Nanner6

So just as the title says. I built the car last year and I'm looking to get more power out of it. It currently makes 806whp on a Dynojet running 18.5 lbs of boost. There are definitely ways I can get more power like a smaller pulley and a race gas tune. My only concern is will my motor hold it or am I kind of maxed out and pushing my luck for an aluminum block.

Heres my build list.

Texas Speed & Performance Custom Built 402 CID
-Callies Compstar 4.00" Stroke Crankshaft 58x Reluctor LS2
-Wiseco Forged LS2 Piston Set 4.005' Bore -15cc
-Wrist Pins and Steel Top/Napier Second Ring Set
-ARP Main Stud Kit
-Durabond Cam Bearing Set
-Clevite H-Series Main Bearing Set
-Clevite H-Series Rod Bearing Set
-Callies Compstar 6.125" H-Beam Connecting Rod Set
-GM 58X Reluctor Wheel

PRC LQ9 2.5 CNC Stage 2 Heads
-Manley 1.575" Stainless Steel Exh Valve
-Manley 2.02" Stainless Steel Int Valve
-LQ9 317 Castings
Brian Tooley Racing .660" Lift Dual Spring Kit with Titanium Retainers
LS2 "ECS Big Blower" Cam
ARP Head Stud Kit 04+ LSx
Mellings High Volume Oil Pump


Paxton 2200 Head Unit, Reverse Rotation, Oil-Fed Heavy Duty Black
Unit
Alky Control Upgrade to dual nozzle (Parts only)
Paxton 8 rib 3" pulley for C6 (small shaft single key 1500/2200HU)
FIC Bosch 850cc Injectors 8
Mantic 9000 Series Twin Clutch Kit with Flywheel & Slave Cylinder,
T6060 Tranzilla swap

Ls240sx

Let'r rip. You will run out of injector before that motor. I dont know what max rpm is for that head unit but that would be another consideration.

DOUG @ ECS

With the 3" head unit pulley you are basically maxed on RPM, you could upgrade to a 2200R/X, but we also recommend going to a ten rib set up then too. Although that is a big added expense, I bet your set up would sell quickly and I will give you a great deal on your upgrades. Just some food for thought, 20+ lbs of boost FTW!

Dude_man

If the builder is good, i would push that over 1000Whp all day.

95vettski

What size balancer do you have?

That combo should be able to make over 900 hp. As for reliability, I think you should be fine at that power level, although some people have reported problems with the compstar crank flexing.

realcanuk

I would worry more about the crank than the block if pushing that more.

Nanner6

Yea my old motor cracked a sleeve and now I'm just always afraid that's my weak point. I thought those Compstar cranks can hold a bit of power. Guess I have to look into them a little more.

TTBlueZ06

Yup, I don't trust those compstar cranks for nothing...
Weakest link in that build.

Nanner6

You guys actually built my car, but damn I thought I can squeak some more out of this head unit. Whats your opinion on everything else in the motor? Is it worth me upgrading and doing the race gas tune? Or am I asking to grenade this motor and just be happy with what I have?

Nanner6

Which do you like best?

DOUG @ ECS

We do not use the Comp star cranks as far as I can ever remember? Did we do the engine build?

That said, either way the 2200 is usually good to 850/900 RWHP. So I guess you should be able to bump it up some.

TTBlueZ06

K1 Technologies for the cheaper ones... Better crank than Compstar in my and many others opinion. Seen lots of broken compstars.


But I prefer to use Dragonslayers or better for anything that makes real power. (1000+)

Nanner6

I actually made 865whp on your dyno, so I guess you're right im pretty maxed out if its good until 900. I know you guys ordered the motor from Texas Speed, but I'm pretty sure it came as a short block and was already built.

Mike Farris

What's everyone's opinion on the power limit of the 4" stroke compstar cranks? I'm looking to max out my D1 on my 408. I always heard they're ok with anything under what a ysi or f series blower can make.

TTBlueZ06

I honestly don't trust them at all, I wouldn't sell them to a customer or run them in anything I personally own.

DOUG @ ECS

PM me your name/info and I'll see if i can go back into records and see what you have in there. Like I said, we do not usually use them unless specifically requested by the customer.

newvetteguy9

This kinda concerns me I was going to step up to the 2200 from my 1500, but I already make more than 840whp on the 1500 and doesn't appear the 2200 will really give me much more room up top...