STILLEN Longtube G3 Intakes. Review, Dyno and Impressions.

semtex

I'm using Dyno Dynamics (known as the 'heartbreaker dyno'). It reads slightly lower than Mustang, even. From the information I've been able to find just by researching on the net, if you take a Dyno Dynamics reading and multiply it by 1.18, that gives you an approximate equivalent DynoJet number. Mustang Dynos read lower than DynoJet, but higher than Dyno Dynamics, and have a DD multiplier of 1.115. So if you wanted to convert my current DD reading of 291.7 whp to an approximate Mustang equivalent, multiply by 1.115 for a reading of 325.25. Conversely, if you want to convert RCZ's current Mustang reading of 278 whp to a DD equivalent, multiply it by 0.9 for a reading of 250.2. Note that all these calculations are approximate because the conversion factors are non-linear (i.e., they change as you go up and down the HP scale). Personally, I find the 250.2 number suspect, as we ran bullitt5897's bone stock 370Z on the same DD dyno that we ran mine on, and his car came in with 256 whp. I find it inconceivable that RCZ's car would pull less whp on that same dyno when he has the G3 intakes. I think this all just goes to show what an inexact science this can be when comparing different cars on different dynos, so we would be well advised to take this all with a grain of salt.

There's more info in this thread if you're interested -> http://www.the370z.com/vq37vhr/2199-...alculator.html

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"There are no small accidents on this circuit." -- Ayrton Senna
316.8whp & 248 ft/lbs (Dyno Dynamics) | 319whp & 256 ft/lbs (DynoJet) (04/23/10)
Stillen G3 CAI, CBE, Pulley / F.I. LTH / GTSpec Ladder Brace / Setrab Oil Cooler / UpRev-tuned by Forged Perf.

semtex

Hey RCZ, have you noticed any change in the interior sound from the intakes? I haven't noticed anything significant from mine, but I suspect that's because any change from the intakes is being drowned out by the sound from my Stillen exhaust / Berk HFCs.

__________________
"There are no small accidents on this circuit." -- Ayrton Senna
316.8whp & 248 ft/lbs (Dyno Dynamics) | 319whp & 256 ft/lbs (DynoJet) (04/23/10)
Stillen G3 CAI, CBE, Pulley / F.I. LTH / GTSpec Ladder Brace / Setrab Oil Cooler / UpRev-tuned by Forged Perf.

Black kNight

thanks RCZ woo big increase in hp

ok i have Question
If some water got inside the intake due to the place where they are . Is it going to effect the car i mean like while driving in the rain

Josh@STILLEN

These have been proven to be fine on the G37, which is even more open being the grille is in front of the filters.

dad

How about when you wash the car?

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GVick87

Or when combined with Mines Intake Air Scoop Type II?
Mines - Intake Air Scoop Type II Set, Dry Carbon

Josh@STILLEN

No problems when washing the car.. and the Mine's scoops would be roughly the same open area as the G37 grille, if not less.

Water becomes an issue when you're submerging the filter, and revving the engine.. if you submerge the filters at the level they are and gun it, you're trying to drive through a river.. and that's not going to work on many levels.

Also the filter location being where it is versus down near the road also helps maximize the cool air pickup.. air coming off asphalt in any sort of warm weather can really effect the intake air charge..

The Weapon

I want.. Is there going to be a group buy for this?

Namir

RCZ, Great write up and impressive results.
But I must say, these results were somewhat confounding based on your earlier dynos. You said that when you dyno'd with no filters, you saw no gains. Suggesting that air flow through the filter was not a limiting factor. Now however, you see 15-20HP gains with the long tubes. If the filters truly make no difference in HP gains, then we are led to believe that 20HP gains are to be made by rerouting the air to the throttle body through these tubes rather than the stock airboxes? Is the stock airbox design that poor/restrictive?


Promising gains regardless of where they came from. I don't care if its some STILLEN black magic trick. This is a significant step toward the 300HP N/A mark.

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MightyBobo

The stock filters probably arent BAD...its their location, and the fact that a lot of engine bay heat can easily be brought in. Moving them outside of the engine bay is probably a fairly large improvement.

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RCZ

There may be a half hp difference...this is one of those things that makes no difference...

I agreed because its possible... I didn't think it would be this easy though.

Sorry, but things like these don;t make much of a difference. This is air we are talking about, not water. There's plenty of air and plenty of cold air flowing through there when the car is actually moving. If you want to talk about the details, you gotta take that into account too. The dyno is sitting still, granted there is a fan, but its never going to mimic the air flow it gets when you are actually moving. If anything it would have LESS heat soak and perform better on the street.

Yeah there's definitely a sound difference. I can hear them even at low RPMS actually.

Completely stock exhaust.

Again, minor point that doesn't deserve any more discussion. Guys the ONLY time water will cause problems with intakes is if you are revving it when the intakes are under water. Otherwise stop worrying about the water.

There's a few factors that lead to this. First of all, the corrugated section is gone. Second the bends on the intake are smoother and therefore better flow. Third the intakes themselves have a lot of surface area, more so than open stock intakes. 4th the diameter of the piping may have changed a little, tricking the MAF into thinking the AFR is richer than it actually is. Usually when you tune for these things in cars that need bigger intakes you do something called scaling, where you adjust for the bigger piping. Without tuning, the intake may be helping the car run slightly leaner (NOT DANGEROUS, don't jump to conclusions already, this isnt going to blow up your motor) which would be idea for making some safe hp. 5th, the placement allows it to draw colder air. 6th STILLEN designed this intake to work, that means lots of R&D on the design to make it flow and perform as well as possible with the motor.

nogoodname

Knight,
the Intakes on the Z seem to be covered up in the front by the bumper and the metal bar plus foam.
on the G37, it's right in front of the grille and ppl drove it in the rain, nothing bad happened. Just dont floor it while it's raining heavily. there was only a little piece of plastic protecting the filters. if the G survived, i;m sure the Z can manage as well or even better.

semtex

I believe that styrofoam block is actually part of the crash structure. Like it's there to absorb energy in the event of a collision, so taking it out probably isn't a good idea. As for the shotgun, I'll give it some serious consideration.

__________________
"There are no small accidents on this circuit." -- Ayrton Senna
316.8whp & 248 ft/lbs (Dyno Dynamics) | 319whp & 256 ft/lbs (DynoJet) (04/23/10)
Stillen G3 CAI, CBE, Pulley / F.I. LTH / GTSpec Ladder Brace / Setrab Oil Cooler / UpRev-tuned by Forged Perf.

SoCal 370Z

You are correct, and there is also a second reason:



Please do not remove your impact styrofoam, at the request of crash test dummies around the world.

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RCZ

I'll post again when I get home, but fyi the easiest way to reset an ecu on any car is to disconnect the battery and pump the brakes. that's it, there is no magic. that discharges the system and then just reconnect battery and ur done. I've done it many times on many cars.