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Info: Roll-on tests result: stock chip vs. G chip + Euro throttle body

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[gti-vr6] G chip + Euro TB = no gain??? aqn@dev.tivoli Thu, 23 Apr 1998 22:46:28 -0500 (CDT)
[gti-vr6] My car is getting slower and slower with more mods! |-) aqn@dev.tivoli Thu, 30 Apr 1998 08:26:11 -0500 (CDT)



From aqn@dev.tivoli Thu Apr 23 22:46:28 -0500 1998
From: aqn@dev.tivoli
To: gti-vr6@dev.tivoli
Subject: [gti-vr6] G chip + Euro TB = no gain???
Date: Thu, 23 Apr 1998 22:46:28 -0500 (CDT)
 
  As promised, here are the first set of results from my before/after
  tests.  Up to now, my engine has been stock, save for the removed
  snow screen.  I have just installed an Euro TB and a G chip.

  The short form:  mid-range roll-on acceleration tests showed no
  improvement.

  I think I really need a K+N to take full advantage of the chip &
  the TB.  That's logical, actually, since the TB can't do anything
  if there is the same restriction (the stock air filter) upstream
  as with the stock TB.  Also, the G chip only works off of the
  amount flowed through the system, and the stock filter is
  restricting the flow & not allowing the G chip to do enough
  magic.  (I already ordered a K+N stock replacement filter last week
  from Pep Boys, and am hoping to get get it before the autox this
  Sunday.)

  Of course, that begs an obvious question:  if I had gone to the
  K+N filter as the ONLY upgrade, how much improvement will I see?

  The throttle response DID feel better, but that could have been
  because I removed a bit of slack from the throttle cable!


  Anyway, here's the nitty gritty of the tests if anyone is interested:

  My roll-on tests are timed runs between two RPM points, in specific
  gears:  second gear, from 2k to 5k, and third gear, from 2k to 4k.
  A bigger range may be more meaningful, but for my purpose (auto-xing),
  those are the RPM range where gains are the most important to me.
  Also, I couldn't do tests in higher gears, because I didn't want to
  be caught in possession of 5000 rpm in fourth or fifth gear on the
  street!  |-)

  The street I did the tests on is a wide, fairly new 6 lane (3 each
  way) divided street, no shops or residences on either side.  The two
  way-ness allows me to run tests in both directions to even out
  the effect of elevation changes, as well as wind & air conditions,
  etc.  The streets are punctuated by left-turn lanes at decent
  intervals so I can turn around quickly w/o having to wait at a
  light (too time consuming).

  I did 12 runs of each test, 6 in each directions.  I cruised at the
  start RPM (2k) making sure that the car is neither accelerating or
  decelerating, then I floored the gas and hit the stopwatch.
  I stopped th watch when the needle hit the target RPM (4k or 5k).
  I threw out the slowest and fastest times, and averaged the rest.

  I took care to make sure that the car has more or less the same
  amount of gas, the same tire pressures, and the same configurations
  e.g. no lights, no fans, no radio (!), etc.

  The results w/ G chip & Euro TB were about a couple of hundreds
  of a second slower than stock i.e. WAY inside the "noise" range of
  the results and not a distinct gain or loss.


  Here are my notes:

    =========  04/20/98  ==========================================================

    o   All accessories off (no lights, no fan).
	2nd gear, 2000rpm - 5000rpm
	Low & high times (in []'s) omitted from calculation of averages
	Steady at 2k, then floor throttle + start stopwatch;  stop watch at 5k.

    o   Low & high times are in []'s;  they are omitted from the calculation
	of the average.

    o   Ambient temperature readings are from the MFA.

    -------------------------------------------------------------------------------

    o   Stock:

	98/04/20 12:15
	Fuel:  3/4 tank
	Temp.:	75 (start),  78-79 (end)
	Wind 6mph out of S
	Rel. humidity: 62%
	Sunny
	Road: dry

	2nd gear  2000-5000

	Direction #1 (JR BMW -> Braker)
	    5.41 [5.12] 5.25 5.28 5.19 5.22 / 5.270

	Direction #2 (Braker -> JR BMW)
	    5.44 [5.53] 5.21 5.44 5.41 5.28 / 5.356

	2nd gear  2000-5000,  average: 5.313 secs

    =========  04/20/98  ==========================================================

    o   Stock:

	98/04/21 19:00
	Fuel:  3/4 tank
	Temp.:	68 (start),  68 (end)
	Wind 12mph out of N
	Rel. humidity: 32%
	Sunny
	Road: dry

	3rd gear  2000-4000

	Direction #1 (JR BMW -> Braker)
	    8.31 [8.55] 8.03  8.34  8.50  8.35  / 8.30600

	Direction #2 (Braker -> JR BMW)
	    8.31 [7.53] 8.31  8.44  8.19  8.31  / 8.31200

	3rd gear  2000-4000,  average: 8.309 secs

    =========  04/22/98  ==========================================================

    o   Tests with Euro throttle body & G chip:

	98/04/22 12:00
	Fuel:  5/8 tank
	Temp.:	70 (start),  75 (end)
	Wind 0mph
	Rel. humidity: 28%
	Sunny
	Road: dry

    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	2nd gear  2000-5000

	Direction #1 (JR BMW -> Braker)
	    5.41* 5.35  5.37 [5.38] x.xx  5.31  5.13  5.32  5.29  / 5.296 (5.295 incl. last run)

	Direction #2 (Braker -> JR BMW)
	    5.50* 5.35  5.32  x.xx  5.41  5.19 [5.03] 5.31  5.35  / 5.316 (5.321 incl. last run)

	*  first set of runs doesn't count 'cause I had the vent fan on.

	2nd gear  2000-5000,  average: 5.306 secs (5.308 secs incl. last run)


    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	3rd gear  2000-4000

	Direction #1 (JR BMW -> Braker)
	    8.56  8.35  8.50  8.53  8.69* 8.69  x.xx  / 8.552

		    * I had the vent fan on this run.

	Direction #2 (Braker -> JR BMW)
	    8.00  8.54 [8.06] 8.25  8.19 [8.85] 8.25  / 8.246

	3rd gear  2000-4000,  average: 8.399 secs

    -------------------------------------------------------------------------------

- --
Andy Nguyen \ &#97;qn&#64;tivoli<img src=/i/dc.gif border=0 width=35 height=15> \ Tivoli Systems, Austin, TX \ 512.436.8229
	Ave, XTela, morituri te salutamus.
- --
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    list archive, etc.  see:   http://www.panix.com/~aqn/gti_vr6_list/









From aqn@dev.tivoli Thu Apr 30 08:26:11 -0500 1998
From: aqn@dev.tivoli
To: gti-vr6@dev.tivoli
Subject: [gti-vr6] My car is getting slower and slower with more mods! |-)
Date: Thu, 30 Apr 1998 08:26:11 -0500 (CDT)
 
  My car is getting slower and slower with more mods!  |-)

  I borrowed a K+N filter from a local list member (thanks, Zeek!) for
  last Sunday's autox and to do more tests.  I did the usual 2nd gear
  2000-5000 roll-on test, and the car is even slower than w/o the
  filter!

  I wonder if my 2k-5k roll-on test is meaningful and its result is
  reliable, or if there is something wrong with the test and the
  result is meaningless...


  To recap:
				   Stock:	5.313 secs
        With Euro Throttle body + G chip:	5.306 secs
  With Euro Throttle body + G chip + K+N:	5.505 secs


  Here are the details of the last test:

    Tests with Euro throttle body & G chip & K+N stock repl. filter:

    98/04/28 12:30
    Fuel:  full tank
    Temp.:	69 (start),  71 (end)
    Wind 12mph from N
    Rel. humidity: 51%
    Sunny
    Road: dry

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    2nd gear  2000-5000-6000

    Direction #1 (Braker -> JR BMW)
	5.74  5.46  5.36  5.43  5.46 [5.39] / 5.49000
	7.22  7.09 [7.03] 7.06  7.16  7.06  / 7.11800

    Direction #2 (JR BMW -> Braker)
	5.62  5.42  5.52  5.52  5.52 [5.74] / 5.52000
	7.32  7.12  7.34  7.44  7.47 [7.56] / 7.33800

    2nd gear  2000-5000,  average: 5.505 secs
    2nd gear  2000-6000,  average: 7.228 secs


  [ I just read the stopwatch's "manual" and figured out the 1-2 timing
  feature, so I used it to time 2nd gear runs up to 5k AND 6k.  When I
  get my stock TB back I will do more tests to see if the 6k figures
  reveal anything. ]


- --
Andy Nguyen \ &#97;qn&#64;tivoli<img src=/i/dc.gif border=0 width=35 height=15> \ Tivoli Systems, Austin, TX \ 512.436.8229
	Ave, XTela, morituri te salutamus.
- --
For info on: how to subscribe & unsubscribe, the list's mailing errors,
    list archive, etc.  see:   http://www.panix.com/~aqn/gti_vr6_list/






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