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Timing Maps for Tuning

Thread: Timing Maps for Tuning

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Posts: 81-90 of 156
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2011-02-18 04:06:59
#81
Yep

Originally Posted by Vadim
Thing is, unless your using TunerCode, TP from Car 1 will not equal to TP form car B ever. They might be close if you have same mods, but every engine flows differently.

TP that high is not good either, he is probably using a z32 maf and at least 370cc injectors.
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2011-02-18 05:25:19
#82
Originally Posted by Will
I hit like 112 TP value the other night, tonight I was only seeing 106. Same onramp, same gear, same WOT.


what maf and injectors do you have. Also are you close to or pegging the maf out?
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2011-02-18 05:27:34
#83
Originally Posted by Romadore
Supe what was the AFR under load with this timing map?


10.0 air fuels car bucked and missed. fuel issue was more of a problem than timing with this tune.
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2011-02-18 05:30:30
#84
Originally Posted by Romadore
As I said I have experienced this where the timing being low caused an overly rich AFR. If there isn't enough timing to burn the fuel then your AFRs are going to richen up especially when load increases in the 5k-redline area. Of course the degree of timing that can cause such situations varies from car to car.

Don't get me wrong I am not saying you are incorrect, however I am just stating what I have experienced as well as citing the reasons.


Cam timing can also cause factors like this also. This is why you stay in check mechanically too.
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2011-02-18 05:41:17
#85
Originally Posted by supercowboy
what maf and injectors do you have. Also are you close to or pegging the maf out?


Z32 maf and 370cc injectors (maybe at 4 bar)
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2011-02-18 16:13:27
#86
Originally Posted by supercowboy
what maf and injectors do you have. Also are you close to or pegging the maf out?


Originally Posted by Vadim
Z32 maf and 370cc injectors (maybe at 4 bar)


right, z32 and 370s at 4 bar for the moment. I have some 740cc nismos about to go in.

I am a little concerned with the MAF voltage, its maxing out around 4.3v, which seems rather high. Does the z32 go to 5 or 6v?

I suspect a boost leak off of the manifold somewhere, the IC piping is fine. My a/f ratio is perfect so its hard to believe a boost leak is happening, but maybe.
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2011-02-18 16:18:55
#87
Originally Posted by Romadore
Wnwright the question isn't silly, you just did not understand it.


Riiiight

Originally Posted by Romadore
The question was asked under the assumption, that the vehicle was consuming a safe amount of fuel thus it presented with safe AFRs. As such I did not see the need to question supercowboy about his fuel map, as he seems very competent in what he is doing.


And like supercowboy replied... Fuel issue. What a shocker... I wish I understood what was going on. It isn't like he couldn't change AFRs with the fuel map or anything.
Last edited by wnwright on 2011-02-18 at 16-27-48.
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2011-02-18 16:46:47
#88
Originally Posted by Will
right, z32 and 370s at 4 bar for the moment. I have some 740cc nismos about to go in.

I am a little concerned with the MAF voltage, its maxing out around 4.3v, which seems rather high. Does the z32 go to 5 or 6v?

I suspect a boost leak off of the manifold somewhere, the IC piping is fine. My a/f ratio is perfect so its hard to believe a boost leak is happening, but maybe.


Did you fix your TPS measurements? MAF's max out at 5.12v. You got plenty of play.
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2011-02-18 18:17:33
#89
Originally Posted by Vadim
Did you fix your TPS measurements? MAF's max out at 5.12v. You got plenty of play.


isnt the TPS supposed to be between .45 and .55 closed and over 4v wide open?

closed I am at .52 and open at 4.12.

I know I'm not maxing out the MAF yet, but it seems strange that at 11.5psi on a t28 making under 300whp that I would be over 4v on a z32 MAF that should be good for 500whp.
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2011-02-18 19:33:46
#90
Originally Posted by Will
isnt the TPS supposed to be between .45 and .55 closed and over 4v wide open?

closed I am at .52 and open at 4.12.

I know I'm not maxing out the MAF yet, but it seems strange that at 11.5psi on a t28 making under 300whp that I would be over 4v on a z32 MAF that should be good for 500whp.


http://www.nicoclub.com/FSM/Sentra/1995_Sentra/ec.pdf

Page EC-164. For 95 it says Fully released is 0.35-0.65V fully depressed approx 4V.

I guess you are within spec on low end. I from data log that I saw your WOT voltage was more like 4.25-4.50v
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