Cascade Crew

[90droptoproc]

needed one for my car, ended up with two by mistake
anyone need one?

[Danked]

i might take, how much?

[Dewey316]

it won't fit your car danked.

[90droptoproc]

ya this one only fits V8's sorry

[blue89]

this would fit an LT1 tho huh?

[90droptoproc]

should fit, but check with some of the more LT1 inteligent peoples on the site

[Twilightoptics]

Why would you need it for LT1? LT1's need elbows.



I, however, might be interested.

[Dewey316]

Are you sure you need an elbow for an LT1? you could run the air thru the snorkles.

What years LT1's are SD and what years are MAF?

[Twilightoptics]

I thought they were all maf?

[Dewey316]

I just checked 92-93 LT1's were SD, 94 was the switch to MAF.

[blue89]

I know mine is maf, its in my backyard! Right now tho, the intake goes straight over and draws from the driver side and has the nasty little intake resonance horn thing as well as some turns in the intake to accomodate. I wouldn't mind moving the MAF so it can use a dual snorkle intake.

[Quasi-Traction]

Ok, a little off topic.....just because I always wondered

What's the difference between Speed Density and Mass Air Flow induction systems?

[Al Hasse]

Found sort of an explanation on a Z28 board

http://www.z28.com/forum/showthread.php?t=5808


http://www.z28.com/forum/showpost.php?s=a977d893b0042cb5c673a660a41c55f8&p=34729&postcount=12

[aaron_sK]

MAF: wire in intake duct (before throttle) with voltage running through it. More air = different temp = voltage change, so the ECU knows how much air is coming into the engine.

MAP = sensor in the intake that measures pressure. Voltage changes from that sensor essentially do the same thing as with a MAF.

*Edit: Al beat me to it.

[Quasi-Traction]

That cleared it up a little. I think I more or less get the jist.

One take air speed and temp that the motor is taking in through the throttle body---Mass Air Flow

The other mesures the pressure of the air coming through the upper plenum and adjusts how much fuel to inject into the motor accordingly---Speed Density.

Cool.

[aaron_sK]

[blue89]

kinda? MAF measures the amount of air directly. Very accurate. Speed Density systems calculate the amount of air by measuring temperature, pressure, o2, and throttle position. If any of those sensors goes bad, the whole system goes into band-aid mode. Plus if you make changes to the intake system or port/polish or anything, you should readjust the ecm because the system is more efficient (drawing more air = lean). MAF is better, but SD offers more flexibility for changes in intake design and is more robust.

[Dewey316]

I wouldn't say either is better.

Speed Density, calculates the VE of hte engine, based on tables that relate calculated engine load (via map sensor) and then compares that to RMP's to determine the pulse width for the injectors. MAF's advantage is directly reading air-flow. Now, there is a draw back, it has to add a set ammount of fuel at that air flow.

SD has an advantage of being able to measure possitive pressure, so it works great for applications that have boost. Even OEM systems that used MAF on turbo applications, added a MAP sensor, to use a hybrid SD system for adding fuel under boost.

I wouldn't say either is better, the key is picking the one you can work with in your application.

[90droptoproc]

still got this if anyone is interested