Dyno Tune after headers

[kmastl]

Here are my results after having a dynotune done by Ben at Pur Performance in St. Charles mo
Very reasonable price, even though I only picked up a few horse I don't feel ripped off.

Started with 290 hp and 305 Tq
Ended up with 294 hp and 307 tq

Not a huge difference but the power was dropping off after about 5300 rpm I picked up 15hp and 15 tq at 5550ish

Current mods include

SW longtubes with highflow cats installed by Zack
K&N intake
Steeda underdrives
Jmod by zack

[musclemerc]

WHAT! Where's the 30hp everyone claims?
Is this just the header's and cat's? Did you swap the stock H pipe?

[kmastl]

The 30 hp is non-existant :shake:

I chose to keep the stock H-pipe back.



WHAT! Where's the 30hp everyone claims?
Is this just the header's and cat's? Did you swap the stock H pipe?

[MrBluGruv]

Wow, that's a pretty huge waste to be honest. Your only other 'power' mods were the K&N intake and U/D pulleys?

[musclemerc]

We just talked about this a few day's ago. I just started a new thread with a poll. Please vote!

[MrBluGruv]

This may seem silly so I'll put it here instead of the poll thread:

Do you think similar gains could be had sticking a set of cutouts after the first set of cats (if you still have them) as if you had the LT or even shorties and the rest stock?

[breeze]

u can suck all this air in and have it try to push it out a small pipe. defeating the purpose...

[kmastl]

I do not have any idea what kind of gains would be gotten. I would think cut outs on a NA car would sound awesome although I think the sound would out do the performance. But it's all apples and oranges.


This may seem silly so I'll put it here instead of the poll thread:

Do you think similar gains could be had sticking a set of cutouts after the first set of cats (if you still have them) as if you had the LT or even shorties and the rest stock?

[RacerX]

All depends on the bottleneck. Ah, just nopticed stock h-pipe... May as well do the rest of the exhaust system...

[RR|Suki]

Why bother putting headers on the thing if you're gonna leave the stock size h-pipe on it? I'm kinda surprised it even made 15 extra whp

[kmastl]

I really like the way the factory cat back sounds.. And I believe that I made more than 15 hp. The 15 hp is from the changes in tuning at the higher rmps. The tuner told me that the tune I had was already about 90% correct.

I do not have a before and after with the headers or any other mods. This is its first time on the dyno.

I was under the impression that 294 hp and 307tq was not bad for the limited mods that I have done.


Why bother putting headers on the thing if you're gonna leave the stock size h-pipe on it? I'm kinda surprised it even made 15 extra whp

[MrBluGruv]

So the real difference here is between having headers on without an adjusted tune then the NEW tune specifically for the headers?

[kmastl]

Yes, and the gains were minimal. I should have made this more clear.

I cannot say how much power I picked up since stock since this is the first time on the dyno. If it was making 290 before headers that would have really been something...


So the real difference here is between having headers on without an adjusted tune then the NEW tune specifically for the headers?

[MrBluGruv]

Yeh, that kinda changes things completely. :P

How big a difference do you feel? I'd love to hear your 1/4 times too, cause if I get that header system that'd be almost exactly my car.

[RR|Suki]

I really like the way the factory cat back sounds.. And I believe that I made more than 15 hp. The 15 hp is from the changes in tuning at the higher rmps. The tuner told me that the tune I had was already about 90% correct.

I do not have a before and after with the headers or any other mods. This is its first time on the dyno.

I was under the impression that 294 hp and 307tq was not bad for the limited mods that I have done.

ok now I'm confused, you said:
Started with 290 hp and 305 Tq
Ended up with 294 hp and 307 tq

So I thought you were saying you gained 15 whp total 4 of which were after the tweeks to the tune. But you say that this was your first time on the dyno? So where did the 15 number come from? If your car started life at say 240whp, you've gained 55whp total. So are you just subtracting 10 for the intake, some number for the u/d pulley etc to get to 15 from the header swap?

[kmastl]

I am not sure the total gained hp from the headers, I thought you were asking 30 from the tune.. my misunderstanding.

I thought I made it clear in the title. Dyno tune after headers..
Both lines on the graph were from today with the headers installed.

not before and and after


WHAT! Where's the 30hp everyone claims?
Is this just the header's and cat's? Did you swap the stock H pipe?

[kmastl]

ok now I'm confused, you said:

So I thought you were saying you gained 15 whp total 4 of which were after the tweeks to the tune. But you say that this was your first time on the dyno? So where did the 15 number come from? If your car started life at say 240whp, you've gained 55whp total. So are you just subtracting 10 for the intake, some number for the u/d pulley etc to get to 15 from the header swap?


I can only speculate as to how much power each of the mods made. But the 15 HP was where the dyno tune separated from the can tune (at the highend of the run) that I walked in there with today.

Other than that the canned tune and dyno tune are very similar.

[musclemerc]

The 30hp I quoted is from the conversation's we've had in the past on LT gain's on a N/A MM.


I am not sure the total gained hp from the headers, I thought you were asking 30 from the tune.. my misunderstanding.

I thought I made it clear in the title. Dyno tune after headers..
Both lines on the graph were from today with the headers installed.

not before and and after

[RR|Suki]

I can only speculate as to how much power each of the mods made. But the 15 HP was where the dyno tune separated from the can tune (at the highend of the run) that I walked in there with today.

Other than that the canned tune and dyno tune are very similar.

Ok so what you are saying is that between the two pulls, the largest difference peak was 4hp and the largest difference on the slope was 15hp?

So just to make it clear none of these numbers really say anything about how much power you may have gained with the headers. That was my only reason for the questions was to clarify that, because it was pretty clear to me that people weren't getting that.

That aside, if you keep the stock mufflers and match the pipe from the headers to the mufflers (including the H, pretty cheap to do) to the size of your header collector (I assume 2.5") the sound really won't change drastically and you'll get a lot more out of the headers. Just something to think about.

*edit* oh and yes you did gain more than 15whp on the slope since the that 15 was after the tune was tweaked for the headers. So whatever the headers added, that's unknown.

[kmastl]

The car feels completely different from stock as you would expect.

These are the order of my mods

K&N - a little louder not much different of a feel
Tune - Big difference more responsive and best bank for the buck
Steeda's - Couldn't tell a darn difference, maybe a dyno could idk
headers - huge difference all around the power curve much more aggressive sound, scares little children.
Jmod - makes it shift a lot faster and will not bark from first to second even harder.
Can tune vs dyno tune - as the graph shows the highend improved and feels a little more lively up there.. other than that I have a little different of a trans schedule to my liking.

I am curious as to what my 1/4 time would be as well. On the way to the shop today I had a little go with my brother from 50 - 90 against his stock 03 gt and pulled on him about a car length.


Yeh, that kinda changes things completely. :P

How big a difference do you feel? I'd love to hear your 1/4 times too, cause if I get that header system that'd be almost exactly my car.

[kmastl]

Ok so what you are saying is that between the two pulls, the largest difference peak was 4hp and the largest difference on the slope was 15hp?

So just to make it clear none of these numbers really say anything about how much power you may have gained with the headers. That was my only reason for the questions was to clarify that, because it was pretty clear to me that people weren't getting that.

That aside, if you keep the stock mufflers and match the pipe from the headers to the mufflers (including the H, pretty cheap to do) to the size of your header collector (I assume 2.5") the sound really won't change drastically and you'll get a lot more out of the headers. Just something to think about.

*edit* oh and yes you did gain more than 15whp on the slope since the that 15 was after the tune was tweaked for the headers. So whatever the headers added, that's unknown.

Correct, I was considering changing out the mid pipe but I decided to wait. I plan in the future of doing FI and when that time comes I am thinking about 2.5" h-pipe with new 2.5" mufflers and 2.5" res delete tips.

But these plans aren't in my immediate future, I wish they were.

[RR|Suki]

Correct, I was considering changing out the mid pipe but I decided to wait. I plan in the future of doing FI and when that time comes I am thinking about 2.5" h-pipe with new 2.5" mufflers and 2.5" res delete tips.

But these plans aren't in my immediate future, I wish they were.

Ahh if you are getting boost then you may as well wait. It's the only mod that counts ;)

[LANDY]

My n/a car went from 274rwhp to 293 rwhp when I did the kooks headers and x pipe. In the 1/4 mile it went from a best of 14.1 to consistent 13.80.@ 100mph. Both times were on 50 degree weather. And you did gain more than 4 rwhp.

[kmastl]

Yes I did make more than 4 HP. Both of these runs were today with the headers installed. One was with the canned tune and the other was the dyno tune. I made it kinda confusing. There is no before headers dyno run.

I am glad to hear that my car will most likely be a mid to low 14 second in the 1/4 mile.


My n/a car went from 274rwhp to 293 rwhp when I did the kooks headers and x pipe. In the 1/4 mile it went from a best of 14.1 to consistent 13.80.@ 100mph. Both times were on 50 degree weather. And you did gain more than 4 rwhp.

[musclemerc]

I'm just gathering info here guy's. So Landy, you got 19hp with LT's and an X pipe. I'm assuming you removed the stock H pipe correct?

[LANDY]

Yes Travis, and I had 2 1/2" all the way back no cats and 18" magnaflows.

[LANDY]

Yes I did make more than 4 HP. Both of these runs were today with the headers installed. One was with the canned tune and the other was the dyno tune. I made it kinda confusing. There is no before headers dyno run.

I am glad to hear that my car will most likely be a mid to low 14 second in the 1/4 mile.to get to the 13's all you need is control arms, and good rubber buddy.

[musclemerc]

Could you post this info on my new thread Landy? This is good truthful uninflated info. 19rwhp with LT's no cat's and a full 2.5" exhaust all the way back.

[burt ragio]

I would be very surprised if with a CIA LTH high flow cat 2.5" pipe X or H pipe 2.5' to oem mufflers one would not gain at least 25 hp & tq.
In most cases there is no need to change oem mufflers & the rest of pipe since it is a larger diameter from mufflers back. There have been previous dynos to prove this from the earlier days.