Timing Pull Resistor Trick !
yeah, i think im actually going to do this for another application as well, alot of our vehicles are byfuel here at work and have an extremely shitty and conservatice tune on them, so when they switch to CNG they run like **** with no timing. i may use this device to pull timing back out when it switches to regular gasoline, and use the iat vs spark table to adjust how much is pulled out. should work.
That table Power adder vs IAT, or what ever it is called. We had tried this for fueling the before the MAF style kits. Unless you were getting a good cold reading, it didn't work well, and also the temp reading could vary. What the table really is, is a PE multiplier that gets added onto your WOT Power Enrichment multipier. I do have all the numbers on what multiplier numbers equal what a/f ratio should anyone decide to target a temp and use this table. Another way to fuel the Dry shots. 
Robert
Robert
I hope someone else will respond to this Wattage question, but here's a guess.
power in watts =(current in amps)squared x resistance in ohms
I'm not sure the current at the sensor however... anyone have that from a meter? It should be VERY low....
power in watts =(current in amps)squared x resistance in ohms
I'm not sure the current at the sensor however... anyone have that from a meter? It should be VERY low....
Yeah I bought some resitors last nite and I got the smallest wattage that radio shack had(Forgot what they were) I couldnt find a 750 Ohm resistor so I bout some 680ohm and 68ohm. in sure 748 is close enough to 750(given how they are ratied to 5% accuracy anyways.
HOWEVER I have a question:
Im going to mout my realy close to the PCM. Which wire(s) and location in the one whe are looking for here from the IAT sensor?
Thanks
HOWEVER I have a question:
Im going to mout my realy close to the PCM. Which wire(s) and location in the one whe are looking for here from the IAT sensor?
Thanks
Ok why would this not be working?? Did this mod Thai wkend have not had chance to put ohm meter on it. Wired thru relay to n2o switch as portrayed by the diagrams. Just clarify, I cut the tan wire & ran from IAT to 87a and the other end from pcm to 30. Is that correct?? Car struggling to idle and running Very rich!!
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Thread Starter
Staging Lane
Joined: Mar 2008
Posts: 58
Likes: 0
From: Kuwait City
Ok why would this not be working?? Did this mod Thai wkend have not had chance to put ohm meter on it. Wired thru relay to n2o switch as portrayed by the diagrams. Just clarify, I cut the tan wire & ran from IAT to 87a and the other end from pcm to 30. Is that correct?? Car struggling to idle and running Very rich!!
does switch work is "ON" ?!! cheak all wire from switch of is OFF
^^^ not quite understanding all of your message. But I disconnected the relay and reconnected the tan wire back together. Car still running bad. Like it has never been tuned. Gonna go thru and check all my sensors but I don't see how, I didn't mess with any others.
10 Second Club
Joined: Nov 2002
Posts: 1,471
Likes: 3
From: Berkeley, California
This is a valid concern. I'm not sure about other PCMs but the 2002 PCM samples the IAT sensor twice per second so the delay is one half second or less. This is not a problem if the timing-tricker relay is directly enabled by the nitrous active switch and not through the WOT switch. If the TT relay is enabled through the WOT switch then a half-second delay may be introduced whenever you lift. This would be a significant problem in a manual transmission car.
On my 98 I have the "tricker" going active on the WOT switch and no issues thus far. I haven't data logged anything, but on they dyno we have no zero knock and no lean spikes.
10 Second Club
Joined: Nov 2002
Posts: 1,471
Likes: 3
From: Berkeley, California
If the timing-tricker relay is enabled through the WOT switch then the worst case would be if the tricked IAT is used to pull timing and to add fuel. There then could be a half-second delay before timing is pulled and fuel is added and you would be spraying during the delay. This is a lesser problem for auto cars that typically remain at WOT throughout a run. Similarly, the problem would not appear on a dyno.
Last edited by Gary Z; Oct 3, 2009 at 01:57 PM.
Ive got mine wired to the nitrous arm switch, So when the arming switch in on the realy is enerjized. But still, Does anyone know what location these 2 wires are on the pcm? 02 model
Registered User
Joined: Oct 2009
Posts: 1
Likes: 0
From: Canberra, Australia
Has anyone using this method had any problems with the IAT itself or know of any issues it may cause?
I am in the process of installing a NOS plate and deciding on either the 'trick' or having a second PCM tuned specifically.
I am in the process of installing a NOS plate and deciding on either the 'trick' or having a second PCM tuned specifically.
Depending on how your tables are set up. In stock form it will likely pull timing whenever it is activated. Thats why you wire it up so that it is only activated when the system sprays.
