jcjmw

I know when we increase the TB size or grind down the TB shaft we are increasing the amount of air into the engine and that helps increase HP. What would happen if we added spacers to the Surge Tanks (or underneath the surge tanks)? Wouldn't that be increasing the amount of air into the engine or increase the air volume in the surge tanks and help increase HP to our engine?

Does anybody know the answer?

I am hoping the answer is yes, b/c then that would be an easy way to increase HP to our engines.

AMG_RL

phenolic spacers will lower the heat transfer so yes, in theory it would increase hp but I'm pretty certain the gains are very minute. I was running a phenolic spacer on my Subaru but it was more for heat issues that hp gains.

jcjmw

Thanks, but I was thinking in terms of increasing air volume in the surge tanks. Would or wouldn't that increase HP?

AMG_RL

i see what you're saying, phenolic spacers are primarily used for heat dissipation so i kind of jumped the gun haha. with a larger or grinded TB it's not just about volume, but flow. when you grind the TB it allows the air to move more easily past the butterfly valve. Having that extra 3-5mm of volume gained in the tanks won't really do much if the air isn't moving. think of it like this, my friend fabbed a 6" CAI for my old car...it made no difference in power and actually increased lag compared to my 3.5".

personally I'd love to see some dyno numbers to see if they have any significant benefits, I'm mainly just speaking from personal experiences having data to back it up would be awesome lol.

jcjmw

ok, that makes sense. Thanks.

shardul

iTrader: (1)

did you receive the tanks

chiromikey

if you want to go through the trouble of making spacers to increase volume, they should be airbox spacers...

KLR CLS

Some people claim it helps with heat transferance to the IM, but nothing is going to control IAT save of some active cooling setup like the KC. Longer runners help make additional HP in NA motors, but for a positive displacement screw blower it's pointless. Air is already pressurized by the time it gets to those runners, and no further length/volume will do anything help.

jcjmw

Not yet, just checked mail.

grantwoodtx

Waste of time. Took mine out.

Forrest Gump 9

If anything I would like to "coat" the surge tanks with heat reflective coating (is there such a thing?).

AMG_RL

don't know if there is reflective coating,but there was noticeable difference when I ceramic coated my downpipe. STi's motors are know for #3 cylinder failure because of the heat of the turbo location. Don't know if I gained any power from it, but I doubt it would be noticeable unless you mate it to a bunch of other cooling mods. It kept the area alot cooler though