xr4tic

So no more blown MAFs

At first, I decided to try it with the stock MAF in a 3" housing:

<a href="http://johnbaas.dyndns.org/2point0/maf_bosch_blow.jpg" target="_blank"><img src="http://johnbaas.dyndns.org/2point0/maf_bosch_blow_lo.jpg"></a>

The IC and TB are 2.5", so two transition adapters were required. Eventually, I'll be going to a 3" VR6 TB, so only the inlet adapter should be necessary.
I also had to extend the MAF wires.

In this configuration, the car ran the best it ever has. The Long Term Fuel Trims were within 1%, before they would be slightly lean at slow speeds, and slightly rich at faster speeds.

Unfortunately, I don't think the MAF element would last very long. I just don't trust it to handle the pressure, temps, and possibly oil going through it.

So I talked with Pro-flow about making a MAF that would work for me. Something that won't burn out, and can handle a blow-thru configuration.
They said no problem.

Top:
<a href="http://johnbaas.dyndns.org/2point0/maf_univer_top.jpg" target="_blank"><img src="http://johnbaas.dyndns.org/2point0/maf_univer_top_lo.jpg"></a>
Side:
<a href="http://johnbaas.dyndns.org/2point0/maf_univer_side.jpg" target="_blank"><img src="http://johnbaas.dyndns.org/2point0/maf_univer_side_lo.jpg"></a>
Inlet:
<a href="http://johnbaas.dyndns.org/2point0/maf_univer_in.jpg" target="_blank"><img src="http://johnbaas.dyndns.org/2point0/maf_univer_in_lo.jpg"></a>
Outlet:
<a href="http://johnbaas.dyndns.org/2point0/maf_univer_out.jpg" target="_blank"><img src="http://johnbaas.dyndns.org/2point0/maf_univer_out_lo.jpg"></a>
Installed:
<a href="http://johnbaas.dyndns.org/2point0/maf_univer_blow.jpg" target="_blank"><img src="http://johnbaas.dyndns.org/2point0/maf_univer_blow_lo.jpg"></a>

The stock nonDBW Bosch meter has a funky transfer function (voltage vs. airflow) so it will either require an A/F controller (Split Second PSC1, Pro-Flow MAFTuner, or similar) or it will have to be changed by tuning a chip.

The stock Bosch MAF in a 3" housing will flow about 811 kg/hr at 5V.
The Univer can be programmed to flow double that at 5V, if you so desire

I've got the flow data for the meters, I'll have to whip up an excel sheet with some graphs.

I'm still fiddlin' with the tuning. I think I need to add a short section of 3" tubing in front of the MAF, so it doesn't have the transition disrupting the flow.

StevenH

Seeing stuff likes this makes my happy I'm probably going to end up going with a PES kit instead of the t3/t04e setup. I found a deal on a used kit that is pretty hard to turn down and it will save me a quite a few headaches for sure. Keep up the good work though.
Steven H

xr4tic

The whole MAF thing can be simple or hard, depending on exactly what you are trying to do.

Dead

The wiring is just temporary,right? Just nod your head yes. ;-)If APR rents the strip for next years BBQ,it might prove to have some interesting cars making runs. Might even have a 12v whip with some humph.

StevenH

I'm still going for 280 at the wheels but I think I'll be using a bottle to help me get there. I think this route is going to be a hell of a lot easier for me too considering my limited mechanical ability. I wont have to worry about custom fabrication or spending a fortune for a dyno tune. The only labor I'll probably have to pay for is the clutch install which will be dirt cheap since I'm working at a VW dealership this summer . If I had a lot more time and money on my hands I would probably still be going with the t3/t04e route but my summer is already packed and first semester next year is going to be a rough one.
StevenH

CharlieGSanD

lookin good

xr4tic

for $20 <a href="http://www.bakerprecision.com/purosil5.htm">http://www.bakerprecision.com/purosil5.htm</a>
They're pretty slow to get things shipped though, so I bought the black transition from <a href="http://www.hosetechniques.com/">Hose Techniques</a> for $21 and they ship the same day. All they had was black at the time, now they have more colors.

Yes, the wiring is temporary, they gave me the little scotch-lok things or whatever they are to splice in the Ford connector.

xr4tic

I got some other stuff from them, and the transition was on back order, so I got it from somewhere else, and I don't remember where, but it took them a while to ship also.

Hose Techniques is almost identical, but with much faster shipping.

Audiboy

Nice! I'll be checking on your MAF development

xr4tic

<img src="http://johnbaas.dyndns.org/2point0/flow.jpg">

It's flow (kg/hr) vs. voltage

unfortunately, without larger injectors or some chip programming, the extra flow capability is wasted. I need to find out if I try and drop the flow curve for larger injectors, how much it will affect the timing tables.