Best initial modification for increasing Hp, 2.5RS

[Euro_Trash]

Originally posted by GTS Jeff
For that cheap the cams must be made of wood!!

Autotech cams, other then Techtonics I would have to say the best cams for VW

And the mandrel bender is my girlfriends dads friend. My girlfriends dad has had all of his piping for his cage done by him for his 70 Boss 302. Also buys SS pipe off of him for really cheap

[Fuji]

Originally posted by Euro_Trash


Autotech cams, other then Techtonics I would have to say the best cams for VW

And the mandrel bender is my girlfriends dads friend. My girlfriends dad has had all of his piping for his cage done by him for his 70 Boss 302. Also buys SS pipe off of him for really cheap

you're my new friend. Think I can buy piping off him too?

[Euro_Trash]

Originally posted by Bluebaru
Thanks guys, I'll look into the exaust system, intake and cam.

I didn't think I'd get so many response so quickly

Haha from what I have gained from this thread is that it is going to be a lot more expensive for intake, exhaust and cam for your car then I thought. These other people have more experience with subies, and they say suspension, so Im going to have to agree with them. You should probably do a little more thinking about it, because in either case intake, exhaust and a cam isn't going to do that much for ya

[Euro_Trash]

Originally posted by Fuji



you're my new friend. Think I can buy piping off him too?

When I buy piping for my exhaust and my intercooler piping, Ill let ya know

[Jason Lange]

Originally posted by Euro_Trash


Autotech cams, other then Techtonics I would have to say the best cams for VW

And the mandrel bender is my girlfriends dads friend. My girlfriends dad has had all of his piping for his cage done by him for his 70 Boss 302. Also buys SS pipe off of him for really cheap

You my friend obviously don't know what a mandrel bender does or looks like. He may go to mopac or similar and buy some mandrel bends but the money involved in a mandrel bender is far above, yeah my girlfriends dads friend has one.

[Euro_Trash]

Umm k I am trying to impress you by saying I know a person who has a bender.... please like me Jason

[googe]

nitrous is always an option

[GC84ever]

The best way to get the most power possible is to swap the EJ25 motor for one of the Subaru turbo motors ex: EJ20, EJ22T, EJ257 etc..
Or you ca turbo your RS and make a RS-T. But it requires lots of tuning nd is generally not as reliable as a swap.

BTW what are your goals for power?

[googe]

Originally posted by GC84ever
The best way to get the most power possible is to swap the EJ25 motor for one of the Subaru turbo motors ex: EJ20, EJ22T, EJ257 etc..
Or you ca turbo your RS and make a RS-T. But it requires lots of tuning nd is generally not as reliable as a swap.

BTW what are your goals for power?

oh right, i forgot you can do that for $1000

[Euro_Trash]

Save your money and turbo it, just wait a little while more for some more money

[Bigchuckers]

Well it has been my experiance with a 2.5 RS that you can see significant gains with a cold air intake. I helped a buddy build one for his '98 and according the his S-AFC he was able to pick-up 560rpm more in 5th gear on the top-end after. To me finding 500rpm on the top end would suggest there is a very worth while investment there. If I knew the aerodynamic specs on the car I could figure out what kind of power gain that is (we don't have dyno's around my parts, just very flat, long stretches of highway so thats how we dyno tune as unsafe as it is)

Sport Compact Car magazine did a bolt-on article on 2.5's a few years back. I know I still have the article packed away somewhere because we used it as a guidline, but to sum things up on the top-end those cars are very restrictive intake/exhaust wise and not very efficient. If I remember correctly SCC figured they upped peak BHP from 165 to near 190-195 just off the intake and exhaust mods. So its safe to say unlike a Honda or VW (which everyone seems to be basing their opinions off of), the gains would be there for sure. Infact I think installing a S-AFC or something along those lines is needed because re-setting the ECU alone isnt enough.

[Jason Lange]

Originally posted by Bigchuckers
Well it has been my experiance with a 2.5 RS that you can see significant gains with a cold air intake. I helped a buddy build one for his '98 and according the his S-AFC he was able to pick-up 560rpm more in 5th gear on the top-end after. To me finding 500rpm on the top end would suggest there is a very worth while investment there.

So this 500rpm was in the 1/4 or ?? How did you measure getting 500 extra rpm in 5th?

[Fuji]

Originally posted by GC84ever
The best way to get the most power possible is to swap the EJ25 motor for one of the Subaru turbo motors ex: EJ20, EJ22T, EJ257 etc..
Or you ca turbo your RS and make a RS-T. But it requires lots of tuning nd is generally not as reliable as a swap.

BTW what are your goals for power?

I forgot you can do that for under $10,000. And still have it run even remotely reliably

[QuasarCav]

Originally posted by Bigchuckers


Sport Compact Car magazine did a bolt-on article on 2.5's a few years back. I know I still have the article packed away somewhere because we used it as a guidline, but to sum things up on the top-end those cars are very restrictive intake/exhaust wise and not very efficient. If I remember correctly SCC figured they upped peak BHP from 165 to near 190-195 just off the intake and exhaust mods. So its safe to say unlike a Honda or VW (which everyone seems to be basing their opinions off of), the gains would be there for sure. Infact I think installing a S-AFC or something along those lines is needed because re-setting the ECU alone isnt enough.

30hp from a bolt on intake and exhaust? Was a squirrel living in there?

[Fuji]

Originally posted by Bigchuckers
Well it has been my experiance with a 2.5 RS that you can see significant gains with a cold air intake. I helped a buddy build one for his '98 and according the his S-AFC he was able to pick-up 560rpm more in 5th gear on the top-end after. To me finding 500rpm on the top end would suggest there is a very worth while investment there. If I knew the aerodynamic specs on the car I could figure out what kind of power gain that is (we don't have dyno's around my parts, just very flat, long stretches of highway so thats how we dyno tune as unsafe as it is)

Sport Compact Car magazine did a bolt-on article on 2.5's a few years back. I know I still have the article packed away somewhere because we used it as a guidline, but to sum things up on the top-end those cars are very restrictive intake/exhaust wise and not very efficient. If I remember correctly SCC figured they upped peak BHP from 165 to near 190-195 just off the intake and exhaust mods. So its safe to say unlike a Honda or VW (which everyone seems to be basing their opinions off of), the gains would be there for sure. Infact I think installing a S-AFC or something along those lines is needed because re-setting the ECU alone isnt enough.

SCC may say otherwise, but all the 2.5RS owners I know, Myself included, with intake/exhaust did not make close to 190HP (even on a gtech). Infact with I/H/E SAFC, ITC. I bet it didnt break 180HP. The car just sounded meaner, that's about it.

With all those mods. On the track a stock RSX-S on the straight away would pull away.

[Bigchuckers]

Well I just went by what SCC had printed as his car has never seen a dyno. As I said, if I knew the frontal area and the co-efficent of drag numbers on the car I could tell you exactly how much more power was made at speed.

If a car has a 0.780:1 5th gear ratio, 4.11:1 final drive making overall 3.21:1, with 205/55-16 tires, 550rpm should be worth about 12mph. So however much horsepower it takes to push his car from its before intake speed of 119mph to 131mph (measured using the RPM reading off the SAFC, tire measurements and the above ratio's) is what we gained. Runs were about an hour apart on a summer night so I doubt temp's were too different.

I would expect a RSX Type-S to pull away even with those mods. It is more efficent aerodynamicaly, has better gearing for 5th gear acceleration and has more power in that area of the powerband.

So this 500rpm was in the 1/4 or ?? How did you measure getting 500 extra rpm in 5th?

They were 5th gear runs down the (empty) highway.

[GTS Jeff]

Originally posted by Bigchuckers
Well I just went by what SCC had printed as his car has never seen a dyno. As I said, if I knew the frontal area and the co-efficent of drag numbers on the car I could tell you exactly how much more power was made at speed.

If a car has a 0.780:1 5th gear ratio, 4.11:1 final drive making overall 3.21:1, with 205/55-16 tires, 550rpm should be worth about 12mph. So however much horsepower it takes to push his car from its before intake speed of 119mph to 131mph (measured using the RPM reading off the SAFC, tire measurements and the above ratio's) is what we gained. Runs were about an hour apart on a summer night so I doubt temp's were too different.

I would expect a RSX Type-S to pull away even with those mods. It is more efficent aerodynamicaly, has better gearing for 5th gear acceleration and has more power in that area of the powerband.



They were 5th gear runs down the (empty) highway.

So do you consider yourself a Benchracer or a riceamatician?

[benyl]

Originally posted by GTS Jeff
So do you consider yourself a Benchracer or a riceamatician?

haha. I can't say I agree with what he is saying, but I do like the boobs in his avatar!

[Bigchuckers]

Originally posted by GTS Jeff
So do you consider yourself a Benchracer or a riceamatician?

More benchracer

[GTS Jeff]

Originally posted by Bigchuckers


More benchracer

...with nice tits I guess.