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Old 07-13-2002, 06:46 PM   #1
joefocker20
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Default Can someone give me a HP/TQ estimate?

I'm planning on buying Cobb Mild cams soon, and I was wondering how much hp/tq my car would have with these my power mods. Also, How much less would I get my ass kicked by a Rex? Thanks.
Ganz CAI
K&N
Stromung midpipe/straightpipe
PROECM chip
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Old 07-13-2002, 08:45 PM   #2
RawCode
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To keep up with a WRX would need to add heads or No2..

Probly around 140-150 hp

RawCode
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Old 07-13-2002, 09:18 PM   #3
Reciprocity
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A stock WRX motor (in a 2000 2.5RS with a lightened flywheel) puts 184 hp to the wheels.

My 2000 2.5RS with underdrive pulley, MRT header, Borla exhaust and DIY intake of insanity put 150 hp to the wheels.

Your car doesn't have the MRT, but it does have the Proecm...so I'm guessing around 140 at the wheel, perhaps less. An MRT will give you around 14 hp...if I recall from prior testing. However...I'm not sure at which RPM all that HP is so I could be off by a bit. Proecm dyno'ed at...what was it, 4-5 hp?

Another 2000 2.5RS with a Ganz intake, Cobb "spicy" cams, SAFC and ITC, and full MRT system put... 154 hp to the wheels.

The Cobb cam alone isn't going to bring you anywhere near WRX territory...even with a good header. You'll need head work, ECU, and more aggressive cams...if you want to stay NA. Otherwise, FI or NO2.

However...if that WRX isn't stock...it'll take quite a bit of work.

Good luck!

NC
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Old 07-15-2002, 04:24 PM   #4
Section 8
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Keep in mind that its the power to weight ratio that gives an indiaction as to how fast a car will be. A WRX is 300 pounds heavier than an RS, so it is giving up acceleration by needing to accelerate more weight hence equal acceleration does not mean equal power. You can gain "free" acceleration by reducing your weight further.

cheeRS,

Greg
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Old 07-15-2002, 04:58 PM   #5
Reciprocity
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Very true...weight is a bigger deal then a lot of people realize...just ask the Miata people.

I wonder what the gearing differences are too...

NC
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Old 07-15-2002, 06:08 PM   #6
Jayson_K
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Speaking of weight reduction ...

How balanced are RS's ? Will taking out the spare shift more weight to the front and just be kinda pointless? Does balance matter much for pure acceleration (especially with AWD)?
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Old 07-16-2002, 07:41 PM   #7
Section 8
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Weight reduction is always better than balance. Particularly in straightline acceleration. You can come up with extreme examples to disprove that, but it is better to have 200 less pounds than 15 more HP. Weight affects acceleration, braking and turning as well, where as HP only affects acceleration.

It actually works out well, because there is more weight over the front wheels that tend to want to spin from a stand still.

cheeRS,

Gerg
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Old 08-01-2002, 05:36 AM   #8
cvalle-sd
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werd - by losing my spare tire (not the one on my midsection, but that needs to go as well) and changing to an aluminum hood, I felt a big difference. less mass means the same force produces more acceleration, or that decelerating that mass requires less force. Gotta get one of those lightweight battereies...and a treadmill.
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Old 08-01-2002, 10:35 AM   #9
BOY
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No where near WRX territory?


I've got a very similar setup to what you're doing. This is AFTER we gave it up. At the time I was running Weapon R, custom y-pipe with high flow cat, UD pulley. Now I'm running a full header (similar to MRT), and a ProECM. The Cobb cams yield ~22 hp on a stock car. With other mods you will see definate improvements. As for the guy(s) running the spicy cams, the hp peak on the spicies is at our fuel cut, without a higher redline the street and spicy are about equally fast.
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Old 08-01-2002, 01:43 PM   #10
Jademonkey
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Quote:
Originally posted by cvalle-sd
Gotta get one of those lightweight battereies...and a treadmill.
Haha...yeah, I've gained about 15 lbs since I bought my RS...
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Old 08-01-2002, 02:12 PM   #11
MY99 2.5GT
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All things equel (Driver Skill, Massaging of the Tranny, Reaction Time-street racing only as RT don't matter at the track) you would have to have a pretty wrung out EJ25 to keep up.

In stock form the WRX has a lot going for it. A much higher redline and tall gears to make use of that high rpm boost. IIRC the USDM WRX's ECU doesn't allow full boost to be reached until 3rd gear. A simple manual boost controller will change the drivability and power delivery of the car. I don't think it will necessarily increase max power (Unless you crank up the boost) but it will make the car faster as power will come on sooner.

As far as weight balance, one of the things that makes the RX7 a great auto-x and track car is its perfect 50/50 weight ditribution. It throws its weight around really well. Most dragcars are set up to shift weight to the rear upon take-of for traction purposes. With an AWD car weight distribution isn't so important. As said above overall weight reduction is more essential then placement of weight.

I would go with the spicy cams, research a controll unit that effectively raises your redline and buy an SAFC to replace that ProECM chip.

Then I would say (all things equel) you would be approaching WRX territory.

Brad
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