Fast Efi

[SuperBuickGuy]

I figured I'd give a running commentary on my experiences with the FAST system.

Overall, I really like it - it's so easy to install, and it's flexible enough that even I can install it.



mostly it's installed - I changed the fuel lines for stainless, but had I not, everything I needed was included.

I did have the initial issue on the 02 sensor, it works, it works fine at the collector on my hooker side pipes

I did make a mistake on the wire for key - on, the lug I initially used was only powered when the key was in the run position; obviously it needs power when the key is in 'start' as well. My second mistake was not checking the lug I connected to.... was an always on power... oops. (I was working under the car and fuel pump was cycling - I was thinking "what's that?")

Tuning
Here is where it gets fun

So I've warmed up the car, and I eliminated my hard-wired temp switch that turned the fans on.... because FAST has a wire that's supposed to turn the fans on.... it didn't, despite the temperature and everything else being wired working correctly.

For some reason my temp gauge no longer works (ug)

The tune is a base tune, but does not do a terribly good job of keeping the idle up when its cold. I'm going to mess with the IAC, but the documentation with the kit did warn that some adjustment was required - between "target idle speed" and the adjustment to open the throttle blades (why an allen screw, Fast?). It would be nice if the system had a fast idle circuit that opened the blades up until the temp came up - it does not, it's all IAC, which simply is a value of 1-5....

Anyway, was tuning outside (no carbon monoxide poisoning for me) and it started raining... so done for the day.
Of course, car wouldn't start to drive back inside; the fuse for the MSD ignition decided not to have connectivity... ah the joys of cars.

 

[SuperBuickGuy]

yes, the air filter is just sitting on there. I have big plans for cold-air but not done yet

 

[pancake]

Bah.. You act like CO poisoning is a bad thing.

 

[mrvette]

Bah.. You act like CO poisoning is a bad thing.

EH, depends on which way the wind blows.....:drink::crylol:

 

[SuperBuickGuy]

So I drove it today (it's so cool having a car with both lights and windshield wipers)... this thing is a go-kart. I used to race shifter Karts, and seat-of-the-pants-analysis on very damp roads (very moist in top gear parlance) is wow. 400 hp, 4 speed, wide-low-profile tires, wet roads, what could possibly go wrong?

And the computer has much to learn about keeping this thing running.

 

[SuperBuickGuy]

So my fans aren't coming on - even at 217* (despite being set for 200*)
Checked everything, all checks out except no signal (I thought) to the relay.
So I called FAST

The wire, blue, that turns on the fans is a ground - it's an open circuit then grounds when the fan is to come on. My system was wired through a dummy switch where positive came into the relay to engage the fan circuit, so I simply need to rewire my entire system..... :thumbs:
:cussing::tomato::rain::hunter::hunter::club:

 

[mrvette]

So my fans aren't coming on - even at 217* (despite being set for 200*)
Checked everything, all checks out except no signal (I thought) to the relay.
So I called FAST

The wire, blue, that turns on the fans is a ground - it's an open circuit then grounds when the fan is to come on. My system was wired through a dummy switch where positive came into the relay to engage the fan circuit, so I simply need to rewire my entire system..... :thumbs:
:cussing::tomato::rain::hunter::hunter::club:

NO you don't, take the other end of the coil, from the computer that ground IT'S end, and put it to a switch +12, yellow wire of WSW is easiest, or maybe Brown under the dash.....long as in the start position/when cranking, the thing is dead, so fans can't be turned on till you relax key to RUN position.....I don't set around listening to radio, so I forget if that brown wire is live in the ACC position....I do know the yellow wiper wire is not active then.....

:nuts:

 

[SuperBuickGuy]

So my fans aren't coming on - even at 217* (despite being set for 200*)
Checked everything, all checks out except no signal (I thought) to the relay.
So I called FAST

The wire, blue, that turns on the fans is a ground - it's an open circuit then grounds when the fan is to come on. My system was wired through a dummy switch where positive came into the relay to engage the fan circuit, so I simply need to rewire my entire system..... :thumbs:
:cussing::tomato::rain::hunter::hunter::club:

NO you don't, take the other end of the coil, from the computer that ground IT'S end, and put it to a switch +12, yellow wire of WSW is easiest, or maybe Brown under the dash.....long as in the start position/when cranking, the thing is dead, so fans can't be turned on till you relax key to RUN position.....I don't set around listening to radio, so I forget if that brown wire is live in the ACC position....I do know the yellow wiper wire is not active then.....

:nuts:

that drove me cross eyed.... I lost you at "don't" everything else after that word doesn't make sense

probably the issue is me, though as I see could do a a bit better of an explanation

the blue wire is from the FAST efi computer. According to the tech (and the folks that warranty this crap.... err, finely tuned American product) when the fans are to come on, the wire becomes a ground. I'll draw power for the switch from the switched source on the fuse panel (the one that doesn't work for running the computer because it isn't powered while the switch is in 'start' position).

the blue wire I ran originally was from my "misc. wire box" it wasn't on the Corvette (I can't swear to this because I have know idea of the heritage of this wire, perhaps it's one that, if put on CF, is all that keeps a 99 point car from 100 points... dunno, but that would be pretty awesome if that were true )

 

[mrvette]

So my fans aren't coming on - even at 217* (despite being set for 200*)
Checked everything, all checks out except no signal (I thought) to the relay.
So I called FAST

The wire, blue, that turns on the fans is a ground - it's an open circuit then grounds when the fan is to come on. My system was wired through a dummy switch where positive came into the relay to engage the fan circuit, so I simply need to rewire my entire system..... :thumbs:
:cussing::tomato::rain::hunter::hunter::club:

NO you don't, take the other end of the coil, from the computer that ground IT'S end, and put it to a switch +12, yellow wire of WSW is easiest, or maybe Brown under the dash.....long as in the start position/when cranking, the thing is dead, so fans can't be turned on till you relax key to RUN position.....I don't set around listening to radio, so I forget if that brown wire is live in the ACC position....I do know the yellow wiper wire is not active then.....

:nuts:

that drove me cross eyed.... I lost you at "don't" everything else after that word doesn't make sense

probably the issue is me, though as I see could do a a bit better of an explanation

the blue wire is from the FAST efi computer. According to the tech (and the folks that warranty this crap.... err, finely tuned American product) when the fans are to come on, the wire becomes a ground. I'll draw power for the switch from the switched source on the fuse panel (the one that doesn't work for running the computer because it isn't powered while the switch is in 'start' position).

the blue wire I ran originally was from my "misc. wire box" it wasn't on the Corvette (I can't swear to this because I have know idea of the heritage of this wire, perhaps it's one that, if put on CF, is all that keeps a 99 point car from 100 points... dunno, but that would be pretty awesome if that were true )

OK, I dunno shit about anyone's color codes, and just remember from olde tyme GM OEM, best I can.....but IF your shark has a later intermittent wiper, I not sure of the wiring colors....BUT you need to find a +12 wire to take that hot side of the coil to....Talking about the coil that is in the main FAN on/off control relay.....their computer grounds one end of that coil, so you need a switched +12 to the OTHER end of that coil, IF that was grounded, all you have is two grounds, one on each end of the coil, and so nothing ever happend, relay don't close, and you got nothing going to the fans......main power is never applied.....MAIN power is always live from what is essentially battery power.....

SO, you need figger out maybe TT's suggestion about the fuse block is easier for you, take a VM to some extra terminals and figger out which one is live with key in RUN position, but not any other.....

and use that one for your COIL +12 power ONLY....not main fan power....

got to comprehend we are using control/LO power to run the fan relay, one end is a sensor on the ground end, control where relay closes and opens, OTHER end is to allow relay to close at ALL, only when engine is running, so as not drain battery for no reason, like some imports do.....

:nuts:

 

[BangkokDean]

Question, what do you use for a Dizzy advance with this fast FI?

 

[SuperBuickGuy]

Question, what do you use for a Dizzy advance with this fast FI?

IIRC 18* - I haven't changed it from when the carb was on it. The spark system is an MSD 6AL, billet HEI, and performance wires that were laying about.

 

[mrvette]

Question, what do you use for a Dizzy advance with this fast FI?

IIRC 18* - I haven't changed it from when the carb was on it. The spark system is an MSD 6AL, billet HEI, and performance wires that were laying about.

18* initial?? you have no issues with hard hot starting?? very strange if so....

anything over 12 always gives me that issue for some reason.....do you have vacuum advance on it?? and how much to the weights give at say 3krpm???

:nuts:

 

[SuperBuickGuy]

Question, what do you use for a Dizzy advance with this fast FI?

IIRC 18* - I haven't changed it from when the carb was on it. The spark system is an MSD 6AL, billet HEI, and performance wires that were laying about.

18* initial?? you have no issues with hard hot starting?? very strange if so....

anything over 12 always gives me that issue for some reason.....do you have vacuum advance on it?? and how much to the weights give at say 3krpm???

:nuts:

gear reduction starter - and originally I did have issues; but it was more carb related and related to that *&^%%&!!! out-of-round flywheel - the thing spins over beautifully now.

7* on the weights
10* on vacuum - I have a vacuum advance that is adjustable, and I can lock it to only give X degrees of advance rather than the full 15 that most give.

35* max advance.

 

[mrvette]

Question, what do you use for a Dizzy advance with this fast FI?

IIRC 18* - I haven't changed it from when the carb was on it. The spark system is an MSD 6AL, billet HEI, and performance wires that were laying about.

18* initial?? you have no issues with hard hot starting?? very strange if so....

anything over 12 always gives me that issue for some reason.....do you have vacuum advance on it?? and how much to the weights give at say 3krpm???

:nuts:

gear reduction starter - and originally I did have issues; but it was more carb related and related to that *&^%%&!!! out-of-round flywheel - the thing spins over beautifully now.

7* on the weights
10* on vacuum - I have a vacuum advance that is adjustable, and I can lock it to only give X degrees of advance rather than the full 15 that most give.

35* max advance.

THANKS, I was afraid of that, the Motor HOme has the olde tyme starter on it, and so I had to retard the timing from what Bird had said to put it on, the thing bucks BAD when hot.....the vette already has a Gear starter on it, due to old one failing, for a LONG time now.....

Out of round FLYWHEEL??? never heard of such a thing, WTF???:shocking::crap: I gotta play with the camper some more.....

 

[SuperBuickGuy]

Pictures.... note how one side of the flywheel has full contact and the other doesn't (nor full depth)



this flywheel informs on a truck that I had when I was in my teens that I couldn't adjust the starter right for anything.... :clobbered:

 

[mrvette]

Pictures.... note how one side of the flywheel has full contact and the other doesn't (nor full depth)



this flywheel informs on a truck that I had when I was in my teens that I couldn't adjust the starter right for anything.... :clobbered:

Looks more like a flexplate to ME, and I have never seen one do that, any idea if it's OEM or aftermarket?? china maybe?? no wonder it gave you a cow.....:club::nuts:

 

[SuperBuickGuy]

I have no idea where it came from; I do, however, know where it's at now :devil:

It will be back, I'm sure, in Walmart's "Amerika" section prrtt:

 

[BangkokDean]

Question, what do you use for a Dizzy advance with this fast FI?

IIRC 18* - I haven't changed it from when the carb was on it. The spark system is an MSD 6AL, billet HEI, and performance wires that were laying about.

Thanks, But where does the advance hose connect to? Do you have a picture showing how it connects? Thanks

 

[SuperBuickGuy]

It's the vacuum hose on the left - into the base plate. The hose on the right is for the pressure regulator

 

[BangkokDean]

It's the vacuum hose on the left - into the base plate. The hose on the right is for the pressure regulator

OK thanks ....I assume the instructions that came with the FAST unit gives you all these details?