thinkin about supercharging(v1-A trim)

Yea, I would still think you would need the fmu, Specaily since you wont to go with 9psi.

I think you would need around 42# to get away with 9psi.

One thing you could do is get a leaner fmu, I believe the a-trim comes with a 12:1
you could get maybe a 8:1 kit with the 30#

71swing said:

Yea, I would still think you would need the fmu, Specaily since you wont to go with 9psi.

I think you would need around 42# to get away with 9psi.

One thing you could do is get a leaner fmu, I believe the a-trim comes with a 12:1
you could get maybe a 8:1 kit with the 30#

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If the kit comes with an FMU do not change injectors unless you have a way to read your AFR. If you go with 42's you will need a MAF calibrated for them ( I say that loosely because calibrations very ) or a chip and custom tune so you can ditch the FMU. FMU's are a band aid at best and very hard to optimize. If you are going to go with the 9lb. set up on a good tune you should see around 100hp increase. If you decide to keep the FMU get a spring kit for the FMU to help you tune it. When I was looking for tuners before I put my charger on, every tuner I talked to wanted nothing to do with an FMU.

I don't think you can up the boost on an A-trim. They say buying and A-trim then upgrading it so an S-trim would cost you more than just buying an S-trim. I would send it out first, upgrade it, then install it. But it is a good deal for 1K. I would suggest 36-42lb injectors with no FMU.

I think that your question(s) concerning the FMU have already been answered. It is not the prefered method of tuning for boost.

Can it be done with an FMU? Most certainly.

Can it be done with an FMU by you? Only you can answer that but your questions alone lead me to believe that you might not have the know-how to balance both the injectors and FMU for a safe tune.

None of the above can be accomplished without one or a combination of things:

1. You need some way to determine Air Fuel Ratio if you're going to install and tune it yourself.

2. You will need the FMU spring kit mentioned above in order to vary the ratio of the FMU if you plan to use one.

3. You will need a way to tune the computer if you decide to go with larger injectors as opposed to the stockers and FMU. (Yes, even injectors below 36# in size need to be tuned. A meter calibrated for an A9L and 36# injectors SHOULD get you close but it's still a crap shoot)

4. -- or you can put it all together and take it to a qualified dyno tuner. In the long run, this will likely be your best bet and probably the cheapest route. A GOOD wideband meter wth RPM converter will cost you roughly $425 all by itself. We've not even started talking about prices of the other components you might to tune (FMU spring kits, TwEECer R/T or PMS, etc. depending on which route you take).

To sum up... if all or some of what I've typed so far is greek then you're not qualified to do the install and tune on your own and can cause serious damage to the engine.

BLOWERS ARE NOT PLUG N' PLAY (except for maybe when you install a complete kit EXACTLY how the directions tell you to, on EXACTLY the unmodified motor that it was SPECIFICALLY intended for).

Experiment at your own risk and good luck.

SVT32VDOHC said:

I don't think you can up the boost on an A-trim. They say buying and A-trim then upgrading it so an S-trim would cost you more than just buying an S-trim. I would send it out first, upgrade it, then install it. But it is a good deal for 1K. I would suggest 36-42lb injectors with no FMU.

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you can throw pullies on an A trim or use bigger crank pullies to increase the speed of the A trim just like any other blower.

Foxfan88 said:

you can throw pullies on an A trim or use bigger crank pullies to increase the speed of the A trim just like any other blower.

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The question is whether the blower is efficient enough to provide a power gain. Spinning a small blower fast, doesn't mean you'll make more power.

Daggar said:

The question is whether the blower is efficient enough to provide a power gain. Spinning a small blower fast, doesn't mean you'll make more power.

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That is more along the lines of what I was trying to get at. A trims, S trims, T trims, they are all have the maximum RPMS limits and boost limits.

from what i have heard you can get some more air from an A trim with some pullies. maybe like 8 psi on a stock engine not too sure. but i know what your saying about a blower hitting its limit.

the A trim only pushes 800 cfm where the newer SC trim and S trim both push 1000 IIRC