Grimmspeed intake on track
 

Grimmspeed seems to have developed an intake that allows the engine to produce significantly more power than the OEM intake. Their posts are detailed, thorough and well-written. They have documented gains with multiple dynos, as have other people using it. And the air:fuel looks good, too. It's tempting to buy it.
That said, I wonder how it performs when the car is really pushed, lap after lap. Has anyone here used this intake on track? If so, what are your thoughts? I'm really interested to know how the car behaves with the Grimmspeed intake in a racing application, not just on the street or a dyno. I'd love to see someone test it on a track with the same detail Grimmspeed tested it on a dyno.

your question has hidden assumptions in them that you've not voiced.


if the intake has proven to supply the engine with more air, this will not change when you drive the car "hard"


if you're worried about heatsoak, with the beefy shielding I don't think it would be an issue.


what is it that you're worried about?

I'm curious to know if the same types of gains seen on the dyno can also be realized reliably on the track when the car is really being pushed hard for 20 minutes. Consider it fear of the unknown. I don't know what I don't know. It is a completely open inquiry. "There is no difference" is an acceptable answer.

The intake is just a tube that makes it easier for more air to get in the motor. That improvement applies regardless of how long or hard you run the motor, unless you do something ridiculous like place the inlet filter so close to the header that they're touching. If there's heat shielding, this isn't a concern.

What does make a difference is the tune you're running. Somewhere here there is a great thread about what constitutes a "good" tune for the track, that may be worth your while.

"there is no difference" :)


your main points of concern for hard driving is engine cooling and lubrication. If an engine is being properly lubricated at high rpm and is maintained a proper operating temperature then it can run hard for a long time. The intake has no impact on the stress of the engine and will provide the same gains as it would on the dyno... (pending ambient temperatures and elevation, of course).

If anything, you'll probably see better gains on a track than on a dyno. You'll have a better supply of fresh air at higher speeds on a track than you'll get on a dyno.

Look for dyno pulls done back to back for signs of heat soaking, bonus points if IAT is logged. I'd bet if you're happy with the dyno charts, you'll be happy with how it performs on track.

The only issue I see with it on the track is people have noted that it rubs against oil cooler lines under driving conditions.

As does the stock air box...

hehe, you guys said "box".

Hey guys, I appreciate you replying to this thread. There is a lot of common knowledge and internet wisdom here, but I'm looking for a more scientific approach. I agree with everything you all have written, but has anyone actually measured and confirmed these statements on-track?

How are you going to measure power output when not connected to a device that measures power output?

My God man, it is a tube and 5hp. If you want it, then go put it on your car.

I wouldn't bother.

I can make any part look like it makes more power on a dyno by manipulating the car, without making ANY actual alterations to the car itself, or the dyno calibration.

6whp is within the error range of a roller dyno.

The only thing you would be able to measure on a track would be IAT, and you would basically have to have two cars on track at the same both logging IAT to see the difference at the same point in the track.

LMFAO!!!!!!! No one will test it cuz real track drivers dont give a eff of air intake - 5-10 whp not gonna cut lap time even 0.5 sec. Fastest FRS/BRZ drivers usually has bone stock engine - @WoOosOn

Real track drivers don't care about an extra 5-10 hp? I know plenty that would disagree with that statement.

if I did a blind test with someone by having a remote switch that would give a 5hp boost in a ~2800lb car, I would bet money that people would not even notice me flipping it during the course of a 20 minute session.

:thumbsup:


The amount of data Bob at Drift-office has is incredible, you would never believe how closely some of these heavily modded BPU cars line up with the 100% stock cars with a header+tune.

The point is that there is no sense in a scientific measurement. First, if someone did, it would be pretty broke-ass science because no one has nearly the time or money a proper "scientific" test would take. And, more importantly, because aftermarket intakes do pretty much nothing.

You could install CMS Lap Timer on a iOS or Android phone and use it to measure before and after HP to get your scientific test.

Even pros have a little variance in their times, and your results would only speak to that day, with that weather, and with X number of oil spills on the track...there are too many variables to control for to try and measure such a paltry HP change.

This is a case of needing to shoot the people with calculators so we can build the damn bridge already.

The lap time difference 5whp would make would be very minimal, and smaller than the average variance between laps for any driver. You'd have to run A LOT of laps before and after under the exact same conditions (air temp/humidty, track temp, wind, etc) to get any statistical difference out of the data.

The lap timer app measures HP. You can overlay the HP graphs to compare.

What is the big deal?


It's an intake...


5whp isn't some crazy significant gain. I have a GS intake and when I installed it I noticed a VERY VERY SLIGHT difference above 5k but that's it. After one or two pulls, it felt the same as it did before.


Take it to the track. Datalog. Is the MAF Scaling f*cked up? Is it pulling timing? Are IATs climbing significantly? Any knock? Does the car sound/feel like sh*t?


Is your answer "no" to the following questions? Good, it's working.


/thread

That's based of g readings from the accelerometer in your phone, which isn't nearly accurate enough to give consistent readings back to back to back.

No, it is calculated using GPS. Accurate enough and quite consistent.

Phone GPS doesn't sample fast enough for very accurate readings either. Plus, that relies on you being on the exact same line lap after lap or the reading will be skewed.

At the end of the day, it doesn't matter how the data is collected, you're going to have to run a lot of laps before and after, under identical conditions, to do any meaningful analysis on the data. It won't matter though, because 5whp isn't going to give any significant change in lap time at all.