Gauging Interest: 2.5 liter headers

[Altima1992]

means fuk my life**UPdates?!?!?!?!

[brokendan]

oh ha. roger that. doooooooooodddddddddddddddddd agreed. update. i want to buy this when my mr2 gets out o fthe shop lol.

[crayzitalian3]

I was able to talk to Kyle about the Headers and this is the info I got.

Quote »Actually we were finally able to install a set of headers last week onto a car. It will be driving around for about 1,000 miles and then we’ll know whether or not our solution to the check engine light worked. [/quote]Quote »We are looking at a release date of early summer if the header passes testing.[/quote]Quote »You can tell the guys on NICO, just make sure they know that the testing is currently underway and that nothing is set in stone yet.[/quote]

[opekone_1988]

Superb!!! finally some progress.

[dldjros69]

I was able to talk to Kyle about the Headers and this is the info I got.

Ill take it, hopefully everything goes well...

[JDRosenberg07]

I was thinking about it and id buy with the light now with that triple gt tuner from bully dog, you could just go in and delete the code and turn it off yourself.

[dldjros69]

I was thinking about it and id buy with the light now with that triple gt tuner from bully dog, you could just go in and delete the code and turn it off yourself.

When you say delete the code, do you mean delete it for ever. Or every time the code gets thrown you have to delete it?

[JDRosenberg07]

im guessing every time it gets thrown but i dont know for sure.

[Stumpjumper]

I'll try to pick up a header if the code gets fixed...a CEL just annoys the heck out of me.

[brokendan]

the vast majority the 07 qr25 sentras are getting the cel before 200 miles.. so they will prolly know soon if its resolved. im tempted for it with the cel even.

[JDRosenberg07]

especially since there are ways to remove the CEL now

[ESP]

Yeah, if they've got the CEL issues fixed I'm down for this within a year (depending, of course, on the general economic situation at that time...)

[Datalux]

Well guys,

I'm currently sitting at about 575 miles and NO CEL/SES light yet (fingers crossed). I'm guessing the gains are in the neighborhood of 12-15HP but Stillen will need to dyno on a 6MT because I have a CVT. I have the Nismo exhaust and K&N intake so YMMV. The header definitely increases the in cabin db so you need to turn up the stereo.

Base= 123HP (http://www.kandn.com/dynocharts/69-7061_dyno.pdf)Intake = +6HPExhaust ~ +7HPHeader ~ +12HP (guesstimate)--------------------Net HP ~ 148HP

One thing to note is that my car has never been to a Nissan dealer for any mods or adjustments. I know there was a emissions recall about a year ago that I have not performed because I heard people complain they lost HP. This should probably be investigated to see if previously tested vehicles had this adjustment performed and whether this might affect the CEL.
Modified by Datalux at 2:39 PM 3/22/2009

[dldjros69]

Again Datalux, didnt you get the k&n intake also.

So jealous

The only problem that i have is the k&n dyno wheel hp read out.175*x=123

x=30% loss

Is my math incorrect, that seems like way 2 much.

How about your impressions, buttdyno - does it feel faster?

[crayzitalian3]

how does it sound datalux, is it loud and annoying or does it actually sound good?

[Datalux]

Again Datalux, didn't you get the k&n intake also.So jealous

The only problem that i have is the k&n dyno wheel hp read out.175*x=123

x=30% loss

Is my math incorrect, that seems like way 2 much.

How about your impressions, buttdyno - does it feel faster?

K&N intake - yes, I think I noted that.

I'm just going by the K&N chart as I have no idea what others have seen for the 2.5L on the dyno. I trust K&N's dyno numbers because I see how the testing is done on a regular basis and they post conservative numbers. The Injen numbers are 10HP (133HP) higher, but they dyno'ed a CVT which I understand is unreliable on a dyno. Perhaps Kyle or Josh can jump in with the numbers they have seen on a 2.5L 6MT for comparison.

Butt Dyno = You can definitely feel the difference (2 Si's and 1 TC can definitely see the difference. I didn't beat the Sentra SE-R but I never lost eye contact either. (accept when he had to shift)

The sound is very good (comparable to a v6 to some) but the Nismo exhaust is louder than the Stillen exhaust from what I have witnessed (Ramon) and the addition of the header certainly increases the volume to an almost annoying lever under load. At cruise, it's not bad at all but from a stop it's a grind climbing to 3k in city traffic. I wouldn't want to take the wife, kids and luggage to Flagstaff,AZ in it. I thought there would be a loss on the bottom end but if there is, it's hard to see/feel the difference.

[crayzitalian3]

if you had to compare it to an exhaust set up on youtube, which would you pic, as in find a link that has a similar sound to it lol, sorry if im being annoying i just like to know a lot before i buy something.

[dldjros69]

No i ment didnt you prototype the k&n? This would be 2 prototypes now.

Se-r - 3051a/c - 3076

So it was a head to head race? i wonder if he had any mods, you should have been able to beat him with your current setup.

whoops i see you have a cvt sedan - 3179

My question is why is the drivetrain loss 30% or did they dyno your cvt at k&n?

[JDRosenberg07]

This is interesting... i didnt really think about the fact that it would be louder with the header. My car is already loud as hell under load with my artisan setup.

[Datalux]

No i ment didnt you prototype the k&n? This would be 2 prototypes now.--------------------------------------My question is why is the drivetrain loss 30% or did they dyno your cvt at k&n?

Actually this is my 3rd prototype - The Stillen Facia, K&N INtake and now the Stillen Header but who's counting.

The K&N dyno chart says they dynoed a 2.5L 6MT in 2nd gear. Also note that the California version is 5HP less then everyone else due to emission stuff.

From Wikipedia:Stated versus observed power

'In addition to the physical problems suffered by the QR25DE, Nissan's official stated power and torque numbers seem to disconnect from power measurements taken by the general public. Though rated for 175 hp (130 kW) and 180 ft·lbf (240 N·m) of torque in the Nissan Altima and Sentra SE-R Spec-V, the actual power of the engine may be significantly lower. Multiple dynamometer readings performed by a range of people in an assortment of cars over several years have shown that the engine more than likely produces ~160 hp and ~170 ft·lbf of torque. Parasitic loss alone seems an unlikely candidate for the discrepancy as automatic transmission loss would be approximately 28% and manual transmission loss 19%.[10][11]

However, engine dyno tests performed by Brian Crower, a respected aftermarket parts supplier, shows this engine does indeed perform very close to the advertised numbers. The high weight of the Helical Limited Slip differential which is in many models with this engine, and the very heavy dual mass flywheel likely account for the losses on traditional chassis dynos."

I would love to see some more 2.5L 6MT dyno numbers for comparison.

I'll try to get a few sound bytes posted in the next couple of days.

[crayzitalian3]

I'll try to get a few sound bytes posted in the next couple of days.

nice i can't wait for these man!!!! do some revs, in cabin, out cabin..the works lol...please oh please!!!

[Stumpjumper]

one day if I can find a place cheap enough I'll get my ride dyno'd.

[kyle@stillen]

Datalux-

I think it is best if we don't do any sound clips at this point as the headers you have are very early prototypes and the final design will be completely different. I don't know if these differences will have any impact on the final sound of the production headers but I don't want to either get someone excited or turn someone off with a part that is not the final production piece.

Thanks!

[JDRosenberg07]

one day if I can find a place cheap enough I'll get my ride dyno'd.

I know your in Georgia but i found a place in central fl that does 2 readouts for $50. Im sure theres a place in GA somewhere for that cheap.

Im gonna have mine done sooner or later i just dont have the time right now.

[brokendan]

ok so did you ever get a cel?

[noshift]

awsome update! the best thing about it is, stillen is testing on a sedan so there wont be any fitment issues with the sedans. although i dont even know if there is actually any difference in the two engine bays.

[mikegtr06]

i was hoping that i could get it before i left for germany.

[psi101101]

when is it coming out?? i might keep my AC for my ma..haha, she loves the racing stuff

[mikegtr06]

bump

[2008AltiCoupeDan]

cmon guuyyssssssssssss whats going onnnn??

update pls~!