Resistor trick for LS7...?
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Burning Brakes
Joined: Mar 2006
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From: Baytown Tx
Resistor trick for LS7...?
I've been trying to find any info on doing the old MAF resistor trick on the new card style MAF on the LS7 but can't seem to find enough information. What is everyone doing after installing a small dry shot to keep your n/a tune then have the nitrous tune when armed or when the MAF/IAT see's the drop in temp. Thanks...
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Thread Starter
Burning Brakes
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From: Baytown Tx
Wonder why some of the guys are having probs with fuel. My stock pump w/ BAP seems to work like a charm with zero lean spikes. But I've also had the big rails and 60lb injectors from the last project...maybe thats helping.
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Burning Brakes
Joined: Mar 2006
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From: Baytown Tx
Haha...only need one for the C teamers Joe. We know where we need to be on the nitrous tune but we're trying to find a way to use a resistor for the IAT or wire in a relay to trick the pcm as the LS7 IAT sensor isn't reading like we thought it would when its sprayed. We're under the impression the IAT sensor in the card style maf isn't reading like the other style maf's. I may have Billy give you a call to pick ur brain.
Last edited by DJ'sZ; Mar 23, 2013 at 04:21 PM.
Intermediate
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Run the resistor and relay to your coolant temp sensor. You can still set it for 240* coolant temp with the 8* of retard. Plus, if its working, you'll see the coolant temp spike on your dash so you know it's working.
Safety Car
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From: TEXOMA
St. Jude Donor '08-'09
Car doesn't go into reduced power mode with high ects?
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Melting Slicks
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From: Houston
Been reading up on this for days and considering it but there has to be another simpler, less expensive way. Thanks...!
Haha...only need one for the C teamers Joe. We know where we need to be on the nitrous tune but we're trying to find a way to use a resistor for the IAT or wire in a relay to trick the pcm as the LS7 IAT sensor isn't reading like we thought it would when its sprayed. We're under the impression the IAT sensor in the card style maf isn't reading like the other style maf's. I may have Billy give you a call to pick ur brain.
Haha...only need one for the C teamers Joe. We know where we need to be on the nitrous tune but we're trying to find a way to use a resistor for the IAT or wire in a relay to trick the pcm as the LS7 IAT sensor isn't reading like we thought it would when its sprayed. We're under the impression the IAT sensor in the card style maf isn't reading like the other style maf's. I may have Billy give you a call to pick ur brain.
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Burning Brakes
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From: Baytown Tx
This has got us baffled Joe...spent some more time on it this evening. It's not doing what we were hoping. Obviously its getting additional readings from someplace other than the IAT sensor to what we are trying manipulate. Looks like some type of controller is in the near future. 
Pro
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From: St. Petersburg FL
Thread Starter
Burning Brakes
Joined: Mar 2006
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From: Baytown Tx
I'll run this by my tuner to see if thinks its doable for what we're trying to acheive...will this also allow us to add fuel at a specific point or what the TPS see's...?
Pro
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From: calgary alberta
Use a relay to redirect iat circuit thru a resistor [ around 240 ohms] in series with the stock iat sensor. The relay is activated with the nitrous. Log iat temp which will likely be about 60 C . Shorting the iat will put you at the max in the table. Either way works. Go to the iat spark table and pull timing at 60>. Go to the injector flow rate vs iat and set 60 C> to .85 or whatever will give desired afr on nitrous [.80 is richer than .90] . This leaves na tune alone.
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Burning Brakes
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From: Baytown Tx
Another option
Use a relay to redirect iat circuit thru a resistor [ around 240 ohms] in series with the stock iat sensor. The relay is activated with the nitrous. Log iat temp which will likely be about 60 C . Shorting the iat will put you at the max in the table. Either way works. Go to the iat spark table and pull timing at 60>. Go to the injector flow rate vs iat and set 60 C> to .85 or whatever will give desired afr on nitrous [.80 is richer than .90] . This leaves na tune alone.
Use a relay to redirect iat circuit thru a resistor [ around 240 ohms] in series with the stock iat sensor. The relay is activated with the nitrous. Log iat temp which will likely be about 60 C . Shorting the iat will put you at the max in the table. Either way works. Go to the iat spark table and pull timing at 60>. Go to the injector flow rate vs iat and set 60 C> to .85 or whatever will give desired afr on nitrous [.80 is richer than .90] . This leaves na tune alone.
Safety Car
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From: St. Louis, MO
Tech Contributor
Already did.
Its doable. Having the skill set to make it work is another ball game.
Its doable. Having the skill set to make it work is another ball game.
Thread Starter
Burning Brakes
Joined: Mar 2006
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From: Baytown Tx
Finally got it to work as planned...thanks for all the advise!! I believe 120 ohms was all we needed to get the IAT to see 230 degrees. Was a bit more challenging than we figured it would be. Thanks Billy for not throwin' in the towel.
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