H/C cars making peak power around 6,700?

PRAY · 02-02-2018, 06:30 AM

I am looking for dyno graphs of H/C cars pulling to 7K and making peak power around 6,700 or above. I am trying to run down an issue. But most of the graphs I have seen have peak power around 6,300-6,500 and then falling off or hitting a dip and going flat. I would really like to see one of these 7,500rpm screamers I hear people talking about.

62nalide · 02-02-2018, 10:16 AM

It would also depend on the cam I am planning on spinning mine to 7500rpms on a pretty aggressive cam

Deakins · 02-02-2018, 01:20 PM

Well you really don't have the capability with the GM cylinder head casting to get the airflow needed to spin the engine all that high. Sure, you can cam it to the moon and get it there but you won't see it building good power. If you can't get a head into the 360 c.f. range you won't like the power curve of a NA unit above 7250. Jmho

PRAY · 02-02-2018, 01:30 PM

Quote:

Originally Posted by Deakins

Well you really don't have the capability with the GM cylinder head casting to get the airflow needed to spin the engine all that high. Sure, you can cam it to the moon and get it there but you won't see it building good power. If you can't get a head into the 360 c.f. range you won't like the power curve of a NA unit above 7250. Jmho

My ported heads flow 380/275 @ .600 lift. With my ported MSD/TB they flow in the 340 cfm range. So airflow isn't the issue. I am also not seeing a KPA drop up high. I am leaning towards valve float.

PRAY · 02-02-2018, 01:33 PM

Quote:

Originally Posted by 62nalide

It would also depend on the cam I am planning on spinning mine to 7500rpms on a pretty aggressive cam

The cams are decently aggressive I guess. Mid to high 220's/230's 111 lobe sep. 7* and 11* of over lap. In LS3's they pull to 7K.

PRAY · 02-02-2018, 01:40 PM

These are two different cams in 5th gear. The top is my STG 2 on a healthy motor. The bottom is the STG three cam but my motor is not healthy. It will be soon though.

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oldman · 02-02-2018, 01:52 PM

https://ls1tech.com/forums/generatio...yno-graph.html

http://www.hotrod.com/articles/how-t...-supercharger/

PRAY · 02-02-2018, 01:59 PM

Looking for some real world results at the wheels.

PRAY · 02-02-2018, 02:01 PM

This is a pretty small cam with ported Stock top end. It flattens out up top but doesn't fall off.

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DFW1LE · 02-02-2018, 05:51 PM

The max power on my little cam is 536 @ 6115. It does drop off around 6400.

JFM-jr · 02-02-2018, 09:45 PM

Quote:

Originally Posted by PRAY

This is a pretty small cam with ported Stock top end. It flattens out up top but doesn't fall off.

Attachment 918273

this car an A8?

wnta1ss · 02-03-2018, 05:44 AM

Quote:

Originally Posted by JFM-jr

this car an A8?

Graph says 1LE so that would mean M6 transmission

BradfordCamaro · 02-03-2018, 08:00 AM

Wish I could say mine did. I peak at 6K and it hangs there to about 6,700.
I could probably use a better Cam.

Missing out on 50hp

PRAY · 02-03-2018, 01:35 PM

I am going to give it one more shot with a different cam in my car.

02-02-2018, 06:30 AM	#1
PRAY Drives: 2016 2SS Join Date: Jul 2016 Location: Sanford NC Posts: 2,766	H/C cars making peak power around 6,700? I am looking for dyno graphs of H/C cars pulling to 7K and making peak power around 6,700 or above. I am trying to run down an issue. But most of the graphs I have seen have peak power around 6,300-6,500 and then falling off or hitting a dip and going flat. I would really like to see one of these 7,500rpm screamers I hear people talking about. __________________ 2016 2SS. H/C SBE 1.37 60ft, 6.36@109.49, 9.97@136+. Nuff Said.

02-02-2018, 10:16 AM	#2
62nalide Drives: 2013 SS Join Date: May 2013 Location: DFW Posts: 4,102	It would also depend on the cam I am planning on spinning mine to 7500rpms on a pretty aggressive cam __________________ https://frankensteined.net/ Martin@Frankensteined.net

02-02-2018, 01:40 PM	#6
PRAY Drives: 2016 2SS Join Date: Jul 2016 Location: Sanford NC Posts: 2,766	These are two different cams in 5th gear. The top is my STG 2 on a healthy motor. The bottom is the STG three cam but my motor is not healthy. It will be soon though. __________________ 2016 2SS. H/C SBE 1.37 60ft, 6.36@109.49, 9.97@136+. Nuff Said.

02-02-2018, 01:52 PM	#7
oldman Drives: SS 6 speed of course Join Date: Jan 2016 Location: Hilo, HI Posts: 4,320	https://ls1tech.com/forums/generatio...yno-graph.html http://www.hotrod.com/articles/how-t...-supercharger/ __________________ Forged short block, large duration sub .600 lift Cam Motion cam, 7200 RPM fuel cut, Pray Ported Heads, 3.85 pulley D1X, stage II intercooler, DSX secondary low side, DSX E85 sensor, Lingenfelter big bore 2.0 pump, ported front cats, 60608 Borla, LT4 injectors, ZL1 1LE driveshaft and Katech ported TB, ported MSD intake, BTR valvetrain, ARP studs, ProFlow valves, PS4 tires.

02-02-2018, 01:59 PM	#8
PRAY Drives: 2016 2SS Join Date: Jul 2016 Location: Sanford NC Posts: 2,766	Looking for some real world results at the wheels. __________________ 2016 2SS. H/C SBE 1.37 60ft, 6.36@109.49, 9.97@136+. Nuff Said.

02-02-2018, 01:20 PM	#3
Deakins Drives: 2017 2ss, m6 Join Date: Jan 2017 Location: Iowa Posts: 231	Well you really don't have the capability with the GM cylinder head casting to get the airflow needed to spin the engine all that high. Sure, you can cam it to the moon and get it there but you won't see it building good power. If you can't get a head into the 360 c.f. range you won't like the power curve of a NA unit above 7250. Jmho

02-02-2018, 02:01 PM	#9
PRAY Drives: 2016 2SS Join Date: Jul 2016 Location: Sanford NC Posts: 2,766	This is a pretty small cam with ported Stock top end. It flattens out up top but doesn't fall off. __________________ 2016 2SS. H/C SBE 1.37 60ft, 6.36@109.49, 9.97@136+. Nuff Said.

02-02-2018, 05:51 PM	#10
DFW1LE Drives: 2017 SS 1LE Mosiac Black Join Date: Nov 2016 Location: DFW, TX Posts: 1,132	The max power on my little cam is 536 @ 6115. It does drop off around 6400. __________________ ________________________________________________ Frankenstein Engineering Dynamics Stage 1 H/C/E85 536HP/488TQ

02-03-2018, 08:00 AM	#13
BradfordCamaro SABIO Drives: 2016 CAMARO 1SS Join Date: Jul 2015 Location: Bradford, ON Posts: 5,012	Wish I could say mine did. I peak at 6K and it hangs there to about 6,700. I could probably use a better Cam. Missing out on 50hp __________________

02-03-2018, 01:35 PM	#14
PRAY Drives: 2016 2SS Join Date: Jul 2016 Location: Sanford NC Posts: 2,766	I am going to give it one more shot with a different cam in my car. __________________ 2016 2SS. H/C SBE 1.37 60ft, 6.36@109.49, 9.97@136+. Nuff Said.

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