1988 rx7 se turbo engine and drive train.rtek 1.8 with 750s and 1000s stock block with 53mm hybrid turbo. front mount after cooler had 1000 cc injectors and it would get really rich right at 3800 when secondaries would kick in. I have a safc to help tune the car. have 30 percent fuel removed to help it. I tried 750s in secondary spot and would lean out above 10psi would get about 12.5 afr to 13. so went back to 1000s. I don't know anything about duty cycle. at what horsepower are 750cc injectors maxed out at?

 

Im not even going to try to say I know whats going on with RTek, never owned one. However I am running a MegaSquirt 3 pro fully sequential 550/720 with supra TT fuel pump with a Knightsport RF320 turbo and so far do not run lean at the top. Before the Supra pump, It ran very lean after 12psi.

I say all of that I don’t think you are close close to maxing out 750 primaries with 1000 secondaries on stock block. Are you running the stock fuel pump still?

 

I was really rich with 1000cc secondaries so I switched back to 750cc secondaries and it leans out above 12psi. walbro 255 fuel pump. I know I have enough fuel since my 1000s take me into the 9.0 afr. do you guys think my baby 53 mm hybrid turbo can max out 750cc injectors?

 

what primaries are you using? 550s?

 

I thought the rtek 1.8 limitation was 750cc injectors?

And why have a safc AND a rtek? Doesn't seem like the too would work well together

 

Rtek 1.8 is designed strictly to run 720x4

Rtek7 S4 TurboII v1.8 Instructions

If you need more fuel you will need the 2.0 or another method of engine management