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

semtex · 04-09-2010, 12:28 PM

Quote:

Originally Posted by XwChriswX

OH ok. I thought you wanted it to 'keep' pulling, so going up on the scale. See like I said, I'm pretty low on knowlege of the science of dynos lol I just know higher numbers = good (minus practicality)

Right. A flat torque curve means that it keeps pulling. A torque curve that goes up means that as rpms build, it pulls at a higher rate. You'd see that with many turbo apps -- as the turbo spools up, the torque increases, but prior to the spool-up there's not much torque (aka turbo lag). Now, what concerns me about Pablo's curve is that, based on how the curve drops off at 5k, it means that as his rpms climb from 5-7.5k, his car is actually decreasing its rate of pull.

XwChriswX · 04-09-2010, 12:30 PM

Quote:

Originally Posted by semtex

Right. A flat torque curve means that it keeps pulling. A torque curve that goes up means that as rpms build, it pulls at a higher rate. You'd see that with many turbo apps -- as the turbo spools up, the torque increases, but prior to the spool-up there's not much torque (aka turbo lag). Now, what concerns me about Pablo's curve is that, based on how the curve drops off at 5k, it means that as his rpms climb from 5-7.5k, his car is actually decreasing its rate of pull.

Is that a 7AT problem? Or something specific to his runs? I hope all 7ATs arent like that... That would piss me off. lol

You Smoke a CRX to see him putt putt putt past you just before the 1/4 mile lol

semtex · 04-09-2010, 12:42 PM

Quote:

Originally Posted by XwChriswX

Is that a 7AT problem? Or something specific to his runs? I hope all 7ATs arent like that... That would piss me off. lol

You Smoke a CRX to see him putt putt putt past you just before the 1/4 mile lol

Well that's why I posted wstar's dyno sheet a couple of posts above. Did you miss that? lol

semtex · 04-09-2010, 12:18 PM

I found wstar's dyno sheet (also 7AT). It's flat for his 7AT as well.

vipor · 04-09-2010, 02:01 PM

That's still a LOT of fall off after the 5250 (crossover on a NA) mark.

Did the A/F go back up to 13 at that point or something?

semtex · 04-09-2010, 02:16 PM

Quote:

Originally Posted by vipor

That's still a LOT of fall off after the 5250 (crossover on a NA) mark.

Did the A/F go back up to 13 at that point or something?

Actually, I think it looks right. It just looks a little exaggerated due to the scale. The y-axis is in 10 lb-ft increments, so even relatively minor changes will look a little bigger. Also, compare his graph with wstar's. Notice that the y-axis on wstar's graph is in increments of 40 lb-ft. And also notice that both curves end at 200 lb-ft @ 7500 rpm. In fact, if you look at 5k rpm, Pablo is making more tq (probably due to his tune).

vipor · 04-09-2010, 02:54 PM

per 500rpm from 5000 the first drops 5, 10, 5, 15, 15 - (35ft/lbs by 7000, 50 by 7500)

per 500rpm from 5000 the second drops <5, ~5, ~0, ~5, ~25 - (<15ft/lbs by 7000, ~40 by 7500)

"~" means "approximately" by the by

semtex · 04-09-2010, 03:00 PM

I know what ~ means! (And it's called a tilde.)

Yeah I'm not saying they're identical. Pablo's curve still isn't as flat as I'd expect it. I'm just saying it's not as bad as it might initially look is all.

vipor · 04-09-2010, 03:14 PM

A lot of people are confused by that symbol for some reason, just makin sure

It just still seems to be a lot of fall-off percentage-wise.

semtex · 04-09-2010, 03:16 PM

I wonder if the type of dyno has anything to do with it. This was one of those funky hydraulic dynos, after all.

04-09-2010, 12:18 PM	#4 (permalink)
semtex A True Z Fanatic Join Date: Jan 2009 Location: Behind enemy lines Age: 54 Posts: 5,995 Drives: People to drink Rep Power: 33	I found wstar's dyno sheet (also 7AT). It's flat for his 7AT as well. __________________ "There are no small accidents on this circuit." -- Ayrton Senna 316.8whp & 248 ft/lbs (Dyno Dynamics) \| 319whp & 256 ft/lbs (DynoJet) (04/23/10) Stillen G3 CAI, CBE, Pulley / F.I. LTH / GTSpec Ladder Brace / Setrab Oil Cooler / UpRev-tuned by Forged Perf.

04-09-2010, 02:01 PM	#5 (permalink)
vipor A True Z Fanatic Join Date: Aug 2009 Location: Euless, TX [ DFW ] Age: 43 Posts: 13,531 Drives: Nismo 09-0183 QAB Rep Power: 49	That's still a LOT of fall off after the 5250 (crossover on a NA) mark. Did the A/F go back up to 13 at that point or something? __________________ 2009 NISMO # 0193 \| QAB \| Albums! \| 05.04.10 (Dynojet) 291.94hp/248.28tq Oil Cooler (DIY) \| Custom Headlights \| GTSPEC Braces \| F.I. Long Tube Headers

04-09-2010, 02:54 PM	#7 (permalink)
vipor A True Z Fanatic Join Date: Aug 2009 Location: Euless, TX [ DFW ] Age: 43 Posts: 13,531 Drives: Nismo 09-0183 QAB Rep Power: 49	per 500rpm from 5000 the first drops 5, 10, 5, 15, 15 - (35ft/lbs by 7000, 50 by 7500) per 500rpm from 5000 the second drops <5, ~5, ~0, ~5, ~25 - (<15ft/lbs by 7000, ~40 by 7500) "~" means "approximately" by the by __________________ 2009 NISMO # 0193 \| QAB \| Albums! \| 05.04.10 (Dynojet) 291.94hp/248.28tq Oil Cooler (DIY) \| Custom Headlights \| GTSPEC Braces \| F.I. Long Tube Headers

04-09-2010, 03:00 PM	#8 (permalink)
semtex A True Z Fanatic Join Date: Jan 2009 Location: Behind enemy lines Age: 54 Posts: 5,995 Drives: People to drink Rep Power: 33	I know what ~ means! (And it's called a tilde.) Yeah I'm not saying they're identical. Pablo's curve still isn't as flat as I'd expect it. I'm just saying it's not as bad as it might initially look is all. __________________ "There are no small accidents on this circuit." -- Ayrton Senna 316.8whp & 248 ft/lbs (Dyno Dynamics) \| 319whp & 256 ft/lbs (DynoJet) (04/23/10) Stillen G3 CAI, CBE, Pulley / F.I. LTH / GTSpec Ladder Brace / Setrab Oil Cooler / UpRev-tuned by Forged Perf.

04-09-2010, 03:14 PM	#9 (permalink)
vipor A True Z Fanatic Join Date: Aug 2009 Location: Euless, TX [ DFW ] Age: 43 Posts: 13,531 Drives: Nismo 09-0183 QAB Rep Power: 49	A lot of people are confused by that symbol for some reason, just makin sure It just still seems to be a lot of fall-off percentage-wise. __________________ 2009 NISMO # 0193 \| QAB \| Albums! \| 05.04.10 (Dynojet) 291.94hp/248.28tq Oil Cooler (DIY) \| Custom Headlights \| GTSPEC Braces \| F.I. Long Tube Headers

04-09-2010, 03:16 PM	#10 (permalink)
semtex A True Z Fanatic Join Date: Jan 2009 Location: Behind enemy lines Age: 54 Posts: 5,995 Drives: People to drink Rep Power: 33	I wonder if the type of dyno has anything to do with it. This was one of those funky hydraulic dynos, after all. __________________ "There are no small accidents on this circuit." -- Ayrton Senna 316.8whp & 248 ft/lbs (Dyno Dynamics) \| 319whp & 256 ft/lbs (DynoJet) (04/23/10) Stillen G3 CAI, CBE, Pulley / F.I. LTH / GTSpec Ladder Brace / Setrab Oil Cooler / UpRev-tuned by Forged Perf.

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