Grimmspeed Intake - 20whp gains

Not sure you guys are following along over at Nasioc, new Grimmspeed intake made over 20whp on a Cobb Stage 2 tune (plus 12% more fuel to prevent detonation).

 

http://www.grimmspeed.com/content/images/intake_subaru_0814_wrxsti_17_original.jpg

 

Legacy intake is now in development, should be the same in cost, design and gains .

I've got my money earmarked for this and a cryotune. Very excited!

The conventional wisdom is that an intake does nothing. Here it does something. How?

The conventional wisdom is that an intake does nothing. Here it does something. How?

 

Conventional wisdom is based on the products that were on the market at the time of the wisdom's inception. Which means that it can become out of date as soon as a new product is released. I wasn't sold on the intake myself either until I saw the amount of engineering that went into it. They are being immaculate about it.

 

I did ask about showing power gains at lower boost levels (stockish to stage 1), usually the less boost you run the less of a restriction your intake or exhaust is thus power gains are usually much less compared to say 18psi. They came back saying that they got most of the gains running around 15psi, which is not far from stock boost levels.

 

I think you guys did it correctly, with how sensitive these mafs are you have to touch the tune at least a little to be safe.

 

I wouldn't mind seeing the power gains on Cobb stage 1 tune. I don't want to run 18-20psi on a daily car basically . I'm currently putting down around 230whp with stock intake, vf40 @13psi, and divorced -1 cat downpipe on my 05 LGT. I don't think my gains will be as extreme as yours are, but I think at least 5whp are in order. Perhaps I will have to just buy and test myself .

 

Just for knowing: All of these charts except for when specified are at about 15psi, as we've shown there are gains to be had without necessarily increasing boost. The Stock airbox Stg2 maps on our car during these tests were only making 15, not 18-20 so no worried there.

 

The stock airbox, stock tune (201whp) was 14.74psi, stock intake STG 2 stock intake OTS (219whp) was 14.88psi, GrimmSpeed intake STG 2 stock intake OTS (244whp) was 14.90psi, and the MAF scaled run at 15.56psi.

 

So I do think your gains will be similar

 

Chase

Engineering

The conventional wisdom is that an intake does nothing. Here it does something. How?

 

Conventional wisdom says the stock intake flows well into the 300whp range making aftermarket intakes a moot point. If you'll notice the hp went up, but the tune had been made for the intake and had +12% scaling. One could assume you'd see gains with another intake over stock if properly tuned and fueled.

 

The big difference is that on other cars you can bolt on an intake and add hp without tuning. Just bolt and go. It just doesn't work that way with our ECU's.

 

Grimmspeed gets a pass cuz they spend a lot of time in R&D making sure their parts have actual performance benefits. They understand Subaru intricacies and produce great parts.

After having Cobb Tuning suggest I may have to take my Cobb intake back off and replace it with the stock intake in order to control boost creep before they tune my recently built Rallispec / Cosworth piston motor, I'm gonna stay pretty skeptical that any aftermarket intake is a good idea on anything but a full on monster HP motor

their design is very similar to that of the AVO CAI. especially looking at their diagrams of maf placement, it seems to be almost a complete match

 

 

AVO:

http://legacygt.com/forums/attachment.php?attachmentid=31815&d=1171122587

 

Grimspeed for WRX

 

http://cdn2.bigcommerce.com/server5000/8fmm9av/products/353/images/1660/intake_subaru_0814_wrxsti_14_1600__85070.1430764400.1280.1280.jpg?c=2

Oh man I'm kind of liking the avo design more, it has a flow stack prebuilt into it and it's not welded thus you have more flexibility to move it around.

 

http://www.autocityimports.com//images/products/avo-subaru-wrx-sti-cai-1.jpg

http://www.autocityimports.com//images/products/avo-subaru-wrx-sti-cai-3.jpg

 

But the drawback is no airbox. Which does make it easier for FMIC guys though.

Oh man I'm kind of liking the avo design more, it has a flow stack prebuilt into it and it's not welded thus you have more flexibility to move it around.

 

http://www.autocityimports.com//images/products/avo-subaru-wrx-sti-cai-1.jpg

http://www.autocityimports.com//images/products/avo-subaru-wrx-sti-cai-3.jpg

 

 

But the drawback is no airbox. Which does make it easier for FMIC guys though.

 

 

Avo did make an airbox, but like the process west splitter its hard to come by. That being said, making a airbox isn't that difficult, especially compared to making a cai