03 BUSA

iTrader: (25)

Going solid roller NA 427. Will be a 50/50 car. I thought I would do a Fast 92 setup but the more I search it seems that it might be a restiction on a NA build. Don't get me wrong the Fast setup is much cheaper but at the same time I don't want to spend the money on a Fast if I will just be swapping to the sheetmetal in the future. I want to do this build right the first time and not look back. I was going to make this thread a poll but I knew people would vote on the sheetmetal without actually owning one or knowing the real effects. Wanted some thoughts and opinions on what you are running with your NA big ci builds. Thanks guys.

aNuBiS

iTrader: (25)

Well I have an n/a 418ci solid roller ls3. I have a ported fast 90/90 and put down 522rwhp thru small 1-3/4" headers in an automatic with a big stall and ford 9" rear-end. Do I think I could make more with a sheetmetal, yes.

Question is, are you willing to sacrifice some low end torque for some high rpm horsepower.

03 BUSA

iTrader: (25)

Well sure there would be a trade off for more pk hp but also I think the sheetmetal would allow the motor to turn farther as well. Question is how far does the fast allow the motor to turn? I think a sheetmetal would net in the low 7k's. Not real sure but would a fast allow that?

aNuBiS

iTrader: (25)

I shift at 7000rpm(peak) and the motor holds good 7500rpm. I want to pick it up higher and raise the peak.

03 BUSA

iTrader: (25)

So for a weekend street driven toy that I could take to the track and shift at 7200 the fast would work for my application? Thanks again for the help. I am looking at a Fast 92/Beck and the new Fibertuned intake once long runners are avail. I won't be in the market till sometime in Jan but trying to get all the research done now so I have a plan.

2000_SS

iTrader: (24)

the FAST will definately have to be ported, or it will be a waste of money to an extent.

03 BUSA

iTrader: (25)

See in my opinion that would make it a waste, by the time you put the time and money into having it ported I would rather dish out the 1650 for the new fiber tuned intake with long runners and be done.

2000_SS

iTrader: (24)

that's precisely what i'm doing, but i have sheer cubic inches to feed (454) and it's not that a FAST won't work, it's just that the fiber-tuned intake will, presumably, do better. the power loss down low will be minimal and due to the physical size of the motor, it won't be noticeable. it'll be traction control if anything else.

...but on the other hand, i wouldn't put a FAST on anything without porting it, assuming the car has your other "typical" mods like cam, headers, etc...i do my own porting, so the gains are really worth the cost - which is just a saturday afternoon in my case.

03 BUSA

iTrader: (25)

You getting the short runners or waiting for the long runners to come out?

yelnatsch517

Fibertune intake suffer from heat soak?

03 BUSA

iTrader: (25)

No, hence the fiber runners to dissapate heat better that a 1 piece sheetmetal.

tektrans

iTrader: (23)

If it does it should be alot less than an intake that's all metal. I'm thinking the carbon runners will help alot with that.

2000_SS

iTrader: (24)

i'm sticking with short for now. no need to maximize a 454cid motor in a 'mostly' street car...the cam is already spec'd & ground for this one anyway.

03 BUSA

iTrader: (25)

I think your backwards or I am. I thought the short runners were for high rpm like 8500 and so and really kills low end vs the long runners for some street use and minimal low end loss. Atleast that's what I got from talking with Nitrous Dave tonight.

2000_SS

iTrader: (24)

may be...

either way, i'm going to order whatever is available when i'm ready to order...not exactly the best philosophy when building an engine, but the one that is out now, is what my cam is spec'd for. the car it's going on isn't a racer or a DD...just a toy...a violent, nasty toy

98Z28CobraKiller

iTrader: (17)

The FAST intake typically peaks out at 6400 RPM on most hydraulic application builds that I have seen. We engine dyno'd a new solid roller 427 LSX block that we just put together. The peak carried to 6800 RPM (but this is a REALLY big cam). I dont have alot of experience with the engine dyno so I dont know exactly how this will translate to peak numbers on the rollers. On the engine dyno, you have nothing in front of the TB. IMO, there is no point in incurring the additional expense of building a solid roller setup if you dont intend on spinning it over 7500RPM. If the Fast stalls out at 6400 RPM (go in the dyno section and look at some graphs, that's about it for the FAST), there is no point in spinning it higher than 7K.

Another thing that I noticed is that none of the guys that are going 9's NA are running FAST intakes unless the cars weigh less than 3100 lbs.

So I personally think that the FAST is not for you. I need to sell mine cuase it's not for me either.

SOMbitch

iTrader: (8)

Edelbrock just debuted a short runner intake at SEMA and are making some pretty bold claims. May want to look into it before you make your decision. It is scheduled for a January release and is only in the $400 range.

aNuBiS

iTrader: (25)

I was under the impression that one didnt clear factory fbody hoods...

BigRich954RR

iTrader: (1)

Id stay the fiber tuned intake might be better for you. I dont think you being giving to much up in the low end par with a soild rolle.

blackonblack02_Z

iTrader: (6)

So what intake, or intakes would be preferred for a 427ci engine turning 8500 in a 3600lb car?