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#1 | ||||
Junior Member
![]() Join Date: Jan 2008
Posts: 18
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![]() Has anyone tried adding a resitor in line with the IAT sensor?
If you do this you can fool the PCM into give more igntition advance. I am about to try this and I am not sure of what resitance range to start with. Suggestions? Ken
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#2 | ||||
Senior Member
![]() ![]() Join Date: Jul 2005
Location: Northern Virginia
Posts: 1,598
1998 SL2
1995 SL2
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![]() ... "When you stop to fill up on oil, don't forget to check the gas" 98 SL2 MT 213K+ Daily Driver 38+ mpg 97 SL2 AT 150K Original Owner 95 SL2 MT 220K+ My Saturns have BRASS ones!
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#3 | ||||
Junior Member
![]() Join Date: Jan 2008
Posts: 18
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![]() OK I appeciate your strong feelings about this, but this post does not tell me why you feel so strongly about this. I have done this with other cars and it works, not as good as a PCM program or piggyback chip, but it works and it is free. What's the worst that could happen--- check engine light? A little spark knock? I can undo this mod in 1 minute if I don't like it. On the other hand, maybe I am missing something. I don't claim to know everything, that is why I am posting this question. Fair enough? Ken
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#4 | ||||
Member
![]() ![]() Join Date: Oct 2007
Location: Nova Scotia, Canada
Posts: 216
1997 SL2
1996 SL1
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![]() These cars run plenty rich as it is. I can't see richening them up even more helping matters, and will probably only serve to carbon up your rings even faster than stock...
... 1996 SL1 5m loaded except sunroof *SOLD* 1997 SL2 5m Loaded including sunroof, fog lights, and console bin. Et nunc, reges, intelligite, er udimini, qui judacati terram
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#5 | ||||
Super Member
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![]() These cars run way rich as it is. Fooling the PCM into thinking its colder than it really is would cause fouling of the spark plugs, the O2 sensor(s), clogg the catalytic converter, poor performance and poor fuel economy.
In the short term, you would waste money on gas the goes unburnt out the tailpipe. In the long term, you'd ruin hundereds of dollars in parts. All for a $0.25 part that really does nothing beneficial. ... Mike -1991 Turbo SL2 - Gone, but not forgotten. 11.809 @ 116.488 mph www.differentracing.com -2000 Saturn SC2 -2001 Chevrolet Suburban -2011 Rally Yellow Chevrolet Camaro 2SS RS
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#6 | |||||
Junior Member
![]() Join Date: Jan 2008
Posts: 18
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![]() Quote:
OK now this is some useful information. I did not realize that the Saturn ran so rich. I don't think a few degrees shift would cause as much disaster as you mention, but you point is well taken. Thanks for the good info. Ken
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#7 | ||||
Super Member
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![]() BTW, the iat resistor mod is not an ignition advance trick as it has absolutely nothing to do with the ignition system's electronically controlled timing. There are numerous threads, if you take the time to research it, in these forums using the search function, reading the suggested threads initially posted at the bottom of these posts, or simply wading through the posts. The members here are not impressed when someone comes here presuming to know a few facts without some research behind this and will let you know very quickly, if not abruptly, to cease any lengthy postings since it been covered so many times in the past.
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#8 | ||||
Advanced Member
![]() Join Date: Aug 2005
Posts: 897
1996 SC2
1995 SC2
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![]() You have to realize though that it will only have an affect on the fuel control until the O2 sensor warms up. Once the O2 sensor is online, it makes all the corrections to maintain the 14.7:1.
If you disconnect the O2 sensor, it will always run off those sensors however. If you really wanted to get serious, you'd want to use a scan tool to observe the effects to be able to tune it. The MAP and ECTS also play a part with those operations. But, with a knock sensor integrated into the system, the car is suppose to utilize maximum spark advance without spark knocking anyways...
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#9 | ||||
Master Member
![]() ![]() Join Date: Oct 2002
Location: San Antonio, Texas
Posts: 2,682
2008 Astra XR
2008 SKY Red Line
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![]() Though it doesn't change anything in the original topic of the replies to this post, this statement isn't entirely true. Spark tables are tied to fuel tables. There are many fuel tables that have associated spark tables with very conservative spark profiles. In these tables, the engine would acheive nothing near full or optimum spark advance. Though, in general, what you write is true, just not in an absolute sense.
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#10 | ||||
Senior Member
![]() Join Date: Oct 2002
Location: L.A.,CAL
Posts: 1,393
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![]() I did the opposite.I put a 110ohm resistor to fool the engine into thinking the intake air is 224*.according to my scanguage, it's netting me around 2-4 more m.p.g.
... www.bold-fortune.com
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#11 | ||||
Member
![]() Join Date: Oct 2006
Location: farmington , mi
Posts: 342
1991 SL2
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![]() At WOT is around 12 (from my readings)
... Saturns are slow
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#12 | ||||
Senior Member
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![]() My saturn ran 9.8:1 at WOT before I put the SAFC in. Adding more fuel would definitely NOT help you in this situation.
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#13 | ||||
Advanced Member
![]() Join Date: Aug 2005
Posts: 897
1996 SC2
1995 SC2
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![]() It does not run off the O2 sensor at WOT. WOT is not normal operation.
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#14 | |||||
Advanced Member
![]() Join Date: Aug 2005
Posts: 897
1996 SC2
1995 SC2
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![]() Quote:
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#15 | ||||
Master Member
![]() ![]() Join Date: Oct 2002
Location: San Antonio, Texas
Posts: 2,682
2008 Astra XR
2008 SKY Red Line
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![]() Under most of the maps, that's true. But under some, it provides a very slow and limited advance rate. That is why goofing around with the sensors anticipating some improvement somewhere can put you in a place you didn't intend. Doing these things without the benefit of at least reviewing sensor data for a baseline is not good tuning discipline.
And anyone running A/F ratios below 12:1 on a stock engine has some serious tuning issues going on. 9.6:1 would be pouring black smoke out the back. Must be something wrong with the wideband to see that kind of ratio.
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#16 | ||||
Advanced Member
![]() Join Date: Oct 2007
Location: Kansas
Posts: 785
1995 SL2
1995 SL2
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![]() WOT is not closed-loop operation but that sounds a little on the rich side, even for a Saturn. Stock injectors and fuel pressure regulator?
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