ls7 cam help
ls7 cam help I am having problems with low dyno #'s with my ls7 headed 427.
Motor
ls2 427
ls7 heads and intake with some work on the exhaust.
Cam 236/246 639 lift
LT headers
Right now the car is making 510RWHP 485RWTQ
Car was tuned by Newtech.
I also had the car on K&N dyno this week and the hp was without 1hp of Newtech's dyno.
I tried open headers to make sure that the exhaust is not holding the motor back.
I wanted to use lg MotorSports cam so I called them. They told me that they will not sale a cam with out a head and cam package $3800 no thanks. Has anyone had this problem with LG?
So right now I am looking for a proven cam that has made 560-590rwhp on the ls7 engine.
So does anyone have any ideas.
[IMG]
[/IMG]
Motor
ls2 427
ls7 heads and intake with some work on the exhaust.
Cam 236/246 639 lift
LT headers
Right now the car is making 510RWHP 485RWTQ
Car was tuned by Newtech.
I also had the car on K&N dyno this week and the hp was without 1hp of Newtech's dyno.
I tried open headers to make sure that the exhaust is not holding the motor back.
I wanted to use lg MotorSports cam so I called them. They told me that they will not sale a cam with out a head and cam package $3800 no thanks. Has anyone had this problem with LG?
So right now I am looking for a proven cam that has made 560-590rwhp on the ls7 engine.
So does anyone have any ideas.
[IMG]
[/IMG] 
TECH Regular
Joined: Nov 2005
Posts: 459
Likes: 0
From: Arlington, TN
I'ld say talk to Kaytech about the cam they use in the Street attack package
https://ls1tech.com/forums/generation-iv-internal-engine/488290-introducing-katech-s-new-crate-engine-packages.html
That cam should get you to close the rwhp you're looking for... just a thought.
https://ls1tech.com/forums/generation-iv-internal-engine/488290-introducing-katech-s-new-crate-engine-packages.html
KAT-A4730 Crate Engine - Street Attack LS7 7.0L
Top-tier LS7 performance engineered for street applications. Crate engine features Katech 11:1 compression forged pistons, solid small-end rod bushings, street-optimized camshaft, and valvetrain enhancements. F-Car and Y-Car applications available. The perfect choice for high power, daily driven vehicles.
Starting at $8,400 + LS7
630+hp
Top-tier LS7 performance engineered for street applications. Crate engine features Katech 11:1 compression forged pistons, solid small-end rod bushings, street-optimized camshaft, and valvetrain enhancements. F-Car and Y-Car applications available. The perfect choice for high power, daily driven vehicles.
Starting at $8,400 + LS7
630+hp
I can tell you right now that you need more split in the dur between your intake/exhaust.
Depending on your CR that you're running your 236 dur on the intake will be alright, I might run it up to 238-239 though. But you're going to need a healthy 250+ on the exhaust.
Also, if you could post up your graph, depending on what springs you're using, you may be experiencing valve float ect...
Lastly, what is your complete combo from trans to rear?
Thanks,
Adrian
Depending on your CR that you're running your 236 dur on the intake will be alright, I might run it up to 238-239 though. But you're going to need a healthy 250+ on the exhaust.
Also, if you could post up your graph, depending on what springs you're using, you may be experiencing valve float ect...
Lastly, what is your complete combo from trans to rear?
Thanks,
Adrian
I am using Patriot gold valve springs. I will try and post the graph later today. I am running 11.25:1 CR. I did a compression test and came up with 190psi on the drivers side and 195psi on the pass side.
T56 trans 3.90 rx7 diff
T56 trans 3.90 rx7 diff
Originally Posted by Mas280
I am having problems with low dyno #'s with my ls7 headed 427.
Motor
ls2 427
ls7 heads and intake with some work on the exhaust.
Cam 236/246 639 lift
LT headers
Right now the car is making 510RWHP 485RWTQ
Car was tuned by Newtech.
I also had the car on K&N dyno this week and the hp was without 1hp of Newtech's dyno.
I tried open headers to make sure that the exhaust is not holding the motor back.
I wanted to use lg MotorSports cam so I called them. They told me that they will not sale a cam with out a head and cam package $3800 no thanks. Has anyone had this problem with LG?
So right now I am looking for a proven cam that has made 560-590rwhp on the ls7 engine.
So does anyone have any ideas.
[IMG][/IMG]
Motor
ls2 427
ls7 heads and intake with some work on the exhaust.
Cam 236/246 639 lift
LT headers
Right now the car is making 510RWHP 485RWTQ
Car was tuned by Newtech.
I also had the car on K&N dyno this week and the hp was without 1hp of Newtech's dyno.
I tried open headers to make sure that the exhaust is not holding the motor back.
I wanted to use lg MotorSports cam so I called them. They told me that they will not sale a cam with out a head and cam package $3800 no thanks. Has anyone had this problem with LG?
So right now I am looking for a proven cam that has made 560-590rwhp on the ls7 engine.
So does anyone have any ideas.
[IMG]
[/IMG]It looks like by your photo that is a dynojet which I would expect to see more power. We just made 508rwhp on a Mustang using our LS7 cam. You're not going to make 590rwhp without something very radical. I'm sure a lot of people on the internet are going to tell you that you can, but there are a lot of bench racers. (nobody here of course). I've seen the numbers, I know the uninflated/unbiased truth and I know what is realistic.
A funny sidenote that just proves how these rediculous power numbers get out there. Any car I drive out on the streets of Metro Detroit gains about 100-200hp in a week. Rumors spread and numbers get inflated and before you know it, somebody is asking me "Hey isn't this the one that made 750hp to the wheels?" Um...no.
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Originally Posted by Mas280
I am using Patriot gold valve springs. I will try and post the graph later today. I am running 11.25:1 CR. I did a compression test and came up with 190psi on the drivers side and 195psi on the pass side.
T56 trans 3.90 rx7 diff
T56 trans 3.90 rx7 diff
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Originally Posted by Katech
I'm interested to see the dyno graph. Are those dual springs? Have they been tested with an LS7 on an Optron valvetrain dynamics test cell? I'm wondering if the valvetrain is in control.
The valve springs are dual, I will have to check with the engine builder about the dynamics test cell. The Motor was built by David White (redline Motorsports).
Mike- Can you have the tuner overlay the graphs from your 402 with ported 5.3 heads and FAST 90/90 and this LS7 headed LS2 stroker? It would be interesing to see how they differ from 6-7K RPM and down low.
We sell our Cam package for that price because we do a lot of other work regarding valves, valve jobs, and other safety items that rid the stock setup of the failure prone lash pads.
What is your exhaust setup like? A cam that size should make 50 more to the wheels. We regularly make 560-580 with a cam much smaller than that.
Regards,
Louis
What is your exhaust setup like? A cam that size should make 50 more to the wheels. We regularly make 560-580 with a cam much smaller than that.
Regards,
Louis
Originally Posted by Louis
We sell our Cam package for that price because we do a lot of other work regarding valves, valve jobs, and other safety items that rid the stock setup of the failure prone lash pads.
What is your exhaust setup like? A cam that size should make 50 more to the wheels. We regularly make 560-580 with a cam much smaller than that.
Regards,
Louis
What is your exhaust setup like? A cam that size should make 50 more to the wheels. We regularly make 560-580 with a cam much smaller than that.
Regards,
Louis
Louis,
What failures have you seen with the lash caps?
Originally Posted by Louis
We sell our Cam package for that price because we do a lot of other work regarding valves, valve jobs, and other safety items that rid the stock setup of the failure prone lash pads.
What is your exhaust setup like? A cam that size should make 50 more to the wheels. We regularly make 560-580 with a cam much smaller than that.
Regards,
Louis
What is your exhaust setup like? A cam that size should make 50 more to the wheels. We regularly make 560-580 with a cam much smaller than that.
Regards,
Louis
I am running LT 17/8 headers headers with Burns merge collectors.
I think that the motor should be making more power with this cam also. I am going to install a new cam and see what that will do. Do you want to sale me a cam? I want to use a cam that has allready made good power.
Mike
Traver 
The biggie would be a few things here.
1. Valve springs, get something else in there that WORKS
2. +10 more exhaust duration
3. Fix the exhaust port in the heads, working on that will show you some gains as well.
Put those 3 things together and that might start to get you some of your power.
Bret
1. Valve springs, get something else in there that WORKS
2. +10 more exhaust duration
3. Fix the exhaust port in the heads, working on that will show you some gains as well.
Put those 3 things together and that might start to get you some of your power.
Bret