[supertech335]

Originally Posted by Terry335

The R switch alters the IAT signal, and the JB2 responds to the resulting map changes with a little more fuel.

thanks for answering that, i was pretty sure pin 9 was for the IAT, but wasn't sure what pin 17 was for. also when the R switch is on, the afr is still at 12.5 correct?

[Terry335]

Originally Posted by supertech335

thanks for answering that, i was pretty sure pin 9 was for the IAT, but wasn't sure what pin 17 was for. also when the R switch is on, the afr is still at 12.5 correct?

It goes a bit richer. Normal JB2 is around 12.0 if you read it with no cats, and with the R around 11.8:1. Pin 17 is top secret.

[supertech335]

Originally Posted by Terry335

It goes a bit richer. Normal JB2 is around 12.0 if you read it with no cats, and with the R around 11.8:1. Pin 17 is top secret.

i can respect that, lol
like i said earlier i read alot of funny stuff when doing a search, lol
thanks for the info

[jahwerx]

Check out what the computer is thinking about the intake temp (yes, that is snow on the ground) BTW, doing pulls is so d*mn hard when the wheels spin in anything less than 4th gear

[Terry335]

lol the snow is pretty hot out there.

[jahwerx]

or VERY VERY inefficient IC! LOL
DP's on tomorrow - should putting down the same #'s in your sig!

[itsbrokeagain]

Originally Posted by Terry335

I think people understand the mild boost curve, and the smarter ones notice the air/fuel curves, but what most people miss is the concept of how the 335i adaptive timing system works. It's impossible to control timing on the 335i with piggybacks, all you can do is offset some advance from the crank position sensor to give the adaptive system more space before throwing a limp code.

I think same thing goes for the I-VTEC system in the newer hondas. Just installing an S-AFC wont increase the power. I mean it will but you drive it long enough in traffic or cruise around with it, it overrides all the parameters and reverts back to stock..you literally have to drive it to redline all the time to keep the gain...either that or replace the computer with a Hondata....these newer cars are very hard to really piggyback without a lot of indepth knowledge, or the access to the ECU as Dinan did..

[Terry335]

Originally Posted by jahwerx

or VERY VERY inefficient IC! LOL
DP's on tomorrow - should putting down the same #'s in your sig!

Can't wait! Throw in some 100 and find a good dynojet near you. Do you have an air filter yet?

[itsbrokeagain]

Originally Posted by DrDomer

Any chance that the wastegates are maxed out near 15-16PSI? Would this make any sense? Meaning they are open at 0psi and 0voltage right? So they are closed at max voltage right? So near max voltage and during high boost it is difficult to finely control boost and sometimes the wastegates don't open as they should? Again... I'm a 3rd grader in a calculus class so I really have no idea how things work. Just trying to stimulate conversation.

To be straight to the point, the wastegates are not the limiting factor..its the damned stupid size of the turbos. I really should have taken a closeup of the exhaust side when I was doing a set of downpipes in someones car....I swear the wastegate flapper is actually BIGGER than the turbine itself..which has to be maybe..an inch and a half across at most? Its so damned tiny no wonder BMW keeps the wastegates open at part throttle..if they didnt this car would be making boost while idling...

The angle of the blades is pretty bad themselves..good spool at the cost of high rpm flow..the top of one blade almost covers the bottom of the next if you look right down on top of it. I remember somewhere someone clipped the turbine blades on these things to give it some more breathing room...a similar technique we used back in the day on old Eclipse Turbos and such...used to port and clip 16G units to further control boost in addition to hogging out the wastegate, or even dumping it right to atmosphere (which I think would almost be pointless on the 335 showing how the BMW leaves the gates open during crusing speeds to keep EGTs down and keep the drivability nice and smooth...it would be wayy to loud...even now while light throttle crusing I can hear my exhaust suddenly get louder (I already have the actuator on the back disconnected), then get quieter for a moment as I stomp on it (wastegates closing to build boost then opening again)

I would assume that putting larger turbos with even better internal gates would actually allow a good, constant, progressive boost map instead of a lot of spikes when trying to increase boost as some people have seen. All of you people bent on trying to push 15psi or more through these (even 14lbs I would call on the limits...a T25 which is BIGGER than our turbos, craps out around 15psi new, and about 13 on a used unit..it just cant take the abuse), I can see the turbos definetly taking a dump or getting some significant shaft play somewhere down the line...maybe metal shavings will be part of the fun!

As for me..what do I care? My car is leased

[Insider]

Yeah but since there are two turbos, each turbo is only making 7.5PSI. Correct? For a total of 15psi.

[Terry335]

Originally Posted by Insider

Yeah but since there are two turbos, each turbo is only making 7.5PSI. Correct? For a total of 15psi.

Hehe not exactly, but they each move 1/2 the required mass flow. Both operate at whatever the intake pressure is.

But I agree, these small turbos are an issue...

[Terry335]

Originally Posted by jahwerx

or VERY VERY inefficient IC! LOL
DP's on tomorrow - should putting down the same #'s in your sig!

If anyone ever asks just say a plastic bag got stuck in front of the intercooler.

[XxLancaxX]

Ive been following this thread. Terry, you sound like you have an outstanding product and I will most definitely be placing an order for JB2 and the "R". I just have been waiting for the delivery of my car which would be hopefully tom. Ill put a few hundred miles on it then to bmwjuice.com lol. Im in Chicago so gas is 93 octane and race gas I have literally in my garage. haha. If you ever come out to Chicago for anything you can drive my S63 AMG....Just bought it 2 months ago. Also have that blown C6. Congrats on the great products you have, your hard work and determination will pay off, we all known BMW's are not the easiest cars to work with....

[jahwerx]

Originally Posted by Terry335

Can't wait! Throw in some 100 and find a good dynojet near you. Do you have an air filter yet?

My car and garage are full of 100 see pic below - now THAT is convenient

Air filter is OEM.

Unfortunately, I don't know of a dyno nearby . . . there used to be one 10 minutes away, but those folks closed shop. I'll hunt one down at some point!