jimbjr

This thing is not cheap, but states some big claims. I was wondering if this was discussed already. I couldn't find it through the search.

I know I have a C4, just looking out for fellow enthusiasts.
http://www.nitrouswarehouse.com/ls-spyder.htm

:D

BlackTieC5

Is that a good price for 50hp ?

robsvette

3200.!!!!! :eek: i believe mr. stewart is on crack :crazy: i'm curious to know who would give that kind of money away for an intake manifold. they would have to be :crazy:

glen5839

Ive seen several of these aluminum manifolds tested. One on my car in fact. Unless this particular design is completely different than all of the others, I'd say keep your money. 3+ grand for 50 horsepower is a little extreme, even if it will make the horsepower it claims (and in my experiences it won't).

I have never seen one of these type of manifolds add power to a car. The only increases the manifold made were on nitrous applications.


[Modified by glen5839, 7:54 PM 8/23/2001]

Avanti

A lot for a Chevy manifold, any Chevy manifold, but compared to my friend's Anniversary Contach intake replacement at $13,000 (no mistype) WHAT A BARGAIN! I'll pass, anyway.

STEALTH C-5

If the designer wants to demonstrate this 50HP gain on an independent dyno and independent heads and cam and stroker motor car maybe at a big show in front of a bunch of people and than go out and back it up on the track with at least a 3.5 to 5 mph gain in trap speed and lower the price at least 1,000.00 dollars he might sell some.

pkmoose

ummmm lets see here
$900 for a cat back exhaust
$12000 for a supercharger installed
$1000 for headers
$6000 for heads and cam installed

need I go on??????

intel55

Supposedly SAM Racing is trying it out. It is NOT Stewarts manifold. He has NEVER given out dyno numbers. I would try for about $1000, but.......


He needs to back up his claims and do some tests. Hogan makes similar manifolds for about $500 +/- cheaper.

Would be a nice addition to a 427 if the price was at leat 50%+ lower. :cry

CRUZMISL

At $64/hp, if in factthe 50 HP claim is true I'd pay it. That's pretty cheap and easy HP. You don't even have to open the motor. I remember I paid $2400 for a variable intake on my VW Golf a few years back and I only got 15HP:eek: Has anyone phoned to see if they'll back the claims with a dyno run?

Joe

mikeyc6

I've found that most mods that do nothing more than open up the intake a bit:

(1) Don't make nearly the HP claimed. They work. I've just never been able to verify the (overstated) claims. That goes for any/all intake mods I've seen including the cold air intakes, etc.

(2) Only increase power above about 4500 RPM. The stock system flows well enough below about 4500 RPM that you could put a manifold and ductwork the size of a 50 gallon garbage can in there and it'll still be 4500 RPM before you see any gains because below that, increases in efficiency over the stock stuff is minimal/negligible. At lower RPM, our intakes are the equivalent of running water from a garden hose through a 3 foot sewer pipe. Increasing to a 4 foot sewer pipe really isn't going to change anything. ;)

Just my experience.

Mike

chuckoc

Bingo Mike, It also in all likely hood hurts low end Trq. where you need it most when in the real world, The street.. It should slow down intake velocity and as such hurt low end as I said, Intake velocity should not be overlooked.

dbvettez06

You are right it 'STATES" some big claims..Sounds like a lot of :bs to me...You know anything that sounds too good to be true........ :smash:

Peach

I just spoke to this guy...he's off the wall. It does not work below 6000rpm


[Modified by Peach, 11:51 AM 8/24/2001]

SDVette

Take a look at my post http://forums.corvetteforum.com/zerothread?id=139409). This is a 98, but look at the picture of the rear of the stock air box. I don't think a 3-foot sewer pipe comes to mind!

That said, 50hp is a rediculous claim!

glen5839

Like I said I have seen 3 of these type of intakes dyno'd and they actually lose hp on the dyno under all motor applications.

You don't even want to know how much torque they lost!!! :eek:

The ONLY gains were high RPM nitrous applications.

mikeyc6

Everything is relative. Even with the stock small-opening-airbox, you will never approach any type of limitation in flow until above 4500 RPM. There is a common misconception that you need huge 6 inch, smooth/ported intake pieces or you will choke your engine. The simple fact is, below about 4500 RPM or so, you don't even need anything as big as the stock inlet/piping because the engine just isn't sucking enough air to cause a significant pressure drop. In the higher RPM, especially above 5,000 RPM, it's a different story so these intake mods are good for opening up the high end. The (unfortunate) fact of less restrictive intake mods is that you can bolt on intake pieces as big as you want; they aren't going to do Jack below 4500 RPM.

I still think a decent intake like the Blackwing is a good investment because there is life above 4500 RPM. I just think that people overestimate the claims and not many people realize that these are high RPM mods only. Lack of benefit at lower (<4500) RPM was the reason for the sewer pipe analogy.

Mike

SDVette

O.K. I'm a software guy too :rolleyes: but here's my calculation:

350 cubic inches of air are required every 2 revolutions of the engine.

That equates to .101 cubic feet every revolution, so at 3000 RPM, it's just over 300 cubic feet per minute, or 5 cubic feet per second.

Seems like a lot to be going through 4 dime-sized holes! But I'm no automotive engineer, although I did sleep at a Holiday Inn Express last night :D

99 Corvette

Good calculations SDVette, but that is assuming that you are getting 100% volumetric efficiency. Which the way I understand it is almost impossible without forced induction.

Jerry

Chris@SD

I can't say for the final dyno on the SAM racing camaro, but the last one I heard (from my engine builder and former student) was it picked up about 5 RWHP on the top end...
It does look pretty trick though.

mikeyc6

True! I think that's why cams help a lot more than intake pieces. You might get 80% volumetric efficiency so that 5 might be closer to 4 cubic feet per second. That equates to a box of air that is 1.6 feet on each side getting sucked into the engine every second. Not a huge amount to go through the stock intake system I don't think, but it does seem like a lot to be going past 4 partially open valve holes.

Mike