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Author Gsi rolling road results
Sly_SRi
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Registered: 9th Apr 04
Location: Reading, UK Drives: Corsa C
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13th Dec 04 at 16:21   View Garage View User's Profile U2U Member Reply With Quote
Wanted to see if my car was down on power or not, did 4 runs:

1st: 123 Bhp! he said it was wheelspinning.
2nd: 100 Bhp, more like it.
3rd: 98 Bhp....
4th: 98 Bhp...which is the one he printed out.



I guess its about normal.....its 10 years old so its bound to be down on power abit, only 6-8 Bhp or so from 106 Bhp (ecotec model). I think its down on torque more though. What is the torque supposed to be for Gsi's?

Corsa C Z20Let

Black Sleeper Turbo Project
Sly_SRi
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Registered: 9th Apr 04
Location: Reading, UK Drives: Corsa C
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13th Dec 04 at 16:22   View Garage View User's Profile U2U Member Reply With Quote
oh yea, at he said for some reason the Bhp Rpm doubles on the reading, its supposed to be around 6000 Rpm, lol! my engine doesn't rev that high

Corsa C Z20Let

Black Sleeper Turbo Project
PaulW
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Registered: 26th Jan 03
Location: Atherton, Greater Manchester
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13th Dec 04 at 16:23   View User's Profile U2U Member Reply With Quote
I'd get it on another rolling road...

if its reading that wrong - the whole setup could be out!
Sly_SRi
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Registered: 9th Apr 04
Location: Reading, UK Drives: Corsa C
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13th Dec 04 at 16:24   View Garage View User's Profile U2U Member Reply With Quote
yea, maybe. He did do it four times to make sure....

Corsa C Z20Let

Black Sleeper Turbo Project
AK
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Registered: 5th Jul 00
Location: Aberdeen City
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13th Dec 04 at 16:24   View User's Profile U2U Member Reply With Quote
why the hell would you even record in 1st and 2nd, and even third.....

heard of places doing it in 3rd..... seems to me to just get a higher reading
Sly_SRi
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13th Dec 04 at 16:25   View Garage View User's Profile U2U Member Reply With Quote
they're the runs, not the gears. he did it in 3rd every time

Corsa C Z20Let

Black Sleeper Turbo Project
AK
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Registered: 5th Jul 00
Location: Aberdeen City
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13th Dec 04 at 16:26   View User's Profile U2U Member Reply With Quote
it should be done in 4th?

So why is it so different for 4 runs? what config did he change etc?
ed
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Registered: 10th Sep 03
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13th Dec 04 at 16:29   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by Adam Kindness
it should be done in 4th?

So why is it so different for 4 runs? what config did he change etc?

The position of the ambient air temp. probe
Teddy
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Registered: 19th Jul 04
Location: Northampton Drives: VW Bora 1.9TDi pd130
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13th Dec 04 at 16:29   View User's Profile U2U Member Reply With Quote
I think when my calibra turbo went on the rollers and he did it in 6th and we was sitting on the slam panel to hold it down - 1.5k rpm hear the turbo start to spool - the noise was amazing until the DV went off in my ear!!! lmao
bradfincham
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Registered: 20th Sep 02
Location: East Of England Drives: Clio 172
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13th Dec 04 at 16:32   View User's Profile U2U Member Reply With Quote
LOL WTF was this rolling road,
they will be never be that far out, and wheelspinning i will be surprised,
we had to hold a 300bhp astra down but a 100 bhp corsa?

I would say go somewhere else mate next time
Ojc
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Registered: 14th Nov 00
Location: Reading: Drives : Clio 197
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13th Dec 04 at 16:32   View User's Profile U2U Member Reply With Quote
Hmm, they sound dodgie

Take it to PTS or Northampton Motorsport
Sly_SRi
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13th Dec 04 at 16:39   View Garage View User's Profile U2U Member Reply With Quote
do you reckon if i go to another rolling road the results will be that different??

Corsa C Z20Let

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bradfincham
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Registered: 20th Sep 02
Location: East Of England Drives: Clio 172
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13th Dec 04 at 16:43   View User's Profile U2U Member Reply With Quote
yes never will you get them so far apart!

Ollie PTS i dont reccomend them either, try power engineering or northampton motorsport
AK
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Location: Aberdeen City
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13th Dec 04 at 16:44   View User's Profile U2U Member Reply With Quote
not much no..... but did they give a reason for 3rd gear run?

Did you notice is spinning? Its not that powerfull a car
Steve
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Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
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13th Dec 04 at 16:46   View Garage View User's Profile U2U Member Reply With Quote
best place near me is powerstation, they fitted my dastek and di rolling road professional they knew they're stuff.

they said most places over calibrate theyre rolling roads to give a false figure to satisfy the customer.

Also after talking to them it really opened my eyes as to what kind of power gains to get from exhausts, air filters etc, not what people think on here let me tell you that
vibrio
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13th Dec 04 at 16:46   View User's Profile U2U Member Reply With Quote
looks fine to me. approx 5% out could be down to anything. old engine, engine in need of service, tyre pressure, hot air, not enough cooling. taking it to another place is not going to do anything
3CorsaMeal
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13th Dec 04 at 16:50   View User's Profile U2U Member Reply With Quote
vibrio is living in the real world
stevenford_uk
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Registered: 6th Dec 04
Location: Wrexham
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13th Dec 04 at 16:54   View User's Profile U2U Member Reply With Quote
thats interesting.
was that at the wheels or at the flywheel?
doesn't say if it was corrected or not.
my brothers nova td put out 110bhp and 128 ftlbs torque.
i will dig out the graphs if i can find them.
vibrio
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13th Dec 04 at 16:55   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by 3CorsaMeal
vibrio is living in the real world


I so wish to be a chav
micra_pete
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Registered: 23rd Apr 03
Location: West Yorkshire
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13th Dec 04 at 16:56   View Garage View User's Profile U2U Member Reply With Quote
quote:
they said most places over calibrate theyre rolling roads to give a false figure to satisfy the customer.


quote:
looks fine to me. approx 5% out could be down to anything. old engine, engine in need of service, tyre pressure, hot air, not enough cooling. taking it to another place is not going to do anything


listen to these men.

both different points, both very true.

btw 5% out is nothing,

people see rolling roads as fact, they are not, the thing rolling roads are good for is an estimate of power, you should also always ask for wheel figures, is this is the figure that should really count to you

or a comparison between modifications on the same rolling road, this can be annoying however when a rolling road re-calibrates

Colin
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Registered: 4th Apr 02
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13th Dec 04 at 17:00   View User's Profile U2U Member Reply With Quote
Wheelspinning A gsi couldnt pull the skin off a rice pudding nevermind wheelspin in 3rd
stevenford_uk
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Registered: 6th Dec 04
Location: Wrexham
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13th Dec 04 at 17:02   View User's Profile U2U Member Reply With Quote
very true, lol
mav
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Registered: 19th Jun 01
Location: Scotland
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13th Dec 04 at 17:05   View User's Profile U2U Member Reply With Quote
heres a graph form my 1.6 sport when i had it...same ecotec engine as your gsi...



had it rollin roaded twice...few months apart at same place....
once got 113bhp and other time 118bhp....car was no different apart from b4 118 run was givin full service..

full s/s magnex zorst with decat and induction kit with heatshield..

think his rollers read a tad high

[Edited on 13-12-2004 by mav]
Steve
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Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
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13th Dec 04 at 17:06   View Garage View User's Profile U2U Member Reply With Quote
^^ prime example over overcalibrating
mav
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13th Dec 04 at 17:10   View User's Profile U2U Member Reply With Quote
^^^^^^^^

yep was told by another garage he had his rollers set to read high to please the scooby club cause they moaned about low readings....

defeats the object I think

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