Dodgy rolling road toady...
26-11-2005, 07:34 PM
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Dodgy rolling road toady...
My mates LET Corsa went on a set of rollers today. I deffo think there was something fishy going on! 
The car at the moment only revs to 7500rpm. But his power figure was 257bhp at 8450rpm. He said to me he thought he didn't rev the car past 5k. I looked at his graph and the bhp and torque lines don't even cross. So deffo under 5252rpm.
Also does it matter what gear the car is run up in? His was run up in 5th, all others in 4th?
I'll name and shame them in a bit!
The car at the moment only revs to 7500rpm. But his power figure was 257bhp at 8450rpm. He said to me he thought he didn't rev the car past 5k. I looked at his graph and the bhp and torque lines don't even cross. So deffo under 5252rpm.
Also does it matter what gear the car is run up in? His was run up in 5th, all others in 4th?
I'll name and shame them in a bit!
26-11-2005, 07:43 PM
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let is the serial number for the 2 litre turbo engine isnt it correct me if im wrong, it will be C20LET for a calibra turbo lump
then the N/A lump will be C20XE if you wondered
then the N/A lump will be C20XE if you wondered
26-11-2005, 07:53 PM
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Yeah sorry Rudey! Its an old Vaux 2.0 16v Turbo.
You can break the code down, it does have a meaning!
C = Catilyser
20 = Engine size
L = Compression (relates to a number think LET's are 9:1, but the L stands for 9:1 - 9.5:1)
E = European market (I think)
T = Turbocharger
New Vaux 2.0 16v Turbos are Z20LET
A Lotus Carlton is a C36GET. It is lower compression than a LET, and a 3.6
Like Pete says the best N/A 2.0 is the C20XE, but newer ones are a C20NE, not as good (Ecotech)
You can break the code down, it does have a meaning!
C = Catilyser
20 = Engine size
L = Compression (relates to a number think LET's are 9:1, but the L stands for 9:1 - 9.5:1)
E = European market (I think)
T = Turbocharger
New Vaux 2.0 16v Turbos are Z20LET
A Lotus Carlton is a C36GET. It is lower compression than a LET, and a 3.6
Like Pete says the best N/A 2.0 is the C20XE, but newer ones are a C20NE, not as good (Ecotech)
26-11-2005, 08:05 PM
#5
The Engine Speed figure depends on what they used to set the RPM of the Rollers against. Has the car got an accurate Tacho?
The peak RPM figure of 8450 is VERY concerning, but a discrepancy there explains why the graph isnt as expected.
The mention of 5k, where did that come from? Are you saying that he thinks that the car didn't exceed 5k on that run? That's unlikely. A run would normally only end if.....
1. The Rev Limit is reached
2. The car stops making power
4. The operator aborts the run (if he hears Det or if the car is unstable on the rollers etc)
3. It self-destructs
However, the lines crossing depends TOTALLY on the configuration of the Graph. They will only cross if the Axis' are equal.
Post the graph so we can make some sense of it.
The peak RPM figure of 8450 is VERY concerning, but a discrepancy there explains why the graph isnt as expected.
The mention of 5k, where did that come from? Are you saying that he thinks that the car didn't exceed 5k on that run? That's unlikely. A run would normally only end if.....
1. The Rev Limit is reached
2. The car stops making power
4. The operator aborts the run (if he hears Det or if the car is unstable on the rollers etc)
3. It self-destructs
However, the lines crossing depends TOTALLY on the configuration of the Graph. They will only cross if the Axis' are equal.
Post the graph so we can make some sense of it.
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27-11-2005, 01:48 PM
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Re: Dodgy rolling road toady...
Originally Posted by timrud
I'll name and shame them in a bit!
Their name is on the top of the printout !
27-11-2005, 02:43 PM
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Thats the whole point! It should easily be on par with mine, if not be more!
We worked out from the speed the max power was at he deffo didn;t rev it over 5k in 5th. About 4900 I think. Why would his machine be saying 8800rpm?
We worked out from the speed the max power was at he deffo didn;t rev it over 5k in 5th. About 4900 I think. Why would his machine be saying 8800rpm?
27-11-2005, 04:42 PM
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focus rs 1672
Originally Posted by Damo V
I was expecting this to be a thread about that bloke in neighbours
just noticed that mate..pmsl
27-11-2005, 06:18 PM
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Originally Posted by JamboRST
Originally Posted by Damo V
I was expecting this to be a thread about that bloke in neighbours
just noticed that mate..pmsl
rofl
27-11-2005, 06:48 PM
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Originally Posted by Christian and Beccy
LOL.
4th is the ideal gear, but 5th isn't too sad. Its just down to knowing how to read the graph.
The only legit reason to run it in 5th is for traction (i.e. if there was a lack of it in 4th).
4th is the ideal gear, but 5th isn't too sad. Its just down to knowing how to read the graph.
The only legit reason to run it in 5th is for traction (i.e. if there was a lack of it in 4th).
27-11-2005, 07:27 PM
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Originally Posted by St3V3_C
Originally Posted by Christian and Beccy
LOL.
4th is the ideal gear, but 5th isn't too sad. Its just down to knowing how to read the graph.
The only legit reason to run it in 5th is for traction (i.e. if there was a lack of it in 4th).
4th is the ideal gear, but 5th isn't too sad. Its just down to knowing how to read the graph.
The only legit reason to run it in 5th is for traction (i.e. if there was a lack of it in 4th).
27-11-2005, 07:54 PM
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Originally Posted by Damo V
Originally Posted by St3V3_C
Originally Posted by Christian and Beccy
LOL.
4th is the ideal gear, but 5th isn't too sad. Its just down to knowing how to read the graph.
The only legit reason to run it in 5th is for traction (i.e. if there was a lack of it in 4th).
4th is the ideal gear, but 5th isn't too sad. Its just down to knowing how to read the graph.
The only legit reason to run it in 5th is for traction (i.e. if there was a lack of it in 4th).
What got me looking at it was an RST got ran up the same day as me - him in 4th, got something like 200 ATW say. Ran mine up in 5th, and I had around the same at 210ish (
) On the way home though, I'm pissing all over his lighter car on the motorway - go figure.
28-11-2005, 12:09 AM
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Looks like they mixed up the RPM set point - nothing too major but should have sorted it. The oil temp just looks like ambient so not connected. Your a hard crowd today LOL
.
28-11-2005, 05:22 PM
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hello there, the above graph is of my turbo corsa, i asked timrud to post it for me see if anyone could make any sense out of it.
the car was tested in 5th gear and i was informed that they always test them in the gear below the top gear.
now, me and tim worked out that the 257 was made at a little under 4900rpm. on the graph, in my eyes, the power was still building and the boost was still tailing off evenly like its supposed to.
the reason why i have doubts is another corsa turbo there at the same day made 265bhp and 340+ nm of tourque. that car was peaked at 0.8bar of boost, whereas from the above graph mine peaked at 1.3.
the rolling road opperator said my loss of tourque was due to the fact that the engine runs low compression pistons. the pistons are je 87mil instead of the std 86mil. as far as im aware they only lower the compression from 9:1 to 8.5:1 which isnt reall a great lot.
also told me id loose tourque due to the drag of the 6 speed box. the other corsa ran an f20 5 speed which has the same ratio's as the f28 6speed, so i can understand why mine wasnt tested the same in 4th????
when i was sat in the car on the run for the graph above, the clocks in he car didnt show 5000rpm, whereas the other corsa went to over 6700rpm.
maybe i shouldnt worry too much and look at it that my car makes 257bhp below 5000rpm and probably would have made a lot more as it started to spin out the rollers when they had another few goes. the rpm figure on the graph above is wrong. totally wrong. i think he gave up on the run as the red light on the cumputer started flashing like mad as it was reading nearly 9000rpm.
sorry for the long, long, first ever post ive made.
the car was tested in 5th gear and i was informed that they always test them in the gear below the top gear.
now, me and tim worked out that the 257 was made at a little under 4900rpm. on the graph, in my eyes, the power was still building and the boost was still tailing off evenly like its supposed to.
the reason why i have doubts is another corsa turbo there at the same day made 265bhp and 340+ nm of tourque. that car was peaked at 0.8bar of boost, whereas from the above graph mine peaked at 1.3.
the rolling road opperator said my loss of tourque was due to the fact that the engine runs low compression pistons. the pistons are je 87mil instead of the std 86mil. as far as im aware they only lower the compression from 9:1 to 8.5:1 which isnt reall a great lot.
also told me id loose tourque due to the drag of the 6 speed box. the other corsa ran an f20 5 speed which has the same ratio's as the f28 6speed, so i can understand why mine wasnt tested the same in 4th????
when i was sat in the car on the run for the graph above, the clocks in he car didnt show 5000rpm, whereas the other corsa went to over 6700rpm.
maybe i shouldnt worry too much and look at it that my car makes 257bhp below 5000rpm and probably would have made a lot more as it started to spin out the rollers when they had another few goes. the rpm figure on the graph above is wrong. totally wrong. i think he gave up on the run as the red light on the cumputer started flashing like mad as it was reading nearly 9000rpm.
sorry for the long, long, first ever post ive made.
28-11-2005, 06:23 PM
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another CS member
Dont have an answer for you muppet, but how long and professional does your first post look, if only the same could be said about your input on CS
Dont have an answer for you muppet, but how long and professional does your first post look, if only the same could be said about your input on CS
28-11-2005, 06:31 PM
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yes jr, i am actually quite sensible, i just have a bit of a laugh on that site as there pretty much isnt any technical type people who would be able to give me a good answer to anything. so i search for answers elswhere.
28-11-2005, 06:35 PM
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Some funny reasons for stuff there - but still looks like they fluffed a run - tried again, wheelspin wheelspin wheelspin, excuse excuse excuse. Nothing too crazy - see it all the time LOL
Do you know a black corsa turbo from glasgow - all kitted up quad front lights etc. See it all time - just wondered if it was any good?
Cheers
Martin
Do you know a black corsa turbo from glasgow - all kitted up quad front lights etc. See it all time - just wondered if it was any good?
Cheers
Martin
28-11-2005, 06:48 PM
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Originally Posted by muppetsport
yes jr, i am actually quite sensible, i just have a bit of a laugh on that site as there pretty much isnt any technical type people who would be able to give me a good answer to anything. so i search for answers elswhere.