Ok, dynoed my flowmaster catback
Thread Starter
Racer
Joined: Nov 2005
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Ok, dynoed my flowmaster catback
Ok a lot of guys were saying that you would probably loose power with this setup, I finally dynoed the vehicle with it on.
Before my car made 353hp and 356tq at the wheels with just a K&N intake.
After Flowmaster car made 358hp and 374tq. That is about 5hp and 18ftlbs.
Yeah the shop owner and tuner said that he was surprized that I did not loose any power as some guys have. He was impressed with the torque though. He also stated that most guys who get the Corsa's or Borlas get about 10 to 12hp at the tires and about even tq.
I knew that the vehicle seemed to pull a little harder down low, but up top I could not feel any difference. The shop owner recommended before I do long tubes that I get one of those exhaust systems he recommended cause he said that the vehicle will be crazy loud and may not give me full potential with the Flowmasters.
Well there you have it!
Before my car made 353hp and 356tq at the wheels with just a K&N intake.
After Flowmaster car made 358hp and 374tq. That is about 5hp and 18ftlbs.
Yeah the shop owner and tuner said that he was surprized that I did not loose any power as some guys have. He was impressed with the torque though. He also stated that most guys who get the Corsa's or Borlas get about 10 to 12hp at the tires and about even tq.
I knew that the vehicle seemed to pull a little harder down low, but up top I could not feel any difference. The shop owner recommended before I do long tubes that I get one of those exhaust systems he recommended cause he said that the vehicle will be crazy loud and may not give me full potential with the Flowmasters.
Well there you have it!
Advanced
Joined: Dec 2005
Posts: 72
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Thats great...almost 20 pnds of torque. Not bad for a system thats atleast 1/2 the price of other catbacks. Flowmaster has a great reputation and you just proved it for us......and you cant beat the flowmaster muscle car rumble.
thanks for posting
thanks for posting
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Thread Starter
Racer
Joined: Nov 2005
Posts: 293
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That is with ls2 edit tune on the vehicle, and dynoed to run at 13 to 1 air fuel ratio. He said that the tune was really running rich on the stock tune.
With just the dyno baseline, the car picked up the same 5hp and 0ft lb of torque(that could just be a variable between runs.) The tuner, Gill Naverez(you might have seen him on "Rides") says he tunes for acceleration, not hp or good dyno sheets. Gil did say that he was impressed with the torque, and that my numbers were not the norm. He showed me other dyno runs with before and after catbacks, and the Corsa's and the Borla's did show the same kind of numbers, approximately 10 to 12 hp and torque at the tires. He said that my motor is a little bit of a freak, cause all the other cars he has run on the dyno from the vette club averaged from 333 to 337 with just an intake, and that 353 was pretty damn good. I have raced a guy at work with his 2003 Z06, and I usually take him by about a car and a half by 100mph.
I have the dyno sheets but no way of posting it. Sorry, I need to buy a scanner or something, or maybe buy a digital camera.
With just the dyno baseline, the car picked up the same 5hp and 0ft lb of torque(that could just be a variable between runs.) The tuner, Gill Naverez(you might have seen him on "Rides") says he tunes for acceleration, not hp or good dyno sheets. Gil did say that he was impressed with the torque, and that my numbers were not the norm. He showed me other dyno runs with before and after catbacks, and the Corsa's and the Borla's did show the same kind of numbers, approximately 10 to 12 hp and torque at the tires. He said that my motor is a little bit of a freak, cause all the other cars he has run on the dyno from the vette club averaged from 333 to 337 with just an intake, and that 353 was pretty damn good. I have raced a guy at work with his 2003 Z06, and I usually take him by about a car and a half by 100mph.
I have the dyno sheets but no way of posting it. Sorry, I need to buy a scanner or something, or maybe buy a digital camera.
Advanced
Joined: Dec 2005
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To the other post that said he saw no gains before from flowmasters, are any of those results from the NEW C6 flowmaster system? When I talked to flowmaster they said they designed the c6 system from the ground up so if it's not this specific system than it's not valid info. Atleast this thread is concerning the new c6 flowmaster system and the results are positive even if it is with a tune. Bottom line is that bang for the buck in terms of exhausts you just cant beat the flowmaster catback which can be had for under $400.
Advanced
Joined: Dec 2005
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Forgot to mention in my last post that I doubt all the gains were from the tune because if you read the original post even the shop owner and tuner was surprised by the gains, if he thought the tune was the complete reason I doubt he would have mentioned it since that what a tuner does everyday. To me it appears that the tuner was impressed by the combo of the flowmaster catback and the tune. 
Team Owner
Joined: Feb 2000
Posts: 45,286
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From: Texas
CI 1-4-5-8-9-10 Vet
St. Jude Donor '03 thru '10, '17
that's a large TQ increase for such a small HP gain
Crunching the numbers makes one curious. Considering the equation for horsepower:
HP = (TQ x RPM)/5252
and solving for RPM at peak HP:
RPM = (HP X 5252)/TQ
means that before mods, this engine made peak HP at 5207 RPM, and after mods, it made peak HP at 5027 RPM (I know, the numbers look dyslexic).
Mods usually raise the engine speed at which peak HP occurs, not lower that speed.
I'm not calling B.S. on the original poster. But I do suspect that dyno is just not consistent.
HP = (TQ x RPM)/5252
and solving for RPM at peak HP:
RPM = (HP X 5252)/TQ
means that before mods, this engine made peak HP at 5207 RPM, and after mods, it made peak HP at 5027 RPM (I know, the numbers look dyslexic).
Mods usually raise the engine speed at which peak HP occurs, not lower that speed.
I'm not calling B.S. on the original poster. But I do suspect that dyno is just not consistent.
Racer
Joined: Dec 2005
Posts: 471
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From: Florida
An exhaust that is built for low-mid range power and torque gains would show numbers like that but I'd like to see the graph and see whats happening at 1-2-3-4,000 rpm relative to baseline. If you build for power there you cant have it on top too, there is no free lunch.
Team Owner
Joined: Feb 2000
Posts: 45,286
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From: Texas
CI 1-4-5-8-9-10 Vet
St. Jude Donor '03 thru '10, '17
I understand the relationship between HP, TQ, RPM and the effect of airflow and valve timing on the above. I know there is no free lunch when it comes to designing an engine and where peak HP and TQ occur with respect to engine speed.
This is not the same thing as reducing the diameter of primary tubes on a set of headers to increase velocity and low end torque at the expense of top end performance. This is a cat back exhaust system.
If you were talking camshafts, I would agree with you. However, I find it hard to beleive that an aftermarket exhaust system would be designed to reduce the engine speed at which peak HP occurs.
This is not the same thing as reducing the diameter of primary tubes on a set of headers to increase velocity and low end torque at the expense of top end performance. This is a cat back exhaust system.
If you were talking camshafts, I would agree with you. However, I find it hard to beleive that an aftermarket exhaust system would be designed to reduce the engine speed at which peak HP occurs.
Racer
Joined: Dec 2005
Posts: 471
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From: Florida
It's uncommon because big HP numbers sell pipes. Most people and most driving styles would be happier with more hp in the low and mid range where you do MOST of your driving.
The problem lies in the advertising. If you cant say it has X more peak power it doesnt sell because people buy those numbers.
Me personaly, I'd preffer 10hp from 1500 to 4500 and I dont care if the peak showed any gain. Thats where MY tach spends most its time.
The problem lies in the advertising. If you cant say it has X more peak power it doesnt sell because people buy those numbers.
Me personaly, I'd preffer 10hp from 1500 to 4500 and I dont care if the peak showed any gain. Thats where MY tach spends most its time.
Team Owner
Joined: Feb 2000
Posts: 45,286
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From: Texas
CI 1-4-5-8-9-10 Vet
St. Jude Donor '03 thru '10, '17
You won't get any argument from me on a preference for gains in "area under the curve" vs peak HP and TQ. All I am saying is that those dyno numbers don't add up.
Racer
Joined: Dec 2005
Posts: 471
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From: Florida
Originally Posted by need-for-speed
You won't get any argument from me on a preference for gains in "area under the curve" vs peak HP and TQ. All I am saying is that those dyno numbers don't add up.