aussy-boyz Posted March 1, 2012 Share Posted March 1, 2012 Hey guys we have a rb25 running a rb20 loom with rb20 ecu. Car fires at start then just wont rev and dies. but when we plug rb25 computer it runs fine. then pluged rb20 computer into r33 and runs fine. so both computers are ok, Reason for wanting to use rb20 computer is for remap purposes. Also has 550cc injectors. Any ideas to try would be great, cheers Link to comment https://www.sau.com.au/forums/topic/393449-rb25-with-rb20-loom-and-rb20-ecu-wont-run/ Share on other sites More sharing options...
Bsa Posted March 1, 2012 Share Posted March 1, 2012 Did you change the tps to rb20 Link to comment https://www.sau.com.au/forums/topic/393449-rb25-with-rb20-loom-and-rb20-ecu-wont-run/#findComment-6257873 Share on other sites More sharing options...
BOOZTJUNKEY Posted March 1, 2012 Share Posted March 1, 2012 Yeah 25s have a different tps from memory . Link to comment https://www.sau.com.au/forums/topic/393449-rb25-with-rb20-loom-and-rb20-ecu-wont-run/#findComment-6257878 Share on other sites More sharing options...
aussy-boyz Posted March 1, 2012 Author Share Posted March 1, 2012 Yeah have tried both man Link to comment https://www.sau.com.au/forums/topic/393449-rb25-with-rb20-loom-and-rb20-ecu-wont-run/#findComment-6257927 Share on other sites More sharing options...
aussy-boyz Posted March 1, 2012 Author Share Posted March 1, 2012 is running a rb20 afm,25 knock sensors as well Link to comment https://www.sau.com.au/forums/topic/393449-rb25-with-rb20-loom-and-rb20-ecu-wont-run/#findComment-6257952 Share on other sites More sharing options...
Bsa Posted March 1, 2012 Share Posted March 1, 2012 20 and 25 knock sensors are the same from memory you getting spark or fuel? Is the ecu ok Link to comment https://www.sau.com.au/forums/topic/393449-rb25-with-rb20-loom-and-rb20-ecu-wont-run/#findComment-6257972 Share on other sites More sharing options...
Bsa Posted March 1, 2012 Share Posted March 1, 2012 The injectors in guessing rb20 only suppors 270 tge 550 will flood tge motor and die Link to comment https://www.sau.com.au/forums/topic/393449-rb25-with-rb20-loom-and-rb20-ecu-wont-run/#findComment-6257993 Share on other sites More sharing options...
BOOZTJUNKEY Posted March 1, 2012 Share Posted March 1, 2012 So it's a factory ecu with 550cc inj? It won't start with them go bact to stock or tow to get tuned Link to comment https://www.sau.com.au/forums/topic/393449-rb25-with-rb20-loom-and-rb20-ecu-wont-run/#findComment-6257998 Share on other sites More sharing options...
aussy-boyz Posted March 1, 2012 Author Share Posted March 1, 2012 that was my thoughts but runs with 25 computer????/ Link to comment https://www.sau.com.au/forums/topic/393449-rb25-with-rb20-loom-and-rb20-ecu-wont-run/#findComment-6258150 Share on other sites More sharing options...
Bsa Posted March 1, 2012 Share Posted March 1, 2012 Yeah they are 370 STD so will allow more fuel controll you need it tuned for the rb20 injectors to work Link to comment https://www.sau.com.au/forums/topic/393449-rb25-with-rb20-loom-and-rb20-ecu-wont-run/#findComment-6258221 Share on other sites More sharing options...
DVS JEZ Posted March 1, 2012 Share Posted March 1, 2012 Is it a series 1 rb25??? Need's a nistune And some new spark plugs Link to comment https://www.sau.com.au/forums/topic/393449-rb25-with-rb20-loom-and-rb20-ecu-wont-run/#findComment-6258400 Share on other sites More sharing options...
aussy-boyz Posted March 1, 2012 Author Share Posted March 1, 2012 Yeah series 1. Also has 25 injectors not 20. Link to comment https://www.sau.com.au/forums/topic/393449-rb25-with-rb20-loom-and-rb20-ecu-wont-run/#findComment-6258509 Share on other sites More sharing options...
Bsa Posted March 1, 2012 Share Posted March 1, 2012 I'm just saying you can't just throw in injectors and drive it needs to be tuned to suite Link to comment https://www.sau.com.au/forums/topic/393449-rb25-with-rb20-loom-and-rb20-ecu-wont-run/#findComment-6258524 Share on other sites More sharing options...
aussy-boyz Posted March 2, 2012 Author Share Posted March 2, 2012 Yeah i no but it should run just super rich? Link to comment https://www.sau.com.au/forums/topic/393449-rb25-with-rb20-loom-and-rb20-ecu-wont-run/#findComment-6258856 Share on other sites More sharing options...
BOOZTJUNKEY Posted March 2, 2012 Share Posted March 2, 2012 No not necessarily if they are two big they could flood the chamber and not run at all go back to stock or tune it! Link to comment https://www.sau.com.au/forums/topic/393449-rb25-with-rb20-loom-and-rb20-ecu-wont-run/#findComment-6258869 Share on other sites More sharing options...
Moodles2 Posted March 2, 2012 Share Posted March 2, 2012 Injector sizes are different that's the obvious part, but the injector latency will be completely different. The aftermarket injector having a completely different lag time vs the factory injector, those 550cc's might be injecting too early or too late than the factory ECU is expecting which will most likely explain why it can't idle. Link to comment https://www.sau.com.au/forums/topic/393449-rb25-with-rb20-loom-and-rb20-ecu-wont-run/#findComment-6259012 Share on other sites More sharing options...
Birds Posted March 2, 2012 Share Posted March 2, 2012 Wouldn't even contemplate a slight upgrade in injector size without a tuning the ECU. Link to comment https://www.sau.com.au/forums/topic/393449-rb25-with-rb20-loom-and-rb20-ecu-wont-run/#findComment-6259064 Share on other sites More sharing options...
aussy-boyz Posted March 2, 2012 Author Share Posted March 2, 2012 I know it needs a tune im not retarded. I just wanted.it actually running when i took it Link to comment https://www.sau.com.au/forums/topic/393449-rb25-with-rb20-loom-and-rb20-ecu-wont-run/#findComment-6259076 Share on other sites More sharing options...
Bsa Posted March 2, 2012 Share Posted March 2, 2012 Get a tune and it will run Link to comment https://www.sau.com.au/forums/topic/393449-rb25-with-rb20-loom-and-rb20-ecu-wont-run/#findComment-6259145 Share on other sites More sharing options...
DVS JEZ Posted March 2, 2012 Share Posted March 2, 2012 Get a NIStune and it will run fixed Link to comment https://www.sau.com.au/forums/topic/393449-rb25-with-rb20-loom-and-rb20-ecu-wont-run/#findComment-6259230 Share on other sites More sharing options...
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