Rev limitations when engine is cold....
Rev limitations when engine is cold....
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.
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Re: Rev limitations when engine is cold.... (vibegt11)
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.
AKLGT1998 Subaru 2.5RS
Re: Rev limitations when engine is cold.... (trdvibe)
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.
Vibe GT, TRD springs, Progress bar, STB, Unichip, Borbet E 16x7.5, 225/50 Bridgestone RE750, beefed up grounds and battery bypass capacitors(had em laying around)
Re: Rev limitations when engine is cold.... (goodvibe)
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!
pics 10/2/05 http://photobucket.com/albums/a386/Faultline05/2003 Base Vibe, frosty color,moon n' tunes packagemods: Eibach sportline lowering springs,17"centerline forged wheels -silver excels -Goodyear Eagle F1 tires 225/50/17's-ACT HD clutch,2.5" exhaust,ES motormount inserts,up graded to 6 spd transmissionStafford Fabrication turbo kit: Garrett T3 turbo, FMIC ,SF BOV. ,Alcohol/water injection,and SF centerfeed fuel rail
Re: Rev limitations when engine is cold.... (Faultline)
Dang..i've been wondering about that. I knew it couldn't hit lift when it was cold...Thank goodness for remote starts..
2003 Vibe GT Lava"He inched his way up the corridor as if he would rather be yarding his way down it.""For a moment, nothing happened. Then, after a second or so, nothing continued to happen." - Douglas Adams...we all miss you
Re: Rev limitations when engine is cold.... (Jahntassa)
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
2008 Chevy Cobalt SS Turbo - Fun stuff under there somewhere 1998 Nissan Sentra - Sold2004 Pontiac Vibe - 107k and SoldCosmo CAI
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wicked1981
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Re: Rev limitations when engine is cold.... (TRD4reel)
I noticed this on my base Vibe also. Well now I know what it is.
2006 Pontiac G6 GTP3.9L V-6 240hp and 241 lb-ft or torque18" Aluminum, five-spoke, flangeless200 Watt, 8 speaker Monsoon sysChrome dual exhaust tipsLiquid Silver MetallicBorla Custom ExhaustDr. Speed Cold Air Intake
Re: Rev limitations when engine is cold.... (TRD4reel)
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)
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)
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.
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