Dyno queens own supras....j/k...no but really...OK

If you are truly unhappy with the car as a whole, that is what you should do, but many here have already told you how to hit that number if that is really what you want...Ditch the m370 and dyno in the winter, problem solved.

How many NA z's have even broken 13 in the 1/4? You did it before the headers and retune, running high 12's in a fun street car I think is more than acceptable...this car is not cheap to mod, I think we all know that, but parts can be bought and re sold...I buy as much as I can used as long as it is in good shape, that save a ton of cash. Between tuning and "HP" mods I bet I have 4000k or a tad more in the car(including purchase price of the car I would say 32k overall with all mods, and for that price point I cannot find another newer car I would rather drive, but that is me) and at 322 whp, but oh well thus is life, still most stock z's put down what 270-280 bone stock on a dyno jet? That is roughly at 40-50 hp gain....here comes the boost argument... Cheapest kit is stillen which nets just over 400 whp, is not to terribly reliable(and looks like hell, sorry it does), and do not forget about supporting boost mods that are needed, its not as cheap as people think, to boost these cars properly I estimated 10k with a gtm 1.5 sc kit and supporting mods, tuning etc, that's with me doing the labor...even at that point how many cars will put down over 500whp for just over 40k(in my case I paid 26.5 for the car)) and still have all the Z has to offer?

I have a friend and co work that has over 15k in his civic si, and it put don 221 whp and run 14's, he has as much in his car as I do mine, but he LOVES his car and is proud of his mods and hard work, that is what it is about.


I could go on, but it seems you are using this "failure" (which it is not) as an excuse to ditch the car. If you are unhappy with the car, by all means, do it, just don't buy a friggin mustang, so tired of seeing them, and no I do not care they are faster, and BTW I know a guy with a new 5.0 with intake, exhaust flash and is only running 12.6-12.8 consistently...

and finally, the Z is NOT A 1/4 MILE CAR, buy suspension parts and make it a street go cart, a good set of sways,coils and tires you have a darn good handling car.

72 degree night at the drag. Two runs both 13.1 at 106. Somehow 2600 bukcs and backwards in performance and I could feel 3rd not pulling quite as good. Thats what did it. Thats why im so pissed off.

the rattle is also quite loud now. it has to be related to something with the headers and test pipes, otherwise its a huge coincidence. don't even wanna drive it, like driving a crapper with that rattle, it's loud enough people turn their heads to see whos crappy car is making that noise. oh just me....

if the labor wasn't so expensive I would without hesitation have my original headers and HFC put back on the car and and be done with it but I'm not paying a grand just to revert, they just gonna have to fix whatever is wrong.


With the lsd and springs and swaybars it still retains being a nice track day car but thats the only chance I keep it. Imay just keep and czve in and send my 1997 z-28 to lingenfelter or whatever the shop name and have it built back to glory.

Sent from my GT-N8013 using Tapatalk 2

Sounds like its pulling the timing...Im no expert but me thinks you has a poor tune. If the rattle is a result of the install, I would be barking at those who put them on.

:iagree: and once you decide to run a tune, if your tuner isn't 100% proficient, a LOT of problems and oddities can be attributed to a not perfect tune

I hope that's the case because otherwise, this is pretty disappointing. I think everyone is hoping for at least 15-20whp after all this hype and it needs to not be CAI peak only whp. Where are all the dynos from recent people who ordered these with the DE HFCs or TPs? Would love to see before and after dynos on those if possible, not just peak numbers.

Here's my post to a reply in my own thread (I got genuine Momentum headers)
EDIT: My car is out of commission and will be for a good amount of time, so don't expect to see the dyno sheets in a week, but I hope at latest it'll be a month

Well, I will have a more realistic dyno.

I had "full bolt ons" before, Stillen G3 intake, Megan TPs, Stillen CBE, Stillen UD pulley, and no tune

NOW I'll have the Stillen G3 intake, Megan TPs, Stillen CBE, Stillen UD pulley, no tune, and the difference is only the wrapped Momentum headers, 99% of mods have decreasing returns, so lets see how good these things really are


And yeah, the collector is nice and polished, all the insides of the tubes are sanded too.

Can't wait to see your results since I think most people are in a similar boat with most bolt-ons already and are wanting to see what these headers will do a modded Z, not a stock one. Do you plan to get a tune as well? I just thought there would be more people with these by now since they seem to be the hot item right now. Surprised to not be seeing more reviews on them.

The only thing mine didnt have was tp or headers. The hfc were relaced with the de tps. Anyway....others, good luck.

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what's the difference between the Z1 and momentum headers? looks like they aren't living up to the hype

I don't think there is a difference. From what I've read, they're basically copies of the Momentum ones since Momentum went out of business.

If I recall correctly, Z1 bought the jigs to make these. Supposedly they have 2.5" tubing for the exit while the Momentums have 2.25" (stock for the DE motor)

I agree that there aren't that many reviews.
And no, I do not plan on getting a tune. We'll see what happens at the dyno, and fortunately my dyno shop is open 24/7 as long as you make an appointment. So I'll go on a day that is very similar in weather as to when I got ran my original dyno runs.

My graph is on page 23 of this thread, I did 322 whp and 272 tq(yest I rounded up) With the headers as stated before I was expecting 330, because the average non header z tunes in at around 315 as an average from what I have read on th forums. Vince(the tuner) told me they only see higher hp on cars with long tube headers, but my TQ was identical to the Z they pulled 341 whp out of and 272 tq, BUT that Z did not have the M370 which has been said over and over again to lose peak hp and gain tq. Also we do not know the temp when that Z was dynoed, they posted the video on august 1st, the temps were in the high 70's then, and it was raining almost all day when I dynoed- they like to tune in the morning, I was scheduled at 9 but was late due to the colossal rain store and Vince got tied up with and other car, he did not do the final pull till after 1 and it was up in the 80s at that point. If I ditch the M370 and re dyno and achieve 330 or higher, this proves the headers help. also we need some comparisons, who has some non header z graphs that are up rev tuned?

here is mine again:

http://www.the370z.com/members/joepr...-rt-tuning.jpg

And your not alone...read this thread.

How heat/humidity effects dyno results - Corvette Forum

ok, I also found this tool- Engine Tuning Calculator - using dew point

I imputed the dyno conditions for my 322 pull, and then the temps in march when it was 64 in the town where I was dynoed, it confirms I would have have about 4.4% more power on the 64 degree day I randomly picked... 322 now becomes (322*1.044) 336...

http://i609.photobucket.com/albums/t...psc1480ed9.png

http://i609.photobucket.com/albums/t...psd276f951.png

Z1 header on dyno 370z - YouTube

:tup:

stock 370z makes 207whp and 170qtq
Baseline without tune made 224whp and 190qtq
after tune: 245whp and 203wtq


i have made 235whp with greddy tic and berk hfc and k&n short ram intake... but that was close to October or November when its colder.
i will post dyno print out later