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Rev limitations when engine is cold....
Posted: Fri Jan 16, 2004 2:38 pm
by vibegt11
When I mean cold, I don't mean zero degrees....here's the deal.If I fire up my Vibe GT, and immediatly hit the road and hammer down, the engine cuts out at about 6000 rpms. It could be 90 or 20 degrees outside. Reminds me of an Indy car and it's turbo blow off valve opening because of HP restrictions. After the engine temp gauge reads anything above bottom, it lifts and punches like mad. Is this ok? My 1992 Olds Acheiva SC with 190 HP never did this. AND the clutch on that ride was still A OK when I sold it with 60K on it.
Re: Rev limitations when engine is cold.... (vibegt11)
Posted: Fri Jan 16, 2004 3:09 pm
by AKLGT
yes, i believe there is a rev limiter of some kind that stops the engine from going over 6K rpms when the engine isn't warm. it's to prevent engine damage... or something like that.
Re: Rev limitations when engine is cold.... (trdvibe)
Posted: Fri Jan 16, 2004 8:27 pm
by goodvibe
That's it, they don't want the extra strain of lift before the oil can do its job. It will engage before everything fully up to temp but not until things are flowing. Great feature.
Re: Rev limitations when engine is cold.... (goodvibe)
Posted: Sat Jan 17, 2004 3:14 pm
by Faultline
Isnt ther something about lift engagement that relies on oil pressure????anyway, its great that there are safety features to save us from ourselves...hmm..it always better to error on the side of caution though, I dont think I would ever rev any motor so high when its cold..metal expands when it heat up...and so you might say that spec clearances are different when the motor is cold.....I never drive my turbo motor when the motor is cold...and if i am in a hurry, and drive cold, then I do not boost it till its good and warm...i mean geez..let everything get good and oiled up before you must go into flight mode!
Re: Rev limitations when engine is cold.... (Faultline)
Posted: Sun Jan 18, 2004 4:14 am
by Jahntassa
Dang..i've been wondering about that. I knew it couldn't hit lift when it was cold...Thank goodness for remote starts..
Re: Rev limitations when engine is cold.... (Jahntassa)
Posted: Fri Jan 30, 2004 11:21 am
by nismo
Well, I got the automatic. So, when the car is on a cold start, the car doesn't let me go over 4000 rpm's, which I like. I have never seen any other car do this. I love this feature. I was actually thinkiing about bringing this up, but I guess someone got to it before me. Inder Singh
Re: Rev limitations when engine is cold.... (TRD4reel)
Posted: Fri Jan 30, 2004 11:25 am
by wicked1981
I noticed this on my base Vibe also. Well now I know what it is.
Re: Rev limitations when engine is cold.... (TRD4reel)
Posted: Fri Jan 30, 2004 5:20 pm
by Vibe
I personally don't like it because the freeway is right outside of work and I get run over when I first get on because acceleration is limited. Blending in on I 94 requires a lot of throttle with all the nuts going 80.James (Vibe)
Re: Rev limitations when engine is cold.... (Faultline)
Posted: Fri Jan 30, 2004 9:44 pm
by joatmon
Quote, originally posted by Faultline »Isnt ther something about lift engagement that relies on oil pressure????I asked that in a unichip thread somewhere, curious how something like unichip could change the lift engagement rpm. Lift is not engaged when the overall engine oil pressure reaches a certain point. Instead, when the power train control module (PCM), or ECU reads the appropriate RPM, it causes a valve in the engine to open, and that applies the oil pressure to whatever engine internal part that kicks it into lift. So, although oil pressure is used to engage lift, it is a very localized oil pressure and is switched on and off by the PCM. or so I am told
Re: Rev limitations when engine is cold.... (joatmon)
Posted: Sat Jan 31, 2004 1:05 am
by GlenW
This is why Toyota engines last longer. It mainly to prevent damage to the engine as stated in your owners manual. Which I'm sure everybody has read.