ARH Headers Installed - Dyno Results
Thread Starter
2nd Gear Member
Joined: Sep 2006
Posts: 288
ARH Headers Installed - Dyno Results
I finally had some American Racing longtube headers installed today (along with some Steeda underdrive pulleys). This makes my current mod list the following:
American Racing Longtube Headers + Catted H-Pipe
Borla Stingers
C&L Cold Air Intake
93 Octane Mail Order Tune
Steeda Underdrive Pulleys
FRPP 3.73 Gears
I’ll give the good news first. The car sounds pretty incredible now. Definitely more bad *** with the headers. There are all sorts of sounds coming from the engine and exhaust that I’ve never heard before. It is deeper, I hear more of a growl, and the car all around sounds more pissed off. I am getting some trumpeting (that farty/raspy sound you momentarily heard at times), which I wasn’t expecting with the cats, but maybe this could be prevented with something other than a straight through muffler. Other than that, I am very impressed with the sound.
The bad news would be my dyno results (attached). Only 265 peak HP. My car is automatic, but I was expecting more along the lines of 290. Any thoughts on why my HP was so low? The lowest stock HP for automatic I have heard is about 240 (although I have heard people getting in the 250s). If you assume I was low at 240, that would mean the CAI and tune gave me 25, but I got NOTHING from the headers or UDPs.
As if the peak HP wasn’t bad enough, I am running lean at 13.6. When they took the car for a test drive before the longtube install, he thought he heard some pinging at WOT, which I hadn’t noticed, so I was lean even before the headers.
Could something be wrong here? Weather was hot (92 degrees) and humid today, but these numbers are SAE corrected, so the weather shouldn’t matter. Any other explanations on why I am so low?
Also, since I am already so lean, is there any more power to be had from a new tune?
[IMG]local://upfiles/49501/0D42F1281330409FBDFAA5304BF4F8D1.jpg[/IMG]
American Racing Longtube Headers + Catted H-Pipe
Borla Stingers
C&L Cold Air Intake
93 Octane Mail Order Tune
Steeda Underdrive Pulleys
FRPP 3.73 Gears
I’ll give the good news first. The car sounds pretty incredible now. Definitely more bad *** with the headers. There are all sorts of sounds coming from the engine and exhaust that I’ve never heard before. It is deeper, I hear more of a growl, and the car all around sounds more pissed off. I am getting some trumpeting (that farty/raspy sound you momentarily heard at times), which I wasn’t expecting with the cats, but maybe this could be prevented with something other than a straight through muffler. Other than that, I am very impressed with the sound.
The bad news would be my dyno results (attached). Only 265 peak HP. My car is automatic, but I was expecting more along the lines of 290. Any thoughts on why my HP was so low? The lowest stock HP for automatic I have heard is about 240 (although I have heard people getting in the 250s). If you assume I was low at 240, that would mean the CAI and tune gave me 25, but I got NOTHING from the headers or UDPs.
As if the peak HP wasn’t bad enough, I am running lean at 13.6. When they took the car for a test drive before the longtube install, he thought he heard some pinging at WOT, which I hadn’t noticed, so I was lean even before the headers.
Could something be wrong here? Weather was hot (92 degrees) and humid today, but these numbers are SAE corrected, so the weather shouldn’t matter. Any other explanations on why I am so low?
Also, since I am already so lean, is there any more power to be had from a new tune?
[IMG]local://upfiles/49501/0D42F1281330409FBDFAA5304BF4F8D1.jpg[/IMG]
4th Gear Member
Joined: Apr 2006
Posts: 1,541
From:
RE: ARH Headers Installed - Dyno Results
Who is your tune from?A 13.6 A/F ratio isn't toobad for a N/A car. I would highly suggest getting a tune for you L/Ts from a reputable tuner. A dyno tune would be even better. Are your O2 sensors connected? Any check engine lights? At any rate (IMO) dynoscan bevery finicky. Your #s canvary day to day. Did you do a baseline run before you had the headers installed?For all you know you could have lost power.
Thread Starter
2nd Gear Member
Joined: Sep 2006
Posts: 288
RE: ARH Headers Installed - Dyno Results
Tuneis from Brenspeed. They told me that longtubes don't require a retune, unless it is to deal with 02 sensor issues. They have great customer service though, they are going to be my first call to see how I can deal with this.
Rear 02s are not connected yet since the longtubes didnot come with the extensions from them (I was under the impression it came with everything required to install), so the CEL is on now for obvious reasons.
I have no baseline dyno numbers to compare this to unfortunately.
Rear 02s are not connected yet since the longtubes didnot come with the extensions from them (I was under the impression it came with everything required to install), so the CEL is on now for obvious reasons.
I have no baseline dyno numbers to compare this to unfortunately.
uhmmmm u could try a custom dyno tune with the guys u went with
4th Gear Member
Joined: Dec 2006
Posts: 1,400
From: Southern California(Orange County)
RE: ARH Headers Installed - Dyno Results
Those do seem low...Take it to another dyno and is the numbers are the same get a custom tune. What kinda dyno and where are you located?
5th Gear Member
Joined: May 2007
Posts: 2,690
From: N/A
RE: ARH Headers Installed - Dyno Results
Those numbers look way low. I would be checking how the dyno was run. Are these guys reputable, do they know what their doing with an S197? My mods aren't that different from yours (I have CMDP instead of UDP's) and mines a manual; I am assuming you went with a High Flow catted H when you put in the LT's. Anyway I ran 308 rwhp with very close to the same mods.
Before anyone gets to excited I know each car is different I say the aforementioned only as a reference point. It leads me to believe there was a problem with the way the car was dynoed or there is a problem with the tune. In any case there appears to be a problem.
Before anyone gets to excited I know each car is different I say the aforementioned only as a reference point. It leads me to believe there was a problem with the way the car was dynoed or there is a problem with the tune. In any case there appears to be a problem.
4th Gear Member
Joined: Jan 2007
Posts: 1,064
From: Ft.Myers, Florida
RE: ARH Headers Installed - Dyno Results
Those numbers look fine to me....i guess im about to get flamed for this though.
CAI +TUNE = 15-20 hp depending
Headers = 5-10 on NA car (start the flaming)
Pulleys = nothing...maybe 1-2
Saying your car based at 250 which is pretty normal you are pretty close. MAYBE off by 2-5 horse. I wouldnt worry about it, alot of these guys on here inflate numbers (omg let the flaming begin) from what they really are. I DID NOT SAY ALL, but when i see cai+tune = 302 hp i laugh a bit!
I wouldnt worry about it, try tweaking your a/f a bit see if that changes anything. Put your car up against joe shmoe with 300 hp from his pulleys and tune and you will put 5 cars on him.
Also get an o/r x pipe rather than H with cats and you are looking at freeing up 5-10 hp right there.
CAI +TUNE = 15-20 hp depending
Headers = 5-10 on NA car (start the flaming)
Pulleys = nothing...maybe 1-2
Saying your car based at 250 which is pretty normal you are pretty close. MAYBE off by 2-5 horse. I wouldnt worry about it, alot of these guys on here inflate numbers (omg let the flaming begin) from what they really are. I DID NOT SAY ALL, but when i see cai+tune = 302 hp i laugh a bit!
I wouldnt worry about it, try tweaking your a/f a bit see if that changes anything. Put your car up against joe shmoe with 300 hp from his pulleys and tune and you will put 5 cars on him.
Also get an o/r x pipe rather than H with cats and you are looking at freeing up 5-10 hp right there.
ORIGINAL: JGT
I finally had some American Racing longtube headers installed today (along with some Steeda underdrive pulleys). This makes my current mod list the following:
American Racing Longtube Headers + Catted H-Pipe
Borla Stingers
C&L Cold Air Intake
93 Octane Mail Order Tune
Steeda Underdrive Pulleys
FRPP 3.73 Gears
I’ll give the good news first. The car sounds pretty incredible now. Definitely more bad *** with the headers. There are all sorts of sounds coming from the engine and exhaust that I’ve never heard before. It is deeper, I hear more of a growl, and the car all around sounds more pissed off. I am getting some trumpeting (that farty/raspy sound you momentarily heard at times), which I wasn’t expecting with the cats, but maybe this could be prevented with something other than a straight through muffler. Other than that, I am very impressed with the sound.
The bad news would be my dyno results (attached). Only 265 peak HP. My car is automatic, but I was expecting more along the lines of 290. Any thoughts on why my HP was so low? The lowest stock HP for automatic I have heard is about 240 (although I have heard people getting in the 250s). If you assume I was low at 240, that would mean the CAI and tune gave me 25, but I got NOTHING from the headers or UDPs.
As if the peak HP wasn’t bad enough, I am running lean at 13.6. When they took the car for a test drive before the longtube install, he thought he heard some pinging at WOT, which I hadn’t noticed, so I was lean even before the headers.
Could something be wrong here? Weather was hot (92 degrees) and humid today, but these numbers are SAE corrected, so the weather shouldn’t matter. Any other explanations on why I am so low?
Also, since I am already so lean, is there any more power to be had from a new tune?
[IMG]local://upfiles/49501/0D42F1281330409FBDFAA5304BF4F8D1.jpg[/IMG]
I finally had some American Racing longtube headers installed today (along with some Steeda underdrive pulleys). This makes my current mod list the following:
American Racing Longtube Headers + Catted H-Pipe
Borla Stingers
C&L Cold Air Intake
93 Octane Mail Order Tune
Steeda Underdrive Pulleys
FRPP 3.73 Gears
I’ll give the good news first. The car sounds pretty incredible now. Definitely more bad *** with the headers. There are all sorts of sounds coming from the engine and exhaust that I’ve never heard before. It is deeper, I hear more of a growl, and the car all around sounds more pissed off. I am getting some trumpeting (that farty/raspy sound you momentarily heard at times), which I wasn’t expecting with the cats, but maybe this could be prevented with something other than a straight through muffler. Other than that, I am very impressed with the sound.
The bad news would be my dyno results (attached). Only 265 peak HP. My car is automatic, but I was expecting more along the lines of 290. Any thoughts on why my HP was so low? The lowest stock HP for automatic I have heard is about 240 (although I have heard people getting in the 250s). If you assume I was low at 240, that would mean the CAI and tune gave me 25, but I got NOTHING from the headers or UDPs.
As if the peak HP wasn’t bad enough, I am running lean at 13.6. When they took the car for a test drive before the longtube install, he thought he heard some pinging at WOT, which I hadn’t noticed, so I was lean even before the headers.
Could something be wrong here? Weather was hot (92 degrees) and humid today, but these numbers are SAE corrected, so the weather shouldn’t matter. Any other explanations on why I am so low?
Also, since I am already so lean, is there any more power to be had from a new tune?
[IMG]local://upfiles/49501/0D42F1281330409FBDFAA5304BF4F8D1.jpg[/IMG]
Thread Starter
2nd Gear Member
Joined: Sep 2006
Posts: 288
RE: ARH Headers Installed - Dyno Results
I have always been a pessimist, so I don't totally discount the people that say this may be perfectly normal, but all of my research including internet/magazines/talking to tuners themselves, has led me to believe that my mods (CAI/tune/headers/UDPs) are good for at least 40 rwhp Even with a terrible baseline of 240 rwhp for an auto, that would leave me with about 280 rwhp. If this is "ricer math" then let me know, but 40 HP from these mods seems reasonable.
I am not totally sure about the dyno shop I went to. Part of the reason I didn't have them do a full dyno tune is that I wasn't sure how experienced they were. They really seem like they know what they are doing with installs/etc, but they only recently got a Dynojet, so I don't know what to think.
How can you mess up a dyno run to get inaccurate results? I have heard of it happening.
The H-pipe is the H-pipe that comes with the ARH headers, I am assuming high-flow cats.
I am not totally sure about the dyno shop I went to. Part of the reason I didn't have them do a full dyno tune is that I wasn't sure how experienced they were. They really seem like they know what they are doing with installs/etc, but they only recently got a Dynojet, so I don't know what to think.
How can you mess up a dyno run to get inaccurate results? I have heard of it happening.
The H-pipe is the H-pipe that comes with the ARH headers, I am assuming high-flow cats.