I have an ATI Procharger with intercooler that peaks at 10psi @6000RPM. 94 GT 5 spd, stock motor except for Ecam as you can see below.
I'd like to clarify some of the posts on this thread with the experience I've had with mine.

My supercharger never affected my idle or driveability. The dump valve is open until you nail the throttle so the engine operates as normal.

The FMU jacks up fuel pressure proportionately to manifold pressure. It does not affect idle or light throttle fuel mixture at all. It acts on positive manifold pressure only (boost conditions) which you only have when you nail the throttle pretty heavy.

My boost level is exceeding the limits of my 19# injectors to the point of lean out pinging in cold dry weather. (I thought it was timing but it isn't). The FMU is already raising fuel pressure over 100psi. I would run 30's or higher if you could. It would be best to have injectors big enough to run without an FMU. You can do a search, I think even on this sight, to get a calculation on what size injectors to run based on HP.
my 2 cents

Tweecer...
 

Interesting website at tweecer. I especially like the link to the forum with tweecer users to derive optimal settings.
$500 plus the widebands though....I would like to hear some more about it from users. I think it would be great, despite the fact that even the tweecer website says there "is a great deal of trial and error".
I think the ability to switch operational programs like that would be great for the weekend racer.

Go with the 42lb injectors and bypass the FMU they suck. Set your timming at 10 degrees and go from there. Then GET A CHIP. It is a must with any blower. Your idle will probaly suck with the e-cam I know mine does. If you set your base idle to 1000 rpm's it will help a lot. If you plan on running a/c forget about it. You will have constant idle problems there. Good luck:)

What would be better, a chip? or the twECCer? or somthing else? I was told yesterday that with a computer that is programable that I don't need the FMU or BTM. If so it is cheaper for the twECCer than a custom chip and a BTM. I would enjoy having the ability to tune the computer, raise the rev limiter and all that stuff.

Tweecer...
 

88Workcar,
The tweecer website says there is a dedicated yahoo chatroom for tweecer users who discuss and trade programs for various applications. I'm sure you could go there and get some idea/feedback on the viability of the unit.
Like I said, the price is around $500 plus widebands and that is just for the basic unit. The data logger option sounds like the best to me, but I am just beginning to investigate this too. It sounds expensive though, but what isn't in this hobby?

"Calibration data includes:
Engine displacement
Injector size
MAF function
Base / Stabilized / startup fuel mixture
Base / Altitude / Limp mode timing tables
94/95 AOD-E shift points, TV Pressure, etc
Drive & Neutral idle rpm
Neutral & in gear rev limits
This is just a brief sample of the data locations which may be modified.

Do you have a custom chip, why start from scratch, you pay shipping to and from us and we will read it and send it back to you. Free! Just flash the bin file to your TwEECer and you have a good solid starting point and a calibration you know is safe, now start modifying that file and save it to one of the other 3 calibration locations you have available"

WARNING:
YOU MUST HAVE KNOWLEDGE AND UNDERSTANDING OF CHANGING EEC PARAMETERS OR YOU MAY NEGATIVELY AFFECT YOUR CAR’S PERFORMANCE!

TwEECer RT
- Real Time data logging, viewing and playback
- includes CalEdit, CalCon & cables.
$550 + $11 shipping
Texas Residents must pay sales tax

I think as soon as I find a wideband 02, I 'm doing it!!!
Look at the dyno pulls on the website...interesting stuff.

100 psi is too high.

How much boost?
 

Saleen.
Those are nice numbers for your 347. How much boost are you running at what RPM? Is yours a daily driver?
Thanks, just looking forward to the day when I can slap a 331 in...I can't believe it either...

I have a powerdyne 6# unit. I rarely ever see this many people with superchargers in one thread. Is there anywhere to go to on the web that has forums for supercharged cars? Sometimes I need something answered related to my s/c and I can't seem to find anyone who knows. Thanks, Keith

I have my wife driving a supercharged 95 with the Vortech V1, i believe it's only like 5 or 6 lbs with the 155lph pump, X-pipe, FMU, and 9mm wires. We have no idle problems and no pinging as long as we stick to 93+ octane, I am sending the unit back to Vortech tomorrow for a bearing rebuild only after 21k miles. I am also going to upgrade to the 10lbs pulley and a trickflow intake and cooler plugs. We are still utilizing the stock 19lb injectors with the FMU. Do you guys think we we start having problems with the upgraded boost to 10lbs or not yet?

Hey Hozer and 88Work car and for that matter anybody else interested in the TwEECer you also should check out this link:http://tweecer.oplnk.net/ They now have a message board too, the Yahoo chat thing is really hard to follow...
And for widebands look at these links: http://www.diy-wb.com/info.htm
http://www.techedge.com.au/vehicle/wbo2/
http://www.lambdaboy.com/
http://www.fjoinc.com/automotive/WBO...dairfuelk.html

The last one is not a wideband and I don't know much about it but some guys at the corral were swearing it was as accurate as the dyno shop widebands they were comparing it to...

supercharged forum...
 

I'm not sure how many of us there are...but I think it's a great idea to have a supercharger forum..
I'm going to take a long hard look at the tweecer sites tonight. If my MAC cat back sells on ebay soon, I'm on it!....
I just finished swapping my equal shorty headers for some new ones...damn. What fun! Taking motor mounts off! Joy! (Yes I have had several beers)...found wet oil and a bunch of crud(and I mean debris) on the tip of the number 5 plug...uh oh..hope I haven't blown something....

I am all for a supercharger forum, I often have to go to the Corral for supercharger info... :( Don't get me wrong, the Corral is a nice place and all, but Mustang Works is my home. ;) Let's talk to Dan about it!:)

I think a supercharger forum is a GREAT idea!! I always have to go to Corral or Stangnet to get answers to some of my questions.

HOZER, What would you car dyno with the blower disconnected? I am impressed with 460ftpd with 8# of boost.

Non-blown torque numbers...
 

Before the blower with a misfire due to a bad PIP sensor in my then Mallory billet distributor (never, ever buy this piece of junk, a $225 mistake) it did 330 ft/lbs after some dyno tuning. I have to admit it was more the guys at the shop than me at the time, tweaking my a/f and my timing just right.
Of course now it seems I have a bit of a valve guide problem with number 5 cylinder...great, happy f-ing new year....

88 workcar,
I must be part of the minority . My S trimed engine ran a 10.13@135 with base timing and a BTM . No chip ! Idled fine. Don't get all caught up in chips/fmu's and everything. I know quite a few guys who run and have ran up to 12lbs of boost with 30lb injectors. Although 42's are nice, they usually reqire a chip because the car just won't idle with them. If I were you, I would make sure the ProM 77 is calabrated for a supercharger. ( That makes it 10% richer everywhere but idle. ) Put the 30's in, base fuel pressure at 45lbs, get a big fuel pump. Then, first thing, put it on a dyno with a wideband and see where you are at. If you are interested in how I ran my timing, let me know, I will tell you what and where I had everything.

Tim:cool:

Tim, FMU or not?

I would try it with no FMU. But again, the true test is with a wideband. You have lots of money and a nice car, you don't need to granade the engine over $100 dyno session. If it turns out you need more fuel, larger injectors would be the way I would go. But, you have the 30's now, try them.

FMU or Not...
 

What 302 is saying is true. I am not saying it is impossible to achieve good results w/o the aid of a chip. I just think it is money well spent.
If you drop the several grand for a blower setup, the extra couple of hundred was the best way for me (and for many others) to achieve optimum efficiency for their setup.
It allowed me to utilize known optimum fuel and timing curves for my combo.
Translation = Minimal guess work
Is it mandatory? Of course not.

That tweecer rt sure is nice though...

I agree with Hozer 88GTConv, there are a bunch of ways to skin a cat. But, being new to Superchargers, it can be overwhelming on what you need, and what you have to have and what you need to get. Again , on my S trimed car, it was so basic it wasn't even funny. But it worked great. That is what I wanted to share with you so that you don't get sticker shock on all these have to have items.