Estimated HP gains - bolt on mods and reflash?

[Dave-ROR]

Originally Posted by Max Schnell

This is why I mentioned ECU tuning for DI and revs in the same paragraph. There are any number of reasons that may have the power drop off after 7k. If the car can be tuned to continue to make power then raising the rpms makes sense.

Cams. It will need bigger ones. And likely valvetrain at least.

[Mitch]

Originally Posted by tranzformer

Power drops off after 7000rpm. Why would you want to increase redline unless you had other supporting mods to make it worthwhile?

Just because power ceases to increase (or even decreases dramatically) at higher rpms does not mean there isn't a mechanical advantage to staying in gear versus moving on to the next gear. I make these graphs when I get a new car. I'll make one for the BRZ when it comes out and we get some baseline dyno numbers. This is one I made when I got my Civic Si: Basically, if you have the baseline dyno, the tire profile/size info, the transmission gear ratios, and the final drive ratio, you can make a graph like that to determine what gear / road speed combination gives you the most force. If you know the coefficient of drag, you can take a pretty good stab at the drag-limited top speed.

[blur]

Originally Posted by Dave-ROR

You can put a filter assembly right over the ITBs. That's what I've used in the past. Carbon housing are just fancy, I'd rather either run just the filter with ducting going to it or just weld up an aluminum duct/box for them..

Or you can go RTR-X style

[Sully]

Wow that's sexy.

I wonder what the comparison numbers are for the filters inside the velocity stacks, mounted just outside and a traditional plenum over the ITBs.

[fatoni]

Originally Posted by Sully

Wow that's sexy.

I wonder what the comparison numbers are for the filters inside the velocity stacks, mounted just outside and a traditional plenum over the ITBs.

i dont know if it changes numbers. i would assume it just move them around

[old greg]

Originally Posted by Sully

I wonder what the comparison numbers are for the filters inside the velocity stacks, mounted just outside and a traditional plenum over the ITBs.

The numbers aren't likely to be good. Those tiny filters have very little surface area (read: restrictive), and them being down inside the velocity stacks interferes with the functionality of the stacks.

[Dave-ROR]

Originally Posted by old greg

The numbers aren't likely to be good. Those tiny filters have very little surface area (read: restrictive), and them being down inside the velocity stacks interferes with the functionality of the stacks.

Unless there's another stack underneath. I agree on the surface area.

[arghx7]

ITB's aren't going to happen until someone sources a complete electronic throttle solution for them.

It's likely that the intake ports will be restrictive above 6500-7000rpm.

[airboy808]

Ram air like the s2k aftermarket air boxes. That is going to be the ticket plus look trick.

[Homemade WRX]

Originally Posted by arghx7

ITB's aren't going to happen until someone sources a complete electronic throttle solution for them.

It's likely that the intake ports will be restrictive above 6500-7000rpm.

I won't agree with this just yet because of emissions. The faster the engine is turning, usually the more you're emitting out of the engine

Originally Posted by airboy808

Ram air like the s2k aftermarket air boxes. That is going to be the ticket plus look trick.

That's pretty much how it already seems to be laid out, however I imagine is has left some room for improvement.

[catharsis]

If it's anything like a k20 at most with bolt on's and a tune I expect 20 more HP to the wheels. This thing is probably pretty refined from the factory, so there won't be much more power to squeeze out of it with bolt ons.

[NA_T]

Replacing parts that are in there for emissions will be all that we can do.. should except some gains from that. Gaining 20HP out of that could be possible, but that will be about it..

[Levi]

[Caliban]

if turbo can't be fitted under factory bonnet..how did they put a turbocharged motor under the BRZ GT300? the bonnet of BRZ GT300 doesn't look much different than the production model.