2007 SUPERCHARGed Lacks Power in hot weather.

Over the last 3yrs, this thing is running worse every year. It constantly feels like someone dancing on the brake pedal while accelerating and maintaining speed. Hardly noticeable in the cold winter months. As the outside temperature increases, problem worsens. 100f outside temperature, it feels like I'm trying to tow a house. Engine temps have no effect. What the heck is going on? Never thrown a code.You can hear the rpms fluctuating with the stumbles and surges.

 

Have you cleaned the throttle body and MAF Sensor?

 

Replaced MAF and cleaned the throttle body. Made no difference.

 

You need to have a professional tuner or mechanic diagnose your vehicle.

 

I immediately turn to spark plug gap in my head, they are supposed to be iridiums, but I'd pull an easy one and measure it.

I had a supercharged corolla that hated the heat and it was fuel delivery that caused it.

Also hot in most engines means less output, it may be normal.

 

Dirty intercooler?

 

Get an OBD reader and start logging data. That is the only way you'll figure this out since descriptions are not helpful.

 

Do you have an AFR gauge?

 

I agree with the above. Get a logger. It does sounds like a fuel issue. Could be your fuel regulator or pump failing.

 

Sorry for going MIA on this. Just got back from vacation yesterday. I removed the belt from the supercharger and the problem went away. Any idea what's going on with the supercharger? Obviously an inconsistent boost issue and not fuel.

 

Have a 2018 accord 2.0 turbo pushing 350whp….around 80 degrees outside or lower, car is a train. Pulls strong. Once it’s 100 degrees outside and I do a pull or two, the car is slow. It’s the heat soak. Everything got super hot, so the car pulls timing. Normal thing on boosted cars

 

But it only started doing this maybe 3 summers ago and is progressively getting worse. It's been on the truck since new 07. It's not just slower in hot weather, it's like the boost pressure is fluttering off and on.

 

need a logger...cant just guess at it all and throw parts at it...well you can, but itll get expensive quick

 

How many miles since the S/C has been rebuilt, assuming you are past 100K? Taking the S/C out of the equation does not necessarily mean it is the issue. You may have inadequate fueling.
Are you running the proper spark plug for the S/C? What fuel pump are you running?
I'd get an OBD2 dongle like the KIWI 3 or similar and get an App that can monitor fuel trims and the like.

 

Supercharger was rebuilt 8-10yrs ago. I've always used the same plugs when replaced. Original factory fuel pump. I've found on my Scangauge where I can monitor AFR but not sure what numbers would be abnormal. I live at around 300' above sea level and recently spent a week driving around over 6000' and it didn't effect anything. Like I've stated before, the problem only shows up above 50f outside and progressively gets worse as the outside air temperature rises.

 

AFR should be 14.7 +/- under normal steady driving. Fuel trims are another one you might monitor.

But don't those SC need to be rebuilt semi-regularly? Sounds like you might be due for a rebuild and new plugs?

 

S/C rebuild cycle is 100K mi I believe. Or if it gets abnormally noisy.
I would 100% replace the Fuel Pump. Symptoms somewhat point in that direction. Not saying that is the ultimate fix but should be done. First check the pressure for a baseline. The pump is maxed out with a stock S/C. Once you drop a pulley size it is inadequate. Even if you don't notice an issue, a new/bigger pump will perform better under certain load conditions. Also the stock fuel filter is lacking and provides a vulnerability. You can get new kits from URD that add an external inline filter that can be easily changed at the recommended 30k mi interval.
The pump is in the tank which uses the fuel to help cool. If it's on the edge then those higher temps may be tipping it over the edge. Running at higher elevation leads to less fuel demand. You may have noticed peak boost being 1-2 psi lower than norm. That could explain why the issue didn't show up.
I have dropped the tank for replacement, timed it so it was under 1/4 tank for ease. This latest time I pulled the bed.
Hooking up a fuel pressure gauge is not difficult. There is an accessible connector in the engine bay. A few different test scenarios are needed to pull out any potential issues. Including under load conditions.

 

Either fuel or Im guessing its heat sink in your SC...

 

@1patriot4life

You should post your dilemma up in here.

https://www.tacomaworld.com/threads/trd-magnuson-4-0-supercharger-tips-tricks-and-mods.518932/

Plenty of boosted guys in near-mile high altitude and others in AZ that live in furnaces with higher ambient temps.

But you'll want to gather some data to help troubleshoot Eg, AFRs, psi, etc ...

If I had to guess, I'll be looking at that stock fuel pump.

 

Definitely check plugs. They tend to have a short lifespan in the SC.

Also, assuming auto but if manual the stock clutch can wear out fast.

Belt slip could be a thing. Much belt dust or glazing?