Disappointing HKS Dual Exhaust Dyno Numbers!
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Diesel350,
Slam some test pipes on there and you will eliminate the last major bottle neck in the system.
Using test pipes with a stock exhaust is one thing... some gains.
Using test pipes along with a high performance exhaust and you will get some real gains.
They're cheap too.
Slam some test pipes on there and you will eliminate the last major bottle neck in the system.
Using test pipes with a stock exhaust is one thing... some gains.
Using test pipes along with a high performance exhaust and you will get some real gains.
They're cheap too.
Sorry if this comes out wrong; just trying to get some info Meechin. Why pay 150 or whatever it costs him to get his car dyno'd when results will be the same? Did you reset your ecu after installing an exhaust and make good gains? If not; what are you basing the ecu reset idea on...
To the thread creator; as long as you like the exhaust that's really all that matters; just hope you werent expecting big gains ; 95% of the ones out there won't give that to you. Best regards;
Jason
To the thread creator; as long as you like the exhaust that's really all that matters; just hope you werent expecting big gains ; 95% of the ones out there won't give that to you. Best regards;
Jason
Originally Posted by MEECHIN
But i still say try the ECU reset before making any final conclusions.
Let us know how it goes.
POB
DRU
Let us know how it goes.
POB
DRU
Originally Posted by goodbye evo8
Sorry if this comes out wrong; just trying to get some info Meechin. Why pay 150 or whatever it costs him to get his car dyno'd when results will be the same? Did you reset your ecu after installing an exhaust and make good gains? If not; what are you basing the ecu reset idea on...
I'm gonna put my flame suit on for this post.
But here goes...
The last time i dyno'd i showed up at Church's where a few G's and Z's showed up.
Right off the bat, i pulled 285hp/260tq. (dynapack)
No tuning, stock internals, stock cats.
The next closest car was a Z that pulled 272/258 IIRC.
That Z had TechnoSquare Reflash and test pipes or hi flows. stock internals.
Granted, dynapack #s will read slightly higher vs dynojet but that's besides the point here.
Numbers DO NOT lie.
Before heading to the DYNO, i did the typical ECU reset and redlined thru the gears all the way there.
Diesel350, i dunno who you've been talking to. But i will tell you one thing straight from me.
For me, the ECU reset is a must prior to a Dyno Run.
Whether it be a day or an hour before, reset and gunning it will put it into the aggressive mapping.
As i said before, your car might have adapted to the new HKS exhaust in the past 500 miles.
But it's very likely that your ECU is in the least aggressive mapping.
Reset it, punch it into the most aggressive mapping and then go Dyno again (should be $75 at most or you're getting hosed)
i'm POSITIVE you'll pull better numbers.
Let the VQ guru Tony/Hydrazine snuff me if i'm wrong.
*puts visor down and sits in flame suit*
Also, don't hold me to the idea that an ECU reset will magically cure your car from being sluggish.
I've reset the ECU on a few cars that were described as "sluggish"
After the reset, the cars were punched hard.
But still, they didn't pull as hard as they "should"
On paper, some of them pulled low numbers EVEN AFTER the ECU RESET.
Carbon buildup, leaks, bad seals, faulty plugs, who knows?
Every car is different.
But on a healthy engine, an ECU reset will work wonders in terms of performance by the seat of your pants AND on DYNOs.
POB
DRU
I've reset the ECU on a few cars that were described as "sluggish"
After the reset, the cars were punched hard.
But still, they didn't pull as hard as they "should"
On paper, some of them pulled low numbers EVEN AFTER the ECU RESET.
Carbon buildup, leaks, bad seals, faulty plugs, who knows?
Every car is different.
But on a healthy engine, an ECU reset will work wonders in terms of performance by the seat of your pants AND on DYNOs.
POB
DRU
Better keep that flame suit on. 
(j/k) Sorry; but I don't see how that proves or even attempts to prove anything? Did you dyno the car before; same conditions;(except resetting ecu) and pull significantly lower numbers?
(j/k) Sorry; but I don't see how that proves or even attempts to prove anything? Did you dyno the car before; same conditions;(except resetting ecu) and pull significantly lower numbers?
Originally Posted by MEECHIN
i did the typical ECU reset and redlined thru the gears all the way there.
Originally Posted by DP03
He drove the car for 3 weeks before dyno. His ECU had plenty of time.
Originally Posted by DP03
As said above, guys, you do exhaust on these cars for sound...
and that says a lot.
there's a lot of ricky retardos on this forum.
the HKS exhaust definitely does have one of the sexiest exhaust notes, but it also is a helluva lot more free-flowing.
Top-end RPMs climb MUCH MUCH MUCH more easily.
But that's just me.
You're entitled to your own opinion.
However wrong it may be, u're still entitled to it.
Originally Posted by goodbye evo8
Better keep that flame suit on. (j/k) Sorry; but I don't see how that proves or even attempts to prove anything? Did you dyno the car before; same conditions;(except resetting ecu) and pull significantly lower numbers?
(j/k) Sorry; but I don't see how that proves or even attempts to prove anything? Did you dyno the car before; same conditions;(except resetting ecu) and pull significantly lower numbers?
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Joined: Aug 2005
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From: Chesapeake Bay, MD.
Originally Posted by MEECHIN
Yeah... Plenty of time to go into granny mode.
quite possibly the stupidest comment i've ever red on this forum.
and that says a lot.
there's a lot of ricky retardos on this forum.
the HKS exhaust definitely does have one of the sexiest exhaust notes, but it also is a helluva lot more free-flowing.
Top-end RPMs climb MUCH MUCH MUCH more easily.
But that's just me.
You're entitled to your own opinion.
However wrong it may be, u're still entitled to it.
quite possibly the stupidest comment i've ever red on this forum.
and that says a lot.
there's a lot of ricky retardos on this forum.
the HKS exhaust definitely does have one of the sexiest exhaust notes, but it also is a helluva lot more free-flowing.
Top-end RPMs climb MUCH MUCH MUCH more easily.
But that's just me.
You're entitled to your own opinion.
However wrong it may be, u're still entitled to it.
What you are experiencing is your ears are affecting your butt dyno. That is very common. I'm not saying there are no gains by doing exhaust without cats or headers. I'm just saying they are minimal.
I'm planning on the Stillen exhaust soon, but only because I prefer more auditory feedback from the engine.....
Last edited by DP03; Mar 2, 2006 at 08:45 AM.
Thread Starter
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Joined: Sep 2005
Posts: 329
Likes: 3
Originally Posted by Hydrazine
Diesel350,
Slam some test pipes on there and you will eliminate the last major bottle neck in the system.
Using test pipes with a stock exhaust is one thing... some gains.
Using test pipes along with a high performance exhaust and you will get some real gains.
They're cheap too.
Slam some test pipes on there and you will eliminate the last major bottle neck in the system.
Using test pipes with a stock exhaust is one thing... some gains.
Using test pipes along with a high performance exhaust and you will get some real gains.
They're cheap too.
Originally Posted by trey.hutcheson
That chart, according to the OP, includes the exhaust *AND* the MREV.