Sluggish acceleration
 

For some reason my Z felt extremely sluggish today. Specifically my RPM keeps lingering at about 2k and I had to give a lot more gas than usual to accelerate.
Got to a point where I just kept mashing my pedal out of frustration.

I don't know if it's due to the weather(101F according to temp gauge) but I have driven in similar temperature without encountering this problem. In addition, my oil temp was only at 240F and I was able to hit 6k+ RPM so I know for a fact my car is not in limp mode. Last but not least, I have not done any mods or changes to my car so what the hell is going on.

Hopefully this problem doesn't persist til tomorrow.

i know what your talking about. its the heat. mine has done it since day one.....drive it tonight when it cools off and it will be fine. i believe its partially to blame on the shitty cali 91 gas, so when its so hot out the ECU pulls timming to keep the car from detonating.

Could be crap gas too and the ECU is compensating (for that) as well as high intake temps.

Funny you should post this as I was just experiencing the exact same thing yesterday.

I'm also in LA so I'm sure temps were the same...above 100F. Usually happens after long LA traffic sessions in hot weather. I understand your frustration as you can feel a definite hesitation if you get on the gas a bit after every stop light/sign.

I wonder if a CAI mod would help.

I have the Injen CAI installed.

Mine is stock and I notice that too on hot days. The weather makes a noticeable difference.

The ideal day is when it's cold and foggy. The oxygen is more dense, your car will feel like it gained HP. I used to hammer my Civic hatch with H22A, and it used to scream to let the VTEC loose in the mornings.

I'm not familiar with Injen, but, as far as I know, the only CAI system that pulls air from outside the engine bay are OEM and Stillen G3.

I figured the high humidity with fog would be bad?

Yeah... crap gas in vq engines will cause crappy performance.
Even in vq35. Also really hot weather will hinder performance.

Of course bad gas can make the car seem sluggish, but also check your MAP sensor. Since you have an aftermarket air intake, the MAP sensor connection could be loose. This was a common issue with the S2000 and an aftermarker air intake. (BTW, I cheated and asked my hubby about this one.)

^I highly doubt it will be the MAP sensor( or MAF sensor in the 370's case)....This is a problem that's plagued most VQ engines for a while. You'll feel this problem in many cars on hot days but in my experience it's even worse in the VQ lineup for some reason. Why the hell does this VQ run so damn hot as it is?? C'mon Nissan!

I feel it in my TL-S on really hot days also. I could probably run more laps in my Acura than in the Z though. Kinda sad, IMO, for a sports car to go into limp mode on a track after a few laps....

I used to punish my 350 so bad it used to fill the cabin with heat that no amount of AC could cool it down. I can't imagine what a higher output engine would feel like.

Wow, I thought it was just me but I've noticed the same thing. It's like it's starved for oxygen at low RPMs... L.A. has been ridiculously hot recently.

Another Los Angelino here. Car feels sluggish when it's hot.

Loss of power is normal in heat, however I don't think your driving is if you get your oil up to 240 in 101 heat with 7AT. I have to give mine a pretty good spankin' to get it to 240 in that same heat.

Well,my country,everyday is a hot day,so never have the chance to feels what is the power like in cold days.

I don't have this problem. The Stillen G3 intake and Stillen lightweight crank pulley did wonders for throttle and engine response. The other day it was 105F in Northridge and I didn't have any problems.

:happydance:

Is the crank pully noticeable that much?

sounds like just heat soak.

not good advertisement for injen if it's working no better than stock on a hot day though... you guys ever meansured your intake temps before and after the intake install?

Same here.

Loss in acceleration + throttle response

It isn't huge. Its more of the combined effect of everything together. Each mod improves everything a bit. After gaining a bit here and a bit there the total becomes noticeable.

The best way to gauge the difference is to have a stock one and a modded one side by side and try each out one after the other.

The crank pully is pretty inexpensive though so it doesn't hurt at all to get it.

I apologize and take back what I said. It just happened to me today. Ambient temps were about 106F, oil temp was about 250F. I was taking the onramp from Topanga Canyon Blvd to the 118 East. I stepped on the throttle in 3rd gear to like 50% and... not much happened. It was very odd.

Did you go on an extended drive beyond normal daily commute? I guess the reason I've never experienced this until recent is because I went on a prolonged drive going from Gardena -> Downtown LA -> La Crescenta -> back to Gardena. :/

Yes, a coworker and I went for a little lunch drive from Northridge to Porter Ranch, then to Woodland Hills and out on Mulholland Highway. The sluggishness was on the way back from Woodland Hills to Northridge (drove all the way down Topanga Canyon Blvd to the 118).

this happened to me today. 107 degrees in la crescenta, ca. me and a buddy were messing around in his 335 and my car would not be able to catch up at all. ive noticed it all day. no power what so ever. and i thought turbo cars were supposed to be effected more?

hot temp ruin sport cars :shakes head: it happens to my rx8 :mad:

His 335i was stock right? A 335 with 1 bolt on blows the Z out the gates.

and yes it was 100 degrees today in socal but my Z stayed at 180 temps with AC on full blast and running better than ever.

search for gas pedal delay and bogging.

http://www.the370z.com/engine-drivet...dal-delay.html

http://www.the370z.com/engine-drivet...irst-gear.html

I thought I was just imagining but I guess it is true. On really hot days the car does feel a bit different compared to cooler days.

After the Uprev fan adjustment, it helps A LOT with the first gear lag. I feel that the car doesn't bog as often, but it's still there on really hot days. My next mod will be a 25 row oil cooler, hopefully this cures it.

check your tire pressure

The oil cooler won't do much as the engine itself is still taking in hot air. I ran supercharger engine setup before and I can definitely feel a large different in engine response between morning on the track and hot 110 degree weather at the end of the day.

freaken spam post and useless advise.

Driving from LA, Glendale to La crescenta, I've always noticed that my oil temps hover around 190F-220F. Mind you, in our typical weather. However, does turning AC on help with temps other than your interior?

I never understood how the cold air intake works... considering that the whole thing is a metal tube, wouldn't it be worse on a hot day as opposed to a plastic airbox?

Turning on a/c doesnt help, and the theory behind cold air intakes, like the G3, is to relocate the intakes further away from the engine (cooler air).

:icon18:

Really dude? Its not a spam post its actually relevant advice. This happened to me recently. We know the Zs TPMS system is not really to be trusted. Mine is malfunctioning I need to take it to the stealership to get it reset.

My car was feeling rather sluggish, I normally check air pressure every time I fill up. Well I got lazy and didn't check it for about 3 weeks. I decided it was time and found that my rear left tire pressure was showing 10 PSI yikes! I filled her up and voila car feels brisk and perky just like before. Now I need to see if my tire has a puncture or something, prolly does for it to get that low.

Anyways sometimes these kind of issues are the most obvious problems and get overlooked because they are so obvious.

So like I said before, if you haven't checked your tire pressure recently go check it right now.

I had the Stillen 19 row "street" oil cooler installed. My acceleration problems, limp mode etc. where 90% cured. If the oil temp goes above 210 it starts to feel a little sluggish. This happens in traffic on hot days. If your moving and air is circulating through the oil cooler, the oil temp stays right around 195 even on hot days. I think the computer is the culprit. An UpRev tune is my next step in making this car run the way it should.

Uprev tune didn't really help cure the problem. I had the fans increased and it seemed to help a little but I still get that bog on accel when oil temps get to 180+

Attachment 104564 heatwave has been coming through here in SC, this was s couple days ago after work...same day on 40 mile trip home-lingered between103 & 104....yesterday was 102 & felt like I had a fat girl riding with me.... Smooth/ but bad air... Anyone know what max oil temp is...because engine stays below half (dots...) but oil temp creeps up to 240 & seems like car just loses power- still revs and everything/ but like 20-30 HP less. Y'all have a nice day.


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That was Tuesday the 16th.... Waiting on a cool down Attachment 104565


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Oil Temps
 

Mobil's website says their Mobil 1 syn is good up to 300 degrees. .???
107" wow. But it's always hotter on a crowded, slow moving fwy.