The Cobb Access Port thread - Page 7 - GT-R Register - Official Nissan Skyline and GTR Owners Club forum

Rich-GT · 29th July 2009, 12:33 PM

Have done several static noise tests, car revs fine to whatever you want in P or N.

Rich

Chubby · 29th July 2009, 12:38 PM

Not sure what mine was doing then, unless it was because engine wasnot up to full operating temp.

Will try when i get it back.

R.

charles charlie · 29th July 2009, 01:14 PM

Yep mine revved to over 6k when cold.

Just had to rev it for a mate last weekend!

David.Yu · 29th July 2009, 01:15 PM

I'm off to the GTROC track day at Combe this Saturday, so should find out!

Chubby · 29th July 2009, 01:25 PM

How strange, Not sure what was going on...

Perhaps mine is just being bloody 'awkward' - but as I said will try again when it comes back.

R.

David - watch out at Combe, not a great deal of run off areas if it goes tits up - and I hear the green stuff doesn't slow you down much..

David.Yu · 29th July 2009, 01:30 PM

Yeah I am very familiar with Combe and its hazards. I did my very first track experience there back in 1988!

Raced there in Caterhams too, although I think the GT-R will be a bit more interesting under braking for Quarry...

Chubby · 29th July 2009, 01:39 PM

Quote:

Originally Posted by David.Yu

although I think the GT-R will be a bit more interesting under braking for Quarry...

I should Coco...

Let us know how you get on..

bhp · 29th July 2009, 07:19 PM

Quote:

Originally Posted by David.Yu

Ooh, much difference with the 99RON map? Surely you should just go for a custom one?

So how many differant maps are there? i thought it was just a standard stage 0, 1 & 2 and then a custom map

Benji Linney GTC · 29th July 2009, 10:02 PM

Quote:

Originally Posted by bhp

So how many differant maps are there? i thought it was just a standard stage 0, 1 & 2 and then a custom map

different maps for different fuel grades

92ttz · 31st July 2009, 01:29 PM

Here are my results from dynoing with different Cobb maps. My car is a US model that I imported into Norway September last year. Modifications are K&N insert filters, HKS resonated midpipe and Mine's Ti Catback exhaust and offcourse the Cobb AP. I dynoed in US before shipping in and on a Dynojet it made 410 stock, 420 with Mine's and 461 with Mine's and Cobb stage 1 (1.04 version with boostspikes).

Went dynoing again in June this year after installing midpipe and got a Custom map from Sharif. Dynoed at a shop that has Dynapack dyno (the one that you bolt on as wheels) and did 2 runs with stock Cobb map, 2 runs with Stage 2 map and 1 run with custom map before we got clutch overheat problems. The runs where done in 5th gear as that is 1,00 ratio and that was what the tuner wanted and also VDC off. The graphs say flywheel torque/power, but it is wheel torque/power.

Here are a graph showing the stock/st 2/custom NM/HP

and showing the boost on the different maps

Stock map. As you can see it is well down on my earlier dyno that was 410 and now it is 409 with y-pipe and catback that adds around 22 whp. Might have somthing todo with it being dynoed in 5th gear.

Stage 2 map

Custom map. Look how much smoother this graph is.

Compare stock vs Custom gives you close to 60 whp and a lot more torque

Compare Stage 2 vs Custom gives you close to 30 whp and also much more torque

Chubby · 31st July 2009, 06:54 PM

Coming back to the reving when static.

Got my car back to day and it would rev over 5000rpm, what ever you do...

Which now I am sure is an improvement on the last time I tried it as it wouldn't go above 4000 rpm...

Need some assistance here to understand why.??

R.

David.Yu · 1st August 2009, 09:34 PM

Quote:

Originally Posted by Chubby

Coming back to the reving when static.

Got my car back to day and it would rev over 5000rpm, what ever you do...

Which now I am sure is an improvement on the last time I tried it as it wouldn't go above 4000 rpm...

Need some assistance here to understand why.??

R.

Tried mine today and you're right, it doesn't go above 5k in P or N.
But then again, I can't think of any circumstances where you would want it to!
Noise tests are all done at 4,500rpm max, which it does fine.

Combe was brilliant fun by the way, will post up a thread tomorrow.

Rich-GT · 2nd August 2009, 07:16 AM

Was noise tested at Goodwoood yesterday and the wanted 3/4 max revs, so 5250 ish, and yes you are right it only goes to 5000.

Rich

Chubby · 2nd August 2009, 07:51 AM

Quote:

Originally Posted by David.Yu

Tried mine today and you're right, it doesn't go above 5k in P or N.
But then again, I can't think of any circumstances where you would want it to!

Thanks - though mine was wrong..

And yes i totally agree why!!

R.

David.Yu · 2nd August 2009, 10:51 AM

Quote:

Originally Posted by Rich-GT

Was noise tested at Goodwoood yesterday and the wanted 3/4 max revs, so 5250 ish, and yes you are right it only goes to 5000.

Rich

Only you would be so precise! I'm sure 5k was fine?

What did it measure?

29th July 2009, 12:33 PM	#91 (permalink)
Rich-GT Rich-GT is faster round the track on the Dunlop Tyres New Users Join Date: Apr 2008 Location: Oxon / Northants Posts: 284	Have done several static noise tests, car revs fine to whatever you want in P or N. Rich __________________

29th July 2009, 12:38 PM	#92 (permalink)
Chubby Chubby has no status. GTR Register Member Join Date: Mar 2008 Posts: 315	Not sure what mine was doing then, unless it was because engine wasnot up to full operating temp. Will try when i get it back. R. __________________

29th July 2009, 01:14 PM	#93 (permalink)
charles charlie charles charlie is running EBC yellowstuff until his rotors give out! New Users Join Date: May 2008 Location: North West Cars owned: E36 M3 Evo, Mini Cooper S, 996 Boxster S, Caterham Super 7, Merc Tractor :( Posts: 2,153	Yep mine revved to over 6k when cold. Just had to rev it for a mate last weekend! __________________

29th July 2009, 01:15 PM	#94 (permalink)
David.Yu David.Yu is loving having a Purple GT-R again New Users Join Date: Jun 2001 Location: Lightwater, Surrey Cars owned: Corvette C6 Z06, R35 GT-R Posts: 1,651	I'm off to the GTROC track day at Combe this Saturday, so should find out! __________________

29th July 2009, 01:25 PM	#95 (permalink)
Chubby Chubby has no status. GTR Register Member Join Date: Mar 2008 Posts: 315	How strange, Not sure what was going on... Perhaps mine is just being bloody 'awkward' - but as I said will try again when it comes back. R. David - watch out at Combe, not a great deal of run off areas if it goes tits up - and I hear the green stuff doesn't slow you down much.. __________________

29th July 2009, 01:30 PM	#96 (permalink)
David.Yu David.Yu is loving having a Purple GT-R again New Users Join Date: Jun 2001 Location: Lightwater, Surrey Cars owned: Corvette C6 Z06, R35 GT-R Posts: 1,651	Yeah I am very familiar with Combe and its hazards. I did my very first track experience there back in 1988! Raced there in Caterhams too, although I think the GT-R will be a bit more interesting under braking for Quarry... __________________

31st July 2009, 01:29 PM	#100 (permalink)
92ttz 92ttz has no status. GTR Register Member Join Date: Aug 2008 Location: Norway Posts: 5	Here are my results from dynoing with different Cobb maps. My car is a US model that I imported into Norway September last year. Modifications are K&N insert filters, HKS resonated midpipe and Mine's Ti Catback exhaust and offcourse the Cobb AP. I dynoed in US before shipping in and on a Dynojet it made 410 stock, 420 with Mine's and 461 with Mine's and Cobb stage 1 (1.04 version with boostspikes). Went dynoing again in June this year after installing midpipe and got a Custom map from Sharif. Dynoed at a shop that has Dynapack dyno (the one that you bolt on as wheels) and did 2 runs with stock Cobb map, 2 runs with Stage 2 map and 1 run with custom map before we got clutch overheat problems. The runs where done in 5th gear as that is 1,00 ratio and that was what the tuner wanted and also VDC off. The graphs say flywheel torque/power, but it is wheel torque/power. Here are a graph showing the stock/st 2/custom NM/HP and showing the boost on the different maps Stock map. As you can see it is well down on my earlier dyno that was 410 and now it is 409 with y-pipe and catback that adds around 22 whp. Might have somthing todo with it being dynoed in 5th gear. Stage 2 map Custom map. Look how much smoother this graph is. Compare stock vs Custom gives you close to 60 whp and a lot more torque Compare Stage 2 vs Custom gives you close to 30 whp and also much more torque __________________

31st July 2009, 06:54 PM	#101 (permalink)
Chubby Chubby has no status. GTR Register Member Join Date: Mar 2008 Posts: 315	Coming back to the reving when static. Got my car back to day and it would rev over 5000rpm, what ever you do... Which now I am sure is an improvement on the last time I tried it as it wouldn't go above 4000 rpm... Need some assistance here to understand why.?? R. __________________

2nd August 2009, 07:16 AM	#103 (permalink)
Rich-GT Rich-GT is faster round the track on the Dunlop Tyres New Users Join Date: Apr 2008 Location: Oxon / Northants Posts: 284	Was noise tested at Goodwoood yesterday and the wanted 3/4 max revs, so 5250 ish, and yes you are right it only goes to 5000. Rich __________________

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