Supporting parts for cpt 70bb ptrim

[GBGN1]

Im getting my old car back WE4 (stock longblock)There is a new 70bbp on it now.I know this turbo is way to big for the stock heads.Im in the process of getting together a nice built long block for it right now.---What is needed to take full advantage of this turbo?Headwise & camwise?--Street/strip car..Ive got a 3200 stall in it now and building a stroker short block for it( car has a V-1 intercooler,all 3 inch exhaust,and fuel upgrades already)
Thanks

Any input would be great

 

[49-blues]

Im putting mine on a stage2 gn1 headed stroker 274" with a 224/224 roller cam and 3500 stall with 120 lb injectors on E-85.

 

[bison]

A really good set of ported heads/intake with some big springs on them, strong bottom end, 9.5:1, decent cam, really really good converter, extensive mods to the rest of the drivetrain to make it deal with the power, and lots of boost. You may need more fuel system than you already have. Plan on running an external gate with some type of external pressure source to be able to run some boost. At 35psi it should crank out 750+whp with conservative timing. Most have a hard time going over 600whp since they are lacking critical parts. An aftermarket ecu like FAST makes a combo like this a lot easier to dial in on a dyno.

 

[GBGN1]

Thanks for the heads up.
Bottom end -
3.625 BA Crank,K1 Rods,Wiseco pistons.Girdled 109.

Cam.. was looking at comp 218-212 roller

Heads..looking at Gn1's,80 lbers,2 pumps
stock computer

Was looking for 650 whp.Maybe turbo too big
At 35 lbs of boost im thinken the heads will lift right off the engine.:frown:
I want to be able to drive it on the street also and not be a bear

Thanks for the thoughts again

 

[bison]

Thanks for the heads up.
Bottom end -
3.625 BA Crank,K1 Rods,Wiseco pistons.Girdled 109.

Cam.. was looking at comp 218-212 roller

Heads..looking at Gn1's,80 lbers,2 pumps
stock computer

Was looking for 650 whp.Maybe turbo too big
At 35 lbs of boost im thinken the heads will lift right off the engine.:frown:
I want to be able to drive it on the street also and not be a bear

Thanks for the thoughts again

With a porter set of aluminum heads you should hit 650whp around 23psi.

 

[murphster]

Bison is right on. Very similar to my combo in my white T. I've run 131mph at 22lbs of boost at around 3650-3700 weight.

CPT70 turbo, stock GN1s, 224/224 roller cam, Eagle crank, K1 rods, Wiseco pistons, T&D rockers, billet mains, 83lbers, double pumper, Precision plenum/Accufab TB with power plate, Cottons FMIC, ATR 3" dual exhaust, 3.5" downpipe with external gate run off of TA headers. Running an MSBC electronic boost controller with CO2. Trans is a Rossler TH400 with a Neal Chance converter. Fuel line upgraded to -8 dual feeding Champion fuel rails with an external FP regulator. And have a Denny's 3.5" 1350 Driveshaft setup with upgraded yokes, 30 spline Moser axles and spool. Running a stock computer on pump gas and alky.

So, these are the kind of things you would need to do to make use of the power. I'm not running to the potential of the turbo, but I have most things in place to do it. To get the most out of the setup I'd probably need an external fuel cell and pump plus XFI.

 

[GBGN1]

Great Info guys!!!:biggrin: Murphster,at your current configuration is there still room for more boost or is there a limiting factor (fuel like you were saying)?Is the double pumper have enough volume for 9.**'s?Thanks

 

[murphster]

Once you can get into the high 9s some say its time to go external pump. With an upgraded fuel line a little faster is ok. A lot of the limitations could be from the stock single fuel rail feed with the inline regulator that leads to leaning out #1. I'm dual feeding Champion fuel rails with an external fuel pressure regulator, a setup which has gone low 9s.

Also, there is a question of reliability of making sure the second pump is working correctly that people worry about at that power level. With a non working second pump you'll go lean, where as if one large external pump fails you won't have any fuel (of course, if you are running alky that wouldn't be good either since alky would keep running and you'd be really lean with alky as the only fuel. Most people are just running race gas at that power level though).

I would think my car is capable of going 9.6-9.7 or so with more boost.