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Old 02-13-2001, 10:21 AM   #1
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Location: Seattle, WA
Post Horsepower ?

I have the Cobb Tuning Cold Air Intake, Borla Headers, Unorthodox Racing Underdrive pullies, Bosch Platinum 4 plugs, 5Zigen 2.25" catback exhaust, and an A'pex i S-AFC. How much Horsepower do you think I have? Please PM me if you have an educated guess.
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Old 02-13-2001, 10:28 AM   #2
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2000 2.5RS


added 15hp at most..

[This message has been edited by jacktam1 (edited February 13, 2001).]
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Old 02-13-2001, 10:29 AM   #3
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To get a true measure of horsepower we would need to know how many stickers you have and what color they are.

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Old 02-13-2001, 10:30 AM   #4
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Yep, judging from the SCC test of intakes and exhausts on their 2.5RS a year ago, I'd have to say around 15hp as well.
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Old 02-13-2001, 10:48 AM   #5
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For a MY99 I estimate 20-25hp. MY00+ 15-20. It really depends on your year.
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Old 02-13-2001, 10:50 AM   #6
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Be reminded that these "hp increases" are not cumulative. Some of the mods work on certain rpms and some don't.
I still think jugding hp on the # of stickers would be your best bet!
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Old 02-13-2001, 01:16 PM   #7
the spacecowboy
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racing strips will give you 15 itself...
best thing is, cheap...
also put T-Type on and that will give you a additional 5 ricepower.....i mean horsepower...

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Old 02-13-2001, 05:02 PM   #8
Derres Catalano
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2000 2.5 RS


Only 15 extra HP? You guys serious?

I am gonna get that with my MRT exhaust kit (dyno proven wheel HP increase) for $420 + shipping. Guess I'll save the rest of my money for a turbo or cams, since there's not much to gain, it seems.
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Old 02-13-2001, 05:19 PM   #9
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Yeah, I would guess 10-15HP throughout the power band. Maybe 20 Peak HP, which you almost never see in daily driving.

15HP is actually quite a bit, when you're talking about bolt-on's. Other than the pulley, all you've really done is free'd up the exhaust/combustion system. Butt-Dyno should be giving you a pretty good reading, too. The mods you listed should have greatly increased throttle response.
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Old 02-13-2001, 05:24 PM   #10
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2000 OBS


I once made the mistake of asking this. I too got lots of negative answers.

Only that much? But if you read Cobb Tunings power package promises then it doesn't match what folks here say. <sigh>

Personally I would just enjoy the extra power you have gained and not put a number on it. If you get your car dyno'ed I would love to hear the reults to see who is correct!

Don't let these folks put a downer on you though.
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Old 02-13-2001, 06:27 PM   #11
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hehe i hear that one.

btw: post 700...1000 here i come

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Old 02-13-2001, 06:50 PM   #12
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Thumbs up

Here are some numbers to help clear up the confusion. In the Sports Compact Mag. VOL 12, they made a dyno test with the following mods: Stromug dual tip w/Minnam Intake + Fuel=15HP at the wheels at 5300 RPM! This reading is not even complete because it doesn't mention at what point of the RPM data the peak is. I expect it to fluctuate another 3-5 HP. I think you should be happy with the results cause those numbers are all wheel HP! You can inflate the current wheel hp figure, and translate that into fly wheal hp to have a response of:...nooo waaay!
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Old 02-13-2001, 07:09 PM   #13
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BTW sorry fot the bad news, but it seems "the UD pulley does nothing... Just get the stock size pulley... thats what the rally car uses." Hey don't take it so hard, its only a mod...don't go jumping over your balcony or anything. Any check with the original posting in the forum first. The post is called UD pulleys or stock size pulleys.
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Old 02-13-2001, 07:35 PM   #14
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01 2.5 rs


isn't the 5 zigen fireball a ricer exhaust for the semi-non-ricer?
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Old 02-13-2001, 10:38 PM   #15
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If you buy a UD pulley for the HP gains, you're kidding yourself. If you're buying it for increased throttle response, and easier heel toe shifting, then you get the idea. FWIW UDP is not a realy high benefit to dollar ratio.
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Old 02-14-2001, 12:54 AM   #16
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What about G-Tech numbers? They claim +/- 3hp, and I'm averaging about 136 real world HP with it, using 3000lbs for weight. Weighed it on a truck scale at 2980, and have since added a sub and amp. My power mods are a GanzFlow intake and K&N drop-in filter. Anyone else have any G-Tech numbers?
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Old 02-14-2001, 07:44 AM   #17
Rich L
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1999 RS-Tw/ CobraMAF
Custom Rallispec kit/IC#1


An educated guess, would be about 15-20hp.

Not to down your efforts but it has be discussed many times that:

1) Cat back exhaust yield maybe 6hp in upper RPS
2) Most intakes give you about 10hp in upper rpms (most intakes lose a bit of torque in low rpms)
3)The headers might give 6hp in mid-range
(some ppl including myself report some lose of torque in the low end rpms)
4)SAFC might give you back any loss of torque and 5hp upper rpm hp.
4)UP and plugs are wasted money.

But the best thing to do it to time yourself at a track. This will give you a much better idea of your probable hp.
-or find a 4 wheel dyno!
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