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Old 10-14-2004, 03:07 AM   #1
VR62STI
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Talking Got my STI dynoed today

My 2004 STI on a Mustang dyno at Gruppe-S did:

275 hp and 311 ft-lbs on 91 octane!

Mods are:

Accessport stage 2 91 octane
Gruppe-S header, jet hot
Helix catted DP
Forge exhaust
Perrin pulley
GPmoto short ram

I am extremely happy with the numbers, especially considering I still have a cat and no stink, and am on California cheapy 91. Unfortunately my air-fuel ratio was at 11.8:1; I called Cobb and they suggested using the latest Stage 2 base maps, and ditching the short ram. Now I'm going to have to dyno this thing on 93 - because 2 points maked a huge difference in butt-power.
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Old 10-14-2004, 03:12 AM   #2
NewShockerGuy
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Quote:
Originally Posted by VR62STI
My 2004 STI on a Mustang dyno at Gruppe-S did:

275 hp and 311 ft-lbs on 91 octane!

Mods are:

Accessport stage 2 91 octane
Gruppe-S header, jet hot
Helix catted DP
Forge exhaust
Perrin pulley
GPmoto short ram

I am extremely happy with the numbers, especially considering I still have a cat and no stink, and am on California cheapy 91. Unfortunately my air-fuel ratio was at 11.8:1; I called Cobb and they suggested using the latest Stage 2 base maps, and ditching the short ram. Now I'm going to have to dyno this thing on 93 - because 2 points maked a huge difference in butt-power.


Is that to the wheels or the crank?

-Nigel
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Old 10-14-2004, 03:41 AM   #3
VR62STI
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Wheels, of course!
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Old 10-14-2004, 08:39 AM   #4
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Good numbers on that dyno! I was told that it runs almost identical to Vishnu's. So those are pretty good numbers. Get thee to the track!
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Old 10-14-2004, 09:00 AM   #5
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what are the dyno figures of a stock STI on that dyno?
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Old 10-14-2004, 11:02 AM   #6
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I was thinking in the 230s for awp.
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Old 10-14-2004, 11:16 AM   #7
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THe mustang dyno puts it right at 235 IIRC.
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Old 10-14-2004, 12:45 PM   #8
offset
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How much of a difference do you feel the Gruppe-S header (w/ jet hot) did for you? I ordered the Helix DP with cat for my STi and plan on getting the Hydra and would like to have a good comparison to someone with an AccessPort to see what kind of HP difference might exist between them.

offset
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Old 10-14-2004, 01:26 PM   #9
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how much do they charge for dyno tuning?
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Old 10-14-2004, 02:21 PM   #10
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wrong forum, use proven power bragging
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Old 10-14-2004, 03:52 PM   #11
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good numbers#'s....i think that should put u about 255-260 hp on the Vishnu dyno...which is good enough for a 12.7ish @ 108 mph or so...thats good for a stock turbo on crap gas.

Time for a good turbo soon...then ur butt dyno will be real happy

Mark
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Old 10-14-2004, 05:11 PM   #12
NewShockerGuy
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Quote:
Originally Posted by VR62STI
Wheels, of course!

wow :-)

Very nice. Can't wait till I get my sti!

-Nigel
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Old 10-14-2004, 05:20 PM   #13
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Actually someone did a dyno the Gruppe-s and the Vishnu, and they were within a couple of hp of each other. So I think his numbers are close to what you would see on vishnu with them being 225-230 for a stock STI.
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Old 10-14-2004, 09:41 PM   #14
VR62STI
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They charged $65 for three runs. The Gruppe-S header made a big difference; lots of low-down pull. From a seat of the pants perspective - I liked the headers more than the downpipe, or Accessport.
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Old 10-15-2004, 01:51 AM   #15
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did the headers add more noise? or sound very similar to the way it was?
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Old 10-15-2004, 03:10 AM   #16
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Quote:
Originally Posted by VR62STI
They charged $65 for three runs. The Gruppe-S header made a big difference; lots of low-down pull. From a seat of the pants perspective - I liked the headers more than the downpipe, or Accessport.
is this Jon? Whats your screen name on I-club?
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Old 10-15-2004, 10:21 AM   #17
mno
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That pretty damn amazing I would love to see a sheet.

In fact I have a problem believing that was on a Mustang Dyno.

Quote:
Originally Posted by VR62STI
My 2004 STI on a Mustang dyno at Gruppe-S did:

275 hp and 311 ft-lbs on 91 octane!

Mods are:

Accessport stage 2 91 octane
Gruppe-S header, jet hot
Helix catted DP
Forge exhaust
Perrin pulley
GPmoto short ram

I am extremely happy with the numbers, especially considering I still have a cat and no stink, and am on California cheapy 91. Unfortunately my air-fuel ratio was at 11.8:1; I called Cobb and they suggested using the latest Stage 2 base maps, and ditching the short ram. Now I'm going to have to dyno this thing on 93 - because 2 points maked a huge difference in butt-power.
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Old 10-15-2004, 10:26 AM   #18
scooby24
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Quote:
Originally Posted by VR62STI
My 2004 STI on a Mustang dyno at Gruppe-S did:

275 hp and 311 ft-lbs on 91 octane!

Mods are:

Accessport stage 2 91 octane
Gruppe-S header, jet hot
Helix catted DP
Forge exhaust
Perrin pulley
GPmoto short ram

I am extremely happy with the numbers, especially considering I still have a cat and no stink, and am on California cheapy 91. Unfortunately my air-fuel ratio was at 11.8:1; I called Cobb and they suggested using the latest Stage 2 base maps, and ditching the short ram. Now I'm going to have to dyno this thing on 93 - because 2 points maked a huge difference in butt-power.

Wait so the Accessport will work with headers eh? Nice, I may go with AP after all. 11.8 to 1 isn't that bad is it? I thought it wasn't really dangerous until you get to around 13 to 1 and higher?
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Old 10-15-2004, 10:37 AM   #19
mnavarro
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How was spool with those headers on the 2.5? I looked at the dynograph for a 2.0 and you could tell spool was affected but how much with the jet-hot coated on the 2.5. With that turbo I'm thinking it's negligble.
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Old 10-15-2004, 10:46 AM   #20
scooby24
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Quote:
Originally Posted by mnavarro
How was spool with those headers on the 2.5? I looked at the dynograph for a 2.0 and you could tell spool was affected but how much with the jet-hot coated on the 2.5. With that turbo I'm thinking it's negligble.
An STi buddy of mine with the headers says he lost nothing down low according to the butt dyno and said spool was unaffected but has nothing to prove it just hearsay.
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Old 10-15-2004, 01:35 PM   #21
VR62STI
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-The headers changed the sound slightly, but not much. Still sounds cool.

-This isn't Jon from i-club, this is Dave from here!

- I don't have a photo-hosting account, but if someone wants to post a pic please send me mail! This was a brand new Mustang dyno; Gruppe-S formed "Gruppe-S Tuning" with one of the MPJ/GBMotorsports guys. He was impressed with the numbers, but worried I was running way too lean.

- The AP does NOT take into account the headers; Cobb just doesn't seem to care about headers and have never tuned for them. They are assuming Stage 1 and 2 will probably work just fine with headers. I am pretty sure I was running lean because of the short-ram fooling the MAF. I won't know for sure until I dyno again. I haven't heard "crackling" (detonation) since pulling off the intake.

-The spool on the headers is nearly identical to stock. It may actually be identical to stock - I just don't feel a problem down low, and I hit peak torque fast! It certainly DID NOT shift power by 500rpms; maybe 50 to 100.
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Old 10-15-2004, 02:08 PM   #22
VR62STI
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Here they are. I have limited bandwidth, so you have to copy and paste:

http://img.photobucket.com/albums/v4...003_1016AB.jpg
http://img.photobucket.com/albums/v4...003_1016AC.jpg
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Old 10-15-2004, 07:19 PM   #23
SloRice
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hey, those are some good looking numbers. I don't mean to bust your bubble or anything, but those are probably a little high. If you look at the 2nd pic sheet you posted, it has the weight and the HP @ 50 numbers. Those two numbers determine how much load is put on the car and they affect your HP output. Your weight is right at 3400, but you HP @ 50 number should be about 13.5 (this number is the amount of HP it takes to maintain a speed of 50mph - it's based on the coefficient of friction of the front end of the car). But the weight # has a larger impact on the HP numbers put out than the HP @ 50 number. So they are probably not that far off - maybe 5 HP or so.

In retrospect, with my weight at 3450 and my HP @ 50 at 13.5, I put out 275HP/285TQ with a turboback, short ram intake and boost controller @ 17psi.

Still good numbers none the less.

Tim
Sales Engineer
Mustang Dynamometer
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Old 10-15-2004, 10:26 PM   #24
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Interesting. I'll talk to the tech about the hp@50 number. We did three runs, 2 with the tech behind the wheel, and one with both of us in the car. The numbers varied about 1%, both ways. So if our cars are considered equal my additional header is making about 25 ft-lbs more... I actually believe that based on my highly-tuned butt-sensors. After years of tuning the GTI - I'm just happy to beat the 200 mark!
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Old 10-15-2004, 11:55 PM   #25
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was it a special that day or something?! i called them and they quoted me 175/hr? well maybe cuz i want a utec tune. hopefully i'll put out around the same with my upcoming set up... monster/blackhole deadbolt job on the stocker vf39,utec,catless tbe. i'm looking into headers,may get some as well,we'll see... i just can't wait to get to CA
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