stroker power curve

[sdryde]

.060 bore
10.25 cr
.054 head gasket
zero decked
24lb injectors
stock renix fuel pessure reg
comp cam
comp lifters
mopar spings and retainers
7120 head
99+ intake
gasket matched
STOCK renix tb
renix computer

33" tire
4.88:1 gears spooled


I took it for a test drive and the power from idle to 3000 rpm is great after that the power curve 100% flattens out.

from a stop I floor it, it lets loose for 15 feet, I felt I needed to shift so I did and then I look down at the tach and it only at 3500.

I think:
#1 the stock tb is restricting air flow so power can not be produced abow 3k rpm
OR
#2 when I wired the injectors i got some of the injector plugs crossed up


What do you guys think?

 

[AIbandit]

The renix TB is tiny I would start with that.
I personally would adapt a bored 91+
http://www.strokedjeep.com/renix t-body.html

 

[xj-grin]

I agree, more air -- mine is a 62mm, and even at altitude, if anything, I actually think mine starts pulling harder at 3k -- I rarely take it over 3500 anyways, however, since we're not dealing with a hi-taching race motor, its a low end torque grunt motor.

 

[BlueCuda]

I guess mine is backwards, its decent below 3k and at 3500 it comes alive up to the shift point. Its a very peaky power curve. For this reason I really want to build a long rod stroker but won't have the chance for some time.

BTW my setup is the classic budget stroker with the crane 753901 cam and FMS 24lb injectors. Stock valve springs(225K onthem) and TB.

 

[old_man]

Your torque curve is almost entirely dependant on the cam.

 

[BlueCuda]

Agreed, I think the longer 4.0 rod will help it flatten the curve some as well.

 

[Dr. Dyno]

I took it for a test drive and the power from idle to 3000 rpm is great after that the power curve 100% flattens out.

from a stop I floor it, it lets loose for 15 feet, I felt I needed to shift so I did and then I look down at the tach and it only at 3500.

I think:
#1 the stock tb is restricting air flow so power can not be produced abow 3k rpm
OR
#2 when I wired the injectors i got some of the injector plugs crossed up

What do you guys think?

The Renix TB (only 51mm) is definitely strangling your engine so you'll notice a big difference if you swap in a 62mm HO TB. Make sure you have a decent 3" diameter airpipe with smooth walls (you can find silicone tubing with a 90 degree elbow very easily) and a good sized conical air filter that's shielded from underhood heat.
Right now your engine is trying to breathe through a straw.

 

[Comanche Devil]

What about fuel pressure. Your post says stock Renix fuel pressure regulator which is 31psi, those ford 24# injectors need 49psi to flow correctly dont they?

 

[gradon]

The blue tops are rated 24#@39psi. The newer cobra injectors are rated higher.

 

[Comanche Devil]

The blue tops are rated 24#@39psi. The newer cobra injectors are rated higher.

Yup 39psi sorry for that didn't proofread befor sending.
Anyhow if your not getting enough fuel pressure it will be leanand fall flat after takeoff.

 

[Talyn]

What is your air to fuel ratio like?