87 4Runner, 15" spring lift, 3" body, chevy vortec 355, 5.29 gears, 38.5x15.5x15" Boggers, 280hr, 16168625 running $0D
93 S10, 36x12.5x15 TSL's, custom turbo headers, 266HR cam, p&p vortec heads, $0D Marine MPFI with 8psi boost.
05 Silverado, 2' lift, 4" exhaust, Bully Dog programmer,
1994 3500 Dually , 502 (509) , 264HR , Edelbrock MPFI , PFI '7427
1992 S-10 434 SBC/Tremec - '7427
1986 Monte Carlo SS
1984 S-10 , SAS, 496/700R4/205 , D44/14BFF -'7427
1980 Z-28 496/700R4
1979 Corvette 496/700R4
1977 Olds 98 Regency 403/700R4
assuming you guys are cheap bastards like i am, you can make an alternative to a solid state relay using some MOSFETs.
since the PCM provides ground only when it wants something turned on, a P-channel MOSFET can probably be worked in, though i would confirm this with someone who actually messes with P-channel MOSFETs.
if i'm right about this, you can grab IRF9540 units from my favorite overseas supplier for $.61 each. each one is rated to continuously handle up to 23 amps in a TO-220 package. i'd add a heatsink to it and group a few of them together, but that's just me.
i can't figure out the pull up/pull down resistor logic though(i'm used to N-channel), so i wouldn't just jump at it instantly.
Just registered here after reading for hours.
Looks like you are the guys to come to when I have questions with my upcoming instal.
My first question goes to 93V8S10.....
Any chance you have a $OE ready version of this handy?
Thanks
Jim
1978 Camaro Type LT, 383, Dual TBI, '7427, 4L80E
1981 Camaro Z-28 Clone, T-Tops, 350/TH350
1981 Camaro Berlinetta, V-6, 3spd
1974 Chevy/GMC Truck, '90 TBI 350, '7427, TH350, NP203, 6" lift, 35s
Thanks, I saw that one, but it doesn't include the soft start or trans fan this one does though.
I might be able to figure out the coding to add them, since that post lists most of the locations. The way I understand it the locations are the only difference between $OD and $OE for the purposes of a fan hack....??
Still not sure I am up to the task of writing/modding my own code yet. Working on getting there, just need to get my head around this stuff a bit more before I will be very comfortable with it.
Jim
Last edited by Blazer3664; 12-24-2012 at 06:45 AM.
Yup that's pretty much it. $0D has some trans parameters that $0E doesn't, or at least aren't listed or commented. The Trans control scheme may be slightly different(which could encompass quite a lot of code), I haven't spent that much time comparing them.
Actually after thinking about it they would have to be somewhat different because of the Turbine Input Speed Sensor, and all the slip calculations that that the PCM makes.
Last edited by gregs78cam; 12-24-2012 at 02:37 AM.
1978 Camaro Type LT, 383, Dual TBI, '7427, 4L80E
1981 Camaro Z-28 Clone, T-Tops, 350/TH350
1981 Camaro Berlinetta, V-6, 3spd
1974 Chevy/GMC Truck, '90 TBI 350, '7427, TH350, NP203, 6" lift, 35s
OK A newbie here, i have been reading this post for a few days. I finally got around to getting some of these relays (Chrysler) mentioned above. I have wired up and programmed my PCM. It works pretty good except when the fans come on the lights inside and out flicker. I am thinking maybe it is too much amps to start the fan motor. Is there any solution to the flickering lights?
Last edited by fatjoe216; 02-18-2013 at 10:13 PM.
JUBEE
1987 Astro CL 350ci TBI
Rebuilt 700R4
Rebuilt 3.42 gears
Ugrade 7747 to 7427 PCM
Anyone??
JUBEE
1987 Astro CL 350ci TBI
Rebuilt 700R4
Rebuilt 3.42 gears
Ugrade 7747 to 7427 PCM
Got to be where the fan relay is getting power from? If it's stealing power from Accessories then yes, but if the fan relay was getting power from battery it should not happen...
1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
-= =-
JUBEE
1987 Astro CL 350ci TBI
Rebuilt 700R4
Rebuilt 3.42 gears
Ugrade 7747 to 7427 PCM
Could be a bad body or chassis ground
87 4Runner, 15" spring lift, 3" body, chevy vortec 355, 5.29 gears, 38.5x15.5x15" Boggers, 280hr, 16168625 running $0D
93 S10, 36x12.5x15 TSL's, custom turbo headers, 266HR cam, p&p vortec heads, $0D Marine MPFI with 8psi boost.
05 Silverado, 2' lift, 4" exhaust, Bully Dog programmer,
I am going to be using this to control my fans. I really don't need the TPS setting. Since I don't, where should it be set so it doesn't trigger due to tps, or possibly interfere with the other triggers(don't know if it can interfere)? Leave at 0, or put it all the way up?
'90 Suburban w/ pretty much stock 350 TBI, 7427 ECM Conversion, sadly sold several years ago
'95 K2500 Suburban w/ soon to be 400HP 454
So I just installed a electric cooling fan in my cherokee today. All I gotta do is finish up some wiring. Its a single fan, single speed, and I will be using a standard relay (not pwm). However, I am nowhere near smart enough to put the code into my bin. Is there anyone here that would be willing to do it for me if I email them a copy of my bin?
79 Jeep Cherokee, AMC 401, T-18 manual trans, hydroboost, 16197427 MPFI system---the toy
93 Jeep YJ Wrangler, 4.0L, 5 speed, 8.8 rear, homebrew hub conversion and big brakes, hydroboost, 2.5in OME lift, 31x10.50's---the daily driver
99 Jeep WJ Grand Cherokee limited, 4.0L, auto, 2wd, leather and power everything, 99% stock---the long distance highway ride.
It's easier than you think.
Open up the hex editor in Tuner Pro (ctrl+h IIRC), go to the addresses needed and type the HEX values into the locations indicated in the first post. Once you get through the values, click on save or commit to bin, save under a new file name, and continue as usual.
You can add the parameters to the XDF as well, so that you can make adjustments, if there isn't already a posted XDF with the fan parameters in it.
The man who says something is impossible, is usually interrupted by the man doing it.
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