Fast Intentions exhaust and header comparison. Before and after UPRev tune (Dyno)

XwChriswX · 04-08-2010, 12:34 PM

When it comes to dyno's, can you explain why they are done in the manner they are, neither in the lowest or the highest gear, and why you dont step up through the gears? I never completely understood that...

Pablo Z · 04-08-2010, 01:00 PM

Quote:

Originally Posted by XwChriswX

When it comes to dyno's, can you explain why they are done in the manner they are, neither in the lowest or the highest gear, and why you dont step up through the gears? I never completely understood that...

My understanding (and it could be wrong) is that you want to get as close to 1:1 for the TQ & HP readings to be truly 'real world' numbers. I'm sure someone more knowledgeable than me will be able to provide a better/more accurate explanation.

XwChriswX · 04-08-2010, 01:02 PM

Where are you doing your runs at? Have you gone to any particular shops over there? Being in Chandler you must know of INTENSEMotorsports right? Those guys are awesome!

I wish there were more shops over here on the west side.

B1nks · 04-08-2010, 01:09 PM

Quote:

Originally Posted by XwChriswX

Where are you doing your runs at? Have you gone to any particular shops over there? Being in Chandler you must know of INTENSEMotorsports right? Those guys are awesome!

I wish there were more shops over here on the west side.

On the west side of what ? If you're talking about the west coast then you're crazy because there are a TON of badass shops there. Also if you're talking about AZ then there are still plenty there. They may not be Z only shops but there have been a few shops in AZ featured/mentioned in magazines such as Modified.

XwChriswX · 04-08-2010, 01:11 PM

Quote:

Originally Posted by B1nks

On the west side of what ? If you're talking about the west coast then you're crazy because there are a TON of badass shops there. Also if you're talking about AZ then there are still plenty there. They may not be Z only shops but there have been a few shops in AZ featured/mentioned in magazines such as Modified.

Yeah just West Valley... I live in Avondale, so like anywhere in Surprise or Goodyear, hell Glendale isn't too far of a drive.

Where are they at?

B1nks · 04-08-2010, 01:16 PM

Quote:

Originally Posted by XwChriswX

Yeah just West Valley... I live in Avondale, so like anywhere in Surprise or Goodyear, hell Glendale isn't too far of a drive.

Where are they at?

Hell don't get me lying, I could go back through the Modifieds that I have but that would take FOREVER haha. Maybe I'll look through a couple but I seem to remember something about Scotsdale being one of the locations.

XwChriswX · 04-08-2010, 01:19 PM

Quote:

Originally Posted by B1nks

Hell don't get me lying, I could go back through the Modifieds that I have but that would take FOREVER haha. Maybe I'll look through a couple but I seem to remember something about Scotsdale being one of the locations.

Yeah, Scottsdale's just as far as Chandler lol.

Pablo Z · 04-08-2010, 01:39 PM

Quote:

Originally Posted by XwChriswX

Where are you doing your runs at? Have you gone to any particular shops over there? Being in Chandler you must know of INTENSEMotorsports right? Those guys are awesome!

I wish there were more shops over here on the west side.

Runs were done in Tempe at (S)uperior (R)acing (D)evelopment with Xact Dyno (first listing on UpRev's Web site for Dealers/Tuners) which is in the same shop (separate business run by Tim).
Yes - know about Intense Motorsports' rep.

The guys at SRD are good and not too pricey. Chet the owner is real straight up guy. SRD are also going to start distributing Tony's exhaust (and LTH's no doubt). They sold one to another customer after they saw the quality and heard mine.
As far as what I'm going for with this car - keeping the wife happy

since it's her daily ride. If it was mine I would be going all out (TT kit, hardened tranny, etc) and going to SpeedWorld and Firebird to challenge my old Turbo Regal buddies.

XwChriswX · 04-08-2010, 01:41 PM

Quote:

Originally Posted by Pablo Z

Runs were done in Tempe at (S)uperior (R)acing (D)evelopment with Xact Dyno (first listing on UpRev's Web site for Dealers/Tuners) which is in the same shop (separate business run by Tim).
Yes - know about Intense Motorsports' rep.

The guys at SRD are good and not too pricey. Chet the owner is real straight up guy. SRD are also going to start distributing Tony's exhaust (and LTH's no doubt). They sold one to another customer after they saw the quality and heard mine.
As far as what I'm going for with this car - keeping the wife happy

since it's her daily ride. If it was mine I would be going all out (TT kit, hardened tranny, etc) and going to SpeedWorld and Firebird to challenge my old Turbo Regal buddies.

Dude let me know when and I'll come out with ya! (So long as it's on the weekend since I'd never be able to make it there on a weekday lol)

I need to get a baseline strip number as well...

semtex · 04-08-2010, 01:04 PM

Quote:

Originally Posted by XwChriswX

When it comes to dyno's, can you explain why they are done in the manner they are, neither in the lowest or the highest gear, and why you dont step up through the gears? I never completely understood that...

Someone else could probably explain better, but I'll give it a shot. The purpose of a dyno is to measure power output. Now, the 'cleanest' way to do that is to take the engine out of the car and mount it to an engine dyno. But that's not exactly practical, right? So most people just dyno at the wheels. Not only is it a tad more convenient than taking your engine out, but you're also measuring how much power you're putting to the ground, which many would argue is what counts anyway. So, that being said, you want to get a reading from the wheels while in a gear that provides a 1:1 ratio, because a gear ratio of 1:1 means that the engine and the transmission’s output are moving at the same speed. You want the engine and transmission to be in synch in order to get an accurate reading. Does this make sense at all? Like I said, I'm sure someone else can do a better job of explaining this.

XwChriswX · 04-08-2010, 01:09 PM

Quote:

Originally Posted by semtex

Someone else could probably explain better, but I'll give it a shot. The purpose of a dyno is to measure power output. Now, the 'cleanest' way to do that is to take the engine out of the car and mount it to an engine dyno. But that's not exactly practical, right? So most people just dyno at the wheels. Not only is it a tad more convenient than taking your engine out, but you're also measuring how much power you're putting to the ground, which many would argue is what counts anyway. So, that being said, you want to get a reading from the wheels while in a gear that provides a 1:1 ratio, because a gear ratio of 1:1 means that the engine and the transmission’s output are moving at the same speed. You want the engine and transmission to be in synch in order to get an accurate reading. Does this make sense at all? Like I said, I'm sure someone else can do a better job of explaining this.

LoL I must have made myself sound like a dumbass...

I understand the reason behind a dyno and what it does for you, what I'm asking is why do they pick 1 particular gear (obviously now for the 1:1 ratio thanks semtex!

) But I mean, does that give you the best Total output?

I'm just wondering for 'Practical' output... Say just like you would on a 1/4 mile, do a dyno thats actually going up through the gears just like you would in a race... Or would that be just completely retarded?

semtex · 04-08-2010, 01:25 PM

Quote:

Originally Posted by XwChriswX

LoL I must have made myself sound like a dumbass...

I understand the reason behind a dyno and what it does for you, what I'm asking is why do they pick 1 particular gear (obviously now for the 1:1 ratio thanks semtex!

) But I mean, does that give you the best Total output?

I'm just wondering for 'Practical' output... Say just like you would on a 1/4 mile, do a dyno thats actually going up through the gears just like you would in a race... Or would that be just completely retarded?

If you went up through the gears I think you'd just end up with a separate chart for each gear. Because think about a dyno chart. On the x-axis it has the rpm scale. So you go through 1st gear and there's one graph showing your hp from 2k - 7500 rpm. You shift into 2nd and there's another graph showing hp from 2k - 7500 rpm. And so on and so on. On a 6MT, you'd end up with 6 dyno sheets. 7 for those with the 7AT. As for why they choose the gear with 1:1, I don't think it's so much that it gives you the best numbers, but more that it gives you the most accurate numbers, seeing how engine and transmission speed are in synch with one another.

semtex · 04-08-2010, 01:28 PM

Quote:

Originally Posted by semtex

If you went up through the gears I think you'd just end up with a separate chart for each gear. Because think about a dyno chart. On the x-axis it has the rpm scale. So you go through 1st gear and there's one graph showing your hp from 2k - 7500 rpm. You shift into 2nd and there's another graph showing hp from 2k - 7500 rpm. And so on and so on. On a 6MT, you'd end up with 6 dyno sheets. 7 for those with the 7AT. As for why they choose the gear with 1:1, I don't think it's so much that it gives you the best numbers, but more that it gives you the most accurate numbers, seeing how engine and transmission speed are in synch with one another.

Actually, giving it a little more thought, if you ran through the gears, it look more like 1st gear: 2k - 7500rpm, 2nd gear: 4500 - 7500 rpm, and so on. Because it's not like your rpm is going to drop all the way down to 2k when you shift from one gear to the next at redline. Heck, depending on how quickly you shifted, it might only drop to, say, 5500 rpm.

XwChriswX · 04-08-2010, 01:33 PM

Quote:

Originally Posted by semtex

If you went up through the gears I think you'd just end up with a separate chart for each gear. Because think about a dyno chart. On the x-axis it has the rpm scale. So you go through 1st gear and there's one graph showing your hp from 2k - 7500 rpm. You shift into 2nd and there's another graph showing hp from 2k - 7500 rpm. And so on and so on. On a 6MT, you'd end up with 6 dyno sheets. 7 for those with the 7AT. As for why they choose the gear with 1:1, I don't think it's so much that it gives you the best numbers, but more that it gives you the most accurate numbers, seeing how engine and transmission speed are in synch with one another.

Quote:

Originally Posted by semtex

Actually, giving it a little more thought, if you ran through the gears, it look more like 1st gear: 2k - 7500rpm, 2nd gear: 4500 - 7500 rpm, and so on. Because it's not like your rpm is going to drop all the way down to 2k when you shift from one gear to the next at redline. Heck, depending on how quickly you shifted, it might only drop to, say, 5500 rpm.

So it doesnt just measure the HP/TQ curve as a whole, it just measures a specific gear? I used to think when you saw little dips evenly placed through a dyno, that was a 'gear shift' drop... I didn't know it was only in 1 gear...

04-08-2010, 12:34 PM	#1 (permalink)
XwChriswX WFLYIDNNE Join Date: Jul 2009 Location: In The Fastlane Posts: 50,648 Drives: 02 GDB WRX Rep Power: 453	When it comes to dyno's, can you explain why they are done in the manner they are, neither in the lowest or the highest gear, and why you dont step up through the gears? I never completely understood that... __________________ Bonnie - Stage 2, Audio build coming this fall! R.I.P. Abby 3/29/10 - 3/30/14

04-08-2010, 01:02 PM	#3 (permalink)
XwChriswX WFLYIDNNE Join Date: Jul 2009 Location: In The Fastlane Posts: 50,648 Drives: 02 GDB WRX Rep Power: 453	Where are you doing your runs at? Have you gone to any particular shops over there? Being in Chandler you must know of INTENSEMotorsports right? Those guys are awesome! I wish there were more shops over here on the west side. __________________ Bonnie - Stage 2, Audio build coming this fall! R.I.P. Abby 3/29/10 - 3/30/14

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