The first dyno run was 108hp and 99fbt, then they tuned in my S-afc and got 124hp and 102fbt isn't there something wrong with there numbers? I have intake, exhaust, s-afc, I thought, I would at least have around 160rwhp. Don't 91 na have 145rwhp stock and 160 at the flywheel? Could there be something wrong with my car?

91na intake,exhaust, S-AFC

 

you lose about 20% or so so 160 stock would be around 130 rwhp stock. so you are putting out less then stock power with mods... what is your compression at?

 

I thought the '89 only had 150hp stock, whereas the 86-88s had 146hp and 138ft-lbs. Also, a 15-20% loss of hp to the drivetrain inefficiencies is normal. But even figuring on 20%

bhp x 0.80 = rwhp

bhp = rwhp/0.80 = 124/0.80 = 155hp, so with an intake, exhaust and fuel controller you should've gotten more.

 

Who tuned your AFC? Also, do you have larger injectors? You just mentioned intake, exhaust and afc, but no other info. The stock 89+ FC's made 160hp at the flywheel. Most people get about 120-130hp stock with good compression. I would look into your AFC tuning more. If you are running rich in an N/A with just those mods, it will easily kill your HP numbers.

 

which exhaust?

 

89+ cars are only good for ~125 rwhp stock in good condition. What kind of dyno is this on? Manufacturer? Dyno results are really only comparable on the exact same dyno. However, a reasonable comparison can be made between dynojet machines. For losses, a low powered car like a fc3s has 25%+ drivetrain losses. The more power you make the less the drivetrain loss becomes. (as a percentage of the total)

For more info on dynos check out www.trackracers.org/matt/dyno.html

-Matt

 

I'm planing on get a biger throttle body, and biger injectors and msd. Thats why I got the afc, the setting on afc are,
throttle position are at Lo 20% HI 70% throttle correction sitting are at HI (thr) LO (thr)
1000 0% 1000 -1%
2000 0% 2000 -3%
3000 -14% 3000 -6%
4000 -13% 4000 +2%
5000 -12% 5000 +3%
6000 -11% 6000 +3%
7000 -10% 7000 +4%
8000 -10% 8000 +6%
The place I had it tuned was hocus pocus, the only place around me that has a dyno. At first I tried to tune the afc myself with my shity autometer a/f gauge (don't buy one) then gave up on it. Put it on a dyno for anyone that gets one. I had it so rich I think I fouled out my pluges, and did not change them before the dyno run, could this be why my hp was so low?

91 na
bones intake, pacesetter full exhaust, S-afc

 

It very well could be. It could also be the pacesetter exhaust... that was NOT a good value, even if it was cheap.

Brad

 

I did 125rwhp and 114ft-lb of torque when my car was bone stock. Heck it had bad old plugs and stuck cat too. I should be running around 130rwhp 118ft-lb of torque now with no cat and a cut stock intake box. My exhaust is some stock type muffler shop mufflers, very restrictive. I have no cats, yet the car is more quiet than a stock V6 Mustang

 

Your settings are off for use with stock injectors. Think about it for a sec. If you install this and then correct with negative numbers, then you are leaning out the a/f ratio. If you go higher in your numbers of correction, then you are pushing your injectors over what the stock control is on them. If you dont have the other stuff done to your car yet, then there is no need whatsoever to go in the +% range. I wouldn't go too far into the
-% range either. I would leave all of your LO throttle settings at 0% and trail off your HI settings from 0% at stock to say -6% at 8000rpm.

 

With our SCCA ITS cars that have no porting done, and open exhaust we put out close to 170hp at the rear wheels. Most dyno's should be within 1-2% of each other.

I dyno a 91 Convertible with Auto the other day and it only had 96hp and 84 ft lb of torque. Will be changing to a high flow cat in the next week or so, so I will we run and see what it changes

 

I knew it!!!! Thats why ask which exhaust. Beside the S-afc tunning (that I don't know jeack), the pacesetter its most likely the problem.

KNO