NefMoto

Here comes the noob! So last night I dropped in a big turbo precision 5878 tubro with 550cc ev14 injectors and an a 4.2l s4 maf with maf housing 4in. Car starts then dies, so I unplugged maf and it runs. Well runs super rich .80 all day, and my fuel trims won't do any adapting as maf is unplugged? I thought I copied the s4 map correctly and I doubled checked? Can someone take a look, Also this file is not tuned!!! only thing done to it is mlfhn and krkte and tvub. I need to get fueling down before any tuning happens. Thanks for the help in advanced. I could tune injectors but I have not adaption happening so tuning would be done blindly.

I did not look at the file, but did you just copy straight up Maf maps from 4.2??
Itc it is not done correctly. As you are not using 4.2 Maf housing. You need to copy Maf maps from 4.2 and also scale for larger housing.

As above, running an S4 sensor and a different housing means that you don't just copy the S4 settings, you need to scale for the change in sensor size too.

The 550cc injectors should be pretty easy to scale - as their numbers are all over this site.

I guess you had a few beers last night judging by your post.. :p

I copied 4.2l maps, I have a s4 4.2l maf and sensor from a 4.2l

maybe your MAF is shit?

I'd run the stock sensor and housing with the MAF maps back to stock to verify.

You could then try the stock sensor in a larger housing and scale as a sanity check.

There's a program on here called MAFAdjust that will scale your MAF map based on old and new housing size.  I use it all the time... works perfect.

One problem, my turbo inlet is 4 inches haha So I'm going to buy a new sensor today just to verify. Which there was a resistance test you could do to test sensor but I'm just dreaming. Will get back to you guys in a couple of hours. Do you guys want my xdf to verify?

nothing a little duct tape can't fix!

Edit:  I just realized you're talking about a 4" MAF housing on a 1.8t.  I've personally never ran that large of a MAF housing on a 1.8t or read anything about it, not that that says anything, but perhaps the 4" is just way too large for the velocity of air at idle on a 1.8t?

people are running with map and I don't get it as the injectors never adapt? is there a way to get lambda adaption without maf?

Did not realise this was on a 1.8t.  You'll never have enough low down air velocity to run a 4" MAF well.  What is your target HP and why are you running a 4"?

That is a ridiculous MAF to use on your project.

is that a hitachi or bosch maf?

MLOFS?

Well it was in the kit i bought. What maf should I be using? The inlet to my turbo is a 4in so what should I be running? I would be happy with 380-400hp. I don't want to run a huge maf I agree it was just in the kit so I'm trying to use it.

Bosch

Alright to end this problem and to tune my daily properly I have bought a 3in to 4in rubber inlet hose that does a 90 degree turn so it will fit. I have purchased a vr6 3in maf housing and I'm buying a new s4 maf. I had chasing my tail so all brand new parts will be set for success.
I will then use the maf calculator which I need to search more on and then hopefully I can tune the car properly

Name of kit? Or perhaps a photo of it?

I bought the kit from a local guy that ran the 4in maf housing. Kit as in a deal made on the street.

What in the world made you think this kit was a good idea?

I'm running a strong 350bhp on a 3" VR6 MAF and haven't pegged it yet, you'll be fine.

use the stock maf sensor and a larger housing and call it a day.

The 4.2 V8 MAF is capable of 1500-1800 kg/h depending on which one you are using. There is pretty much never a reason to put it in a larger housing.

???
Since prj is still keeping his Speed Density patch to himself I do not agree with you! Perhaps we can hope for some more info about pulsation handling and filtering soon. I don't think prj would loose business from revealing a bit more. I guess he has enough work to do every week anyway.

I don't understand how one relates to the other I guess.

Are you moving more than 1796 kg/h (498.89g/s)? If not, leave the 4.2 MAF in the 83mm housing.

Of course it's better to not scale if not needed but if you have much WHP, the oem 4.2 housing is too small.
I mentioned speed density since we wouldn't need scaling at all if that was available. Up to 4.2 MAF, no need for scaling. Above 4.2 MAF limit, use speed density without MAF.

So should I just go with a vr6 maf with vr6 housing or go with 4.2l maf in a vr6 housing?

whatever you have a correct table for. If you can avoid scaling do so. That being said, a well scaled table would work fine too.
I'd try to avoid 4.2 in vr6 but I don't know limit of vr6 in vr6 housing and if that is enough for your goals.

I have decided to purchase a 2.7t Bosch maf that is in stock housing  which is 3in. Now I'm waiting on silicone 3in to 4in hose to come. Car is running fine on my tuned file except I have 0 boost? How is that even possible? I hit like 2 psi and this is nothing hooked up except just spring pressure? How is this possible? I got injectors scaled decently so I thought i would try and see how some boost feels. But nothing :(
Tested external waste hate and no tears and when I apply air the valve moves so I know its good. Next i tested my diverter valve, it's good. How is this even possible!

SMH

Yes call me the problem child haha

I'm gonna go with massive boost leak.

I guess I'll be making a 4in coupler to go over the turbo and boost leak test it. Crossing my fingers

You are making claims without any sort of support. I have cars over 600whp on the 4.2 housing.  What do I do for cars over 600? I run an 85mm HPX setup.

I was a bit unclear. I Think you missunderstood me.

What I meant was that up to the limit of 4.2maf in oem 4.2 housing there is no need to scale since it's better to buy a MAF matching Power goal and as the top one buy the 4.2 v8.
If you want more and especially much more than the 4.2 can support it would be nice with speed-density. But as you say there are alterantives when going beyond 4.2 v8 like hpx.

So I boost leak tested the car and no leaks. Can I blow my car up yet!!! Urghhh
Next I'm taking off this external waste hate to make sure the valve is seating properly. Can I boost this big turbo with stock timing tables? I feel as if I should have no problem building at least 10psi but 2psi?

I would consider retarding timing a bit at peak torque, then adding it back in bit by bit, but that's me.

Well I have 2psi of boost on a big turbo set up? How is this even possible? I hate not having boost.

Because you have no idea what you are doing and are blindly stumbling around in a dark room, filled with glass. You are going to slip and break something.

boobs.

Now we're talking.

(http://i795.photobucket.com/albums/yy231/k0mpresd/04801BB2-C7DF-43EA-8A07-09B84C274A04.jpg)

"I keep filling one of my tires with air, but it keeps going flat. How is this even possible? I hate having a flat tire."

love you to dad

If you get a big enough turbo you may be able to overcome a boost leak. It would require pressurizing the entire atmosphere however, so plan for a very large one.

 ;D

Okay, so I logged throttle position and it only goes to 35%. Why is this? It's cutting load by using the throttle. I'm guessing this is because I have no maf yet?

I HAVE BOOST!!! LIFE WITH BOOST!!
After hours and hours I started from square one, I just added a huge turbo to the car! so boost isn't going to come on till 4000 rpms so throttle plate angle might be out of wack and pids are going crazy. So I played with a couple maps and sadly I had to change a safety map. So now it's time to learn these maps and get the full meaning behind them.

KFVPDKLD-Max pressure ratio (throttle plate) for ldra diagnosis - Max. zulässiges Druckverhältnis DK für ldra Diagnose
KFMSNWDK-Map for scaled mass flow over throttle valve
KFWDKMSN Map for target throttle angle

I recommend getting a MAF before trying to tune.

I am going to have to ban you from this site. You just refuse to do things the right way, and I don't need anyone else following in your footsteps. Please, next time you post anything I want a full explanation of what you changed, WHY you changed it, and how it impacted the vehicle. Failing to do this will result in disciplinary action.

Or even posting DTCs when completely baffled why your motor wont run, instead of screaming how the sky is falling and there is some strange mysterious force at work.

(http://thefw.com/files/2012/07/tumblr_lsljpp2RRE1qhzhglo1_500.jpg)

Okay can you delete this topic and I'll start from scratch and post logs for everybody. Do you want me to post values that i changed them to?

More importantly, don't bother posting anything until you have no DTCs.

I won't, my maf has come in.
Maf= sensor and housing from a s4 2.7t not v8 4.2l. Will this be fine?

That maf is good to approximately 320g/s. You tell us, do you expect to push more than 320g/s (300hp) through your engine?

Isn't 320g/s closer to 400hp at the crank?  g/s * 1.2 ~= hp

That's what thought? So which one of you are correct?
Or could I just put s4 sensor into the 2.7t housing? I'm scared to do that as I have never scaled a maf. I know there is a tool floating around here.
So put 4.2l sensor in the 2.7t housing work?
I heard stories of a maf sensor scaled wrong could be a bad.

If you can't select a proper maf and scale it correctly...

When I speak hp, I speak wheel hp. The only measurable medium.

well progress has come to a quick stop for a bit

what did you hit?

A dirt wall! Nobody was harmed, just bruised from seat belt but hey I'm alive!

Ouch, glad everyone is ok though! All the best.

thank you! So big turbo 2.7t next?