Nealoc187

iTrader: (23)

Since my last dyno at this same shop I have done the following changes:

JWT ECU with 7200RPM limiter
Megan Racing Catback exhaust
PR intake midpipe:

I put down 183-185whp @ 5900-6200rpm and 175 wtq between 4300 and 4800 rpm

I made over 150 ft lb from 1600rpm to 6300rpm. Power peaked at about 6000-6200 and tapered slowly to about 170whp at the 7200rpm rev limiter.

Last fall I put down 184whp and 172wtq on the same dyno. $1000 in mods gained me nothing. Sweet.

On the other hand I don't care that much, I don't race on a dyno like the single turbo supra guys do. I race on the track.

Unfortunately I wasn't able to compare the stock ECU and JWT ECU back to back because when the operator told me 185ish HP I thought something was wrong with my MEVI so I pulled the vac hose to the canister and made it so the MEVI was open the whole time on my second run. Turns out my MEVI was working fine. I only got to make 2 runs.

The only possible explanation I can come up with is that my larger brake rotors (8lbs heavier per side) are sapping some power. Or my motor is getting weak with age. I'll post up the scans when I get a chance and more detailed analysis.

nismology

iTrader: (8)

What kind of intake were you running with when you dynoed before??

Nealoc187

iTrader: (23)

Same intake stock resonator.

Nealoc187

iTrader: (23)

Oh I also have it on video in case anyone wants to hear a maxima with a really loud exhaust hit 7200rpm.

Street Reeper

Are you going to try it again with the resonator back on?

How where your hp curves, did they improve or drop off in any area's when comparing them to last years?

dmontzsta

Funny how I blame my bad times on a 270k motor and people say it is excuses

My motor has spirts it is FAST AS HELL every once in a while.

I30tMikeD

iTrader: (8)

does not make a whole lot sense that you have made substantial gains at the track but not on the dyno. Did you double check for any ghost codes like a knock sensor and make sure the car was running right?

gtr_rider

iTrader: (50)

Can I hear, AIM

Nealoc187

iTrader: (23)

Someone else has it on their camera. I have to wait for them to post it or email it to me.

As far as the codes, no I havent checked codes in months. But I can tell you it wasn't knock, the graph was perfectly smooth before any artificial smoothing was applied by the WinPEP software. If it were knock the graph would be all over the place.

The car feels like its making great power. Doesn't feel any different than it did a few weeks ago at the track when I ran 14.1 full interior, street tires. Weird.

Dave B

I think that this definately proves that every dyno reads a little different.

I haven't dynoed with my JWT ECU, but before that, my Max with an HKS hybrid intake, UDP, non-mandrel y-pipe, MEVI, and Stillen non-resonated B-pipe made 189fwhp and 186fwtq with 180+fwtq made from 4300-4800rpms and 187+fwhp from 5900-6200rpms. Peak power occured at 6200rpms. The thing is when I ran at the track and got my 14.4@99mph, I had the stock B-pipe on and a hacked stock airbox.

I don't think I'd get too caught up in the numbers because your car has never been a dyno-queen, but it's proved itself on the track. I'd concentrate on the what was gained in the midrange because that's where most see the gains. As most of us know, the real 1/4 mile gains of the JWT ECU come from the extended redline.


Dave

nismos14

iTrader: (56)

o0oo i wanna hear it :-D lol thats so odd about the power difference.... mevi? motor? who knows? are u gonna try to figure it out or juts live with it the way it is?

mAdD MAX

Well you did gain power in the extra rev range till 7200RPM, thats more power under the curve that you did not have before. Can't be a bad thing!

Mishmosh

iTrader: (3)

Hmmm... I thought for sure you were going to say that the midpipe (vs. stock resonator) took away any gains the JWT ECU might have given.

happyricefob

iTrader: (7)

i know this may not seem significant. but have u gain any HP from ur megan catback? i know u had fitment issues, and it was only 2.25 inlet rather than 2.5. megan is new to the maxima aftermarket with no dyno proof to its catback system. maybe there is leakage durin welding? maybe the catback doesn't provide maximum flow like its suppose to? maybe it's jus a ghetto catback after all?

sorrie no flame. jus adding ideas

Bags

iTrader: (3)

I have been thinking about the JWT ecu and a 7000 red line.

I would like to see the graph.

Maybe our motors are not setup to run @ 7200 .. I.E. cams e

Dave B

Neal-

I was over at ClubSi and a guy posted about the numbers his car put down on the same machine as your. He even mentions your Maxima and it's numbers. That machine reads REALLY low because he said a stock BMW M-Coupe made 210rwhp, Audi TT with chip made 165fwhp, and a SC TL-S made 240fwhp. All those numbers seem about 15-25whp lower than usual.

Dave

xHypex

iTrader: (1)

If you're trying to compare dynos don't. Neal: Were your dyno runs done in different seasons? IMHO the correction factors don't do your car justice because they're so conservative. My December dyno in 40 degree weather had almost the same correction factor as my 140 degree, high humidity dyno this summer.

http://www.turbomagazine.com/tech/0306tur_dynodash
-hype

SR20DEN

iTrader: (7)

Good ole JWT and their +0hp ECU programs.

Dave B

Requin6 saw a pretty decent gain with his JWT ecu. Neal's case is a bit odd. I plan on dynoing my Max with the JWT ECU, but I'm waiting till it's cooler because that's the only time I dyno my car.


Dave

96shogunmax

iTrader: (9)

My MEVI will be here next week. I hope the JWT/ECU in my car is going to take full effect with the added pep.

Iilac

iTrader: (65)

I haven't not dyno yet with my jwt which has the 7000 rpm redline but I sure felt a difference when I drove it the first time with the jwt. I hope to dyno soon in the fall when the weather is cooler.

IceY2K1

iTrader: (3)

I think the JWT is worth every penny just for the 7000-7200rpm redline WITH a MEVI. I'd plunk down the $$$ right now for one.

BTW, WHERE IS THE GRAPH? I think the old saying, "a picture is worth a thousand words", coudn't be more accurate right now.

Y2KSESteve

iTrader: (22)