View Full Version : next bottleneck point

08-06-2003, 01:57 AM
ok i have a 92 sc motor in a 98 mustang
mods are as follows

cai , 80mm maf , asp underdrive set , asp 10% overdrive pulley ,
stock 98 mustang tubular headers w/ 00 gt takeoff catback exhaust , custom fordchip, 3.73s w/ posi ,

my throttle body is stock 60mm is this the next bottle neck
also with a 70mm throttle body will i feel a big increase?
and were is the increase in the powerband

btw i'm hitting 14 psi max

08-06-2003, 08:51 AM
You won't feel any big increase with the 70MM throttle body, but it looks a HELL of a lot nicer. :-) What's done to the internals of the engine? The more you do there, the more you'll see a difference with the 70MM throttle body.

08-06-2003, 09:50 AM
Throw that bigger throttle body on there and then get a dyno tune. That'll about max you out until you can do some head work.

08-06-2003, 06:46 PM
i also forgot to mention a 1" raised top (mouth was widened also) and my supercharger has 160k miles on it (motor has 52k)
long story bought two motor one without the sc
will i feel any gain going to a low mileage 94-95 blower w/ a 89-93 stack pulley on it ??? if thats not my problem then i dont know what it is

SC Ward
08-07-2003, 10:36 AM
You should definitely notice the change with the late blower,
but pulleying it back down, it might just even out.
With the early stock pulley, it will only show about 13#,
but will generate less heat doing it.

What kind of intercooler you running?
Got pics?

I presume you already replaced the anemic stock fuel pump;
otherwise you probably would have leaned out
& burned a piston by now.
If you got the 36# injectors with the late motor,
you want to use those next time you tune.
The EEC tuner is a good thing to have, but kinda pricey.

Since you have a Stang, you can get MAC longtubes
for a paltry $250; i'd recommend that.
Get the smallest diameter tubes available,
so as not to kill the low end tork.

Send the heads and cam from that spare motor to Dr.Fred;
You'll be very happy with the results,
and you won't have to sell the farm to go fast.

08-08-2003, 01:39 AM
i have not yet replaced the fuel pump as 98 stangs have a 140 lph stock one. also my motor is running rich if anything and i have a 255lph sitting in a box but i have to empty my tank (will change it this weekend along with the fuel filter

right now i'm running a stock sc ic i'm going to have a double core unit welded up soon

i have pete at fordchip do all my tuning and i have 30#ers on now but will go to 38's or 42's this winter (with the car in storage)