2008 H3 performance
Senior Member
Joined: May 2012
Posts: 2,005
Obviously the OE engineers weren't so narrow sighted as to make the factory intake tube too narrow or restrictive by mistake and choke out an otherwise good design.
It's pretty well accepted that the gains of adding intake and exhaust mods alone is very minimal on most factory motors made today without adding fuel, spark, and duration into the equation.
But the part of the equation that is nearly always overlooked in these discussions is durability and longevity.
Hell, with the right mods you can get a lawn-mower engined mini-bike to run like it's hair is on fire...for a short while anyway.
These inline motors are designed with longevity in mind from the factory,and have also been tested at great length to provide maximum performance.
If it was simply as easy as adding a new filter or intake tube to get 10 free horsepower throughout the entire horsepower curve, the factory would have likely done that rather than bore the engine from 3.5 to 3.7.
It's pretty well accepted that the gains of adding intake and exhaust mods alone is very minimal on most factory motors made today without adding fuel, spark, and duration into the equation.
But the part of the equation that is nearly always overlooked in these discussions is durability and longevity.
Hell, with the right mods you can get a lawn-mower engined mini-bike to run like it's hair is on fire...for a short while anyway.
These inline motors are designed with longevity in mind from the factory,and have also been tested at great length to provide maximum performance.
If it was simply as easy as adding a new filter or intake tube to get 10 free horsepower throughout the entire horsepower curve, the factory would have likely done that rather than bore the engine from 3.5 to 3.7.
Super Moderator
Joined: Jul 2007
Posts: 13,101
From: Boat Town USA MI
Super Moderator
Joined: Jul 2007
Posts: 13,101
From: Boat Town USA MI
Obviously the OE engineers weren't so narrow sighted as to make the factory intake tube too narrow or restrictive by mistake and choke out an otherwise good design.
It's pretty well accepted that the gains of adding intake and exhaust mods alone is very minimal on most factory motors made today without adding fuel, spark, and duration into the equation.
But the part of the equation that is nearly always overlooked in these discussions is durability and longevity.
Hell, with the right mods you can get a lawn-mower engined mini-bike to run like it's hair is on fire...for a short while anyway.
These inline motors are designed with longevity in mind from the factory,and have also been tested at great length to provide maximum performance.
If it was simply as easy as adding a new filter or intake tube to get 10 free horsepower throughout the entire horsepower curve, the factory would have likely done that rather than bore the engine from 3.5 to 3.7.
It's pretty well accepted that the gains of adding intake and exhaust mods alone is very minimal on most factory motors made today without adding fuel, spark, and duration into the equation.
But the part of the equation that is nearly always overlooked in these discussions is durability and longevity.
Hell, with the right mods you can get a lawn-mower engined mini-bike to run like it's hair is on fire...for a short while anyway.
These inline motors are designed with longevity in mind from the factory,and have also been tested at great length to provide maximum performance.
If it was simply as easy as adding a new filter or intake tube to get 10 free horsepower throughout the entire horsepower curve, the factory would have likely done that rather than bore the engine from 3.5 to 3.7.
Performance mods are like keeping a Sig on your belt, better to have it when you need it, than need it when you don't have it.
Member
Joined: May 2014
Posts: 31
You "buddy" at FSR is daft. The I5s have a robust response to intakes, if he ever actually worked on one he might have a clue. Maybe you should re-read post #2 and consider yourself corrected. Here's a tidbit for your buddy, 10HP from nothin but an intake.
I've pulled 202 with my 07 on 33s at 40PSI, but it has a bunch more than just an intake. Considering a bone stock 3.7L H3 pulls about 173-175, I'd say picking up 100% reliable 25HP & TQ ain't bad.
As to H3 I5 exhaust, by itself, does virtually nothing except provide some sound. You can make some HP with a gutted Mini-Cat or with a header, but that's a different story. A better flowing exhaust works well with other mods, but the proven biggest bang for the buck is a PCM Tune and an intake, followed closely by an Efan conversion.
I've pulled 202 with my 07 on 33s at 40PSI, but it has a bunch more than just an intake. Considering a bone stock 3.7L H3 pulls about 173-175, I'd say picking up 100% reliable 25HP & TQ ain't bad.
As to H3 I5 exhaust, by itself, does virtually nothing except provide some sound. You can make some HP with a gutted Mini-Cat or with a header, but that's a different story. A better flowing exhaust works well with other mods, but the proven biggest bang for the buck is a PCM Tune and an intake, followed closely by an Efan conversion.
Looking at your charts I'd say keeping my 200+ is a better choice. Again, I may alone here but I ain't racing desert or dragging light to light. You gained 11hp and 12ftlb for a lot of money at 4500rpm's. I don't need (imagine you don't either) HP in the 4k+ range but bwt 1500-3kish. How often can you use that gain in 'normal' conditions? Honestly, if I could throw away that money and not blink an eye I would but it doesn't appear to pay off under 99% of conditions. I do wonder if anyone has ever done a dyno run with a snorkel though? - At least that would look cool too. Again thanks for the info - No offense meant here with my thoughts and I hope you understand my response to the daft comment.
Last edited by ACannell; Jul 1, 2014 at 07:00 PM.
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