Has anyone tried putting on large throttle body. I looking to improve low end accelaration. Any help would be apprecated.

 

Pretty sure you will be limited by the inlet of the intake manifold. Cams or long runner intake would net some gains, but going to be small as its only 1.5L motor.

 

Ok Thanks.
i done alot to help performance. Axle back exhaust replacement, tuner chip and short ram intake. They help upper rpm range. But sluggish alittle on dead stop full acceration. Slower then my 2017 honda fit off the line.

 

Easiest thing to do is remove CAT, but that has is own consequences. Short rams are only good for high RPM range as you are finding out. Long ram will get you back the low range, or stick with stock as it was engineered to give you best of both.

 

The stock air box was to restrictive on the air flow. Made the car sluggish in low and high rpms. Same as the exhaust was. I keep that information in mind. I just need to figure all what they changed from the 2017 model to the 2020 model.

 

What airbox did you replace with? Hopefully not a Hot air box.

 

I installes HPS short ram intake and ducted the orignal air intake that pulls from the outside to give cooler air to the intake

 

Yea...that's a hot air intake. Contrary to tuner belief stock would be significantly better.

 

Im running one from a CR-V… and im currently working on one for another buddy….
it works pretty well… and if you have a KTuner it will be better 😎

 

Right now im using Thorson's tuner chip. Does this kit help with the low end throttle response. I had 2017 honda fit and that had better low end response then my 2020.

 

Yea, my 2020 has less get up a go on the low end. Tough finding anything aftermarket for this car performance wise. My 2017 had more low end response and it was stock.

 

Most of the mods you have made are for more max power in high end, which often makes it thin in low end. To get the same low end performance you had in your 2017, you need to go back to stock.

 

The fit as stock was less responsive. Then it is now. Making the engine breath more has helped. But it needs more.

 

I have a hard time believing it was less responsive stock (across the board). Honda has some of the best engineers working for decades to invent new technologies and to squeeze the most they can out of 1.5L. You and i or a any run by night shop can compete with that. If you want high end power you have to sacrifice down low. The same is of the opposite.

 

For the 2020 model honda dropped 3hp from the 1.5. Any stock intake is designed to be quite from the factory. This is cause the air flow is restricted. Less air going into the engine less power and effect both the low and high end. Honda fit were designed for fuel efficiency. To get that honda use electric steering instead of power steering ran by the motor. The intake and exhaust are made restrictive to help with fuel efficiency and make run quite. To your dismay I drive the car every day. And what I have done to the car I have notice improvement in both low end and high end. If we're talking about a type r then yeah they designed it for performance.

 

Designing an intake manifold involves optimizing airflow and pressure waves to maximize engine efficiency and power. Key considerations include runner length, plenum volume, and the shape of the manifold's cross-section. These design choices influence volumetric efficiency, which is the amount of air an engine can intake compared to its cylinder volume.

Bigger isn't always better. Brush up on thermodynamics and computational fluid dynamics and you'll understand how all those parameters need to best corelate.

 

You can use the larger TB with the spacer… it will work … but as someone said… the real restriction is the bottleneck on the entrance of the IM… which has the EGR inlet also….

I eliminated mine and blocked off both parts of the EGR (on the head and on the IM…

BUT i have a KTuner and could disable the EGR code…
so: it would work… YES!! But for that mod to be more effective you’ll need to either change the manifold ( i heve the RZCrew one (and asked them to bore it to 61mm… as the TB I installed)) and have any engine management to be able to tune it and disable codes…