SLP MAF was a power loss for me. I would ditch it and re-dyno.

 

Not all 98's dyno low.

My 98 with a lid and loudmouth dynoed 306rwhp.

And now it dynos much higher than that.

 

ngozer,

There alot of thing you could do to make your car have more power, but the torque converter and gears will hurt your numbers.

The flowmaster and the mac cats (which are worse than stock cats) are killing your hp, and the slp maf is a hit-or-miss thing mostly a miss.

Go with no cats and use a cutout and watch the numbers go 20-25 higher.

 

i just want to say i really appreciate all of y'alls posts. i'm definatly going to start with either gutting my cats or getting an ory, and getting rid/selling my slp maf and getting ported maf ends and a cutout. once i do the above i'm going to get my verter resatlled to around 4000-4400 and then i'm going to get tuned with ls1 edit. what i really dont understand id why or how i'm running with(actually beating by about a car langth) my friends who has an 02 z28 and dynoing 331hp and 345 tq with 3.73's from a roll. yeah i dont lanuch well at all. but dont get me wrong, i'm glad i do beat him but i hope y'all understand how it boggles my mind.

 

by the way, has anyone gutted the mac cats and how did it sound? also (and most importantly) how did it gain? or should i just go with an ory? thanx again.

 

ported maf ends can cause problem in a4's I ended up going with a stock maf because of the problems... do your self a favor and try stock ends...

You’re on the right track, cutout, and gutted cats. I would also look in to a hooker muffler; they sound really good and flow well to. I have a loudmouth and hooker LT’s very loud, if you like loud then the loudmouth is the way to go. Slp dual dual is also a good choice and is not very loud.

 

I wouldnt gut them just get an offroad and flange the int pipe to swap easily.

Also I picked up a TON of power going back to the stock MAF with screen removed. (Over 35RWHP midrange)

I dont have experience with the SLP MAF but I would try a stock MAF without screen and see how you dyno

 

Your numbers are exactly where they should be. You have stock internals, you're still running cats, and you're having to turn 4.10:1 gears! My '98 T/A AR dynoed 280 RWHP with just a cat-back exhaust. While you've added some parts that pick up power, the higher stall speed torque converter (even if it is a small one like the 2800) will show some HP loss on the dyno, and the 4.10's will eat some power up, too. The car easily has a 12 in it at a good track with some sticky tires. Gears and torque converters will disappoint you on the dyno but make you smile at the track.

Your friend's car dynos so much higher because it's a 2001-02 car, and it's a six-speed. My '02 SS A4 put down 25 RWHP more stock-for-stock vs. my '98 T/A A4. They changed camshafts, intake manifolds, cylinder head castings, and a few other things that make the '01-'02 cars stronger off of the lot. The six-speed transmission also does not absorb near as much power as a 4L60E transmission. It's perfectly normal to dyno less than a six-speed car. I only put down 315 RWHP with my '02 SS with all of the bolt-ons, but the car ran a best of 12.04 @ 111 MPH. Don't get too wrapped up in dyno numbers; the car will run great.

Trevor
Texas Speed & Performance

 

hmm i know what i'm going to do now. thank you all for the reply's they really helped me.