Haltech Rev Limiter on PS1000
Thread Starter
Rotary Enthusiast
Joined: Oct 2007
Posts: 799
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From: Plymouth, MN
Rev Limiter on PS1000
I have always frowned at fuel cut rev limiters when running high boost. I just don't like the idea of cutting and starting fuel while under full boost. Of course, I come from the school of microtech so that might have something to do with it.
I am looking for feedback for setting up the Rev Limiter in the Platinum Sport 1000 ECU. I noticed you can do ignition or fuel and that you can choose between soft or hard. I was thinking of doing ignition and hard cut.
If soft cut is better, how would I setup the rpm range for it so that I have, say, a full 8400rpm of useful powerband?
Any experiences or feedback is appreciated.
Thanks!
Chris
I am looking for feedback for setting up the Rev Limiter in the Platinum Sport 1000 ECU. I noticed you can do ignition or fuel and that you can choose between soft or hard. I was thinking of doing ignition and hard cut.
If soft cut is better, how would I setup the rpm range for it so that I have, say, a full 8400rpm of useful powerband?
Any experiences or feedback is appreciated.
Thanks!
Chris
Thread Starter
Rotary Enthusiast
Joined: Oct 2007
Posts: 799
Likes: 3
From: Plymouth, MN
I have always frowned at fuel cut rev limiters when running high boost. I just don't like the idea of cutting and starting fuel while under full boost. Of course, I come from the school of microtech so that might have something to do with it.
I am looking for feedback for setting up the Rev Limiter in the Platinum Sport 1000 ECU. I noticed you can do ignition or fuel and that you can choose between soft or hard. I was thinking of doing ignition and hard cut.
If soft cut is better, how would I setup the rpm range for it so that I have, say, a full 8400rpm of useful powerband?
Any experiences or feedback is appreciated.
Thanks!
Chris
I am looking for feedback for setting up the Rev Limiter in the Platinum Sport 1000 ECU. I noticed you can do ignition or fuel and that you can choose between soft or hard. I was thinking of doing ignition and hard cut.
If soft cut is better, how would I setup the rpm range for it so that I have, say, a full 8400rpm of useful powerband?
Any experiences or feedback is appreciated.
Thanks!
Chris
No one has experience with the Haltech Rev Limiter function?
Dang, Mr Patience. 
Soft cut is just that. You can program a long soft cut range (say 1000 rpm) and the engine will not bang hard on the limiter. It will just feel like it's a little down on power and stops pulling versus throwing you into the dash when it shuts off all together as it would with a hard cut.
The limiter rpm will be the hard cut number. So, if you set the limiter at 8000, with a cut range of 500, the ECU will start cutting spark or fuel at 7500 and will then hard cut at 8000, if you get to that point.
On a stock or street port engine, power will fall off long before you are to the point where you'll hurt the engine. I'll usually set those at at 8500 and just do a hard cut with the intent of never actually having to use the limiter. Only way you get there is if you've really cocked up a shift. If you are good enough to pull the 2-1 or 4-3 upshift (been there!), the limiter isn't stopping anything anyway.
For the two-step, you'll use a soft cut and use the range to dial in the actual rpm the engine is held at. You don't want to hit the hard cut on the two-step. If it does the revs will bang up and down and not be real consistent. With the soft cut, you can dial in a given rpm and hold the engine is a tight range so that launches are more consistent. Fuel cut may be advantageous here to keep the engine from loading up. Since the engine isn't loaded, damage is very unlikely. If you're doing anti-lag to build boost on the line, you really can't cut fuel though.
Soft cut is just that. You can program a long soft cut range (say 1000 rpm) and the engine will not bang hard on the limiter. It will just feel like it's a little down on power and stops pulling versus throwing you into the dash when it shuts off all together as it would with a hard cut.
The limiter rpm will be the hard cut number. So, if you set the limiter at 8000, with a cut range of 500, the ECU will start cutting spark or fuel at 7500 and will then hard cut at 8000, if you get to that point.
On a stock or street port engine, power will fall off long before you are to the point where you'll hurt the engine. I'll usually set those at at 8500 and just do a hard cut with the intent of never actually having to use the limiter. Only way you get there is if you've really cocked up a shift. If you are good enough to pull the 2-1 or 4-3 upshift (been there!), the limiter isn't stopping anything anyway.
For the two-step, you'll use a soft cut and use the range to dial in the actual rpm the engine is held at. You don't want to hit the hard cut on the two-step. If it does the revs will bang up and down and not be real consistent. With the soft cut, you can dial in a given rpm and hold the engine is a tight range so that launches are more consistent. Fuel cut may be advantageous here to keep the engine from loading up. Since the engine isn't loaded, damage is very unlikely. If you're doing anti-lag to build boost on the line, you really can't cut fuel though.
Thread Starter
Rotary Enthusiast
Joined: Oct 2007
Posts: 799
Likes: 3
From: Plymouth, MN
Dang, Mr Patience.
Soft cut is just that. You can program a long soft cut range (say 1000 rpm) and the engine will not bang hard on the limiter. It will just feel like it's a little down on power and stops pulling versus throwing you into the dash when it shuts off all together as it would with a hard cut.
The limiter rpm will be the hard cut number. So, if you set the limiter at 8000, with a cut range of 500, the ECU will start cutting spark or fuel at 7500 and will then hard cut at 8000, if you get to that point.
On a stock or street port engine, power will fall off long before you are to the point where you'll hurt the engine. I'll usually set those at at 8500 and just do a hard cut with the intent of never actually having to use the limiter. Only way you get there is if you've really cocked up a shift. If you are good enough to pull the 2-1 or 4-3 upshift (been there!), the limiter isn't stopping anything anyway.
For the two-step, you'll use a soft cut and use the range to dial in the actual rpm the engine is held at. You don't want to hit the hard cut on the two-step. If it does the revs will bang up and down and not be real consistent. With the soft cut, you can dial in a given rpm and hold the engine is a tight range so that launches are more consistent. Fuel cut may be advantageous here to keep the engine from loading up. Since the engine isn't loaded, damage is very unlikely. If you're doing anti-lag to build boost on the line, you really can't cut fuel though.
Soft cut is just that. You can program a long soft cut range (say 1000 rpm) and the engine will not bang hard on the limiter. It will just feel like it's a little down on power and stops pulling versus throwing you into the dash when it shuts off all together as it would with a hard cut.
The limiter rpm will be the hard cut number. So, if you set the limiter at 8000, with a cut range of 500, the ECU will start cutting spark or fuel at 7500 and will then hard cut at 8000, if you get to that point.
On a stock or street port engine, power will fall off long before you are to the point where you'll hurt the engine. I'll usually set those at at 8500 and just do a hard cut with the intent of never actually having to use the limiter. Only way you get there is if you've really cocked up a shift. If you are good enough to pull the 2-1 or 4-3 upshift (been there!), the limiter isn't stopping anything anyway.
For the two-step, you'll use a soft cut and use the range to dial in the actual rpm the engine is held at. You don't want to hit the hard cut on the two-step. If it does the revs will bang up and down and not be real consistent. With the soft cut, you can dial in a given rpm and hold the engine is a tight range so that launches are more consistent. Fuel cut may be advantageous here to keep the engine from loading up. Since the engine isn't loaded, damage is very unlikely. If you're doing anti-lag to build boost on the line, you really can't cut fuel though.
I'm guessing that I will change things to have a soft cut at 9200 with a cut range of 700 so it will start softening at 8500. I want to shift at 8-8400 range so this will help and it should never hit the hard cut unless I really screw something up...(never happens...yeah right)
Thanks for the response!
C
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