looking to see if anyone out there has some suggestions on a bogging down issue I'm having. It does have a turbo but the issue im having is way before the turbo is doing anything so I've put it in this section. please remove if thats not correct!
Car's spec is -
stock head, crank and pistons.
Metro turbo T3
Stock turbo regulator
Sytec fuel pump
HIF 44 Turbo carb recently rebuilt by AC Dodd with 5w-30 dashpot oil. balance pipe blocked off and part throttle lean off connected.
Lucas electronic 65D distributor
The problem I have is any sharp movement in throttle and the engine bogs down/goes lean. But if you slowly apply throttle it will rev up.
I went out for a drive the last time I looked at the car 2 weeks ago and recorded a video of a fuel pressure gauge i have between the carb and the regulator. its set a 3.5psi at idle but when you apply throttle quickly you can see that the pressure is dropping. I thought that must mean the pump was on the way out as the regulator is a brand new one from mini spares, so I replaced the pump with the Sytec unit and still have the problem.
Looking at some threads with people having similar problems, people seem to put the issue down to timing. So today I have replaced the old turbo dizzy with the 65D and set the timing to 6 degrees at 1500rpm with the vac pipe disconnected. I still have exactly the same problem, any sudden application of throttle and it bogs down and goes lean.
Does anyone have any ideas? I've changed so much on the car now that im starting to think there is some other underlying issue with the engine its self despite it and the turbo having been rebuilt less than 500 miles ago!
Any suggestions of what to check or do are really appreciated!