HP Fluctuations based on Engine Temp
 

Ok I am getting very frustrated and was wondering if anyone has heard or experienced this before and maybe knows what it is. For starters I have Stillin Gen 3 CAI, and since the installation its gotten worse.

I notice pretty major fluctuations in HP which feel like possibly 30+HP swings. I'll turn on the engine on a cool night and seriously put my *** in my seat for maybe the first 2-8 minutes ... but the same cold night after the engine heats up and the oil is at 200-220 it bogs down to a very noticeable point.

At first i thought it was the CAI actually sucking up hot air from the radiator (still a possible culprit) but that wouldn't support all the supposed gains.

I really want/need to get the car dyno'd but has anyone else heard anything like this? Any possible reasons? its a strange issue. I do live in south fla so cool night is 50's... and thats still rare but its even worse when the temp gets higher.

Thoughts?

Yea, stuff gets hot and the car feels sluggish. Even with turbos, I have trouble getting it to spool up. I notice the throttle feels like it opens up more when I disable VDC.

http://www.the370z.com/engine-drivet...-response.html

I have the same temperature dependent sluggishness. Ideal oil temp seems to be about 190, progressively weaker above that, and at 220+ it really slows down. I read a passing reference in another post to the ECU pulling off power at higher temps, but haven't seen any other verification of that.

Added an 25 row Z1 oil cooler a couple of days ago to hopefully address this.

No its air temp from maf

the ECU starts reducing power around 200 degrees, more as you go up. Its extremely noticeable even on a stock car. You dont have to hit full oil temp "limp mode" before it starts to pull back.

UpRev will verify this if you wanted a second opinion. I have touched on the topic with them a few times.

So what's the fix? Any oil cooler?

I have an oil cooler, but temps will still hover around 200-210F with turbos. I don't know what it's like for N/A application though.

What do you mean? So you do think i'm getting hot air pulled in? I swear since i put in my CAI my engine has actually been running hotter! Highway driving with outside air temps between 60-80 keep my car running between 210-220. So the ECU DOES pull back power at temps over 200? CRAP! SO NO WONDER i never have full power besides at start up.

My car is completely stock with the exception of the Gen 3 CAI. The inconsistency of the car is so annoying... ESPECIALLY when i want to show it off!

How can i get this checked, what can i do! help!

Normal. Can be tuned around at increased risk of pre-ignition.

There is a thread that mentions you can throw on most (all?) exhaust mods and not need to retune the engine, but if you put on a CAI in conjunction with one or more exhaust mods, you have to retune because it leans out the AFR mixture.

Not sure if this will be all that useful in your case, but maybe you are running a bit lean and causing extra heat that way.

If that is the case, you can get tune the engine to fix the AFR problems.