Expected HP Gains

[tbtheqt]

I own the 09 Nissan Altima 2.5 S and I'm planning to install the following onto my car and wanted to know what the expected horsepower gain is before I invest. I need to know how much I will get with and without the Stillen exhaust.

Stillen headers $316

2J Racing Lightweight Pulley $110

K&N Intake $322

MAYBE
Stillen Exhaust $736


EDIT: I'm now looking for the cheapest way to gain the most power. If possible, I'd like to keep my budget around $1000. Any suggestions and inputs are greatly appreciated.

PLEASE DO NOT TELL ME TO GET A 3.5!

[702L32]

i paid $97 with shipping from 2J racing themselves. $110 is too much unless you want the pulley asap.

[mrsalty]

5-15 whp

[tbtheqt]

Originally Posted by 702L32

i paid $97 with shipping from 2J racing themselves. $110 is too much unless you want the pulley asap.

I see on the 2J Racing site that it's cheaper. Thanks. Also, my friend said the pulley affects the A/C and P/S. Do you know what the P/S combo is?

Originally Posted by mrsalty

5-15 whp

The is dyno-ed at ~7 whp and K&N intake has about 9 whp at it's peak, let alone the rest of the parts.

[mrsalty]

Originally Posted by tbtheqt

I see on the 2J Racing site that it's cheaper. Thanks. Also, my friend said the pulley affects the A/C and P/S. Do you know what the P/S combo is?



The is dyno-ed at ~7 whp and K&N intake has about 9 whp at it's peak, let alone the rest of the parts.

7+9 will not add up to 16 in the HP world. Try it for yourself if you don't believe me. Also I like to see 3 stock and 3 modded dyno runs not just the two that make a product look the best.

[702L32]

the 2J is just a crank pulley. its the same size just only 1lb. should not affect the ac or ps. it didnt on mine

i did see after i bought my pulley that there was a crank and ps combo. but there were no real gains other than looks to it. just stick to the crank pulley

after your intake and exhaust you really should look into a tuner of some kind. there is the Bully Dog Triple GT tuner that does alot more than a mild tune, and the UpRev. around $300 for the Bully and i think like $700 for the uprev. it all depends on how much u can spend and how far you wanna go. i myself just have the BullyDog. it also has a throttle controller built in. dont know about the uprev

[jeffb3348]

It appears stillen is the only company that makes the underdrive pulley for the 07-12 3.5L engines?

I couldnt find any other competitors. Hoping to find a little cheaper if possible but i may just settle.

[tbtheqt]

Originally Posted by 702L32

after your intake and exhaust you really should look into a tuner of some kind. there is the Bully Dog Triple GT tuner that does alot more than a mild tune, and the UpRev. around $300 for the Bully and i think like $700 for the uprev. it all depends on how much u can spend and how far you wanna go. i myself just have the BullyDog. it also has a throttle controller built in. dont know about the uprev

I found these 2 and I'm not sure which one is better. Is it complicated to tune your own engine, I have no experience with it at all.

http://www.bullydog.com/product.php?...ISSAN%20ALTIMA
http://www.bullydog.com/product.php?...ISSAN%20ALTIMA

According to the dyno charts, tested vehicles gained approximately 100 hp. I'm not sure if that's at all accurate but if so, can an Altima 2.5 handle that much hp gains? (engine, CVT-wise)

[blueis300]

My tablet wont pull it up but 100 hp with the bullydog. I dont see any altima 2.5 gaining anything near that with basic bolt on with any tune.

[jeffb3348]

10-15 HP is realistic. maybe 20 with other mods. it has 3 settings for regular fuel, to xtreme which needs premium. It modifies the fuel curves to maximize gains. There are a few wires that have to be hooked up to 4 diff. sensors, then plugs into ODB2 port. you can modify the sensors like increasing mass air flow for more throttle. O2 sensor can modify air fuel ratio if you like, but best to lay easy if you dont know what your doing. You could run too lean or rich on fuel.

hope that helps? Too bad nissan is hard to crack the ECM. American models have plug and play and your done. but you can still achieve good gains

[tbtheqt]

Forget the tuner. What's the cheapest option to gain most go with a budget of $1000?

[mrsalty]

Not really a HP gain but I'd go with weight reduction. Start with rotating mass.

[blueis300]

Originally Posted by tbtheqt

Forget the tuner. What's the cheapest option to gain most go with a budget of $1000?

I Know nothing about this place but just An example.

Altima Nitrous Kits to customize your Nissan

Nothing is gonna be cheap in terms of all time power.

[jeffb3348]

# 1 and # 2 must do's. Racingline y-pipe (it deletes 1 of the 3 cats)
cold air intak / short ram .... i love my injen short ram.

Thats $550 tops and probably gives you 20 WHP, and 20 lbs torque. Promise you will feel those. Id maybe say underdrive pulley next. only $100-150 for up to another 10 HP.

that still leaves you $300 to $350 to play with.


OOPS, my bad. they dont have the y-pipe for 2.5. SO scratch that to headers

[gameguru1360]

if you had the 2.5, there's also this company:

2J-Racing Lightweight Crank Pulley QR25DE

Much cheaper than Stillen and doesn't require putting on an aftermarket belt