Whats up guys, I just got back from the dyno and to say the least.. I am very dissapointed. My max HP incresed is a whopping 5.0{176.7} HP and my max TQ increased 2.7{182.1} HP! Whoopdey do..

The biggest difference in HP was at 5650 RPM, I gained 9.1 HP there and 8.5 TQ.

This is not what I hoped for by any stretch of the amagination. The car does hold it's power a bit further now to a about 5800 RPM. I lost about 1 HP and 1 TQ up to 4000 RPM, at that point I slowly gained HP starting at 1 HP and continuing up to almost 10 HP by 5800 RPM.


Now what I am wondering is, is this worse then just a Y-Pipe? Does anyone have a dyno of a Y-Pipe before and after, what are the real gains?

This experience is a big turn off to spending large amounts of money on a car and not gaining hardly anything.. It looks like I am going to have to join the SMC club .

Well share your thoughts. BTW I will get the sheets scand on Sunday.

 

Are these corrected #'s? I know you said it was freakin' hot the other day.... Maybe try again when it's cooler?

 

Do you have Y pipe? I bet a freer flowing exhaust would help the headers along.

 

The Y pipe was part of the header design. Hmm, maybe its more worth it for those that still have the stock Y. Wanna trade?

 

not good to hear.

 

that just outright blows. It sucks you had to be the first one to try it,(spend all this money, long distance calls, etc) but at least you've helped out a lot of members on this forum. I dont see many, if any people getting this. We were all hoping for big gains, but for $600 bucks w/out installation it just aint worth it.
Consider yourself a brave hero. By you doing this, you saved me money.

 

Either way E, thanks for bucking up and taking the plunge. It costs $$ for the headers + shipping + install + dyno.

Even though you spent alot of $$, you no doubt saved alot of 4-geners money by the information.

Some should set up a fund for this guy for being the test pilot here. $1 or $2 from all the 4-gen guys would at least help this guy some.

This seems to go hand in hand with Don's ported stock exhaust manifold information. Maybe there isn't alot of hp to be made by headers on the VQ? At least not w/ the stock cams anyway.

 

The headers include a Y-Pipe. My 95 max with 98K miles has a Stillen Intake,PPC headers/Y-Pipe, RT cat, Stillen Cat-Back exaust and a Stillen Flywheel. The car is however in seriuos need of a good tune up.

Randy, the temperature today was 77 degrees and the temperature of my Baseline test last week was 81.8 F. These #'s are SAE corrected. I am not going to dyno the car again until I have my GForce ECU,tunup and UDP. These damn tests are $120 a pop!

 

Oh yeah, I forgot. eek. I think a redyno is a good idea.

 

that just plane sucks a$$

 

Do you have Paypal? I'll kick in a few bucks for this experiment. I give you a ton of credit for taking a big risk.

 

Thanks for the very kind gesture Jeff but don't sweet it, I can always make more money.

How much HP is usually gained with a Y-Pipe? I meen real HP #'s from a before and after dyno test? I have never actualy seen one before.

I wonder if I waited another week if the ECU whould adjust more or something? I have had these headers on for 3 day's and 200 miles.

 

Well from what I see, the Y gains the 4-geners about 10hp and 10-15ftlbs torque more or less. About what you are seeing. I would have to say 200miles is plenty of time for any changes to take effect.

 

(1) YOU will most likely continue to be the ONLY one on the .org with headers!! (dont you feel special!)

(2) Y-pipes will NOT become obsolete & will remain a top bang-for-buck mod.

(3) I can still get decent money for my y-pipe if I decide to sell it.

Oh, BTW, I feel your pain bro...
I spent $4000 on a S/C kit that was a P.O.S. and only dropped 1 second off my E.T. (hope Kev has better luck with it than I did)

 

Without reading back through all of the thread(s), would a different y-pipe make a difference as opposed to using theirs? I think it was stated some o2 sensors were positioned differently.

 

His orginal dyno was with a ypipe. It increased from that. And personally I think that is excellent results. So basically 18~ hp for a header. Sounds very realistic.

 

Your fault for running 19's!!!


Sorry to hear about your gains (or no gains). You have my respect for being the first to try this mod.

 

I wish that was true Russ. I had a stock Y-Pipe on my baseline test.

MY4DSC, I am glad I made you happy! haha. I also bought and sold a SC so I feel your pain.



After looking at my dyno in 4th gear I actually gained 6.4 peak HP{173.1}. Thats a little better.

 

emax: First of all, thanks a bunch for going to all the trouble and expending your effort on trying out these headers. You did a great service to all of the people here. It's too bad that you didn't get the results we were all hoping for. But I guess thats the way things go.... Thanks man!

 

When will us 4th Gen owners see the light? I was going to get the headers too.

E-Money, You aught to send that company your dyno test and get them for false advertisment. Just kidding.

I really think you should send them a copy of your results though.

When will we get a break?

 

When the G35 is 3 years old .
I will let PPC know the results.

 

Cool.

 

This is kind on what I expected all along. It looks as if the Nissan manifolds, while ugly, aren't too restrictive. The gains are right on with the gains from a y-pipe. I have never seen just a Y-pipe add 10hp and 10-15tq like some say. A Y-pipe WITH an intake will post those kind of numbers.

No worries Ethan. When you get more mods, the headers should help slightly more than just the manifolds. Not all car respond great to headers. The LS1 doesn't make, but more than 4 rwhp with shorty aftermarket headers and that's a big 5.7 liter. Sometimes the maker gets it right. Unfortunately you rid of your SC which would have loved those headers.


Dave

 

I'm just waiting for Don to yell out I told you so. In any case, even if it didn't produce anything I'd like to that Ethan for doing research into this and taking a chance on it. Who knows, if you ever decide to buy another supercharger it may come in handy.

 

Oh damn, then those results suck.

 

Hmmm, my friend Carlos dynoed 324 before headers and ypipe and then went to 356 with headers and ypipe. I think they worked more than 4 hp

 

Nope, I'm not gonna do it.

The only point I tried to make on the original header deal I tried to put together was that even though I made the OEM manifolds flow 300% better than stock, there was a 1hp gain (barely).

If you look at the design of the header set, its not that much different (flow) than the setup with a y-pipe. It looks like it would be better flowing, but I still stand behind my theory of a S/C'd car benefiting greater (because of the forced induction) than a N/A car, simply because I don't think you can get any more volume thru the engine (heads, intake, etc).

It may still be theory (until September), but I bet you'd see a better gain on a S/C car.

Good job on the progress though, it takes a lot of pain and suffering to find out the right combinations.

 

Don, get rid of that sig pic! It's hideous! I'm sure that we all don't want to see Kev's pic up again.

 

doh!

 

Why should this be a surprise? Don had his stock manifolds ported and they only made 1 hp difference. The stock manifold already flows more than the head does. The head needs to be opened a lot more before headers make a difference.

 

isn't that guy an rich actor or somethin from hong kong? no way is kev that rich , he drives a MAXIMA

 

Do I make you..... horney?

 

Ok, where't that puke smile?


Btw, we need more smilies!

 

Im sorry to hear teh #'s Ethan. Well your the only guy i knwo who has headers on a max... well to all max owners your the only one. hehe.

Atom-that was pretty bad that it only took 1 sec off considering a 50 shot took a full sec off. I told you to drop the damn 19 inchers. Doh!

 

Thanks, emax95, for doing this for all of us. Your efforts are very appreciated.

I curious about the sound you said the headers made like a motor bike. Do you think you have some kind of exhaust leak from the header flanges? Was there a gasket for the install? This could contribute to the poor results. Just curious of what you think.

 

You said a mouthful there, Don. After two intake setups and four exhaust setups, I couldn't agree more. And damn if I'm not back to running some stock components on both my intake and exhaust to get decent performance throughout the rpm range. Guess those Nissan Engineers actually knew what they were doing.

 

This is actually a good idea and I will investigate it tomarrow. The sound I believe I am hearing is a beez in the can flex section. If there was indeed a exaust leak it whould blend it easaly with this sound. The sound does decrease a bit when the car warms up but the same went for my old Stillen Y-Pipe. New gaskets came with the headers and were installed. I sure hope I have a BIG exaust leak, that whould make my day! Thanks

 

But look at what Don just said about the headers not doing much unless you have an SC.
In his own testing, he removed 1 pound of material from the stock headers and only gained .5 HP when dynoed.

Even Ethan's test shows that you don't get big gains unless you replace the stock headers with these.

Nissan did their homework on the VQ.

 

Now, this test was on a 95 who already had intake and exhaust work and a flywheel... So this car is flowing pretty well for a 95, even if it is in bad need of a tuneup (which might affect performance). Now, even with all these mods, he's putting down 173 fwhp. That's about what a 5th gen auto puts down stock, so my question is, would these headers see more gain of a 5th gen? And, are they more beneficial for4 such than just a ypipe? And, if they're not - is this a result of the build and design by the company who makes these headers? are they optimized length and diameter? etc. etc. I think we need more questions than just they suck...

BTW, emax, youn are my hero, you got big brass ones for going all out and getting them and testing them for everyone. Mad props!

 

Thanks dude. The PPC headers are 2.5' diam. and have a equal length designe. BTW I don't think a stock auto 5th gen put's down 173 stock, I remember Kev's modded {NA} max only put down 172HP. Either way..