MaxedOutSS99

So i got my car Dynoed today. And as you can see the tittle says i got max 254hp. Check the sig for mods. These are shamefull numbers. The guy at MMS (sorry don't know his name) said it could be one of many things. Clogged cats. Need new plugs and wires. Bad timing. What do you guys think? Just for a little more info on my car it has 60,000+ miles on it. I feel really embarrased about this.

Slowhawk

iTrader: (12)

Did you A-tap the car??Timing could be in low octain table?I would check that first then gut the cats.

MaxedOutSS99

No i didn't A-tap it. Where should the timing be?

theblur98ss

iTrader: (71)

Definately do some checking. You're 100 hp low. A set of heads and headers would sure wake it up though.

MaxedOutSS99

I have predator and im pretty sure i can adjust the timing with that. what should I look for and what should it be?

gator's 99TA

iTrader: (2)

check plugs, is it idling really rough? timing should be around 24 degrees to make good power. also it might sound silly, but did you dyno in 3rd gear? 2nd would show about that much power.

MaxedOutSS99

yea, I wasn't behind the wheel but the guy that was i know for sure he was getting it to 3rd.

soundengineer

iTrader: (16)

3rd??? it should be in 4th...

NA$TY-TA

iTrader: (21)

3rd gear in an auto, 4th in a M6.
Thats way low. like someone above said 100hp or so.

Fierce-LS1

iTrader: (3)

Don't feel bad bro. I was at MMS too this morning and I dynoed 308HP. Something is definately not right since I run about 12.8 in the 1/4 mile (sea-level). My numbers didn't make sense either. If you think your car is running strong, don't worry about it. It's really the track times that count.

Gev

I was looking at your mods and didn't notice any aftermarket exhaust in there?

With the cam and all the other mods you should pick up a considerable amount. Change your plugs and wires. Check for misfires. If you need an A-Tap log done, let me know and I can do it for you if you bring your own laptop (sister is using mine for school now).

Oh and one more thing, did you have a full tank of gas? If you were low on gas, the computer pulls timing. Just a thought.

MaxedOutSS99

I have stock exhaust. Im going to do a wire and plug change. It was time to change them anyways. And im still running the stock cats. and my car has 60,000+ miles on it so im sure my cats are done. After that i will pull another dyno session and hopefully my hp gets better. And i had about 3/4 in the tank. But yea its like 100 hp low. Would bad plugs, wires and cats do that to ya?

Bowtieman4life

iTrader: (1)

Something isvery wrong. Listen to the guys above and ATAP that thing. Also, did you have the dyno guy do an A/F ratio test. It would of been very helpful.

Good Luck

Trojan T/A

iTrader: (1)

MaxedOut, I'm sorry things didnt work out today, but definitely check the timing, change plugs and wires, Autotap the car, and get a compression check. Then look into the cat problem.

BTW, did you buy the SS used? I thought your car was too loud for a stock exhaust and I noticed as you were driving off why your car was so loud ... I think you have an 80 series flowmaster muffler in place of the stocker.

NOTFAST

iTrader: (10)

the people at MMS couldnt help you with the problem?

NIRVANA

Well, before you tear apart your cats and replace a bunch of parts, do you know what you're running in the 1/4? If you're in the 12's (which you probably should be with your mods) then there's something wrong with their dyno. Perhaps it needs to be calibrated (forgive me if this is the wrong term as I'm no dyno expert) or something. Do you know anyone else that's used this dyno recently and have they also shown low numbers? I would think for sure that if your missing about 1/3 of the HP you should have that you would DEFINITELY notice it while driving...i.e. it would drive like **** and you would know something's wrong.

99MONGOOSE

Try a different dyno. I have heard of some shops purposely low dynoing non-customer cars so that the customer will spend some cash there to rectify the problem. I am not saying this is whats happening but I would at least eliminate the possibilty. If you are definetly that low I would first removing the predator tuning then re-dyno. Remove all possible variants(mods) and get it as close to stock as possible. Could be a faulty MAF or bad injectors, need a quality tune-up. There is a possibilty that the cam needs a quality tune NOT a hand held tuner too. Good luck.

O2BQIK

It wouldn't be the whole problem, but I had that muffler on my '99 SS with heads and cam. Thru the exhaust it only made 363 rwhp, but when we opened the cutout, it made 393. I changed to an SLP dual/dual muffler, left everything else the same, and then only lost 7 rwhp by going thru the muffler. If I were you I'd try a cutout to see if that muffler is costing you power, or else a different muffler altogether.

B-MAN

make sure that you are not loosing compression and that all your cylinders are firing properly

Trojan T/A

iTrader: (1)

02BQIK, I wasnt saying the muffler was a problem as it wouldn't be, I was just trying to let him know that he had an extra part that he didnt know about before.

Also, this dyno was done at a dyno day where most cars saw the same numbers or expected increases from the lasty dyno day in Feb. He was the last car to dyno, and I dont think the dyno stopped functioning properly for that run.