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how does the dyno figure out DTL?

Posted by: Andrew C. on 2006-01-17 16:53:15
Account #: 560

In Reply to: its not linear, but its definitely not less than linear either posted by nyet on 2006-01-17 16:46:49

- Andrew C.

now: 01.5 S4 Avant Pearl/Onyx Widebody
was: 98.5 A4 2.8 QMS Pearl/Ecru

Pearl White S4 Frappr

Thread:

Can 440cc/min injectors @ 4 bar (~510cc/min) support 600+ chp? - PiggieSmalls 2006-01-17 10:14:46 (753 views)

Yes. - Chuck-S4 2006-01-17 19:40:01 (178 views)

NM you edited. - Hal_S4Shizzle::CBP 2006-01-17 11:20:59 (117 views)

i have been trying to tell people - Snow Trooper Is Numb 2006-01-17 10:41:52 (337 views)

"is not having a fine oil mist in the intake anymore" what is this oil you speek of? - EdyJun 2006-01-17 12:20:50 (173 views)

yes, our cars have massive amounts of blow by and our PCV system likes to take lots of oil with - Snow Trooper Is Numb 2006-01-17 13:02:24 (186 views)

IAT's up? you mean down right? ;) - Imolavirus:Infected 2006-01-17 10:44:31 (115 views)

yeah, LOL edit coming soon.... - Snow Trooper Is Numb 2006-01-17 10:50:48 (105 views)

IMO, ASP adresses this with fuel delivery. - RSform 2006-01-17 10:35:32 (253 views)

Several of the cars I was referring to in my original post have an upgraded pump (Walbro mostly). - PiggieSmalls 2006-01-17 10:52:56 (106 views)

it would be interesting to see what your car did with alcy injection on pump gas - Snow Trooper Is Numb 2006-01-17 10:55:45 (145 views)

our big blue friend should have his alcy injection set up soon. - mjtaylor 2006-01-17 11:04:02 (136 views)

i have the peices on their way, i think it is better than race gas for obvious reasons - Snow Trooper Is Numb 2006-01-17 11:17:20 (85 views)

Not attempt, it is needed. Quick calcs showed a min. of 185lt/hr fuel flow at full load - Mark@AutoSpeed 2006-01-17 10:40:01 (115 views)

What is the stock fuel pump delivery at? - RSform 2006-01-17 11:45:23 (86 views)

127lph IIRC - [badmoonrising] 2006-01-17 11:48:51 (90 views)

What is the fuel delivery for RS4 injectors and 5bar FPR? - [badmoonrising] 2006-01-17 10:38:46 (147 views)

Stop worrying at 5bar even, 255lph is a plenty! =) - Mark@AutoSpeed 2006-01-17 10:40:48 (113 views)

Ok ;) Did you get my email from yesterday? - [badmoonrising] 2006-01-17 10:44:53 (83 views)

Yes. - Mike2kS4 2006-01-17 10:31:14 (210 views)

Care to elaborate? ;-) - PiggieSmalls 2006-01-17 10:53:36 (80 views)

FWIW our DC% is approx. 100% at 5500, then 105% (6000) to a taper 98% by 7000... - Mark@AutoSpeed 2006-01-17 10:30:19 (223 views)

Any plans to share logs (graphs please) with AW S4 forum? - PiggieSmalls 2006-01-17 10:47:18 (144 views)

Understand and will try to get some charts together once the weather breaks a little, still icy here - Mark@AutoSpeed 2006-01-17 10:54:53 (96 views)

Thanks, Mark. I hope you're not taking offense to my posts. I highly respect what you've done. - PiggieSmalls 2006-01-17 11:03:41 (92 views)

No, no hard feelings. Always good to gather info it's just the speculation that makes me giggle. - Mark@AutoSpeed 2006-01-17 11:11:56 (94 views)

I have something that will change the giggle to a "ouch" and a man hopping on one foot! - Milpitas2.7T 2006-01-17 14:56:23 (114 views)

The S4 seems almost magical in its fueling abilities... - DAP 2006-01-17 10:29:24 (300 views)

I don't doubt that at all, just find it hard to believe that they're making 600+ chp. - PiggieSmalls 2006-01-17 10:50:48 (183 views)

More data is always better but don't see why you'd doubt the dyno results. - DAP 2006-01-17 11:09:01 (142 views)

Right or wrong, I have a problem with accepting conversion factors and/or drive train losses. Sorry. - PiggieSmalls 2006-01-17 11:14:15 (92 views)

I have a problem with DTL% too...I don't really think it's a %, more like a fixed # of HP... - box_of_partS4 2006-01-17 11:46:37 (122 views)

i really dont get where this internet fallacy came from. - nyet 2006-01-17 16:48:16 (108 views)

So then just go by the wheel hp numbers. ~490whp is impressive, no? - DAP 2006-01-17 11:15:47 (89 views)

490whp = 628chp@22%DTL, 597chp@18%, 544chp@10%... - davenew 2006-01-17 14:05:55 (127 views)

Sounds impressive, but only if it is in reference to something. What is stock on that dyno? - t.arrows 2006-01-17 11:39:16 (119 views)

A well-running stock S4 did ~213 on the same dyno. - DAP 2006-01-17 11:43:35 (86 views)

Thanks!! But that means the ASP kit is 575 crank hp, no? 250/213=1.17, 1.17*490=575 - t.arrows 2006-01-17 11:56:21 (398 views)

Dunno if that makes it more palatable for Piggiesmalls? Yes, but still want to see more info... - PiggieSmalls 2006-01-17 12:13:59 (92 views)

I think a lot of people are missunderstanding what your thread is about..... - Imolavirus:Infected 2006-01-17 12:21:03 (124 views)

Mostly yes, but I am a tiiiiiiiiiiiiiiiny bit skeptcial of 630chp..... - PiggieSmalls 2006-01-17 12:29:36 (136 views)

i agree that the drivetrain loss cant possibly be linear - Snow Trooper Is Numb 2006-01-17 13:12:53 (122 views)

its not linear, but its definitely not less than linear either - nyet 2006-01-17 16:46:49 (101 views)

Care to define "less than linear"? There is no way the drivetrain is causing the same - box_of_partS4 2006-01-17 19:26:01 (92 views)

less than linear meaning second order effects and higher are not monotonically increasing with power - nyet 2006-01-17 22:50:34 (89 views)

how does the dyno figure out DTL? - Andrew C. 2006-01-17 16:53:15 (70 views)

after the run is over it lets the rollers slow down on their own - nyet 2006-01-17 16:58:48 (107 views)

it cant, that is impossible to know 100% for sure - Snow Trooper Is Numb 2006-01-17 16:54:33 (71 views)

thats what i am getting it, it isnt a science so it is basically just guessing - Snow Trooper Is Numb 2006-01-17 16:48:25 (75 views)

no......still too much GB and other work to sneak away :/ - Imolavirus:Infected 2006-01-17 12:38:03 (78 views)

big control 7 towards u - BUFFALONOGAROpebFATS 2006-01-17 13:11:08 (75 views)

2nd, but more fun for us I guess. ;-) - PiggieSmalls 2006-01-17 13:31:56 (94 views)

250 is a pretty conservative number for a stock S4... - DAP 2006-01-17 12:02:09 (123 views)

I agree, but isn't 250 crank hp the number APR and AWE are using to base - t.arrows 2006-01-17 12:05:55 (116 views)

that equasion is wrong. - mjtaylor 2006-01-17 12:00:12 (84 views)

if 250 is right for stock, then that equation is AOK. maybe 1.17371 suits you better? - Andrew C. 2006-01-17 12:03:41 (82 views)

How? 250= claimed crank hp from the factory for S4. - t.arrows 2006-01-17 12:03:09 (108 views)

250/213=1.17 but that doesnt mean you can just multiply 490 by 1.17 to get the chp number... - mjtaylor 2006-01-17 12:06:16 (113 views)

I think you're wrong. The math has to be the same both ways: - t.arrows 2006-01-17 12:11:13 (114 views)

yeah i may well be. - mjtaylor 2006-01-17 12:17:20 (98 views)

Abso-fvcking-lutely. I'm in no way trying to take away from what Mark has done. - PiggieSmalls 2006-01-17 11:17:31 (120 views)

Why would the dyno numbers be less valid/important than logs? - DAP 2006-01-17 10:55:59 (116 views)

I'm not claiming that one is less valid/important than the other.... - PiggieSmalls 2006-01-17 11:02:08 (127 views)

Oops... reply above was supposed to go here... too lazy to fix. :P - DAP 2006-01-17 11:09:47 (83 views)

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