Does anyone with a 5at notice any power gains from these mods?
I have stillen ground wires, jwt intake/ z-tube, stillen gen 2 exhaust, and the skunk2 spacer.
Ive reset the ecu, as well.
I notice no gains from stock...

 

^^ what he said

 

Go to a quarter mile track and run factory and see what ur quarter mile iz and then throw on ur aftermarket mods and run quarter mile again and u can compare ur quarter miles time by the slips.

 

get rid of that spacer and get MD 5/16 spacer and some pullys...

 

yeah, i agree that the only definite answer is for the dyno. driving may help or worsen his results not to mention his pocket. u may drive top knotch on the stock but have a weak run (maybe late launch or something) the second time.

 

A dyno is not any more reliable than the drag strip. A dyno uses a correction factor to compensate for atmospheric conditions and you can employee a similar correction factor for drag racing. Elasped time can vary wildly depending on 60 foot, but MPH will be consistent, especially with a 5AT car. My MPH rarely varies more than a 0.5mph between runs, but my ET can vary by as much as 0.3 seconds due to 60 foot differences. MPH is the indicator of available HP. If you trap speed increases, your car is making more power.

Two important things though when testing on the strip and also the dyno:

1) Run at the same track or dyno.

2) Run under similiar conditions (i.e. within 10 to 20 degrees). Running in 50 degree weather vs 90 degree is too much of a difference and variables within the correction factors gets skewed.

 

That big spacer might be moving your hp/torque curves too far up the rpm range to really notice. But I would have thought those mods should give you a hp increase that you should have been able to notice.

 

lets see

1. you can lose hp because you have a intake and drawing in more air and letting too much air out from da exhaust. besides it a sedan. u shouldnt mod it

 

You're right, we should all de-mod our cars, sell the parts and give you the money to fix up your heavier coupe.

 

For the OP, you can try the MD 5/16" spacer as opposed to the Skunk one where there are reported incidences of intake leaakage

 

I have a ztube, popcharger & skunk2 spacer on a 5at 05' sedan.

When I installed the ztube & popcharger after several weeks my thoughts were 90% noise & 10% power on a good day.

After the 5/8ths skunk spacer with zero leaks verified with saline solution & dishwashing liquid- The idle smoothed out, the power band is more spread out accross the tac and not it's so "jumpy" at lower rpms(you know, barely pressing the pedal and the car lurches forward more than you expected), but it's not a damn bit faster getting to 60 or 100mph. In fact I think it's slower. Lets face it, life doest allow the tac to stay between 5200 & 7000 where it "suposedly" makes HP. If the VQ had the valve lift, valve size or "bore" to utilize a plenum that large it would be a monster, fact is it's about maxed out with the factory plenum, 5/16ths is the max I would go. 1/2 & 5.8ths in my opinion are 100% hype, dyno numbers and all, smoke & mirrors to to take money from us idiots who pay though the nose for a few extra HP. My Skunk2 is coming off and going to ebay...........or if anyone wants it it's $180 shipped.

 

Being the proud owner of a heavier coupe I've made some the the same mods
that you did but with Stillen CAI/ZTube..MD .50" Spacer..Fuji Y..Magnaflow
catback..Grounding Wires. I gota tell you my coupe flys and it's a kick in
the a$$ to drive. I don't know what your problem is but maybe you should
demod and sell your sedan......doesn't sound like you're having fun!

 

The car was fun before the mods, as was yours. What do you have in it, an extra $4-6,000 in mods? Or did you pay to have them done and have more than that in it? I don't need my car sounding like a flipped breather on a rochester quadrajet on a chevy smallblock(which also did nothing but make noise) to make it anymore fun to drive. If I do an exhaust at all it will be a custom bent & magnaflow muffler, the off the shelfs are WAY to expensive for a few ponies(if that). Hype sells it all and no one has actually challenged the dyno results that are posted everywhere. I'm an Electrical Engineer, was an aviation electronics technician in the Navy for 21 years, and am currently self employed designing & building Tube Guitar amps(www.collinsamps.com, MORE HYPE in that industry than here), and can say with 100% certainty that the entire grounding fiasco is a HUGE scam. Anything that "seems" better after installation is absolutely in your head.

 

What happens when the factory engineers get seriously motivated by the Marketing Department to win Magazine tests. Squeeze an extra HP out and get a $100 bonus, as long as it doesn't fail until a little while after the warranty expires. So what if a few smoke and burn some oil.

Really makes the aftermarket work to attempt to find the things the engineers passed on as not reliable enough for general use. Or to just lie in their ads. After all who will sue them?

 

Get a tune... I went so lean at one point that my car became a slug... adjusted A/F and wham! It was there!!!

To all you "theorists" out there... it is possible that the A/F is fine with the few mods he has... but I've seen first hand how much of a difference it makes. There have been a bunch of posts like this in the past - and many times a proper tune has brought things up to snuff.

You really can’t add a bunch of breather mods and say “Where’s the power” unless you have the ECU understanding the new configuration…