so i just bought a jwt and i put it on today and it seems liek it is bogging down around 3500 and then jsut taking off....has anyone had this problem before or know if there is a fix? thanks

 

was your car warmed up before you tried taking off???

 

like tried taking off the old intake when it was hot or what do you mean

 

ok mine it lags at low end when the car isnt warm.....so im saying start the car let it warm up get to the average temperature on the temp gauge then try taking off in it, that should make a difference....like dont just jump in the car and take off really fast with a cold start let the engine heat up get its fluids running and then try taking off wot and see what happens

 

ooo i see...urs does it all the time though? ive never had a cold air intake work like that..btw mine was semi warm when i put it on

 

ya did you try it? mine does it all the time when the caris cold

 

i havent had a chance yet...i think its getting better i reset the ecu and i think it might have helped...i know for a fact the exhaust is breathing better i can hear it already...ill take her for a spin when i get out of work today.

 

What you're feeling is pretty normal for an open element intake in the warmer months. Basically what's happening is the underhood temps get into the 140-155 degree range when you slow down and come to a stop in 80+ degree weather. When it's time to accelerate, the intake is sucking in ultra hot air which then the MAF dials back a lot of timing and adds a lot of fuel to keep the engine from detonating. The stock intake tract sealed most from underhood heat so at a stop, the air entering the intake is only about 20 degrees warmer than ambient whereas the pop-style intake will be sucking air that is 60 to 80 degrees above ambient. Additionally, the open element intakes are not sealed therefore they do not pressurize (slightly) at speed like the OEM intake and the shorter intake tract impacts throttle response because air flow is a bit more turbulent at the MAF at lower rpms (essentially the MAF gets air flow readings that bounce a round). This lack of pressurization, turbulent air flow, and intake heat makes the throttle and engine feel rather laggy below 3500-4000rpms. What you feel is a rather gutless motor that comes alive in the upper rpms as the heat clears out of the engine bay and the air flow becomes more laminar.

Your observations have been documented for years on this site and my350z.com. It's also why many people refer to aftermarket intakes as hot air intakes and also why a lot of people remove the aftermarket intakes after some time. Many that have had both say stock, while quieter and less aggressive sounding, feels stronger and more punchy.

 

^+1, used to have JWT, although it sounded nice and felt strong at low temps it wasn't worth the constant loss I was getting in 365 day LA hot weather.

 

thanks for sharing that i was doing a search and found nothing....it makes sense though hopefully with a new grill and front bumper the air will come in colder and off set this a lil....if not i still needed the ztube and i always have the drop in k and n....i was just commenting so i didnt mess anything up being lean or what not

 

Wow, finding out all sorts of negative things about these intakes. Whistling and now this.. Glad I checked!

 

you'll get whistling with almost every aftermarket intake not just with the JWT pop charger

 

I have a z-tube and jwt pop charger and I love it.

Was driving through a tunnel yesterday doing like 60 in 3rd.... sounds so hot.

 

so i take it the JWT charger is the best for are cars? i dont here much about the z-tube kit with the stillen charger..... why is that? they bad?

 

Yeah by "these intakes" I meant all the CAI ones not just the JWT...