Heat Shield for the Air Box?

[dsmack]

Probably no effect simply because the air moves through the box so rapidly. Air doesn't stay in the box long enough to absorb any heat except for when the engine's not running.

I think it has a chance of being effective at lower throttle openings (cruising). The best chance for effectiveness is when slowing/stopping in traffic. Or when waiting in line or at the starting line of the drag strip

My plans to test insulating foam for blocking air pathways between the engine and the intake openings have a better chance of being effective under acceleration. Now that the sides are opened up wide without the little backward-facing funnel, the modded air box has a much better chance of sucking in hot air from the engine area. I should probably test the foam idea first, settle on the best results with that, then add the heat shield.

UP ~ I highlighted one of your comments with which I agree completely. I had not responded before, because I applaud your efforts to extract a "little extra" through mods and tuning. Years ago, during my "mis-spent youth" period of life in So. Cal, I spent considerable time, effort and money playing with Formula Ford open wheel race cars, running at the National level for a couple of years after a few fun years at the Regional level. At that time, the class was designed around the 1600cc Cortina 4 cyl engine, and was closely monitored for illegal internal mods. That left induction and exhaust as two avenues to additional HP/Performance (legally)

I'm afraid that our FJRs present a difficult situation, with the airbox living right in the guts of the engine, and that may be made worse by the ambient temperature of the air behind all the fairings... Not to say gains may not still be possible, but I'm wondering if a combination of insulating the remains of the air box as you are thinking, coupled with a cold air intake system of some type might not be the final solution?? The fluid dynamics of a cold air intake system are complex, with the added length of the needed runners suffering an offset in gains by the added friction losses in the increased length.

Even on the Forumla cars, where we had the ability to place any sort of ram air duct above the engine, beside the engine, etc, it was very difficult to get repeatable results on a dyno... The fact that the air induction system on the Feej is contained between your knees certainly adds to the complexity!

Good luck in your quest, and please keep us informed.

Most of all, when you get it all done... Ride Safe!

Don

 

[Wicked Webby]

Wrap it in tinfoil and try it.
Their seems to be a few guys trying things in the quest for extra power. This, scoops in the side panels... WHY? I can only shake my head. Opening up the air box no doubt gains you a couple of hp at the top end. If you reprogram the ECU... thats a whole lot of work for basically a couple hp gain where it does no good at all. Nevermind the potential LOSS in the midrange where it's most needed, and the risk of reducing the weatherproofing of the stock system.

As one who had to cut a plastic pop bottle to put over his snorkle style intake because it started raining heavy just to get home... it's just not worth it.

But hey, your time, your money, your bike. Go nuts.

If you already have something in place like the Motty AFR Tuner to automatically adjust fueling to match AFR targets even if you change exhaust/intake (like I do), then spending an extra $15 and some time on modifying the air box is not a "whole lot of work". If you already have the air box off the bike to do this mod, then it's not a "whole lot of work" to also add a $25 heat shield for a couple more potential ponies.

You're also wrong on the hp gains/losses. There's actually quite a significant gain in the mid-range (4k-5k RPMs) as proven by Wicked Webby:

(lowest tq/hp graph is stock + Remus Hexacon slip-ons; highest graph is same bike with modded air box and adjusted fueling)

This air box stuff gives much better hp-per-$ than aftermarket slip-ons.

Hahahahaha!!! Sorry just caught this one.......

Bungie clearly hasn't kept up with what is hot and what is not....

The Dyno proven Recipe:

https://www.fjrforum.com/forum//index.php?s...=102302&hl=

Gains all across the rpm range.

There are sum in, some out, and some that just don't know about...

The know.

WW