Considering 85mm TB/Intake Manifold Combo
Considering 85mm TB/Intake Manifold Combo What up my fellow F-Body owners? I'm thinkin bout gettin a 85mm tb/intake manifold combo. Can anyone give me some advice on would be tha best thing to get? I wish for more airflow and will I have any gains throughout entire RPM range? Thanx for good advice. Check my sig to view my current setup.
I'm pretty sure everyone will recommend a nice TB in addition to any mod list. Since you have an '02 you will have the LS6 intake already an 85mm intake (not sure which one that is off hand personally) will give you some marginal gains. Most say the FAST90 (or 92) will give only about 10-20hp depending on the other mods and will significantly help up top but may cause some low end loss. food for thought.
I'm pretty sure everyone will recommend a nice TB in addition to any mod list. Since you have an '02 you will have the LS6 intake already an 85mm intake (not sure which one that is off hand personally) will give you some marginal gains. Most say the FAST90 (or 92) will give only about 10-20hp depending on the other mods and will significantly help up top but may cause some low end loss. food for thought.
What up my fellow F-Body owners? I'm thinkin bout gettin a 85mm tb/intake manifold combo. Can anyone give me some advice on would be tha best thing to get? I wish for more airflow and will I have any gains throughout entire RPM range? Thanx for good advice. Check my sig to view my current setup.
Don't do anything other than maybe a ported & polished stocker (TUNE AFTERWARD for benefits), unless you get an intake w/ a larger opening. Every study that I've seen ragarding intake flow states the greatest limiting factor as the inlet opening. So, if you can get an 85mm or larger intake, then an 85mm TB & MAF are good adders. Again, you must get a tune afterward or you may actually lose power. With a tune, you will be very happy.
The reason the aluminum Weiand intakes remain popular is because it can be opened up. When the inlet is opened to 85+mm & the runner inlets ported, it produces great low end torque & holds flow to 6400 ish. Forget the heat soak non-sense, intake air temps prior to the intake are a larger reason for lost power thanis air traveling through the intake & then into the aluminum heads. Funny how none of the heat soak guys ever complain about heat soak from the heads. Anyway, aluminum Weiands' can be found relatively cheap theses days & 85mm TB from Summit, Jegs....etc., are also the best value, 85mm MAF off e-bay can be had for $20-$40 depending on whose selling @ the time you're buying. So, bang for the bucK + a tune, this is my suggestion. Good-luck
Don't do anything other than maybe a ported & polished stocker (TUNE AFTERWARD for benefits), unless you get an intake w/ a larger opening. Every study that I've seen ragarding intake flow states the greatest limiting factor as the inlet opening. So, if you can get an 85mm or larger intake, then an 85mm TB & MAF are good adders. Again, you must get a tune afterward or you may actually lose power. With a tune, you will be very happy.
The reason the aluminum Weiand intakes remain popular is because it can be opened up. When the inlet is opened to 85+mm & the runner inlets ported, it produces great low end torque & holds flow to 6400 ish. Forget the heat soak non-sense, intake air temps prior to the intake are a larger reason for lost power thanis air traveling through the intake & then into the aluminum heads. Funny how none of the heat soak guys ever complain about heat soak from the heads. Anyway, aluminum Weiands' can be found relatively cheap theses days & 85mm TB from Summit, Jegs....etc., are also the best value, 85mm MAF off e-bay can be had for $20-$40 depending on whose selling @ the time you're buying. So, bang for the bucK + a tune, this is my suggestion. Good-luck
The reason the aluminum Weiand intakes remain popular is because it can be opened up. When the inlet is opened to 85+mm & the runner inlets ported, it produces great low end torque & holds flow to 6400 ish. Forget the heat soak non-sense, intake air temps prior to the intake are a larger reason for lost power thanis air traveling through the intake & then into the aluminum heads. Funny how none of the heat soak guys ever complain about heat soak from the heads. Anyway, aluminum Weiands' can be found relatively cheap theses days & 85mm TB from Summit, Jegs....etc., are also the best value, 85mm MAF off e-bay can be had for $20-$40 depending on whose selling @ the time you're buying. So, bang for the bucK + a tune, this is my suggestion. Good-luck
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Staging Lane
Joined: Jul 2008
Posts: 71
Likes: 0
From: Denver, CO
The intake restriction isn't the inlet typically, it's the plenum and runners. TPIS makes a 90mm LS6 style intake and it won't keep up with a fast 90/92.
If you're going to pay the money for an aftermarket intake, spend a little more and get the Fast, because everything else is margin, if any improvement over the LS6.
If you're going to pay the money for an aftermarket intake, spend a little more and get the Fast, because everything else is margin, if any improvement over the LS6.
The intake restriction isn't the inlet typically, it's the plenum and runners. TPIS makes a 90mm LS6 style intake and it won't keep up with a fast 90/92.
If you're going to pay the money for an aftermarket intake, spend a little more and get the Fast, because everything else is margin, if any improvement over the LS6.
If you're going to pay the money for an aftermarket intake, spend a little more and get the Fast, because everything else is margin, if any improvement over the LS6.
Agreed
And a FAST won't cost you anything down low it just doesn't typically show any gains over an LS6 til 4500+ Yes, in the context that we are speaking, stock 78mm, the inlet is typically & is most definately the restriction. We are discussing the benefits of an 85mm TB & MAF on a ported Weiand. Nowhere have we discussed 90mm top of the line alternatives. If we were talking 90mm, an LS6 & its' runner wouldn't even be part of the conversation.
If you can swing it, I'd go Weiand over BBK & make sure you remove the bottom cover in order to get in there & smooth out the inlets of the runners (if not already done by previous owner). Check port alignment to the heads & align any steps between the runners. Also, don't forget to open the inlet to 85mm.
As to the diablosport, I am not familiar with it. If it allows you to log your idle STFT's in order to tune your MAF table, then it can work. Although, I don't think it does. Am thinking that a dyno tune w/ a tuner that will first remove the MAF in order to tune SD & then calibrate the MAF table & tweak the VE & PE files accordingly, is your best bet. Other option would be to buy tuning software & a wide band & go at it yourself. A proper tune is a must & you woun't be dissapointed w/ the 85mm set-up.
Staging Lane
Joined: Jul 2008
Posts: 71
Likes: 0
From: Denver, CO
Yes, in the context that we are speaking, stock 78mm, the inlet is typically & is most definately the restriction. We are discussing the benefits of an 85mm TB & MAF on a ported Weiand. Nowhere have we discussed 90mm top of the line alternatives. If we were talking 90mm, an LS6 & its' runner wouldn't even be part of the conversation.
You are also wrong in that the LS1/LS6 is 75mm, not 78mm. I would say most people 90%+ should not be doing any port work on their intake as they would likely hurt the flow. In stock form I would take the LS6 over the 85mm manifolds. They perform just as well, are cheaper, and lighter.
If your recommendation is a ported 85mm intake, I consider that just slightly less expensive than a Fast setup that will greatly outperform it.
Bigger is not always better. Alot of the time it's just marketing so people like you believe it's better.
Read the flow tests in the stickies...JR. I also have tuning software & can measure the airflow produced on any set-up installed on my car. So, if this factual, measured data is what you are referencing when you state that my comments are merely "My opinion", then you would be correct.
Staging Lane
Joined: Jul 2008
Posts: 71
Likes: 0
From: Denver, CO
Read the flow tests in the stickies...JR. I also have tuning software & can measure the airflow produced on any set-up installed on my car. So, if this factual, measured data is what you are referencing when you state that my comments are merely "My opinion", then you would be correct.
