Heres the deal.
I drove down to a local mexican food place. Combo plate with tongue and beef fejitas. Less then two miles from my front door. Not enough for warm up.
Then to redbox across the street at 7/11. As I'm waiting, I let her idle to burn off water in the engine.
She got ridiculously hot. Didnt touch red on the factory gauge. Those gauges are junk anyhow. They're better then nothing but still suck.
The getting hot crap is stopping. Shes got a 180 degree themostat.
Heres what I did. I changed the fan turn on points in the ecm. The values in the pic are the new settings. My red neck self had visions of installing a switch on the dash, controlling fans. After I took a breath....forget that. This thing is automated. Let it do the work instead.
To compare the new settings to the old. Heres how much I dropped the threshold to when the fans come on. Do a little reverse math and thats what GM had it set at. Everything is in C. 185f for #1 fan. 190f for #2 fan are were I want temps to be when the fans come on.
Lasered the themohousing after the fans came on with the new settings. Temps shown in F. This is the temp after being cooled by the radiator. (Reverse flow LT1)
Lasered the radiator on the intake side. This is the temp of the water coming out the engine.
Heres what the gauge reads.
Now my fans are doing their job. I have no clue why GM set the turn on temp at 131 Celsius. That's not gonna work in a Texas summer. Unless changing head gaskets and milling heads are your thing. You gotta be careful adjusting even the smallest thing. The fan times between fans 1&2 can't run at the same time. Fan two shouldn't come on during the same temp as fan #1. My understanding is it confuses the ecm causing it to change other variables. Make no mistake, tuning is in-depth.
I'm slowly convincing myself to buy another set of heads. It's like $200 for two out at the junk yard. Early thick walled' jobs too. Somewhere GM cast an extra two pounds in the early heads. Heads closer to 98 are thinner and lighter.
I've ported heads before and those were cast iron. It's really easy if you're careful. Reports say HP increase is around 40 on ported LT1 heads Not bad for $200-300 bucks.
"Sent from a puff of smoke"
I drove down to a local mexican food place. Combo plate with tongue and beef fejitas. Less then two miles from my front door. Not enough for warm up.
Then to redbox across the street at 7/11. As I'm waiting, I let her idle to burn off water in the engine.
She got ridiculously hot. Didnt touch red on the factory gauge. Those gauges are junk anyhow. They're better then nothing but still suck.
The getting hot crap is stopping. Shes got a 180 degree themostat.
Heres what I did. I changed the fan turn on points in the ecm. The values in the pic are the new settings. My red neck self had visions of installing a switch on the dash, controlling fans. After I took a breath....forget that. This thing is automated. Let it do the work instead.
To compare the new settings to the old. Heres how much I dropped the threshold to when the fans come on. Do a little reverse math and thats what GM had it set at. Everything is in C. 185f for #1 fan. 190f for #2 fan are were I want temps to be when the fans come on.
Lasered the themohousing after the fans came on with the new settings. Temps shown in F. This is the temp after being cooled by the radiator. (Reverse flow LT1)
Lasered the radiator on the intake side. This is the temp of the water coming out the engine.
Heres what the gauge reads.
Now my fans are doing their job. I have no clue why GM set the turn on temp at 131 Celsius. That's not gonna work in a Texas summer. Unless changing head gaskets and milling heads are your thing. You gotta be careful adjusting even the smallest thing. The fan times between fans 1&2 can't run at the same time. Fan two shouldn't come on during the same temp as fan #1. My understanding is it confuses the ecm causing it to change other variables. Make no mistake, tuning is in-depth.
I'm slowly convincing myself to buy another set of heads. It's like $200 for two out at the junk yard. Early thick walled' jobs too. Somewhere GM cast an extra two pounds in the early heads. Heads closer to 98 are thinner and lighter.
I've ported heads before and those were cast iron. It's really easy if you're careful. Reports say HP increase is around 40 on ported LT1 heads Not bad for $200-300 bucks.
"Sent from a puff of smoke"
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