Blackbird-WS6

iTrader: (15)

I have a 408 with TX giant cam and AFR 225 heads with a FAST 90/90, my peak power is at 6200rpms making 506rwhp on a mustang dyno thru a 9inch/M6 car

Does that sound about right?? Just want to make sure I'm not having valve float

redtan

iTrader: (5)

What are the specs on the cam? Just by the name it sounds like a big donkey dick cam.

With that, I would assume your peak power to be significantly higher than 6200rpm.

Blackbird-WS6

iTrader: (15)

Cam specs... 248/254, .615"/.622", 112LSA

BrianSF-GA

That is making great power through a 9/M6 on a Mustang ... congrats. I wish I could pull that kind of power with an S60/M6 on a Mustang (same numbers, but on a DynoJet w/ the 10-bolt), but I am sure my TFS215's are holding me back. What is your peak torque number and what are your head flows if you have them?

Blackbird-WS6

iTrader: (15)

thanks... im also running a PST 3inch steel drive shaft, A/C, nothing was deleted

im most likely leaving roughly 10-15rwhp on the table with the FAST 90 vs FAST 102 and 104 lid with bigger tubing from the 104 lid to 102 TB

iv seen some people make good power with cnc ported ls6 heads so your TFS 215 shouldnt be a problem

have to check my TQ numbers, dont remember offhand

im just wondering if my RPMs are low do to valve float more or less, what does your rpm peak at??

Blackbird-WS6

iTrader: (15)

ttt...

litle88

iTrader: (20)

What springs are you running?

Blackbird-WS6

iTrader: (15)

brand new set of PRC 650lift double springs

BrianSF-GA

I am running a Strange 3" chromoly drive shaft with 1350 yoke and u-joints, a/c as well and nothing deleted.

My FAST 90 is Vengeance ported and I am not so convinced a 102/102 is the answer. Virtually every test I have seen here they drop torque and 500 rwtq is not something I want to sacrafice. i am running a Direct Flow LS1 Motorsports lid, but i don't know what they flow.

I am happy with my heads ... they flowed good numbers:

0.100... 59.6... 68.3
0.200...121.9...139.8
0.300...186.7...218.5
0.400...231.4...270.9
0.500...254.2...304.3
0.550...260.2...314.8
0.600...266.1...321.8

but, I too wonder what I am leaving on the table not having an LS2 head like a TFS 225 for a 4" bore and slightly better flow numbers. My DyoJet numbers peak at 5,710-6150 rpm at 508 rwhp and steadily drop to 470 rwhp at 6,800 rpm. My torque is what I love best about my motor .... it peaks at 497 rwtq at 4,650-4,750 rpm. Keep in mind those numbers are with a 10-bolt, so I imagine I am down 10-15 from those numbers with my S60.

Blackbird-WS6

iTrader: (15)

yea thats the reason why i didnt swap out my intake, i dont know if i want to chance it

nothing is ported on my motor (heads or intake)

BrianSF-GA

My main concern right now is getting mine to hook with a goal of dipping into the 6's/10's. I just finished a rear coil over install and have a 2-Step and LL to do next. It will be a while for me to concentrate on the motor, but if I do, I may go to a Vengeance-ported FAST 92, TFS CNC 225's and 1-7/8" headers. That would be a chunk of money and I am not sure the gains would be worth it. A roll bar, Tick T-56 build, Tick MC and bellhousing are in my future first.

Blackbird-WS6

iTrader: (15)

did you dyno your car before you ported your fast 90??

what are your 1/4 times the way your car sits??

BrianSF-GA

No ... the numbers are as the motor sits now. I dyno'd it recently at a local dyno day (not Vengeance's), but the humidity was terrible .... it made 471rwhp/464rwtq which I think is a bit light by about 25 rwhp/rwtq or so.

I have not had it to the 1/4 yet, but it ran 7.5's in the 1/8 at 103-106 spinning well past the tree ..... I have a thread here with some vids ... the mph is there for 6's. I am planning to attend a track day at the end of the month which is a 1/4 ... remember, I have no cage for the NHRA/IHRA tracks like Atlanta (Commerce) Dragway.

87silverbullet

iTrader: (11)

There are guys running FAST 102's on stock cube motors and running wicked fast.

With your cubes I would still go Fast 102 and a set of 225 trickflows.

BrianSF-GA

Oh, how I would love to go to TFS CNC 225's, but my budget is about busted (I have already gone over what the wife initially agreed too). Front coil overs are probably the last investment I will be making for awhile, but I am thinking it will be in the 6's/10's as she sits. What good is more power if I cannot put down? I also want to upgrade my VROD to a Street Glide and the wife wants a beach house.

Mazzenger

iTrader: (5)

I don't think your FAST 90/90 is holding you back much at all.
I would take beach house over the FAST 102!

By the way my 408ci sees peak HP around 6200-6300 rpm and
sees peak TQ around 4500-5000 rpm.

Blackbird-WS6

iTrader: (15)

what is your 408 making? hp/tq (rearend/trans) edit... i see your on a dynojet with a 10bolt (saw your thread)

mine should be 530+rwhp with a 9inch on a dynojet at the very least


thanks for all the info guys

Mazzenger

iTrader: (5)

Your car is showing good power numbers.

Not sure if you are having valve float? If you upgraded to the 8019 spring then the chances of valve float is decreased.

gectek

iTrader: (2)

Unless you got some special heads, all the AFRs are cncd as far as I know.

Even with that intake combo and heads, your cam is what is going to determine where your power is. With that low of an LSA, I would say your peak power is about right. If you switched to the 102 combo, there is not a single doubt you would pick up power, but honestly if you chose a better cam, it would pick up as well. There is such a thing as having the wrong cam for your intended goals.

Blackbird-WS6

iTrader: (15)

Thank you sir, I will look into the other springs but from what I'm seeing I should be find
What I meant with the heads is there not ported by tony or anyone else.... Just bc they are cnc doesn't mean they can't be ported

It's making power where i want it, I just wanted to make sure I wasnt having valve float thats all, even if you compare my numbers to the list of other 408s I'm on the higher end, I'm just up and down about the intake