How to increase the stock rev limiter?
How to increase the stock rev limiter?
Hey guys, I have a 97 SC300- I'll be swapping it to a 5spd this weekend. Within a month, I will install a T67 turbo, along with a thicker head gasket (OEM supra TT, lowering compression to 9.0:1), and tune with a MAP ECU. The stock rev limiter is pretty low (6,250 or 6,500.. not exactly sure). Some extra room to rev in each gear would be kinda nice to have...
Is there any way to raise the limiter? I have a manual tranny ECU by the way- not sure if it makes a difference though. Is there a way we could possibly rev to 7,000? Maybe even 7,500? I tried searching, but nothing came up. Any thoughts or suggestions would be great, thanks in advance.
-Allen
Is there any way to raise the limiter? I have a manual tranny ECU by the way- not sure if it makes a difference though. Is there a way we could possibly rev to 7,000? Maybe even 7,500? I tried searching, but nothing came up. Any thoughts or suggestions would be great, thanks in advance.
-Allen
Pole Position
Joined: Apr 2006
Posts: 245
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From: Texas
the emange ultimate claims that it can alter rev limit (there might be other piggybacks, but i'm not sure) although i don't now if anyone has done on an sc300 and see if that function actually works, otherwise it will take a stand alone.
Has anyone in here "overclocked" the ECU? I had someone overclock the ECU on my 3000GT VR4 by 10%- raisining the limiter to 8,000 rpm. All that needed to be swapped was a single little crystal on the ECU's board.
-Allen
-Allen
Pole Position
Joined: Dec 2005
Posts: 270
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From: Chicago 'burbs
Driver
Joined: Jan 2007
Posts: 153
Likes: 0
From: WA
The Rev limiter is set for reason. Changing it without changing the fuel map and other misc parts harms the car and makes it starv for fuel cause it is going past the fuel cutoff! My suggestion is look for a ECU reflash they usually add higher revs and change the fuel map and other misc parts. Other then that if you want to change it you need to get it dynoed so they can reflash the ecu and the fuel map so it compinsates for the add revs!
Hope this helps good luck! Also post detailed pics of the swap with instructions. As I mentiond to you that I wanted to do the swap this summer and it would be nice to get some references.
Hope this helps good luck! Also post detailed pics of the swap with instructions. As I mentiond to you that I wanted to do the swap this summer and it would be nice to get some references.
*****Do not buy from this member until further notice *****
Joined: Jun 2006
Posts: 711
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From: 2 CAR LENGTH AHEAD OF YOU!!!
you wont need the extra rev you'll have a turbo i dont thin you will get very much lag the tt head gasket wont lower your compression to 9:1 boost first then worry about if you need more. baby steps dont blow your motor
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I believe the rev limit on a manual sc300 is 6800rpm- so I think that should be fine. I thought it was the same as the auto rev limiter. Could anyone verify this?
-Allen
if you want to rev high get a 1j and call it a day
Lexus Test Driver
Joined: Aug 2003
Posts: 887
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From: California
Now running a Supra TT obd1 ecu, though the SC300 ecu was same rpm cutoff.
Last edited by SCoupe; Mar 9, 2007 at 05:16 AM.