tdiddy

At least your cars will idle with the AP!

mysql

yeah, but even if your car can't run, you got the bling baby!

staticlag

my car idles just fine with the INTx.

mysql

12 afr idle isn't fine. It's merely adequate.

tdiddy

Yeah, but it ain't getting me laid sitting in the garage!

mysql

shieeeat! just push it out to the sidewalk, then lean up against it for a while.

tdiddy

You've never seen Colfax, IL. Just ask Ray what its like.

alnielsen

iTrader: (4)

Your married, you aren't supposed to get laid. And you almost live in suburban Colfax.

Kane

iTrader: (1)

Classic..... oh wait; I am married too...

tdiddy

Maybe my wife really likes to go fast.

I think we pushed the population over 800 when we had my son.

staticlag

I didn't buy the turbo to idle it.

joff

Boost pressure lies. One can either believe the MAF or the boost gauge. My money is on the MAF (assuming its properly mounted) as it corroborates more closely with all the various dyno results I've seen on this forum.

Here is some more data for you. It is also in CSV format so you can plot it however you want. It computes two pressures, the higher one is your real boost pressure-- another way to look at is the extra pressure the atmosphere would have to be at for an NA motor to ingest the same amount of mass your turbo does. I have even compensated for the actual VE of the renesis as measured by Hymee in https://www.rx8club.com/series-i-tech-garage-22/measured-mass-air-flow-efficiency-33370/ as well as your altitude, humidity and ambient temp.

The second, slightly lower number in the CSV is the pressure of the intake charge inside the 1.308L displacement volume of the engine after the intake port closes. It can be reasonably proven that you needed at least this much pressure outside the intake port. In reality you need more -- you have to overcome the natural VE of the motor and your density invariably has decreased due to inperfect intercooling. Less density == more pressure needed to ingest the air we already know flowed through the MAF.

Now that I've processed your logfile completely, I see you have a boost spike at 4500 RPM. It seems the VE of a stock motor is close to the least there (82%) so the turbo has to supply more pressure to make it eat. The NA renesis at WOT consumes 95g/s there and your logs show you eating 220g/s! That is 19.1psi! Even if we assume 100% VE I still see you peaking over 15psi in places.

I have also enclosed the AWK program I wrote to crunch your CSV file into a boost pressure CSV. Might be useful if anybody wants to double-check my math or plug in different numbers for the VE table or atmospheric air density. Its really a pretty simple script and you don't need to be a programmer to read it.

\\Konig\\

iTrader: (4)

great all the threads are being closed now.

where are people going to get the guidance needed for the cobb so they dont blow their engines

errr.

mysql

If it's a perm ban, we'll be going to a different forum.

The lounge threads can remain here.

zoom44

if Jeff chooses to be permanently banned from here by continuing to go around the ban currently in place im sure he will continue to offer great customer service.

\\Konig\\

iTrader: (4)

can you at least open up the cobb na discussion thread? i dont see why that thread was closed. just screwing all the NA cobb users by closing that thread sigh...

VarneyMazda

I personally think this is an idiot comment.

INT-X's do not make car's blow up.

and from the sounds of this thread my car with an INT-X needs far less tweaking than you AP owners.

mysql

Actually from my personal experience, there is no tweaking needed for the AP, at all. The only thing you need to do is make sure your intake is setup properly so the MAF can function as it was designed. If you have a filter inches away from the MAF, the sensor cannot properly gauge airflow. And the nice thing about this situation is the car runs rich in boost, so it's not dangerous - it's just not ideal.

The calibrations are done mathematically, based on the VE of the engine, the injector sizes, etc.

I don't mind the int-x, it's really great for getting max power, but it's sub par for idle and it does require proper tuning and an eye kept on ambient temperatures, otherwise the AFR can wander away from what you expect.

SlideWayz

Yeah, MIT gives idiots degrees in nuclear engineering all the time.

You don't understand the difference between dynamic and static tuning?

I'm not saying the Inx-X is 'bad', it's just obsolete. I have an Xede, which does everything the Int-X does PLUS sense/control boost. You know what? My Xede is obsolete too.

Turbocharging this car increases the odds of a blown engine. How might one best manage this risk? Answer: having the tune be very accurate and automatically adjust itself with changing conditions. That's why modern factory PCMs do this.

Being able to leverage this capability is a good thing.

It is better than tuing the car for one given set of temp/humidity/etc. then not adjusting the tune as conditions change. So, yes, any stand alone that can only do a static tune is more likely to make your engine blow than a method that adjusts the tune as needed to keep AFRs in a safer place.

This is just a simple, logical fact...nothing to get emotional about.

m4f1050

iTrader: (1)

Like mysql101 said, if you are planning on keeping the Int-X just have 2 diff. maps, one for cold, one for warm/hot, and do make sure they are tuned by a professional.

SlideWayz has a point: Dynamic = AP and Static = Int-X ... So if you are not changing too much in temps, baro, and other factors then Int-X needs only 1 map, otherwise you need to tune to these specs statically. The AP does it itself but you need to initially set it up right.

slavearm

WTF guys... why don't all parties involved get together and do a group hug or something. We are all Men here right? Can we stop the f-ing quibbling bs and get back to making the 8 better? Or did things change and nobody really f-ing care after the site was sold?

mysql

quick post in before the thread is closed!

Jedi54

iTrader: (7)

Jedi translation: Jeff is currently not perma banned BUT if he continues trying to log in, the perma ban is ready and will be of his own doing.

C'mon Jeff, if you can read this just take it easy and think of the Greater good served by you just taking the week off. We need you man, don't let his be the end of all the great work you've done on here.
I really don't want to have to move to the Dark Side permanantely.

slavearm

Talking about MM (you) and the management of the site. Email me about Saturday.

Thanks,

Shane

\\Konig\\

iTrader: (4)

i guess ill be moving here for questions reguarding NA rx8s with the cobb?

wth does the NA cobb discussion have to do with anything, WHY was it closed. i can make another thread about it right? or will it be closed too?