Discussion
SSPPGG said:
beer money gratefully accepted. i'm making a kit for Peter to try, happy to get another together if you'd like, but perhaps better to try mine when its done first
Many thanks and would really appreciate the opportunity to try the system out first as every other set up i've tried has been to light for the track!Are you running GM ECU and FBW throttle? Whats do you think of the FBW?
I know i will sacrifice some drivability and fuel consumption but am thinking about going with an Omex or Motec ECU and cable throttle to give me that raw muscle car feel with lots of pops and bangs on the overrun and a more direct throttle response.
7 TVR said:
Many thanks and would really appreciate the opportunity to try the system out first as every other set up i've tried has been to light for the track!
Are you running GM ECU and FBW throttle? Whats do you think of the FBW?
I know i will sacrifice some drivability and fuel consumption but am thinking about going with an Omex or Motec ECU and cable throttle to give me that raw muscle car feel with lots of pops and bangs on the overrun and a more direct throttle response.
makes sense. i tried a few pumps before settling on this setup, as most of them made the steering too light...Are you running GM ECU and FBW throttle? Whats do you think of the FBW?
I know i will sacrifice some drivability and fuel consumption but am thinking about going with an Omex or Motec ECU and cable throttle to give me that raw muscle car feel with lots of pops and bangs on the overrun and a more direct throttle response.
ive had both FBW and FBC LS engines. there are tables to amend the throttle feel and rate in the GM FBW system, set properly, you cant really tell the difference, though the FBW was smoother using big cams, especially at lower revs
Of course if you run mafless, and without o2 sensors, even in the GM system, you can command the fuel table to "bang and pop" with the best of them.
i could get 2ft flames out of the sidepipes of my GM ecu'd cobra, just by trailing the throttle very slightly on overun...fantastic fun burning the paint off the doors of the chav brigade
Edited by SSPPGG on Tuesday 18th September 14:03
SSPPGG said:
makes sense. i tried a few pumps before settling on this setup, as most of them made the steering too light...
ive had both FBW and FBC LS engines. there are tables to amend the throttle feel and rate in the GM FBW system, set properly, you cant really tell the difference, though the FBW was smoother using big cams, especially at lower revs
Of course if you run mafless, and without o2 sensors, even in the GM system, you can command the fuel table to "bang and pop" with the best of them.
i could get 2ft flames out of the sidepipes of my GM ecu'd cobra, just by trailing the throttle very slightly on overun...fantastic fun burning the paint off the doors of the chav brigade
Ok so you now have me hooked i will PM you to discuss further as up till know i have been told these results good not be achieved on the GM ECU!ive had both FBW and FBC LS engines. there are tables to amend the throttle feel and rate in the GM FBW system, set properly, you cant really tell the difference, though the FBW was smoother using big cams, especially at lower revs
Of course if you run mafless, and without o2 sensors, even in the GM system, you can command the fuel table to "bang and pop" with the best of them.
i could get 2ft flames out of the sidepipes of my GM ecu'd cobra, just by trailing the throttle very slightly on overun...fantastic fun burning the paint off the doors of the chav brigade
Edited by SSPPGG on Tuesday 18th September 14:03
Big flames and the right noise on the over-un would complete my car[well apart from the to power steer or not issue]
I want the Griff to be as much an aural & visual experience as it is silly fast
Mafless?? For the ignorant
7 TVR said:
Ok so you now have me hooked i will PM you to discuss further as up till know i have been told these results good not be achieved on the GM ECU!
Big flames and the right noise on the over-un would complete my car[well apart from the to power steer or not issue]
I want the Griff to be as much an aural & visual experience as it is silly fast
Mafless?? For the ignorant
MAFLESSBig flames and the right noise on the over-un would complete my car[well apart from the to power steer or not issue]
I want the Griff to be as much an aural & visual experience as it is silly fast
Mafless?? For the ignorant
one of the engines i had was built by a chap called schw
ke in the us.he builds lots of LS for circuit racing, oval racing etc.
he uses a GM ecu
he supplied me with a map suitable for the engine, and cam i chose, which ran mafless (ie it was tuned speed density), ran no oxygen sensors, so the engine just got the fuel commanded by the preset fuel and timing tables. the ecu had no method of "self monitoring"
what that seemed to translate to was very snappy performance, overfuelling at lower revs, which caused immense popping and banging on over runs etc, just the same as the cerbera overfuelling causing that characteristic popping and banging
the ecu was pretty much set to run full throttle at tracks, and ran really strong (550 hp on a mild cam) and whilst the bottom end wasn't miles out, it tended to run rich everywhere, just because that was the way the ecu was set to fuel, and without any sensors, it didnt know or have the ability to monitor and amend the fuelling
whilst on a regular road car, you might not want this, on a 7 litre cobra, spitting flames and a temprement where the engine, on occasion, just seemed to want to kill me, just added to the character of the whole driving experience. the GM ecu is incredibly mappable, ive seen plenty of them mapped to 700, 800 or more HP, with single, twin turbos, superchargers...
i would spend some more time on a mapping session with someone who really knows modified LS engines, and be clear what you want, before ripping out a very competent engine management system, call if you want to chat, and i can point you to chaps who tune lots of high power modified LS engines (and who did my last rather tame by comparison 430hp ls1)
steve
Edited by SSPPGG on Wednesday 19th September 00:03
SSPPGG said:
MAFLESS
one of the engines i had was built by a chap called schwke in the us.
he builds lots of LS for circuit racing, oval racing etc.
he uses a GM ecu
he supplied me with a map suitable for the engine, and cam i chose, which ran mafless (ie it was tuned speed density), ran no oxygen sensors, so the engine just got the fuel commanded by the preset fuel and timing tables. the ecu had no method of "self monitoring"
what that seemed to translate to was very snappy performance, overfuelling at lower revs, which caused immense popping and banging on over runs etc, just the same as the cerbera overfuelling causing that characteristic popping and banging
the ecu was pretty much set to run full throttle at tracks, and ran really strong (550 hp on a mild cam) and whilst the bottom end wasn't miles out, it tended to run rich everywhere, just because that was the way the ecu was set to fuel, and without any sensors, it didnt know or have the ability to monitor and amend the fuelling
whilst on a regular road car, you might not want this, on a 7 litre cobra, spitting flames and a temprement where the engine, on occasion, just seemed to want to kill me, just added to the character of the whole driving experience. the GM ecu is incredibly mappable, ive seen plenty of them mapped to 700, 800 or more HP, with single, twin turbos, superchargers...
i would spend some more time on a mapping session with someone who really knows modified LS engines, and be clear what you want, before ripping out a very competent engine management system, call if you want to chat, and i can point you to chaps who tune lots of high power modified LS engines (and who did my last rather tame by comparison 430hp ls1)
steve
Thanks Steve, i have only used one guy so far for mapping so will PM you!
one of the engines i had was built by a chap called schw
ke in the us.he builds lots of LS for circuit racing, oval racing etc.
he uses a GM ecu
he supplied me with a map suitable for the engine, and cam i chose, which ran mafless (ie it was tuned speed density), ran no oxygen sensors, so the engine just got the fuel commanded by the preset fuel and timing tables. the ecu had no method of "self monitoring"
what that seemed to translate to was very snappy performance, overfuelling at lower revs, which caused immense popping and banging on over runs etc, just the same as the cerbera overfuelling causing that characteristic popping and banging
the ecu was pretty much set to run full throttle at tracks, and ran really strong (550 hp on a mild cam) and whilst the bottom end wasn't miles out, it tended to run rich everywhere, just because that was the way the ecu was set to fuel, and without any sensors, it didnt know or have the ability to monitor and amend the fuelling
whilst on a regular road car, you might not want this, on a 7 litre cobra, spitting flames and a temprement where the engine, on occasion, just seemed to want to kill me, just added to the character of the whole driving experience. the GM ecu is incredibly mappable, ive seen plenty of them mapped to 700, 800 or more HP, with single, twin turbos, superchargers...
i would spend some more time on a mapping session with someone who really knows modified LS engines, and be clear what you want, before ripping out a very competent engine management system, call if you want to chat, and i can point you to chaps who tune lots of high power modified LS engines (and who did my last rather tame by comparison 430hp ls1)
steve
Thanks Steve, i have only used one guy so far for mapping so will PM you!
Edited by SSPPGG on Wednesday 19th September 00:03
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