[E90Vader]

As I'm new to the tuning scene I have some basic questions that I have not been able to find straight awnsers to via searching ETC

Lets take a look at your simple bolt ons. Down pipe, Exhaust, Intercooler, DCI
By them selves I understand they don't give nearly as much HP as quoted on the site, however once the vehicle is tuned Ie GIAC / Vishnu / JB, those bolt ons start showing better HP Gains.

For example, AFE CAI I have heard runs about 30BHP, an Intercooler runs about 25BHP, DP runs about 20 - 30 BHP, exhaust 10bhp give or take.

Now if this is the case how come it is not linear, Ie you have a vishnu tune which makes your car 380bhp, you add a CAI you should get 410hp, then you add an intercooler and vuala you have 430 - 440 hp, then you add DP and you have 470 hp and with exhaust you have 480 hp.

However from what I have read this is not even close to your actual numbers, you may in fact have around 420bhp with full bolt ons.

Same for GIAC ETC

So what am I missing hear? If each mod is proven to run about 30bhp when combined with a tune why don't they all add up to an additional 90 - 100hp over and above the tune?

[Litos]

Originally Posted by E90Vader

For example, AFE CAI I have heard runs about 30BHP, an Intercooler runs about 25BHP, DP runs about 20 - 30 BHP, exhaust 10bhp give or take.

Originally Posted by E90Vader

So what am I missing hear? If each mod is proven to run about 30bhp when combined with a tune why don't they all add up to an additional 90 - 100hp over and above the tune?

first of all, if you didn't believe that an intake is gonna give you 30hp then you'd probably have more accurate numbers.

second of all, if you're interested in ONLY peak numbers, than please DO NOT mod your car......

intake = 10hp
FMIC = 15-20
DP = 15-20
tune = adds more boost but "should" give @ 40whp just by itself.

add that up..........

[Litos]

just so you know, i never got to dyno my car completely bone stock.

i did however dyno it on stock boost with fmic and dci.

then i dyno'd with JB4 with the same mods.

then i dyno'd with Cobb with the same mods.

from stock boost with fmci and dci i picked up 65hp and 90ftlbs.

i would feel safe saying that my car would probably probably dyno @ 15-20hp less without the fmic and dci.

[E90Vader]

Thanks for the quick reply.
I should start talking WHP in the tuning community, I do understand where you are coming from with that.

I guess BHP is still fresh in my mind as friends, family, co-workers only understand BHP and not horse power at the wheels.

It's easier for me to understand the power gains as I've never had experience throwing a car on a dyno.