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#1 |
Join Date: Sep 2020
Location: Spain
Posts: 3
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Advice for a tunned gy6 152qmi efi engine
Good afternoon,
I have a chinese scooter using a 152qmi engine with injection (euro4 model). The generic brand/model of the scooter is "Jiajue JJ125T-23" but the spanish imported brand is called "SUMCO". Here a pic of this exact model. ![]() The scooter runs great and it already has 8650km on it. 5000km ago I bought a complete transmission kit from NYC and also a 14 x 36 gear kit. Last week I've installed new upgrades. A9 camshaft, titanium valve springs, 150cc cylinder with the same head so now I have more compression and a performance exhaust. The problem now is, when I run slow it runs great but if I fully open the gas the engine practically stalls, so I supose it needs more gas in the mix(it also may need more air as I still use the stock filter and filter box). Today I went to a specialized shop to see if they can reprogram the Delphi MT05 ECU but before going all in with this (I think it's a must to do this) I need to find a bigger injector and fuel pump for this engine. Can someone tell me which "performance" fuel pumps could go well for this? And also where I can start to search for bigger injector replacements. I'm a carburettor guy and this injection thing is new for me. Thank you very much ![]() |
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#2 |
Join Date: May 2015
Location: Houston area
Posts: 1,902
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You are running lean after all those mods. One of our members, Randall, was able to add a rheostat to his wiring to vary the fual/air mixture in his Yamaha. It was not a Delphi system, but it had a mass airflow (MAF) sensor.
He isolated the wire to the mass airflow sensor, and added the rheostat to it.
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"Its not WHAT you ride; its THAT you ride" |
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#3 |
Join Date: May 2015
Location: Houston area
Posts: 1,902
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Here is a thread about working with the Delphi EFI on a CSC RX3. It is possible that you may be able to use some of the same interface cables and software.
http://chinariders.net/showthread.php?t=14758
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"Its not WHAT you ride; its THAT you ride" Last edited by wheelbender6; 12-30-2020 at 08:11 PM. Reason: add link |
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#4 |
Join Date: Sep 2020
Location: Spain
Posts: 3
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Thank you wheelbender6, I readed and participated on the post you linked some months ago
![]() The rheostat method is intresting, I'm going to read about it to see if it can help me. Also, for the moment I won't change the injector because it's too much work but I'm going to change the air filter and the fuel pump for a "performance" one. Do you have any prefered brand for the pump? or I can safely go with the generic chinese ones? Thanks! |
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