Pushing Coolant, Knock?

[daren_p]

I was just curious, I've had knock issues ever since I installed my cams & I did swap to ARP headstuds at the same time without removing the head. The other day a buddy was behind me & said when I went WOT he saw white smoke. So I started to wonder if my head gasket isn't sealed properly & is pushing some coolent under a certain amount of boost. I was just wondering if this is what is actually happening could that be a source of knock?

I haven't done a compression test but will in the near future but I haven't noticed any other clues such as oil in the antifreeze. Also wanted to verify the head gasket would be the only source if I am burning some antifreeze?

 

[vexixx]

Does your car overheat at all or run any hotter?

 

[daren_p]

It doesn't over heat but its ran hotter ever since I installed the fmic a few years ago. During the summer I previously saw temps in the 200-206 range most of the time, with 203-206 being what I saw most. The strange thing I have noticed this year is once the car is fully warmed I've seen cruising temps as low as 193 & as high as 213. Previous to this year it was pretty rare to see it hit 213 & would only do so on the hot, hot summer days.

 

[Rice Over Wheat]

That seems hot for canada.

 

[Locke]

I'm not the 4g63 guy, but I offer my thought anyways.

On many vehicles, when aggressive cams and springs are installed, the ECU pulls time as it interprets noise from the valve-train as knock. I don't know how aggressive FP1's are. Can you desensitize knock input with dsmlink?

 

[daren_p]

I'm not the 4g63 guy, but I offer my thought anyways.

On many vehicles, when aggressive cams and springs are installed, the ECU pulls time as it interprets noise from the valve-train as knock. I don't know how aggressive FP1's are. Can you desensitize knock input with dsmlink?

Yes I can desensitize knock, but no need to as it doesn't seem to be mechanical knock & it only happens under heavy boost.

Kevin- Oh c'mon we don't all live in igloos up here But yeah were currently only about 70 deg. Before the fmic I use to run 196 all the time on cruise in the hot summer. Coolent is a 50/50 mix of water & anitfreeze with the royal purple water wetter. I thought maybe the stock thermostate may be giving me an issue so I picked up another Mitsu one & still saw the exact same temps. My core is fairly large & I kept as much of the factory ducting as possible when I did the install but I haven't added additional ducting as of yet.

 

[Rice Over Wheat]

Really I thought Canadians were born with hockey sticks and love bacon (ham). Oh I kid our friendly neighbors up north.

Well I'm sure you've seen my several threads on cooling by now if you want to run in the 160s!

 

[daren_p]

Really I thought Canadians were born with hockey sticks and love bacon (ham). Oh I kid our friendly neighbors up north.

Well I'm sure you've seen my several threads on cooling by now if you want to run in the 160s!

Ya have seen the threads but defently don't want to run in the 160's. I believe you won't see full timing advance at that temp & the ecu doesn't go into "learn" mode for your fuel trims (not high enough operating temps) But I do wish I could keep it under 200F so I'm not seeing the 1 deg timing being pulled for over 206 F. That will be the next project.

Back to my origional question, if I was infact pushing some coolent under boost could this be a source of knock? Don't tell me I stumped all you wisemen

 

[Rice Over Wheat]

My trims are already tuned within 3%. As for timing, I'm going to ask that question on dsmlink forums. Maybe Thomas can confirm if the ecu code restricts timing advance based on low temps. I never heard of that.

 

[daren_p]

My trims are already tuned within 3%. As for timing, I'm going to ask that question on dsmlink forums. Maybe Thomas can confirm if the ecu code restricts timing advance based on low temps. I never heard of that.

I believe it works the same as when your coolent temps get to hot. If your a certain amount to low you see 1 deg less advance & then if your even lower you see 2 deg, etc. I believe I have a thread from Thomas on this at home but its been awhile since I've read it so I may be off. I'm thinking around 172 it what is classified as proper operating temp for the ecu but this again could be off.

 

[Rice Over Wheat]

I think you may be talking about trims or open loop mode for a 1G. On dsmlink wiki Thomas posted all the coolant temp adjustments in the ecu code and it only showed timing gets pulled for hot temps. But I posted a thread to double check on this to make sure.

 

[daren_p]

I think you may be talking about trims or open loop mode for a 1G. On dsmlink wiki Thomas posted all the coolant temp adjustments in the ecu code and it only showed timing gets pulled for hot temps. But I posted a thread to double check on this to make sure.

You never know, I could just be making things up. I am getting old, I've heard you tend to do that when your old

 

[Rice Over Wheat]

You may be right and I appreciate pointing that out because I'm running 160s temps -- blazing new trails for DSMs everywhere!! So it's good to find out how this affects performance if it does.