FATS to ave HP and 60-90 MPH Converter Graph

rktskicar · 10-02-2005, 01:43 PM

I have heard a fair amount of stuff lately about how FATS is related to standard benchmarks like 60-90 MPH or HP. This graph shows the relationship between FATS time, road horsepower, wheel horsepower and crank HP as well as 60-90 MPH time all in one place. It is based on the average HP over the 4200-6500 FATS RPM range. For example, If you have a 5 sec FATS time, then the 60-90 MPH time would be about 4.5 sec and your average wheel horsepower over 4200-6500 RPM range on a dyno should be about 268 WHP.

There are three kinds of HP curves on this graph:
RHP- Road Horsepower measured with FATS or Gtech
WHP- Wheel Horsepower measured with dyno
CHP- Crank Horsepower

An example of the defintion of Ave HP is show in the link below. Note that the previous GIAC-X puts out about 274.5 HP peak on my car, but only 257.9 HP averaged over 4200-6500 RPM range. It is easiest to average the HP over the RPM range if you have the source data, but could be eyeballed from dyno graphs.

Bruce

Sample HP curves showing average and peak HP

BlackS4tt (Josh) · 10-02-2005, 01:48 PM

Arcteryx::Stock Rods · 10-02-2005, 01:51 PM

PSmalls::DoggieStyle · 10-02-2005, 01:54 PM

The difference is that you guys use a weight ~3800, whereas I bet my car with me in it is ~3650.

BlackS4tt (Josh) · 10-02-2005, 02:22 PM

rktskicar · 10-02-2005, 02:29 PM

close to 3800 lbs. It's just a spreadsheet, I can generate these curves for any vehicle weight.

Bruce

davenew · 10-02-2005, 03:02 PM

tusca · 10-02-2005, 03:37 PM

If not, I completely understand.

PSmalls::DoggieStyle · 10-02-2005, 03:39 PM

lighter cat-back exhaust, lighter DPs, lighter brakes, lighter wheels, no spare, lighter battery, etc, etc etc.

PSmalls::DoggieStyle · 10-02-2005, 03:50 PM

10-02-2005, 01:43 PM	#1
rktskicar AudiWorld Super User Account #: 44443 Join Date: Oct 2002 Posts: 8,592	FATS to ave HP and 60-90 MPH Converter Graph I have heard a fair amount of stuff lately about how FATS is related to standard benchmarks like 60-90 MPH or HP. This graph shows the relationship between FATS time, road horsepower, wheel horsepower and crank HP as well as 60-90 MPH time all in one place. It is based on the average HP over the 4200-6500 FATS RPM range. For example, If you have a 5 sec FATS time, then the 60-90 MPH time would be about 4.5 sec and your average wheel horsepower over 4200-6500 RPM range on a dyno should be about 268 WHP. There are three kinds of HP curves on this graph: RHP- Road Horsepower measured with FATS or Gtech WHP- Wheel Horsepower measured with dyno CHP- Crank Horsepower An example of the defintion of Ave HP is show in the link below. Note that the previous GIAC-X puts out about 274.5 HP peak on my car, but only 257.9 HP averaged over 4200-6500 RPM range. It is easiest to average the HP over the RPM range if you have the source data, but could be eyeballed from dyno graphs. Bruce Sample HP curves showing average and peak HP __________________ Stock 010 6MT Blue Sprint B8 S4. Premium +, Sport diff, B&O BBS CH, 255/40/18 Bridgetstone RE960 AS 01.5 6MT ASP Stage 3 S4 (sold 9/25/09)

10-02-2005, 01:48 PM	#2
BlackS4tt (Josh) AudiWorld Super User Account #: 68919 Join Date: Jan 2004 Posts: 8,882	awesome! thanks! __________________ ================================================== ============= Email: blacks4tt AT yahoo.com VAST Tuned Stage III, Blouch 997 KO4s, Custom FMIC, Stoptech, OZ

10-02-2005, 01:51 PM	#3
Arcteryx::Stock Rods Senior Member Account #: 70072 Join Date: Feb 2004 Posts: 8,197	golf clap. __________________ Bored 2.8/9.1CR JE Pistons/034 Rods/RS4 Heads KO4's Port Polished/VAST Meth Injection RS4 Intake Manifold/Throttle Body X-1 Intake/ER IC's ASP Exhaust Heads to Tips Clutchmaster Stage IV with LWFW STaSIS Ohlins 700/800 AWE DTS Alcons 355 6 Piston BBK

10-02-2005, 01:54 PM	#4
PSmalls::DoggieStyle Elder Member Account #: 69223 Join Date: Jan 2004 Posts: 30,285	Interesting. As far as I can tell, that seems to jive with most of Nyet's HP estimates. The difference is that you guys use a weight ~3800, whereas I bet my car with me in it is ~3650.

10-02-2005, 02:22 PM	#5
BlackS4tt (Josh) AudiWorld Super User Account #: 68919 Join Date: Jan 2004 Posts: 8,882	im sure your car, with anyone else in it, would be 3800 __________________ ================================================== ============= Email: blacks4tt AT yahoo.com VAST Tuned Stage III, Blouch 997 KO4s, Custom FMIC, Stoptech, OZ

10-02-2005, 02:29 PM	#6
rktskicar AudiWorld Super User Account #: 44443 Join Date: Oct 2002 Posts: 8,592	2nd. Standard weight for most people excluding Doc and people with stripped interiors should be.. close to 3800 lbs. It's just a spreadsheet, I can generate these curves for any vehicle weight. Bruce __________________ Stock 010 6MT Blue Sprint B8 S4. Premium +, Sport diff, B&O BBS CH, 255/40/18 Bridgetstone RE960 AS 01.5 6MT ASP Stage 3 S4 (sold 9/25/09)

10-02-2005, 03:02 PM	#7
davenew AudiWorld Super User Account #: 70028 Join Date: Feb 2004 Posts: 7,828	yea, my car, (no spare, without me) was 3500 lb on a truck scale __________________ '00 S4 EPL Stg 3 (March'04-May'08) '08 BMW 135i Dinan Stg 2 (May'08-Present) '00 S4 Imola widebody AWE Stg 3 (Bought Nov'08. AWE stg 3 kit is sold.. I'm switching over to ASP GT soon)

10-02-2005, 03:37 PM	#8
tusca Junior Member Account #: 87522 Join Date: Feb 2005 Posts: 568	Nice work. Would you mind sharing the spreadsheet (I am an Excel junkie as well)? If not, I completely understand.

10-02-2005, 03:39 PM	#9
PSmalls::DoggieStyle Elder Member Account #: 69223 Join Date: Jan 2004 Posts: 30,285	Umm, no. My car has weight reduction and probably weighs ~3500 with no driver. lighter cat-back exhaust, lighter DPs, lighter brakes, lighter wheels, no spare, lighter battery, etc, etc etc.

10-02-2005, 03:50 PM	#10
PSmalls::DoggieStyle Elder Member Account #: 69223 Join Date: Jan 2004 Posts: 30,285	Please do the same for ~3650 if you wouldn't mind. I'd really appreciate it.

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