[ender2664]

What are the problems some people are running into with the Mishimoto intake?

[Megahurtz]

It will lean out the Air Fuel Ratio a little. Check out the blog on their website, they have dyno graphs and testing of their intake. If your only mod is an intake and you plan to tune the car then any of them will net the same gains in the end but I would personally prefer the CAI unit. If you do NOT wish to tune the car then I would stick with a Rotofab.

[ender2664]

Originally Posted by Megahurtz

It will lean out the Air Fuel Ratio a little. Check out the blog on their website, they have dyno graphs and testing of their intake. If your only mod is an intake and you plan to tune the car then any of them will net the same gains in the end but I would personally prefer the CAI unit. If you do NOT wish to tune the car then I would stick with a Rotofab.

No tune. Considering some bolt-ons but no tune.
Why do you prefer the CAI but recommend the Roto-fab for non tune?
Does it lean it out just because it lets in too much air?

[Megahurtz]

Originally Posted by ender2664

No tune. Considering some bolt-ons but no tune.
Why do you prefer the CAI but recommend the Roto-fab for non tune?
Does it lean it out just because it lets in too much air?

The Mishimoto leans out the AFR because the MAF housing has a larger diameter (5inches vs 4.5 inches). While this lets more VOLUME of air in, it also slows down the airflow across the MAF. Without going into how MAFs work, this makes the MAF read less air than is actually entering the engine. The MAF reads less air and tells the ECU to add less fuel. And without going even deeper into fuel trims, the ECU will negate this over time.

[ender2664]

Originally Posted by Megahurtz

the ECU will negate this over time.

Meaning the ECU will figure out the car is running lean even though the MAF says it isn't? I obviously don't know where all the sensors are but it seems to me if the computer can sense both the air coming in and the AFR it would have to decide which one is lying to it. To fix the AFR it would have to negate the MAF reading or if it trusts the MAF it has to negate the AFR, does that mean the computer decides which one to follow if the two don't vibe?

Thank you for taking the time to walk me through this!

[Megahurtz]

Originally Posted by ender2664

Meaning the ECU will figure out the car is running lean even though the MAF says it isn't? I obviously don't know where all the sensors are but it seems to me if the computer can sense both the air coming in and the AFR it would have to decide which one is lying to it. To fix the AFR it would have to negate the MAF reading or if it trusts the MAF it has to negate the AFR, does that mean the computer decides which one to follow if the two don't vibe?

Thank you for taking the time to walk me through this!

It's a bit more complicated. The MAF will tell the ECU it see's X value of air and command the fuel for that value. But the O2 sensors will see the fueling is not where the ECU wants it to be and start incrementing the Long Term Fuel Trims to a positive value. Then the ECU will add extra fuel to make the O2's happy. This value will be carried over into wide open throttle. Then a majority of the HP gains seen (in an untuned car) will be negated.

An Intake is a worthwhile mod but you wont really see much unless you pair it with other mods and tune the car. If an intake is going to be your only mod then save your money. If you want to do more mods that do not require tuning then you can do the following without needing a tune.

-Rotofab
-catback exhaust (secondary cat delete optional) such as the borla modular system
-Ported LT1 intake and throttle body from EFI Tuning

These will get you a nice bump in HP without sacrificing any fuel economy or drivability.

[ender2664]

Originally Posted by Megahurtz

It's a bit more complicated. The MAF will tell the ECU it see's X value of air and command the fuel for that value. But the O2 sensors will see the fueling is not where the ECU wants it to be and start incrementing the Long Term Fuel Trims to a positive value. Then the ECU will add extra fuel to make the O2's happy. This value will be carried over into wide open throttle. Then a majority of the HP gains seen (in an untuned car) will be negated.

An Intake is a worthwhile mod but you wont really see much unless you pair it with other mods and tune the car. If an intake is going to be your only mod then save your money. If you want to do more mods that do not require tuning then you can do the following without needing a tune.

-Rotofab
-catback exhaust (secondary cat delete optional) such as the borla modular system
-Ported LT1 intake and throttle body from EFI Tuning

These will get you a nice bump in HP without sacrificing any fuel economy or drivability.

Cat back, intake, ported TB, ported IM and shorties are what I'm looking to do. Hoping that will put me around 500 at the crank.

[Megahurtz]

Originally Posted by ender2664

Cat back, intake, ported TB, ported IM and shorties are what I'm looking to do. Hoping that will put me around 500 at the crank.

which shorty header? does it bolt to OEM primary cats?

[ender2664]

Originally Posted by Megahurtz

which shorty header? does it bolt to OEM primary cats?

I believe there are two..Blackheart and gibson. I know gibson does and think Blackheart does.

[Dubchitts]

Originally Posted by ender2664

What are the problems some people are running into with the Mishimoto intake?

I believe alot had issues with the filter falling off. May have been fixed by now tho

[oldman]

Originally Posted by ender2664

I believe there are two..Blackheart and gibson. I know gibson does and think Blackheart does.

Hooker 1 and 7/8
JBA 1 and 3/4

stock replacement dimensions.

[glenB]

I don't see you getting 500 FWHP with your chosen mods. The shorties, even by Holley' admission, aren't worth the entry fee. Your other mods are going to be negligible without making the engine suck harder, meaning a cam. While they represent a restriction, if the engine isn't drawing it, then it's just a waste.

[ender2664]

Originally Posted by glenB

I don't see you getting 500 FWHP with your chosen mods. The shorties, even by Holley' admission, aren't worth the entry fee. Your other mods are going to be negligible without making the engine suck harder, meaning a cam. While they represent a restriction, if the engine isn't drawing it, then it's just a waste.

Can you send me the link to where you say holler says their product is not worth what they charge?

[glenB]

Originally Posted by ender2664

Can you send me the link to where you say holler says their product is not worth what they charge?

If you need it spelled out, have at it

https://www.holley.com/products/exha.../70301304-RHKR

"Max dyno gains of +8.59 HP & +7.3 LB.FT torque" for $700 + labor and small parts

That's max gains, not average, not mean, but max

Scroll through the pics of this link and compare the factory manifolds to the Holley.

http://www.superchevy.com/how-to/exh...heart-exhaust/


For the gains Vs money, long tubes or don't bother.