RomRaider

go blow through; chrysler's first turbo setups were MAP+throttle before the turbine, so there was a latency between the TPS voltage increasing and the MAP sensor voltage increasing and they had tip-in problems too.

they switched to blowthrough and the problem was diminished.


so, in summary, blow through MAF would help this somewhat.

I use blow through on my mustang. That has its own problems too. A quick stab of the throttle gets you almost no MAF reading, high boost reads different than low boost, real high boost can creat turbulence and then you're in a world of trouble, and low boost/low rpm operation is almost never right.... but it works if you spend the time to mess with it.

don't mustangs use a different type of MAF?

2 hotwires in a tube.... looks the same to me, but I'm sure 1993 ford technology is a little bit dated compared to 2002 denso technology, maybe it works fine?

Some discussion on this issue. Seems the best solution for FMIC is to go speed density.

http://bbs.22b.com/cgi-bin/ultimatebb.c ... 9;t=001164

Speed density isnt perfect either. I don't like the thought of having to re-tune everthing just becasue I changed a part, and therefore changed the volumetric efficiency of the motor. Using a MAF is alot more flexible when changing parts out because it acutally measures how much air is coming into the motor. This is a great article that explains each system, using a MAF, and using speed density.

http://www.carcraft.com/techarticles/electronic_fuel_injection/

Thats why I still run MAF in my mustang. Converted it to blow through, run a FMIC, and went from N/A to twin turbo, still havent even chipped or tuned it and it runs pretty well.... speed density (1986-1989) ones have a fit if you change the throttle body, nevermind real mods.

I was going to go blow through this past weekend, but it was too cold for one, and for two my roommate was painting his engine bay in the garage, so I left mine out to prevent overspray from getting on my car. I plan on going blow through as soon as I can though. Should be pretty easy, I already have a 3" section with a MAF flange on it, so I'll just cut some IC piping out and put my 3" section in . Then re-locate the BOV in front of the MAF somewhere.

Resurrection time.

I just have a larger TMIC, but am curious about this statement. I run 50/50 meth/water injection in my 05 LGT (I have yet to even flash my non-alky map except for testing). I live in Canada and I see a large temp swing. (-40 to 110F)

Should I also flatten out my IAT timing comp table? Makes sense to me, but this is the first I have heard of this. If so, any ideas how much?

IAT temp comp goes from 3 degrees at 14F to -6 degrees at 176F.

Thanks for the help.

Anybody?

You can pretty much flatten out your IAT ignition temperature compensation completely if you have a hot air intake and a front mount. Maybe only -1.5 or -2 degrees at 176F.

With a front mount, the actual charge air temperature going into the intake manifold is going to correlate more with the air temperature going through the intercooler than it is the air temperature going into the turbo. This is a big part of the reason I don't care for hot air intakes. You can't really use the IAT comp to adjust for ambient conditions in this situation. You just kinda have to set it flat and tune in the actual conditions you experience.

With a cold air intake (i.e. IAT should correlate if not be roughly equal with air temp through the intercooler), I'll tune a very slight and steady slope into the IAT compensation map. The newer DBW cars already have this somewhat, but some older cars are flat in the middle with a huge jump at the high and low ranges.

I had my FMIC on for a week before I gave up... converted it to blow through. Its an accurate IAT reading, accurate MAF reading (sorta), and spoolup fueling isnt an issue...

So is IAT actually measured by the MAF itself in addition to airflow?

Right now at 176F the ECU pulls 6 degrees and at 7F it adds 3.

I was thinking of cuttin git in half across the board, low temps and high temps.

Also, there is a B table that has zero's across the boars, what is it used for?

Thanks.

The IAT is intergrated into the MAF.It's the small amber bulb just to the side of the MAF.