i lost alot of power ,went to nissan and they said nothing is wrong no codes. later i had the car dynoed at 181hp- 208ft-ibs i'm going to change the plugs next. anybody have an idea whats wrong?

 

well tell them to **** off, cause your around 30-40hp lower than you should be dynoing at... Could a MAF be going bad?

 

If you get a dip and a surge at 3800 rpm then that's your VIAS. Overall your numbers look low, though. Sounds like your VIAS is working. Hmmm, yeah, maybe plugs.

 

i'm going to try changing the oil filer too.]

 

that's a bigger dip in hp than I took when my '02 ran into problems. I dynoed 195hp 211lb/ft awhile back, and despite my dyno guy swearing up and down it was ignition problems, I found it to be VIAS issues. Try disconnecting your VIAS and see how it runs like that. If there's no difference, that might be your problem..

 

What're the mods? They may assist in tracking down the problems as well.

Throwing on a set of 40lb 22"s would probably lower your dyno quite significantly, and things like an intake will increase your probability of a MAF going bad.

 

2002 6 speed: franken intake, warspeed y-pipe , high flow cat,b-pipe, ur pulley,cross drilled rotors, matrix brake pads, tokico shocks ,braided brake lines ,18" Mille Miglia Evos, sumitomo htr tires, i'm using the 2001 maf.

 

2001 MAF?

As a sidenote, did you dyno with a group of people who didn't notice a drop in power from usual?

 

Wow. That's a pantload of mods, I hadn't even been paying attention to the y-pipe situation for 2002's. I think the Mille's are heavy but not THAT heavy. Your car is seriously goofed.

I might be inclined with Jer's theory, however if you thought your car lost enough power to go to a dyno to begin with ... It's probably not the case. In my MAF problem experience, my car was jumpy and threw codes left-right-and-center, so I'm going to say it's not that. I'm going to go with SteVTEC on this one and do some experimentation with the VIAS. Changing your plugs is a good idea, ESPECIALLY if someone put bosch ones or something in.

Other than that, all I can suggest is doing all the maitenance on it, but it looks like you're already going on that idea.

 

i dyoned at 216/219 with a franken car and a HKS muffler can. with 40,000 mile old factory plugs...on a 2k1 MAF. sooo.....i'll throw that into the mix for you guys. My plugs even went through 3 maf failures which caused super lean/ super rich conditions.

 

Why are you using a 2001 MAF again?

 

Because they dont BLOW up from intakes like the peaces of crap 2k2 MAFS.

 

I dynoed 215 hp with my 19 inch Milles...........and Im auto !

 

i dynoed @ 210Hp and 221 TQ with JWT popcharger and cattman muffler

 

hey man that really sucks.....but at least ill keep up with u next time we go 130 down the parkway!!!!

 

My 4th gen dyno'd 181whp.

 

here 's an update. after 4 months and 4 dealers found out one of the problems was multiple cylinder misfire so i had the coils ,spark plugs , injectors and throttle body replaced and cleaned and now i dyno 188hp at 4800rpm and 226tq .

 

Well atleast you gained some torque back. But still your hp shouldn't be even close to 190. That is seriously messed up. Hope you straighten this out. Good luck
Alin

 

That is Crap.

Seriously, I would demand a new engine if they can't figure out what's wrong

 

what should a stock '02 6sp be doing?

 

so,whats the update??

Did u check your VIAS??

 

~205fwhp/220fwtq