Forged Performance: A couple of visitors stopped by...
 

A couple of local customers stopped by with their new 370Z's. I went ahead and loaded both of them on the dyno.
Bone stock, and Stillen Exhaust/Berk HFC. Needless to say, I was SHOCKED with the results. :driving:

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37 hp from cats and exhaust? Did I understand that right?

Yeah, more info please!

did you run them multiple times? were they both already broken in? more info is needed that number seems way way low on the bone stock

It was done on a Dyno Dynamics dyno (DD), which is pretty notorious for its low results. Semtex explains it all in the following post:

http://www.the370z.com/intake-exhaus...html#post46196

Mike's Z just passed the 1200 mile mark (the white, bone stock one). Mine had right around 1500 miles (the blue one with the Stillen/Berk setup). Yes, there were multiple runs on each. I think around 5 or 6 runs on each, if I remember right.

Yes you remember right Ben... I was hoping for 260hp for mine but that darn DD killed me lol. these two cars are as close as you could get in the real world the only differences was mine has navigation and Ben's had 300 more miles with the upgraded exhaust and cats. We both had about 6 runs each with the highest run recorded. Ben's car was consistent in staying around 290-291 with his setup. Mine stared out cold at 248 and once warmed up remained constant around the 253-254 range.

What is most important is how flat the torque curve is and how these mods kept them that way all the way to redline!

well i must say then that is an amazing gain! Ben and Mike have you driven each others cars? can you feel that extra horse power? oh and are both 6spds?

We appear to have doubters on other threads. lol

Thread: http://www.the370z.com/nissan-370z-g...html#post47224

Haven't driven each other's cars. Yes, both are 6MT. Both have sport pkg.

What kind of A/F (air/fuel) ratios were you seeing between the stock and modded car?

Ohh I can tell you Ben's car is faster lol I rolled on the throttle a couple of times that day and he ate me up! His car definitely makes more power and I can believe the 37hp!

also when we were dynoing my car sat a ok on the dyno however when Ben's car was on the dyno it wanted to jump off from the extra power. the cars on the dyno were totally different animals. Mine was calm and smooth where as Ben's was still smooth but it was almost like a lil monster was growing in their! like i said both cars a practically identical except for 300 miles and Nav (best feature EVER!) hehe

Can each of you describe how you handled your "break-in"?

I tried to do the 'keep it below 4000 rpm' thing but really just couldn't. I ended up driving normal, which for me means that I usually shift at around 5000 rpm. I did make a point to not drive it hard until the 1200 miles were up though (i.e., no WOT to redline). I did take it up to redline during the test drive though, and I should also mention that it already had 20 miles on the odo when I bought it, so who knows how it was treated during those first 20. Finally, I don't know if this could be a factor at all, but as I work from home it took me quite a while to complete my break-in miles (about 2 months). I think Mike took a lot less time to complete his break-in cycle.

Our dyno does read quite a bit lower then most DynoJets and DynoPaks. So don't be alarmed with a 250'ish baseline.

Here are our rough baseline numbers we typically see on our Dyno Dynamics

VQ35DE 215-220whp
VQ35HR 230-235whp
VQ37HR 250-255whp

Hey Sharif what did the A/F ratios look like and how much change was there if any? I realize you typically see a change when doing intake side stuff more so than with exhaust stuff but I am still curious

Wideband was not connected on these runs, due to a bad sensor. :(

yea my break-in took no time at all. for the first 700-800 miles i followed the manual after that I did my normal break in with progressively higher revs and engine breaking. I got the car right off the truck about 3 weeks ago with only 8 miles on it and now I am at 1500 miles :D I drive a lil bit... I believe the car will make more power with some more mileage on it.

http://onfinite.com/libraries/1468412/af8.jpg
That's an amzing picture! Love it.

I am shocked at the result as well but not totally surprised. VQ is an amazing engine and it clearly shows here. I am very happy to see how well it is responding to simple bolt on mods. Hats off to STILLEN and BERK for making some great products. I am pretty sure other exhausts will provide similar results as well. Also, curious to see what kind of number those exhausts will put down.

Thanks Sharif for posting.

No problem at all.

And just to be crystal clear, it is not accurate to interpret the results as a before/after. They are two different cars, and we havent done a true before and after of the effects of exhaust, HFC. This was a simply a snapshop of the power these two cars were making, so it should be viewed in that context. :)

Hey Sharif, I'll be back up at your shop on Wed. for another dyno to see what the Stillen G3 intakes produce (got them installed last week). Hope to see you there!

wow, 37 whp and around 25 wtq with just exhaust, HFC and intake... on a NA car! Outstanding! ;) ... and the gains are all over the curve. Very nice!

I have a couple questions for semtex:

1. Any weight savings with the new set up?
2. How about noise? Is it close to stock? Any droning issues? I can't stand loud exhausts (been there done that, and don't want to come back)

Thanks!

serge, I suggest you check out these two threads. They include many more details including video clips so that you can hear how my car sounds for yourself.

This thread covers the installation of the exhaust and HFCs that Sharif is talking about: http://www.the370z.com/intake-exhaus...berk-hfcs.html

I have since installed a new intake, and just yesterday I got more dyno results and made another video. All of this is detailed here: http://www.the370z.com/intake-exhaus...eview-etc.html

You might also want to check out my journal thread, where I document all the things I've done in a single thread: http://www.the370z.com/members-370z-...blue-370z.html

Thanks semtex!

The info you provide in these threads is priceless!

Not that I'm all about saving fuel, but with the gains that you get from these two upgrades being so noticeably high, wouldn't you save some significant fuel?

Yep. Funny you should ask, because I just filled up and was pleasantly surprised to discover that I got 16.8mpg my last tank. That might not sound so great, but consider that I was getting around 14.7mpg before the upgrades (I have a lead foot). Also consider that I did something like 8 WOT dyno pulls on the past tank of gas, not to mention drove pretty hard for a couple of days after installing the intakes because I wanted to make sure the ECU 'learned' the new mod. All in all, when I drive around 'normally', I have to use less throttle to get the same acceleration pre-mods, hence the fuel savings.

Thank you for stating that Sharif, People are assuming these mods will yield 37 rwhp gains when you cannot compare 2 different cars.

For those that don't know, these factory ECU's are running dynamic timing maps which change and adapt over time. Car A could be running more or less timing than Car B, the A/FR will be slightly off as well. The ECU makes these adjustments based on a number of things, including how the cars are driven, temperature, altitude, etc.

Not to mention that there are a range of tolerances in O.E. engines, one might have slightly higher compression, etc. Just too many variables for these numbers to be even considered comparable.

So no, this does not prove that Still exhaust and high flow cats will yield 37RWHP gains, sorry :(

It does prove that Car A makes "X" amount of power more than Car B, that's about it.

Great pics BTW Sharif, I am so jealous of your GT-R, I am glad you picked the right color!

-George
GT Motorsports

Porsche hand picked the engines for the 964 variants of the Carrera Cup. The engines had to be factory issue but nobody said they couldn't take the cream of the crop out of the dyno room.

There you go :)

-George
GT Motorsports