anyone installed these on an hr 350z yet?thinking of purchasing but would like some feedback before i bite the bullet

 

 

???ellaborate

 

I gained 18 hp. My butt dyno tells me so.

 

I just know that VERY soon a moderator will come in hear, and hammer you for the lack of "Search". There are TONS of threads about this type of thing. The people who have been here for a long time dont take kindly to posts without proper effort put in beforehand.

 

^ liar, you dont have the godsend HR

 

wow.just wanted a opinion from someone that may have used these.dont see why that would upset anyone

 

Nothing personal....its just that there are a wide variety of threads that you can search to find the info with out clogging up the site the same thing over and over. Just try the search function next time.

 

alright gotcha,new to this site

 

I can tell you, there is very little on the HKS drop ins and Hi Rev here. The good news is I just put some in to my Nismo Saturday and dyno'd it. The bad news is the numbers were inconclusive. Will post more when I get home. . .

 

thanx for the input nismoZ 840

 

You mean the hks foam filter. I saw a independent test that rated the hks foam filter the worst outta the lot for both HP and filtering. It was up against the blitz, k&n, and apexi. The Apexi and K&N did the best.

 

Injen has best gains for the HR.

/thread.

 

Taking HP gains out of the equation, the HKS is one of the worst filtering air filter on the market. It practically doesn't catch anything. Here is the review Word Sux is talking about.

http://www.mkiv.com/techarticles/filters_test/2/

 

Okay, apples to apples here. We are talking drop-ins and not new CAI intakes. A disclaimer, this is my armchair analysis and I only know enough to be dangerous. But follow my logic and I welcome people to poke holes in my logic without flaming please.

First the Filter comparison (which is an awesome analysis IMO) is from Revspeed Magazine, August 1999 (see bottom of page), is for CAIs, and for the Supra. Also the HKS was a wet filter back then. In 1999, "Livin' La Vida Loca" was a top 10 song. Needless to say, things may have changed a little since that time. Let's hope HKS and others have improved their filter material since then too. It would be GREAT to have this analysis repeated on modern products. (HINT HINT Tuner Mags and Performance Shops...)

It does look like the "Mega Flow" in the analysis has been changed to the "Super Mega Flow." Let's hope that doesn't mean even more crap is getting into the engine The CAI is using the triple density dry filter element (http://www.hksusa.com/products/more.asp?id=3190) that appears to be the same material used in their Super Hybrid drop-ins, just different configuration (cone vs panel). So there may be some correlations between CAI performance if someone has a good Injen, HKS, etc. analysis.

As to Injen having the best gains for the HR, I've head that too, but I've also heard the gains on HP are minimal (perhaps within the range of dyno error?) and the biggest improvement is sound. I don't have a source on that but have heard it enough it has stuck in my brain. Chime in if you have documented sources please. I've also heard that Injen is the only CAI on the HR who produced gains vs. losses against the stock dual intakes. The HR intakes are pretty damn efficient thus drop-ins could make a lot of $/HP sense for the High Rev.

Just so you don't think I'm an HKS rep, here are my dyno numbers on the HKS with some qualifications. First, the dyno results are crappy because there was a problem with the Dynojet picking up the tach signal (also a problem on a 2006 Rev Up that was there, is this common for Dynojets?) but I think enough of the pieces are there to make some hypothesizes.

Second, testing was done on a bone stock 2008 Nismo (unless you count stereo and window tint) with approximately 13k miles. Third, there was only one run with the stock filters (which were pretty dirty, probably original I'd guess) and second run with the new HKS Superhybrid filters. The HKS filters were installed between the two runs while on the dyno. I had hope to get two pulls on each, but didn't realize the tech only did one recorded run when he told me to put in the HKS filters.

Given the choppy and inconclusive results, I wasn't too disappointed not to have 4 pulls. FYI - this was a discount dyno day so my expectations were lower than a full price 3 pull typical dyno session. Also, this is my first time to dyno a car so chalk a little up to the Newb factor as well.

Here is the first run with STOCK filters:


Pretty ugly, eh? Here's one plotted against MPH which gives a better picture of HP, but not torque:



So, let's just say 262whp and 228wtq for stock 08 Nismo, with stock air filters.

Here is a slightly better dyno pull on the HKS filter:


So here we have 256whp and 232wtq. However the hp curve stops about 6200rpm thus probably hasn't hit the maximum. If you compare against the stock filter graph, it also is pretty darn close to 250hp at 6000RPM and peaks out at 262hp around 6500rpm. So, I think the hp curves would probably be about the same. Unfortunately there isn't enough information to readily compare torque values at a given RPM.

To make it easy to remember values, I'm going with 260whp and 230wtq, which seems to be in line with another Nismo results (http://www.350z- tech .com/forums/in...6&#entry547416 and https://my350z.com/forum/nismo-350z/...yne-gamma.html )

So, overall it's hard to say with any authority that the HKS performs significantly better than the stock filters with this data. Taken at face value, a +/- 5 hp or tq, you are talking about a 2% difference which probably doesn't exceed the %error for most dynos.

One factor that was offered was that since the HKS was dropped in and immediately pulled on the dyno, that the ECU wouldn't be optimized for the new "more theoretically efficient" filter. Does this seems plausible? Or is there no "optimization" period and the ECU and sensors just go about their business regardless? ECU reset necessary? New tune? Any other theories out there?

I'm still curious about if the extra $20 for HKS really does buy extra performance, but will have to wait for another set of dyno runs that hopefully provide more complete and conclusive data.

Sorry, no concrete answers, but a little more data on the topic.

Look forward to seeing other people's feedback and data...

Cheers!

A tasteful shot of the test subject

 

This should be helpful for you NismoZ_840. Here are some dyno/review from a specialty sponsor shop around here that installed the Injen on the 350HR. Incredible gains to say the least for just an intake ~10WHP/~1WTQ on two different occasions.

http://www.zcarblog.com/2009/02/05/p...e-install.html

http://www.zcarblog.com/2008/11/26/p...o-figures.html

 

thanks for all the info guys!!

 

Cool thanks! That is a pretty good difference on the high end. I hadn't seen a dyno on the Injens CAIs before.