my mustang is SLOW!!

[joshjwc9]

View attachment 150437

LMAO where the hell do you come up with this?!

 

[Night Shifter]

Off hand i dont know what thw codes are but i am going to assume the codes are going to read that your cats are bad.same as if you had removed them

 

[jibloni]

whats up guys?! i just wanted to hear some input on this!! this is my second mustang. its a 99 4.6 5speed and she feels very slow! previously i owned a 94 with a built aod, 4.10's, i/h/e, 75mm tb, afr 164's, e-cam, ford racing lower im, trick flow upper im, 40lb reds, 195lb fuel pump, 3200 stall, and lots more. it was alot faster than this car! i know it was built up and i have beaten several 4.6's but after driving my best friends 02 5speed gt i really wanted to get one for the reliability, 5 speed, and look.. my buddy has accel coil packs, off road x, custom flowmaster single chambers, intake, underdrive pullys, and supposedly a canned tune. the problem is i raced him and he flat out smokes me... its absolutely no competition and he burns half through second when i can just barely chirp it! what's the big deal?! how does he beat me so bad?! he is my best buddy and i know his car inside and out theres no tricks or funny stuff going on here. he only has a couple things done and its that much faster? i have replaced all the plugs and cops. when im in my friends car it has power all through the rpms when mine seems to have a mid range band that it likes. the power straight flattens out at about 3500+rpms. my brothers 04 spec v puts up a fight from a roll! this is rediculous! i originally planned on doing mainly appearance mods to the car but i may have to do something about this first! how much can i gain with a off road x pipe and a tune? the only mods i have are a volant intake and borla catback.

Hey bud i had the same problem once get high flow cats or cut them out completely

 

[jibloni]

also you need to cut down your injectors to a 24 lb. Even with the mods you hqave on it the engine wont support those big injectors. Basically your engine is getting all that gas but it dosent have the ass to burn it all, you are runnig way to rich and that has been known to cause your cats to go to .

 

[jibloni]

Off hand i dont know what thw codes are but i am going to assume the codes are going to read that your cats are bad.same as if you had removed them

Hey bud all these model cars you can delete your cats and then use the programer to delete the rear o2 sensors and it will run just fine. I did it to my 04 gt and and i gained 20HP to the ground on the dyno with no problems.

 

[Night Shifter]

Hey bud all these model cars you can delete your cats and then use the programer to delete the rear o2 sensors and it will run just fine. I did it to my 04 gt and and i gained 20HP to the ground on the dyno with no problems.

I know this..i mod/tune these cars on a daily basis...i know youre just providing helpful input so dont take this as me snapping back or being a jerk

Not to be a dick but there is no way you got a 20hp increase by just cutting out the cats..

 

[jibloni]

I know this..i mod/tune these cars on a daily basis...i know youre just providing helpful input so dont take this as me snapping back or being a jerk

Not to be a **** but there is no way you got a 20hp increase by just cutting out the cats..

well see thats what i thought too but when i cut my cats off and deleted the rear o2s i also had no mufflers. From 1 day i had put down on the dyno 363RWHP and the very next day early in the morning i cut the cats and such, went back to the dyno and put down 383RWHP. I cant explain it bud ii really cant. currently im in asscrackistan but as soon as we get home ill get the dyno sheets and post them.

 

[Night Shifter]

well see thats what i thought too but when i cut my cats off and deleted the rear o2s i also had no mufflers. From 1 day i had put down on the dyno 363RWHP and the very next day early in the morning i cut the cats and such, went back to the dyno and put down 383RWHP. I cant explain it bud ii really cant. currently im in asscrackistan but as soon as we get home ill get the dyno sheets and post them.

Lmao at asscrackistan hahaha

You obviously have some kind of power adder?

 

[jibloni]

yeah i forgot to mention i had a KB 2.1L sorry bout that

 

[N8Dogg98]

well see thats what i thought too but when i cut my cats off and deleted the rear o2s i also had no mufflers. From 1 day i had put down on the dyno 363RWHP and the very next day early in the morning i cut the cats and such, went back to the dyno and put down 383RWHP. I cant explain it bud ii really cant. currently im in asscrackistan but as soon as we get home ill get the dyno sheets and post them.

What are your mods.... pics?

 

[jibloni]

after i put the 14 PSI pull on my final numbers where 407RWHP and 512LBFT of torque @ above 6000ft elevation.

 

[jibloni]

N8dogg98,
I had a KB 2.1L, 42 PSI injectors, boosta pump, cold air of course, 255LPH ford focus fuel pump, deleted my CATs and rear o2 sensors, and deleted my PPRV. i think thats it bud.
like i said im in asscrackistan right now. no pictures

 

[trinity_gt]

N8dogg98,
I had a KB 2.1L, 42 PSI injectors, boosta pump, cold air of course, 255LPH ford focus fuel pump, deleted my CATs and rear o2 sensors, and deleted my PPRV. i think thats it bud.

Your numbers are pretty weird for a 14psi pull. Over 500 ft-lbs but "only" 400HP? And 14psi: What was done to the shortblock?

 

[jibloni]

the short block was stock. and that exactly what i said. KB nor the place that tuned me or another mustang expert could tell my why. Generic sea level numbers where 468RWHP and 566 LBFT.

 

[g96v6-250k]

if the op had got some bad gas somewhere that can or will clog some cat or partially freeze a valve. i would have looked for tight ex valves or excessive wear on cam lobes. i would also get injectors ultra-sonic cleaned flow measured if reused, just to be safe