Slugish Cold Start Issue

[AntonRx7]

I have a 93 R32 GTST its auto.

In the morning it runs really really slugish up to 3000rpm for about a mintue or so although if you go high the turbo comes on like a switch, after its been about a minute or so its fine. I have a GCG turbo rom tune gtr injector 040 fuel pump FMIC exhaust and pod.

It has only been happening since the tune I had although tuner said all the air fuel ratios are all good and at first thought it was the auto, i also thought this however i tried to rev it in neutral and it revs very slow too just like how it runs.

Anyone have any idea wat it is?

I know to drive slow when its cold but yeah this is very slow and realy have to be carefull with traffic sorta slow

[paulr33]

its designed to do this. when the engine is cold (water temp sensor) the ecu retards the timing and adds extra fuel to heat the engine up. during this stage the engine will feel a little flatter and lack response until its heated up. once water temp is around 50deg then its goes to minor level corrections. 80deg is ideal water temp with no correction at all.

[paulr33]

also bearing in mind everything else on the car is cold too, diff, gearbox, clutch, bearings etc so its a good thing it lacks response and doesnt come on full stream ahead, prevent bearing / seal excess wear/damage

[AntonRx7]

yeah i realise it would a bit just since tune its gotten a lot lot slower. Or is the car just compensating for the more power it has now.

[paulr33]

nah it shouldnt matter how much power it has got. the maps which tell the engine what ign timing and fuel parameters to add for the low load / cruise areas (around 3000rpm ish) wont be any different to your max power tune map areas. the ecu has correction "maps" or settings. these are based on water temp, battery voltage, knock values, air temp (if supported), airflow value and so on.

so based on certain environements the engine is dealt dynamic changes around its environment.

ie when the engine is cold is runs less conservative timing and runs more fuel then when its fully warm. when the engine picks up lots of knock it backs off the timing to protect itself. when the engine detects too much airflow (ie: failed wastegate spring) it protects itself by retarding the timing a lot and dump fuel to richen itself up and try and keep it as safe as possible. when the airflow meter doesnt measure any voltage is does a dynamic rev limit change to 2500rpm. it assumes some air is coming in to allow the engine to run in limp mode but it wont let you rev past, this prevents you from possibly leaning the engine out and causing damage

[J_R32]

i also have a rb20det auto R32 and mine does exactly the same thing, very annoying, but once the temp gauge hits the "warmed up" point, you can feel the engine suddenly pick up power. i think the fact we have auto prob "exaggerates" the sluggish feeling.

[RB30-POWER]

sounds stupid, but what viscosity oil do you have in the motor?

its suprising how much drag, the wrong oil can put onto a motor. always more evident when cold of course.

[AntonRx7]

yeah i just thought it was a bit odd since i have only ever noticed it since tune of the standard computer. Maybe something was fixing in the computer which is why it didn't do it before. Oh well supose ill deal with it. It is a good thing i supose just can't cross the road unless i have a big gap

[race_snooze]

check for fouled plugs