How to decrease the power in a LS1
On The Tree
Joined: Sep 2009
Posts: 197
Likes: 0
From: Huntsville, AL
You could build it up for torque instead of power and only rev it to 4k as others have said. That motor should last a million years only turning 4k.
This!
I've heard that a "valet key" option is available with LS1Edit but not with HPtuners.
I also want a "low horsepower" option since I don't want to give my wife or the casino valets here in Vegas a 500HP car. I need to do some more research to verify but I'm been told that a switch (key activated or toggle switch) can change the tune to a 200HP or so variant.
I've heard that a "valet key" option is available with LS1Edit but not with HPtuners.
I also want a "low horsepower" option since I don't want to give my wife or the casino valets here in Vegas a 500HP car. I need to do some more research to verify but I'm been told that a switch (key activated or toggle switch) can change the tune to a 200HP or so variant.
Here's what you do...
Restrict the intake.. build a simple plate behind the throttle body with only a 40mm or so hole. Like a throttle body spacer, but tapered down.. You can easily remove it once it's inspected. It won't run poorly, it'll just lack power. (the MAF will still read airflow and compensate for it with the fuel..
Have a sponsor create a tune for you.. Pin the connector in the PCM for valet mode, install a toggle switch somewhere, and have one tune that lacks a serious amount of spark timing. I wouldn't tell your inspector person about this, just say it's detuned. They won't make any connection between a random toggle switch and the output of the engine. The second tune can have a rev limiter as well, make it redline at 4000 rpm and with that intake restriction, you may be within your power range.. if not, you can always use a 5.3 cam (designed for torque), and swap it back later.
Restrict the intake.. build a simple plate behind the throttle body with only a 40mm or so hole. Like a throttle body spacer, but tapered down.. You can easily remove it once it's inspected. It won't run poorly, it'll just lack power. (the MAF will still read airflow and compensate for it with the fuel..
Have a sponsor create a tune for you.. Pin the connector in the PCM for valet mode, install a toggle switch somewhere, and have one tune that lacks a serious amount of spark timing. I wouldn't tell your inspector person about this, just say it's detuned. They won't make any connection between a random toggle switch and the output of the engine. The second tune can have a rev limiter as well, make it redline at 4000 rpm and with that intake restriction, you may be within your power range.. if not, you can always use a 5.3 cam (designed for torque), and swap it back later.
Thread Starter
Teching In
Joined: Mar 2011
Posts: 10
Likes: 0
From: Norway
For the first, I never gona swap the Jeep.
Thanks for good and better solutions here, 67RSCamaroVette probably got some of the best solutions. Nice to have someone to get tips from, thats means all of you.
Becouse of the silly customs/tax rules over her, the LS1 engine isnt verry common at all, rare is the right word. beautiful engine dow.
Close to night here now, good night for now
AR
Thanks for good and better solutions here, 67RSCamaroVette probably got some of the best solutions. Nice to have someone to get tips from, thats means all of you.
Becouse of the silly customs/tax rules over her, the LS1 engine isnt verry common at all, rare is the right word. beautiful engine dow.
Close to night here now, good night for now
AR
The restrictor palte isn't a bad idea, what about putting an electric cutout before the throttle body? Close it like 50% when you have to do the test, then you can open it back up with a toggle switch. Never have to even shut the car off.
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Seem that a Restrictor plate and lowering the PCM's Rev Limiter would be the only safe way to do this...maybe tweeking the Fuel tables a bit (would not go to far, lean condition is not good).
Another items is the Spark advance, maybe taking out some and running a lower grade of fuel.
Another items is the Spark advance, maybe taking out some and running a lower grade of fuel.
As suggested, the best way to limit HP is with a rev limiter. I think a dual mode flash sounds like the most elegant solution. Remember, HP = (Torque x RPM)/5252
Andrew
Andrew
Thread Starter
Teching In
Joined: Mar 2011
Posts: 10
Likes: 0
From: Norway
well, it isnt that easy. The authorities only look at the hp in the Certificates of Title or what the main Jeep Importer tells about max hp.
Thread Starter
Teching In
Joined: Mar 2011
Posts: 10
Likes: 0
From: Norway
Here I come 