want to increase hp 2005 bmw 325ci

[slavic1996]

hello guys i am looking to increase hp on my 2005 bmw 325ci without spending a lot of money i was told i can upgrade my injectors buy not sure if it will damage my viehcle i know i have 180 cc injectors witch is stock, if i upgrdae to 250cc will it make a difference. thank you in andvance

[Pelican Parts]

Hello and welcome to the forum! Increasing the size of your injectors will not increase your HP at all; you'll like be running way too rich; which will cause other issues. There's not really an "inexpensive" way to up the HP as the 325 was built as a economy DD. What are your goals with it? Are you planning on tracking it? If the end goal is just to have a fast car, I would save my money on aftermarket expenses and save up for a car that is more tune-able. Just my 2 cents.

[All2kool]

hello guys i am looking to increase hp on my 2005 bmw 325ci without spending a lot of money i was told i can upgrade my injectors buy not sure if it will damage my viehcle i know i have 180 cc injectors witch is stock, if i upgrdae to 250cc will it make a difference. thank you in andvance

You'll need to trade it for a Porsche.

[slavic1996]

im using it as a daily driver just wanted a little more power but thats what i figured, thank you.

[slavic1996]

Hello and welcome to the forum! Increasing the size of your injectors will not increase your HP at all; you'll like be running way too rich; which will cause other issues. There's not really an "inexpensive" way to up the HP as the 325 was built as a economy DD. What are your goals with it? Are you planning on tracking it? If the end goal is just to have a fast car, I would save my money on aftermarket expenses and save up for a car that is more tune-able. Just my 2 cents.

will uprgading headers and adding a cold air intake bump it up around 15 hp

[Honolulu]

I'd doubt any claim to that effect, unless it included remapping the ECU. Remember the ECU is set up to play with all the stock members of the team. It will continue to play, within the limits of its ability, if some members are changed, but 15 hp is a bit much to ask.

The increased noise that CAI and headers make is sometimes mistaken for additional power, but the ECU will still see the engine data and compensate within the limits of it's programming.

MAYBE for more acceleration and a slight loss of top end speed (which top end most of us seldom, if ever, use) you can consider a diff with a higher ratio, or tires with a smaller diameter. But it's sure gonna look funny with skateboard wheels on the back.

[dhurley34]

If its a manual, change the diff to a 3.46 from an auto and call it a day.

[legoman67]

Sell it and buy a 330 or M3...

BMW didnt leave untapped power in these engines. The only way to get real power is to go forced induction.. but you'll spend more then you could buy an M3 for to do forced induction properly.

[Pelican Parts]

will uprgading headers and adding a cold air intake bump it up around 15 hp

All the other members are absolutely right with their assessments - save your money and enjoy the reliable, daily that you have now. When you're ready to make the move; let us know and we'll gladly help out!

[jclausen]

Do your self a favor either drive it the way it is or buy a 5.0 mustang

[BidNo]

Resolving any vacuum leaks, new NGK plugs, and fuel system cleaner along with 93 octane fuel and a long drive at highway speed work a treat on my car. Enjoy the ride