schino

iTrader: (14)

you can call me crazy, yes im sure its overkill, but i want to see what these little 4.8's can do under pressure from an F series...
motors going to be ly2, stock rotating assembly with opened ring gap, blower brackets will be one off custom and ill be running it cogged. the truck gets occasional street use, once twice a week just for play, its not my DD.
im trying to think what i want to do for the rest of the motor. cant decide on stock heads/ intake or going aftermarket on both. im thinking i could only get about 20#'s on the 799's with studs and ls9 gaskets before i run into problems. if i throw on something like afr heads i know i could make more power with less boost. please discuss, what do you think gains would be 20# on stock heads/intake vs 20# on aftermarket. my fear of going aftermarket is destroying them when the motor DOES decide to **** itself

bad6as

iTrader: (17)

Be better off w/ a d1 imo, that f1 is too much on that. 4.8.

schino

iTrader: (14)

Not trying to be a smart *** by why do you say that? They say base hp of 375-500 I think the motor would fall into the lower end of the range. I know d1sc can make a lot but the 4.8 may be getting replaced by something like the aes 390 one day. Plus I want to run a cog drive and as far as I know you can't do that on them

ajrothm

It should be fun and make good power... atleast until it lifts the heads....

Atleast with the 4.8 you can spin the **** out of it. I would put some good springs/push rods in it, and a decent cam would help as well..... Spin it to 7000-7200 or so... That will get you close to the sweet spot of an F1R... (7.65 crank, 4.00 blower, 7000 rpms = 72,300 impeller)... Just a bit past the max rated 68k.... You'll need it pullied like this to bring the blower in sooner..

I could see you making 750hp or so....maybe more... atleast until it goes

94 slow

Do it! When the project is complete, please post video. I would also like to see what it does on the dyno.

Frans96SS

iTrader: (15)

Let me know when you are ready for the blower. Ill hook you up. You could also do an F1D. Has a better ratio for something not set on kill

schino

iTrader: (14)

i think lifting the heads is going to be the determining factor on how much its able to put down. id believe that 700-750 is possible thru a locked 4l80 and what i want to shoot for. it will definately get good springs push rods and cam in it and i was thinking around 7000 rpm. if its really low on boost down low i could always pulley it harder and run a boost controller to bleed off up top

fran i like things that are set on kill haha. i just picked up the blower over the weekend, it was a dyno time only head unit so ill be fabbing up everything for it. i prob would have gone with a D or A had i bought new, i just spur of the moment bought myself a birthday present. ill hit you guys up if im needing to buy any other new parts for it.

anyone know the official/unofficial "record" of a supercharged 4.8?

helga203

I believe you'll be the first. Good luck.

ajrothm

Its not gonna be low on boost....LOL The pulley combo I gave you will bring the boost in early... Especially on a small motor like that, it may be more boost then you want..

I run a 8" crank, 4.25" blower and I see 23 psi or so at 6500-6600..... On the dyno I would see 8 psi at 3500 then it starts coming on hard after that, 11 psi at 3600 and climb up to 20 psi by 6500... This was thru the air filter/air inlet piping which was killing about 2.5 psi.

A smaller motor is gonna show even more boost...(more restriction).... You'll just have to play with pulley combos and see where you end up.

Mine makes more boost then it should for the pulley combo, I think this is due to my really small cam, causing the intake restriction. I will probably do a cam swap at some point and figure it will pick up 50rwhp and drop boost to 18-19 psi or so, with the same pulley combo..

Blowers are a different animal from turbos, thats for sure.. Personally I think you can get out much cheaper on your 4.8 if you went to a home brew turbo setup, make the same power and have better control over the boost.. But It will be cool to see what you do with the F1R setup..

eb02z06

iTrader: (18)

I've done several combo's 950 plus on 4 bolt Patriot 317's. Keep the IAT's down and you won't have a problem with head sealing.

Pro Stock John

iTrader: (34)

I had an 8:1 348 + Vortech YSi, despite belt silppage went 9.4@145. That was off the transbrake leaving at 4500 though.

hellbents10

iTrader: (10)

Should be fun, and I would worry more about the rods then the heads lol!

schino

iTrader: (14)

good info guys. i guess ill save the money for heads and invest in nice valvetrain. and about those pesky rods. i think ill be buying an engine diaper so when the rods get fed up with staying inside the motor i dont put my truck into the wall.

about going turbo being cheaper. im sure i could do a setup real cheap, build one for what i could sell my tvs setup for but everyone turbos the 4.8 i want to be a little creative and make a whole new front setup on the motor and add it to my list of products i should be making haha. plan on seeing some sort of billet motor plate/supercharger bracket with crank support when finished

allout06

iTrader: (11)

in for grenade aftermath pics

Bob@BruteSpeed

iTrader: (16)

This will be interesting for sure! The F-1R eats up a lot of power, much more than an F-1A would, but it is what it is. Bob

BLWN1

iTrader: (6)

So bob will the f1a make more power up top ?

I8UR4RD

iTrader: (16)

makes two of us. I think peolpe will be surprised how long it will live. I would sell the 799s and grab some 317's. No reason not to since they flow a ton more air and are cheap and easy to come by.

BLWN1

iTrader: (6)

Will they?

helga203

SSSOOOOOOO Any updates????????

droksformula

iTrader: (18)

Theres a guy on yellowbullet who made over 1200 on a f1x with a 5.3. Not sure how long it would last but thats pretty wild!