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Old 03-31-2004, 12:39 PM   #1
SupaSizeFries
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Default What are your dyno #'s with one hi flow cat?

Regardless, of your setup, I just want to get an idea. Thanks.
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Old 03-31-2004, 01:24 PM   #2
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better than with stock setup
worse than catless



I can only give you this. I had a TXS Stg4 type setup on my WRX with the TXS high-flow cat. I removed the high-flow cat and put a race pipe in its place. The car was noticeably faster...noticeably louder too.

Accurate actual dyno numbers would have to fall out of a long test.
1) Run a hot car (one just off the street) on the dyno about 3 runs.
2) Get an average hp
3) Remove the stock cat and put in a highflow.
4) Drive around to get everything all hot again.
5) Do somedyno runs and get an average.
6) Compare

The problem with your question is that it's open to too many important variables. The results will differ greatly with the other mods involved. For instance, take this setup: AVO 600, 800cc injectors, UTEC, FMIC, CAI, ported TB, TGV deletes, ported heads, larger valves, Jun Cams, A/C delete, catless uppipe, headers, and 3.5" TBE with one high-flow cat (which would never be seen in this setup). The high-flow cat would be a major plug in power. Where as cutting the last cat off totally stock WRX and welding in a high-flow will do next to nothing for power.
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Old 03-31-2004, 02:04 PM   #3
stickman
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270hp/251tq
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Old 03-31-2004, 02:17 PM   #4
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Metoo and stickman, thanks for the info.

Metoo, you bring up a lot of good points about the differences that come along with different set ups. I'll be dyno tuning my stage IV (vf34 w/stock TMIC, TXS TBE, Perrin up-pipe, sti pinks, walbro, Blitz SBC-id) and wanted to get an idea of how much power I'll be leaving on the table with one TXS hi-flow cat. My setup isn't that crazy so I'm thinking that I might not be losing much. I'm wondering if I should just take the plunge and buy a race pipe as well, and swap it when the time comes for...certain tests.
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Old 03-31-2004, 04:54 PM   #5
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I put down 231whp on my 02 WRX with pre cat and APS TB with high flow cat.

Keep the high flow cat on the car. The difference will not be that much. Just the smell of a catless car is enough to get you pulled over.

Jim
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Old 03-31-2004, 05:32 PM   #6
powbmps
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With an 18g and a 'high flow' cat my car was falling on its face. 245 hp/~245 ft/lb. We took out the cat, put in a race pipe, and got 278 hp/258 ft/lb. I let the car warm up with the garage door shut so I can enjoy the smell.

Chris
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Old 03-31-2004, 08:20 PM   #7
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Quote:
Originally posted by powbmps
With an 18g and a 'high flow' cat my car was falling on its face. 245 hp/~245 ft/lb. We took out the cat, put in a race pipe, and got 278 hp/258 ft/lb. I let the car warm up with the garage door shut so I can enjoy the smell.

Chris
Wow, that is a big difference.
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Old 03-31-2004, 08:25 PM   #8
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Quote:
Originally posted by SupaSizeFries
Metoo and stickman, thanks for the info.

Metoo, you bring up a lot of good points about the differences that come along with different set ups. I'll be dyno tuning my stage IV (vf34 w/stock TMIC, TXS TBE, Perrin up-pipe, sti pinks, walbro, Blitz SBC-id) and wanted to get an idea of how much power I'll be leaving on the table with one TXS hi-flow cat. My setup isn't that crazy so I'm thinking that I might not be losing much. I'm wondering if I should just take the plunge and buy a race pipe as well, and swap it when the time comes for...certain tests.
u have the same set up as me except i dont have an EBC but a unichip and i have JDM STI IC, STI axleback and this was on 16psi.

i would get a race pipe for those days were u want to turn up ur boost and use race gas since u have that EBC.
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Old 03-31-2004, 09:27 PM   #9
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Quote:
Originally posted by SupaSizeFries
Wow, that is a big difference.
Don't expect those kinda gains. There were other factors involved there for sure. Do expect very noticeble gains. I hesitate to put a value on it.

Look for a used race pipe.....it's just a pipe. As long as there are no dents, it's good. I bought one of the TXS-Spec race pipes on ebay for $35 brand new. It was a perfect fit and high quality piece. That guy must have been sued or treatened. I haven't seen his goods in some time.
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Old 04-01-2004, 08:59 AM   #10
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Maybe my cat was clogged or something. It looked okay, but that probably doesn't mean much. I would think that the gains I made are abnormal.

Chris

(I do feel kind of naughty going catless!)
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Old 04-01-2004, 09:23 AM   #11
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Quote:
Originally posted by metoo

I bought one of the TXS-Spec race pipes on ebay for $35 brand new. It was a perfect fit and high quality piece. That guy must have been sued or treatened. I haven't seen his goods in some time.
http://cgi.ebay.com/ebaymotors/ws/eB...tem=2469769111
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Old 04-03-2004, 08:51 PM   #12
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Just to compare i am catless i have a TXS jethot coated DP, TXS race pipe HKS CF/TI catback, Perrin catless uppipe, and reflash from vinshu i made 247hp and 250 tq
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Old 04-04-2004, 10:55 PM   #13
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Quote:
Originally posted by SjpWrx
Just to compare i am catless i have a TXS jethot coated DP, TXS race pipe HKS CF/TI catback, Perrin catless uppipe, and reflash from vinshu i made 247hp and 250 tq
Is that on the stock turbo?
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Old 04-04-2004, 11:06 PM   #14
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Quote:
Originally posted by SupaSizeFries
Is that on the stock turbo?
Yes making 15.5 to 16 pounds of boost
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Old 04-05-2004, 08:43 AM   #15
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312whp/300.3wtq with one APS hi-flow.
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Old 04-05-2004, 12:32 PM   #16
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298whp/287wtq FP18G TXS stage 4
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Old 04-05-2004, 02:50 PM   #17
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With 1 3" cat, I made 266whp and 250 lbs of torque with stock computer and SAFC running 16 psi on Pruven's dyno.
Turbo was stock housings with 16G compressor upgrade.
Same setup, except ECU was swapped out for Link PnP and retuned on Speedsport's (very low reading) dyno at 18 psi put out much more power according to the butt-o-metter and the clutch that started slipping. The dyno read 256 whp and 248 lbs of torque.

Alex...
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