Rennteam 2.0 - EN - Forum - Re: CGT 100-300 km/h .. as i promised - Page2

Oct 11, 2007 3:28:14 PM

CGT1178: Co-Pilot; Loc: kuwait; Posts: 216, Gallery; Registered on: Oct 26, 2006; Reply to: TB993tt

Re: CGT 100-300 km/h .. as i promised

the next time i will do that and i advice you to do it:
1- 1 passenger
2- 1/4 tank
3- cold weather (under 15*c)
4- smooth road
5- not againest the wind
6- hard use in the same test day ( hight speed
7- very fast shifting <------------------------------------
8- shifing on 8,350 rpm <----------------------------------
9- low humidity
10-all that just for fun

11-sorry for my bad english

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Oct 11, 2007 4:11:48 PM

baron: Junior; Loc:; Posts: 74, Gallery; Registered on: Jul 3, 2003; Reply to: CGT1178

Re: CGT 100-300 km/h .. as i promised

Nice results. I think you also need to do several runs in both directions and average the results. Also was the elevation significant?

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Oct 11, 2007 8:14:03 PM

iia: Pilot; Loc: Canada; Posts: 342, Gallery; Registered on: Aug 24, 2004; Reply to: TB993tt

Re: CGT 100-300 km/h .. as i promised

Quote:
TB993tt said:
Quote:
iia said:
Quote:
hugo said:
yes,but we are talking about 0-300,not 0-100 as per the a/m

You can just add 0-100 of ~4 sec into 100-300 run to get the result of 0-300.

Please tell me he realises that -what sort of posters are we getting on here

Someone might oversight. Someone think he is a better poster.

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Oct 11, 2007 8:23:12 PM

ha: Expert; Loc: Riyadh , Saudi Arabia; Posts: 1695, Gallery; Registered on: Nov 20, 2003; Reply to: iia

Re: CGT 100-300 km/h .. as i promised

What fuel octan are you using CGT?

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Oct 11, 2007 8:57:23 PM

CGT1178: Co-Pilot; Loc: kuwait; Posts: 216, Gallery; Registered on: Oct 26, 2006; Reply to: ha

Re: CGT 100-300 km/h .. as i promised

Quote:
ha said:
What fuel octan are you using CGT?

98

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Oct 12, 2007 8:51:32 AM

hugo: Pilot; Loc: Ro , Romania; Posts: 369, Gallery; Registered on: Jul 4, 2007; Reply to: iia

Re: CGT 100-300 km/h .. as i promised

Quote:
iia said:
Quote:
TB993tt said:
Quote:
iia said:
Quote:
hugo said:
yes,but we are talking about 0-300,not 0-100 as per the a/m

You can just add 0-100 of ~4 sec into 100-300 run to get the result of 0-300.

Please tell me he realises that -what sort of posters are we getting on here

Someone might oversight. Someone think he is a better poster.

firstly,sorry but due to the way you express youself in English it is difficult to understand what you are trying to say,but that might just be an oversight on my part...

secondly,if you do a "proper" 0-300(meaning, not 100-300 @ whatever seconds + 4 sec)you are most likely to find the cgt does not better 32 sec

as to the real importance of all this,i agree not much and there are other more relevant parameters to evaluate performance

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Oct 12, 2007 8:59:02 AM

Crash: Rennteam VIP; Loc: Never been to , Antarctica; Posts: 8287, Gallery; Registered on: Oct 17, 2002; Reply to: hugo

Re: CGT 100-300 km/h .. as i promised

Quote:
hugo said:
Quote:
iia said:
Quote:
TB993tt said:
Quote:
iia said:
Quote:
hugo said:
yes,but we are talking about 0-300,not 0-100 as per the a/m

You can just add 0-100 of ~4 sec into 100-300 run to get the result of 0-300.

Please tell me he realises that -what sort of posters are we getting on here

Someone might oversight. Someone think he is a better poster.

firstly,sorry but due to the way you express youself in English it is difficult to understand what you are trying to say,but that might just be an oversight on my part...
secondly,if you do a "proper" 0-300(meaning, not 100-300 @ whatever seconds + 4 sec)you are most likely to find the cgt does not better 32 sec

as to the real importance of all this,i agree not much and there are other more relevant parameters to evaluate performance

Why wouldn't it better 32 seconds? Are you saying that it needs 8 seconds to reach 100 km/h? His time is accurate.

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Oct 12, 2007 9:45:27 AM

TB993tt: Rennteam Pro; Loc: manchester , United Kingdom; Posts: 2280, Gallery; Registered on: Jul 22, 2002; Reply to: hugo

Re: CGT 100-300 km/h .. as i promised

Quote:
hugo said:
,if you do a "proper" 0-300(meaning, not 100-300 @ whatever seconds + 4 sec)you are most likely to find the cgt does not better 32 sec

So you DID mean what you said before ?

Can you explain why you believe a 0-300kph will be more accurate than a 100-300kph (starting in 2nd gear) and adding ~4s

Not only has CGT1178 shown us the Driftbox proof with slope data but he has taken the trouble to video it

If you time the video you will see that the numbers look about right (allowing for speedo error)
So unless one wants to get into various conspiracy theories CGT1178 has proven his numbers

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Oct 12, 2007 9:46:09 AM

Crash: Rennteam VIP; Loc: Never been to , Antarctica; Posts: 8287, Gallery; Registered on: Oct 17, 2002; Reply to: TB993tt

Re: CGT 100-300 km/h .. as i promised

Quote:
TB993tt said:
Quote:
hugo said:
,if you do a "proper" 0-300(meaning, not 100-300 @ whatever seconds + 4 sec)you are most likely to find the cgt does not better 32 sec

So you DID mean what you said before ?

Can you explain why you believe a 0-300kph will be more accurate than a 100-300kph (starting in 2nd gear) and adding ~4s

Not only has CGT1178 shown us the Driftbox proof with slope data but he has taken the trouble to video it If you time the video you will see that the numbers look about right (allowing for speedo error)
So unless one wants to get into various conspiracy theories CGT1178 has proven his numbers

×2

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Oct 12, 2007 12:09:08 PM

CGT1178: Co-Pilot; Loc: kuwait; Posts: 216, Gallery; Registered on: Oct 26, 2006; Reply to: Crash

Re: CGT 100-300 km/h .. as i promised

TB993tt and Crash thank you

..

when i will change my tyries i will try my cgt from 0 to 300(it`s not promise) .. my tyries now is bad

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Oct 12, 2007 12:14:03 PM

CGT1178: Co-Pilot; Loc: kuwait; Posts: 216, Gallery; Registered on: Oct 26, 2006; Reply to: hugo

Re: CGT 100-300 km/h .. as i promised

when i try any car from zero the number from 100-200 will be better than when i try it from 2nd gear .
i tryed that with my 997TT

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Oct 12, 2007 1:27:06 PM

MKSGR: Rennteam Moderator; Loc: Germany , Germany; Posts: 8098, Gallery; Registered on: Jun 17, 2002; Reply to: TB993tt

Re: CGT 100-300 km/h .. as i promised

Quote:
TB993tt said:
Not only has CGT1178 shown us the Driftbox proof with slope data but he has taken the trouble to video it If you time the video you will see that the numbers look about right (allowing for speedo error)
So unless one wants to get into various conspiracy theories CGT1178 has proven his numbers

Agreed, the video is particularly useful. Also, the data provided seems pretty reliable

Seems that some CGT can do 0-300 below 30s.

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Oct 12, 2007 1:37:15 PM

iia: Pilot; Loc: Canada; Posts: 342, Gallery; Registered on: Aug 24, 2004; Reply to: hugo

Re: CGT 100-300 km/h .. as i promised

Quote:
hugo said:
Quote:
iia said:
Quote:
TB993tt said:
Quote:
iia said:
Quote:
hugo said:
yes,but we are talking about 0-300,not 0-100 as per the a/m

You can just add 0-100 of ~4 sec into 100-300 run to get the result of 0-300.

Please tell me he realises that -what sort of posters are we getting on here

Someone might oversight. Someone think he is a better poster.

firstly,sorry but due to the way you express youself in English it is difficult to understand what you are trying to say,but that might just be an oversight on my part...

Sorry, my english is bad. I just think you might be oversight.

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Oct 12, 2007 4:09:58 PM

ha: Expert; Loc: Riyadh , Saudi Arabia; Posts: 1695, Gallery; Registered on: Nov 20, 2003; Reply to: iia

Re: CGT 100-300 km/h .. as i promised

Hey CGT, have you seen this... www.fvd.us

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Oct 12, 2007 4:30:38 PM

CGT1178: Co-Pilot; Loc: kuwait; Posts: 216, Gallery; Registered on: Oct 26, 2006; Reply to: ha

Re: CGT 100-300 km/h .. as i promised

yes i saw it before but i dont like to touch my car ..

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Oct 12, 2007 4:45:31 PM

ha: Expert; Loc: Riyadh , Saudi Arabia; Posts: 1695, Gallery; Registered on: Nov 20, 2003; Reply to: CGT1178

Re: CGT 100-300 km/h .. as i promised

Quote:
CGT1178 said:
yes i saw it before but i dont like to touch my car ..

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Oct 12, 2007 7:04:00 PM

TB993tt: Rennteam Pro; Loc: manchester , United Kingdom; Posts: 2280, Gallery; Registered on: Jul 22, 2002; Reply to: ha

Re: CGT 100-300 km/h .. as i promised

CGT is one car which feels like it doesn't need more power, it can activate the TC all the way through second gear in the dry !

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Oct 15, 2007 8:51:43 AM

GT2ETR: Junior; Loc:; Posts: 56, Gallery; Registered on: Jul 2, 2006; Reply to: TB993tt

Re: CGT 100-300 km/h .. as i promised

TB993TT, I cannot see very well the graphs, but is your 200-300kph run about 5 seconds slower than this one?

Despite that your runs I assume are made at much lower temperatures than in Kuwait as well, and they were two drivers on board, so one of the two cars is out of the 5% tolerance spec. There is a good 200+ HP there difference from 200-300kph in that case (ca. 5seconds). I don't have the answer, but in view of such delta, one needs to look further I think.

As far as rolling resistence, it is not very important, and it is linear vs. speed, unlike aerodynamic drag, so what you see above 200kph is the same as below 200kph, keeping aside all other factors such as tire expansion, heat, etc which should not be too far off between both cars.

Without getting too deep into physics, you can quite accurately calculate the impact of rolling resistence as follows:

Power to overcome rolling resistance = Weight (lbs.) x RR coefficient x mph / 375

The coefficient of drag for VERY smooth asphalt is 10 and for very rough asphalt is 22, data is widely available.
Poor asphalt: Power (BHP)= 3200 x 0.022 x 186mph/375= 34.94 Bhp
Good asphalt: Power= 3200 x 0.010 x 186/376 - 15.8 Bhp

This is to the wheels. Allow for 15% more to the flywheel due to parasitic losses and friction. As you can see the difference is not very important. This really has me confused.

All of the above, provided I am reading the right numbers of course!

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Oct 15, 2007 9:51:43 AM

TB993tt: Rennteam Pro; Loc: manchester , United Kingdom; Posts: 2280, Gallery; Registered on: Jul 22, 2002; Reply to: GT2ETR

Re: CGT 100-300 km/h .. as i promised

The 200-300 difference is about 3.7s and the 100-200 difference is about 1.2s -total 100-300 is ~5s

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Oct 15, 2007 9:32:52 PM

GT2ETR: Junior; Loc:; Posts: 56, Gallery; Registered on: Jul 2, 2006; Reply to: TB993tt

Re: CGT 100-300 km/h .. as i promised

Quote:
TB993tt said:
The 200-300 difference is about 3.7s and the 100-200 difference is about 1.2s -total 100-300 is ~5s

Not as much as I thought then, but you are still outrun substantially by a heavier CGT running in hotter temperatures, and these are naturally aspirated engines..

The loss does not seem to be in shifting, since you both shift almost exactly as fast. A better scale (-0.2G to 0.8G) on the acceleration line might have shown how big is the spread in longitudinal Gs between both cars and help clarify.

What I am trying to get to is that in my opinion this is not a rolling resistence, or shifting problem. (Your) slope also is not an important factor, the other run's slope is not seen here.

I am repeating myself, but I fail to see any other reason for this spread than one of the cars being out of spec, specially when the best time belongs to the car running in worse conditions.

Your car's runs seem to be consistent with magazine tests.

Interesting!

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Oct 16, 2007 2:06:50 AM

xandi911: Senior; Loc: brasil; Posts: 688, Gallery; Registered on: Feb 14, 2006; Reply to: GT2ETR

Re: CGT 100-300 km/h .. as i promised

wheres the VIDEO!?!? i wanna SEE!!!!

PLEASEEEE!!!

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Oct 16, 2007 3:44:24 AM

ha: Expert; Loc: Riyadh , Saudi Arabia; Posts: 1695, Gallery; Registered on: Nov 20, 2003; Reply to: TB993tt

Re: CGT 100-300 km/h .. as i promised

Quote:
TB993tt said:
CGT is one car which feels like it doesn't need more power, it can activate the TC all the way through second gear in the dry !

I agree with you 100% but to some people its never enough. I guess CGT, yourself & I are prety content.

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Oct 16, 2007 8:43:56 AM

TB993tt: Rennteam Pro; Loc: manchester , United Kingdom; Posts: 2280, Gallery; Registered on: Jul 22, 2002; Reply to: GT2ETR

Re: CGT 100-300 km/h .. as i promised

Quote:
GT2ETR said:
Quote:
TB993tt said:
The 200-300 difference is about 3.7s and the 100-200 difference is about 1.2s -total 100-300 is ~5s

Not as much as I thought then, but you are still outrun substantially by a heavier CGT running in hotter temperatures, and these are naturally aspirated engines..

The loss does not seem to be in shifting, since you both shift almost exactly as fast. A better scale (-0.2G to 0.8G) on the acceleration line might have shown how big is the spread in longitudinal Gs between both cars and help clarify.

What I am trying to get to is that in my opinion this is not a rolling resistence, or shifting problem. (Your) slope also is not an important factor, the other run's slope is not seen here.

I am repeating myself, but I fail to see any other reason for this spread than one of the cars being out of spec, specially when the best time belongs to the car running in worse conditions. Your car's runs seem to be consistent with magazine tests.

Interesting!

I can't disagree with any of what you say above. I am presuming that the "height" is the line shown below which looks pretty level:

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Oct 19, 2007 9:06:54 AM

BiTurbo: Rennteam Master; Loc: X , United States; Posts: 3252, Gallery; Registered on: Jan 27, 2006; Reply to: TB993tt

Re: CGT 100-300 km/h .. as i promised

Where's the Video ?

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Oct 23, 2007 4:38:53 AM

xandi911: Senior; Loc: brasil; Posts: 688, Gallery; Registered on: Feb 14, 2006; Reply to: BiTurbo

Re: CGT 100-300 km/h .. as i promised

Quote:
BiTurbo said:
Where's the Video ?

PLEASE THE VIDEOOOOO

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Re: CGT 100-300 km/h .. as i promised

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Re: CGT 100-300 km/h .. as i promised

Re: CGT 100-300 km/h .. as i promised

Re: CGT 100-300 km/h .. as i promised

Re: CGT 100-300 km/h .. as i promised

Re: CGT 100-300 km/h .. as i promised

Re: CGT 100-300 km/h .. as i promised

Re: CGT 100-300 km/h .. as i promised

Re: CGT 100-300 km/h .. as i promised

Re: CGT 100-300 km/h .. as i promised

Re: CGT 100-300 km/h .. as i promised

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