just installed hks and FI hfc's...i definatly fell the low end loss already...but when should i expect a little gain

 

You should feel it within the next 2-3 days. Wont be much though so dont get your hopes up

 

i installed FI metallic cats + FI exhaust and felt no low end loss - in fact my g-tech rr measured an immediate gain in the 0-60. haven't had time to go do a 1/4 mile run on an open stretch yet... waiting for the 500 mile mark on the exhaust.

i would think the HKS would have better low end gain because of smaller piping - but I've never actually seen a dyno of the HKS.

 

some peoples' butt dynos don't function as well as others

 

i didnt know there was a built in waiting period before the hp/torque kicks in ?? im confused

 

Ok, now that's funny! It's his girley undies........

 

Not until you get it tuned, then immediately.

 

It's only because you thought the HKS would give you the feel of my car

 

Interesting!!!!!!!!!!!!!!

 

should i do an ECU reset????...or wat do i do...cuz im gettn more mods later probably so a tune is coming later

 

To make the most of it, some tuning is in order.

The lower rpm loss is associated with the reduced exhaust velocity from the larger pipes and HFCs. The larger piping greatly reduced the gas velocity in the lower rpms which doesn't allow the gases to get pulled from the heads effectively. The end result is a slower in the lower and midrange rpms.

IMO, if you don't feel much increase right away and you actually feel the loss, you can be pretty certain it's not going get better with time. I think a lot of people that end up feeling increases days later are actually get used to the reduced power and they are confusing the additional noise with an increase in power (ie the power of suggestion).

 

Right on point, no real gains measurable, just audible.

 

If you look at the Fast Intentions web site and the dyno plots there, you'll see that the combination on our test car, as well as others, have shown that there is only a drop from about 2150 - 2300 - only 150RPM worth of drop - and gain EVERYWHERE else.

The HKS system was not designed to work with HFC or testpipes, so your augmenting it's design. The FI system, its testpipes and CATS are all designed to specifically compliment each other...and that's why the combination works best as well.

I'm not really trying to sell you guys - just educated why they work better in some cases than others. The big pipe-less back-pressure power loss theory only works in mismatched and poorly designed systems - not specifically match tuned systems - like the FI.

Rick