Cobb AccessPort for 370Z!

nopistons · 08-18-2009, 07:21 PM

I have an accessport for sale if anyone wants one.

Denny McLain · 08-19-2009, 08:00 AM

Quote:

Originally Posted by nopistons

I have an accessport for sale if anyone wants one.

I've been to Cobb in Plano TX three or four times. In the beginning they used my car to read the ECU to get data so they could develop the softare. Every time I visit, get the impression they are completely standup and unlike most companies, do not overhype gains.

Most people whom tune do not give out secrets but after you've got the knack of doing a couple, it's not as much rocket science as you would think. Calvin whom works the dyno and does the tuning, was very knowledgeable and competent. He was very straight forward saying he didn't know why the car didn't more power and asked that I take it back to the original dyno for comparison.

Think it's more of an issue of everything being so new, there are gremlins to find and bugs to work out. Evidently the computers are very complicated and my gut says it's a matter of time. If not, there might be a new Grand Sport or Z06 Corvette on my X-mas list.

semtex · 08-19-2009, 08:04 AM

Quote:

Originally Posted by Denny McLain

Evidently the computers are very complicated and my gut says it's a matter of time.

It just so happens that this is the reason UpRev gives for taking so long on development of their software for the 370. And VVEL adds an additional layer of complexity, apparently.

Denny McLain · 08-19-2009, 10:23 AM

Quote:

Originally Posted by semtex

It just so happens that this is the reason UpRev gives for taking so long on development of their software for the 370. And VVEL adds an additional layer of complexity, apparently.

There is a lot of conjecture that can be made here. If you look closely at the dyno sheet there are slight changes around 4500 rpm, 7100 rpm and 7700 rpm. When I saw those, the first thing I did was check the fuel/air and then ask Calvin if the car was pulling out timing at those points. He said the timing was good and his feeling was the car was changing cam timing at those points and a lot more could be had when the VVEL software is perfected. You would see a puff of smoke every time it hit the 7100-7200 mark, so something was going on.

Also..... while I'm making blind guesses, might as well make a few more. Notice the slight improvements in the 2000 to 4500 range where Calvin thought the first VVEL table was. It did for sure improve slightly in that range. Is it tuning software, or does the car learn one VVEL table at a time? Will it pick up on top later?

The rev limit was set from 7500 to 8000 rpm and as you can see, it takes a sharp drop just past 7500 rpm. Is that because it needs to learn from never being there? Or, did the engineers pull back on cam timing to keep people from over revving the engine??

Is the tac accurate? I now see it hit 8200 and doesn't hit the limiter. Or, is the new rev limit not accurate?

Inquiring minds want to know.

kannibul · 09-22-2009, 11:33 PM

Quote:

Originally Posted by Denny McLain

There is a lot of conjecture that can be made here. If you look closely at the dyno sheet there are slight changes around 4500 rpm, 7100 rpm and 7700 rpm. When I saw those, the first thing I did was check the fuel/air and then ask Calvin if the car was pulling out timing at those points. He said the timing was good and his feeling was the car was changing cam timing at those points and a lot more could be had when the VVEL software is perfected. You would see a puff of smoke every time it hit the 7100-7200 mark, so something was going on.

Also..... while I'm making blind guesses, might as well make a few more. Notice the slight improvements in the 2000 to 4500 range where Calvin thought the first VVEL table was. It did for sure improve slightly in that range. Is it tuning software, or does the car learn one VVEL table at a time? Will it pick up on top later?

The rev limit was set from 7500 to 8000 rpm and as you can see, it takes a sharp drop just past 7500 rpm. Is that because it needs to learn from never being there? Or, did the engineers pull back on cam timing to keep people from over revving the engine??

Is the tac accurate? I now see it hit 8200 and doesn't hit the limiter. Or, is the new rev limit not accurate?

Inquiring minds want to know.

Puff of smoke = knock sensor = degraded timing?

Denny McLain · 09-23-2009, 08:42 AM

Quote:

Originally Posted by kannibul

Puff of smoke = knock sensor = degraded timing?

Exactly. Calvin said he saw no hint of retard on his logging. However, when looking at my own posted scanning log; see a 2 degree hit in timing about the same time you would see a puff.

drisko · 09-24-2009, 01:31 PM

So, can the TechnoSquare software or any other tuning solution adjusting timing? I just want to know if this is even something possible for COBB to fix.

Damn, wish someone from COBB would chime in on this thread. We really need some answers on what is going on with the 370Z Accessport.

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08-18-2009, 07:21 PM	#1 (permalink)
nopistons Base Member Join Date: Aug 2009 Location: El Cajon, CA Posts: 11 Drives: Subaru Rep Power: 16	I have an accessport for sale if anyone wants one.

09-24-2009, 01:31 PM	#7 (permalink)
drisko Base Member Join Date: Jan 2009 Location: So Cal Age: 44 Posts: 160 Drives: 09 370Z PW Tour S 6M Rep Power: 17	So, can the TechnoSquare software or any other tuning solution adjusting timing? I just want to know if this is even something possible for COBB to fix. Damn, wish someone from COBB would chime in on this thread. We really need some answers on what is going on with the 370Z Accessport.