Sluggish Acceleration

[Duffman]

Am having similar problems with hard acceleration while driving fast. Believe that it is fuel issue; not enough fuel filling bowls at desired time causing a stutter or falter while under load. Check your fuel pressure for level and consistency and make sure your float bowl needles are good. I put a fuel pressure gauge in line to see how my levels are. Noticed that it ranges from 2 to 4 psi and is inconsistent and varies. Have ordered new mechanical pump to see if that helps with my problem.

Edited October 26, 2011 by duffman

[CW240Z]

Am having similar problems with hard acceleration while driving fast. Believe that it is fuel issue; not enough fuel filling bowls at desired time causing a stutter or falter while under load. Check your fuel pressure for level and consistency and make sure your float bowl needles are good. I put a fuel pressure gauge in line to see how my levels are. Noticed that it ranges from 2 to 4 psi and is inconsistent and varies. Have ordered new mechanical pump to see if that helps with my problem.

Good idea, my Porsche had fuel delivery issues as well so I hooked up a cheap fuel pressure gauge to make sure it was getting the right amount of pressure.

[Zedyone_kenobi]

Just a note on timing, a stock 240Z should run 5° BTDC at idle with a stock dizzy, not 17°. There is WAY too much mechanical and vacuum advance built into our dizzies in the states. I have had mine recurved to a european advance curve and I run 14° BTDC at 750 rpm.

[sblake01]

Just a note on timing, a stock 240Z should run 5° BTDC at idle with a stock dizzy, not 17°. There is WAY too much mechanical and vacuum advance built into our dizzies in the states. I have had mine recurved to a european advance curve and I run 14° BTDC at 750 rpm.

My bad. I took those numbers directly from the 1972 FSM tune up section and I now realize that those would have to be the Euro numbers because, right below in on the chart, it says 5°/750rpm L24 SU twin emission control.