too, is that just a mislabelled axis?

No kpa, there's no MAP,

TP actually stands for "Theoretical pulsewidth", and it works like this: MAF reads 0-5.1v, the ecu matches the voltage up on the VQ Table, pulls a number from its anus, and then after a mathematical formula and a smoke break, calculates the TP.

So, sorta-kinda mislabeled axis.
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1992 300ZX: Not stock, 433 RWHP
1971 240Z: Toyota front brakes, 123 RWHP
1967 Pontiac GTO: not stock.
Old 11-11-2010, 02:46 PM Jehannum is offline  
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#206  

u467
 
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Wow it's so lean above idle at part throttle.

Is that normal?

I'm running smoothly at 16.5-17 at low rpm, low load, NA for closed loop
Old 11-11-2010, 03:23 PM u467 is offline  
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#207  

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Turbo motors are still a strange area for me. NA for closed loop = no boost before it's warmed up?
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Old 11-11-2010, 06:00 PM [H]ard|On is offline  
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#208  

u467
 
NA = naturally aspirated

I'm still sorting out the turbo car but having trouble finding time to finish it. Wiring in Boost control this time and thinking about running in open loop all the time after a recent conversation with a local tuner.

I <3 AEM EMS
Old 11-11-2010, 06:25 PM u467 is offline  
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#209  

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Quote:
Originally Posted by [H]ard|On View Post
Turbo motors are still a strange area for me. NA for closed loop = no boost before it's warmed up?

In MS world open vs closed loop just means that when running closed loop fueling is tweaked on the fly using feedback from an oxy sensor. In Open loop the fueling comes strictly from a table.

When I cruise, less than 100kpa, I am running closed loop to achieve better fuel economy. When in boost, greater than 100KPA+, I run open loop because I dont trust the computer to make correction in boost. If the O2 readings got screwy in boost it could potentially have catastrophic consequences.

Quote:
Originally Posted by Jehannum View Post
No kpa, there's no MAP,

TP actually stands for "Theoretical pulsewidth", and it works like this: MAF reads 0-5.1v, the ecu matches the voltage up on the VQ Table, pulls a number from its anus, and then after a mathematical formula and a smoke break, calculates the TP.

So, sorta-kinda mislabeled axis.

OH. That explains it. Throw all that in the garbage and get something that uses a MAP sensor.
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Last edited by Lurker; 11-11-2010 at 07:56 PM..
Old 11-11-2010, 07:47 PM Lurker is offline  
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