Gforce Engineering

iTrader: (2)

This whole truck exhaust manifold thing really has me intrigued.
I've read about guys making 800-900 and a little over 1000 hp with the truck manifolds.
Just wondering what the most power people have made with them.

Has anyone switched from truck manifolds to custom built headers after making big power with the truck manifolds to see what kind of power increase there was?

I'm slowly building my turbo set-up with a billet 94mm and I'm down to header fabbing.
Building headers isnt that big of a deal but if the truck manifolds will work then why not use them.

I'm looking for around 1300 rwhp from this build.


Thanks
Chris

02SSLE

iTrader: (26)

I think the Ohio Boys are using 6.0 manifolds making 2000 HP or close.

1320

iTrader: (6)

Mike Brown went 202 mph.......at around 3600lbs..

Gforce Engineering

iTrader: (2)

Wow, those are impressive #'s on truck manifolds.. keep em coming

tim99ws6

iTrader: (31)

Mike Browns car is 6.0
Mark Kohler's car is 6.0

both are well in excess of 1750rwhp and 200mph capable cars. That's about all that needs to be said in terms of "do 6.0 manifolds work". hahaha

427

iTrader: (3)

I think Mark is the only one that has been on a chassis roll with his "Ohio boys" car. He made 1300hp with his 6 litre engine last year in full boost mode, this year he ran a 1000hp average on 15psi.

Kurt

tim99ws6

iTrader: (31)

Doesn't he kick around in the upper 20's with the current motor you helped him with?

I think i need to talk to you about your distributor setup...hahaha

427

iTrader: (3)

He is running a little over 30psi in his quarter mile runs. He would run more if he could, but he is out of turbo and the MLS head gaskets are crying now!We will be upgrading a few things this year when it comes back for freshen up, but the basic combo will stay intact.

Kurt

2001WS6Vert

I think Mark was the last car to go on the dyno challenge and he just had to top high 700 rwhp range to win. That's why he only went to 15 lbs. I see all these cars with tubular headers that only gets bottle necked with the relatively small T6 turbo entrance. That to me + the heat holding of cast pieces seem to me to be the reason that they don't seem to do any better than the truck manifold setup, my .02.

Shearer

Truck manifolds work and are capable of sustaining quite a bit of power. However there are gains to be had by switching to a proper tubular set-up.

Tiago

iTrader: (27)

700 rwhp won the dyno challange? wtf....

2001WS6Vert

That was where it was at until Mark pulled 990 rwhp to win it. He obviously could have put more down but I guess didn't want to stress the car?

Gforce Engineering

iTrader: (2)

So it sounds like 1300-1500 hp wont be a problem.
Thanks for the input guys!

Chris

Pro Stock John

iTrader: (34)

867rwhp, 25psi, lil old tired 8:1 348 cid

86cutlass350

my question is what are they doing just blocking off the egr port on the one side or?

Tally TransAm

iTrader: (17)

the ones i have dont have any emissions ports

tim99ws6

iTrader: (31)

Same here, mine have no ports. Just gotta get the right ones 86Cutlass.

chasgiv3

iTrader: (1)

882RWHP on an LQ4 block 408CI at 19PSI through a TH400 with a 4000 stall.

BlwnTA

iTrader: (18)

I don't think we really know where the limit is yet. I'm making around 1850-1900bhp and Mike Brown is closer to 2000bhp or maybe more. As far as I know, we are only ones that pushed them that far and trust me, they will be pushed even harder next year .

Mark

Gforce Engineering

iTrader: (2)

You guys have supplied some great info in this thread!

Thanks
Chris