JET releases N* Performance!

[CadillacSTS2003]

not like anyone makes a performance air box for our cars anyways....
just a volant for devilles...

[Ur7x]

Originally Posted by Patrick7997

Those were very popular in the C5 Corvette World.... almost always done in combination with an improved air intake system, like a Blackwing or something....

FWIW, I put a Blackwing and a MAF sensor in my C5, and it made a real nice difference... sounded better, ran better, pulled harder..... And after the Borla Cat-Back, it was really sounding and running nice.... car literally came to life....

Funny that a Corvette doesn't need to have it's "air straightened" with some honeycomb thing, but a Northstar seemingly does.....

Funny how I keep hearing that the "Stock" airbox in a Northstar is so great, yet in the Corvette world, it was common knowledge that a big part of the engineering in the stock pos airbox was to get the sound down to EPA levels... thus, the airbox was the first thing to go in the garbage when you got home.... Hmm.....

Its an apples to oranges comparison. from the Factory the LSx engines are known for an amazing exhaust system. The factory exhaust "manifolds" are so good that people have LOST performance and flow by installing tubular headers. The "cork" in the bottle on these motors is somewhere else... A little upstream... Both Vettes and LS1 F-Bodies get "significant" improvements upgrading the intake side... "air boxes",intake manifolds, high flow air filters all work. And work well.

Northstars are a completely different animal. From the factory the intake side "seems" to be more then adequate to support well over 300HP and 4.6 Litres. The cork in a Northstar is the "tortuous" path the exhaust needs to take over, under and around as it makes its way to the back of the car. Unfortunately the packaging of these motors makes it all but impossible to fix this issue.

The general consensus, to make more power out the Northstar, first look at the exhaust system. If you can make this better, then you can consider all of the intake tricks... Until then any gains you may achieve will be at best... "minimal"

[CadillacSTS2003]

egh
with enough time on of the the lifts at my shop
i could build a better crossover pipe from the front header..

[Ur7x]

Originally Posted by CadillacETC1997

I could build a better crossover pipe from the front header..

Now THAT would be Cool!

[CadillacSTS2003]

id have to get it on the lift
but heck look what i built with it already ahhahaah
you know how bad ass my exhaust is
def take some down time to design it
but i prob could pull it off...
wonder if ppl would buy that if i made them...

[Ur7x]

Yes!...

This would help our cars...

Forget about:
Hope for the best chips...
Useless air boxes...
0 Hp K&N filters...
Bling Bling wings, grills etc...


As far as I can tell there are two questions here:
1) Will the stock computer be OK with the reduction in exhaust back presure and
2) I think the steering rack is in the way... Whatever you figure out has to be dead easy to install (i.e. no need to drop the cradle)

This is not going to be easy.

Good Luck!

[CadillacSTS2003]

well obviously the fitment and clearance will be different from Eldorado to Seville, such as the steering rack as you said and also the seville engine bay (especially the 98+) is less cramped than the eldo and not to mention worrying about bottoming out or how it will move when on heavy load vs idle,
on the note about install, performance isnt alway gained in 10 minute plug and play installs, however i will take this on as my summer project to build one and maybe a few extras on a limited production run

with my opened up exhaust i had no CEL so i assume its just fine


and i SERIOUSLY doubt my chip was a hope for the best chip, i think it indeed worked...
and my grille looks dead sexy on metallic silver cars... other colors it makes it look like a ESC grille but b.c my car is silver it looks made for the car...

[97STS4ME]

No!!! Mass does NOT equal density. This is basic physics...
Density is generally mass/unit volume.

Well, I guess we know how much our wonderful government school system taught me.
[/offtopic]

[codewize]

Now that we have the density vs volume problem out of the way lets talk about the MAF in general.

First of all no one EVER said that they worked because they were bigger. I don't even know if they are bigger. The supposed reason for HP gains is that an aftermarket MAF understands and relays information better when a) the air is colder than it should be, or is expected to be. and b) there is more of it crossing the MAF.

I understand the TB is the bottleneck BUT if there are restrictions such as the air box or other and the factory MAF is not capable of compensating the fuel ratio for the change in air then an after market MAF COULD work.

[Ur7x]

Originally Posted by codewize

I understand the TB is the bottleneck BUT if there are restrictions such as the air box or other and the factory MAF is not capable of compensating the fuel ratio for the change in air then an after market MAF COULD work.

Except the TB is not the bottleneck on a Northstar... The exhaust side of the motor is.

[codewize]

Ok fine, my statement still stands.

Originally Posted by Ur7x

Except the TB is not the bottleneck on a Northstar... The exhaust side of the motor is.

[Gearheaad43]

The reason for loss of low end when using a CAI is simply because the CAI introduces more air into the engine then the stock air box , Thus PCM is not programmed for a CAI,,, Meaning it "leans" out the mixture slightly on idle and low RPM... .... reducing low end... the JET MAF is probably calibrated for more AIR flow than a STOCK AIR BOX... Enriching the fuel mixture slightly to regain the low end.

[submariner409]

If a Mass Airflow Sensor/Intake Temperature module performs as the names imply, then the airflow/temperature signals generated depend on voltage changes controlled by resistance across different metal/crystal interfaces. I have no idea what manufacturer GM obtains its MAF/IT units from, nor do we know where JET and Granatelli obtain their units. The airflow/pulse modulator screen isn't the restriction you may be led to believe. We've been through that. The AF/Temp calibration can be changed in three ways: different "transistor" junction resistances (not likely), or different resistance and/or voltage in the control sensing circuits. That said, changing operating electrical parameters will definitely change engine performance. The change may or may not be agreeable, depending on how you like to drive a given vehicle. The whole GM PCM hardware/software programming is targeted for the majority of perceived owners of a given vehicle. You mess with that programming at your own risk.....maybe good, maybe bad, and hopefully come up with a performance change that suits you. Change things one at a time, spend the bucks on a dyno run for each change, and then you will know for sure where your dollars went. Even a slight decrease in performance can be perceived as a gain if there is more noise from somewhere...air or exhaust.

[codewize]

That's what I'm saying and I understand that to make sense but everyone disagrees with the fact that an aftermarket MAF does anything for the engine. Now, having said that it's almost a catch 22 because the job of the MAF is to tell the PCM how much air there is to get the mixture correct SO one would think or assume that no matter what happened to the air flow the MAF would adjust for it.

Originally Posted by Gearheaad43

The reason for loss of low end when using a CAI is simply because the CAI introduces more air into the engine then the stock air box , Thus PCM is not programmed for a CAI,,, Meaning it "leans" out the mixture slightly on idle and low RPM... .... reducing low end... the JET MAF is probably calibrated for more AIR flow than a STOCK AIR BOX... Enriching the fuel mixture slightly to regain the low end.

Right, that's how I want to work this but no one around here has a friggin dyno.

Originally Posted by submariner409

You mess with that programming at your own risk.....maybe good, maybe bad, and hopefully come up with a performance change that suits you. Change things one at a time, spend the bucks on a dyno run for each change, and then you will know for sure where your dollars went. Even a slight decrease in performance can be perceived as a gain if there is more noise from somewhere...air or exhaust.

[codewize]

Oops