Consequences for running MAF-less and TCD?
08-31-2006, 09:30 AM
#1
AudiWorld Super User
Thread Starter
Join Date: Mar 2003
Posts: 5,860
Likes: 0
Received 0 Likes
on
0 Posts
Consequences for running MAF-less and TCD?
I tried this out on my car to help determine if my MAF housing was to large. I have to say with this GIAC software and my Tip trans it shifts a lot better. I can now do part throttle under boost at low speeds ~40mph .. Amazing! There are some abnormalities when driving however, for example if I am crusing and I crack the throttle just a tad to speed up the engine feels like its going to stall or its breaking up. It doesnt' do this when I get into boost however. And if I am in TIP mode in 4th gear under extremem boost and I upshift into 5th it BANGS big time so I avoid doing that now. I just wanted to check with you guys see what you think, since the car essentially has no MAP sensor since its clamped and now no MAF sensor since its unpluged I am wondering how its calculating load with the boost I am running. Just makes me a bit nervous. Input?
08-31-2006, 09:35 AM
#4
AudiWorld Super User
Thread Starter
Join Date: Mar 2003
Posts: 5,860
Likes: 0
Received 0 Likes
on
0 Posts
Well I am not running a maf at the moment .. Hmm wouldn't <more>
that be the other way around? Since the MAF reading is lower (90mm MAF) the load it sees would be lower? Now if the MAF were smaller running the same turbos/boost the MAF reading would be higher so I would get harder faster shifts? I am thinking about trying out an 88mm MAF. Can't find someone to let me borrow one that bolts to an R$4 airbox though :>
Trending Topics
email me your current addy and i'll pop it in the mail.
08-31-2006, 09:47 AM
#9
AudiWorld Super User
Join Date: Oct 2004
Posts: 3,421
Likes: 0
Received 0 Likes
on
0 Posts
You're partially there. It gets a lower signal relative to what is actually going on.
Bigger MAF=lower load signal realative to the amount of TQ you are actually putting in. Therefore you are tricking the trans into thinking it is getting a normal load.
08-31-2006, 09:50 AM
#10
AudiWorld Expert
Join Date: Dec 2000
Posts: 33,078
Likes: 0
Received 0 Likes
on
0 Posts
with the maf unplugged it uses rpm and throttle plate angle,
MAP is not consulted if its in "characteristic" load calc.
i.e. your car will run sick if the ECU thinks either the MAF or MAP is dead.
A MAP clamp will not (normally) cause the ECU to think the MAP is dead.
i.e. your car will run sick if the ECU thinks either the MAF or MAP is dead.
A MAP clamp will not (normally) cause the ECU to think the MAP is dead.