You need boost and afr verification from the tuner. They have the ability to map both so make sure they do it. You should be making 5 to 5.5psi at peak rpm with the base pulley and anywhere from 11.5-12.5 afr at WOT to know your in the proper safe power producing range on this kit. If you just put this kit on and haven't adjusted the belt tension properly or re calibrated rrfpr adj then I guarantee one or both of these are off, and compounded with a low reading dyno. I would expect 260-270whp on a Mustang, 285-300 dynojet.

 

You CANT tune using and adjustable fuel pressure regulator, at all. You DONT need a wideband, at all. All you need to do is go on a dyno to tune it and validate whats happening.

 

you are sooo wrong! I ran my setup like this for years at 7 psi I had a static fuel pressure of 68psi my afr at redline was 11.9-12.5 depending on weather time of year and I ran a vafc to lean out the bottom as it will run rich under 6000 rpm. I then upgraded to emu set vtec at 4k rpm adjusted injector duty cycle and and had my afr a steady 11.7 about 5k to redline. made 300 hp hell with my current setup aem id1000 injectors with belt slip I made 310 hp on dyno dynamics at 8 psi temp 105f didn't take a pic but the last trip to the dyno I got 340 hp at 9 psi at 65 degrees as everyone said get a wideband and go from there good luck

 

Are you familiar with a Comptech SC kit at all? Do you understand what the components in this kits are designed to do? Based on your reply I question your experience level with this kit and possibly FI at all.

A wideband incorporated into a kit that has only a mechanical means of fuel enrichment ie (tune) I would qualify as a MUST. There is no processing involved in keeping the car in tune so some sort of easy monitoring of the afr is essential in making sure the afr is right. Some adjustments of the rrfpr are needed through the warm/cold months. If the belt is slipping, a boost gauge is a sure way to verify this. These are the two must have gauges when running this base sc kit if you want a long lived reliable set up, which this is, as long as its set up right

 

Do not listen to this individual. Listen to s2000junky and myself.

As mentioned have the tuner log afr and boost profile as well.

Sent from my Samsung Galaxy S4

 

LOL, sounds like a troll post?

Junky, RAIN H8R, myself, and many others have done so successfully with the Comptech/SOS kits. Please listen to the three of us OP if you want to save your engine and find out why you are down on power.

 

Me too.

 

I will never mod a car ever again without a wideband to monitor AFRs. Even when running the stock ECU, It has helped me diagnose so many problems, and it's great peace of mind knowing what's going on in the engine. Not only at wot but just driving around in general.

I've done a 75 wet shot set up and I've tuned my NA car on two different systems (AEM & Kpro) and I can't begin to tell you how vital a wideband was for me.

 

Preach

 

I will look for a shop that can help me put it on the dyno and log the air/fuel and the boost. Then hopefully they can adjust the fuel pressure accordingly.