Love your project! It's almost identical to what I'm cooking up. A lot of the same parts, except I'm using an FC turbo.

Since you're not using a double pumper carb, you need to lengthen the arm on the accelerator pump so that it continues to push extra fuel during the opening of your secondaries. That lean spike you're getting when they open is very dangerous and could destroy your motor in a hurry! You will probably also need to enlarge the jet in the accel pump nozzle for a stronger shot.

i opened the secondaries and that seemed to help a ton! We have a metal shop so i was thinking of making a longer accelerator pump arm, what is the tolerance level on these? a couple thousands? how much boost are you planing to run on your setup?

I have no idea what the tolerance is. Sterling used to make them out of spare throttle shafts. I'm just planning on running around 5 psi initially and maybe 10 ultimately.

sweet. they pull awesome im pushing only 12 and its pretty impressive

hey guys so I need some help/ advice from the first gen gurus. I'm still having tons of problems when I try to go full throttle in my 7 currently it's set at 15 pound. in primary's it holds 15psi no problem. when I try to open the secondaries it starts sputtering and will not accelerate. when I try to use secondaries my AFR is 11.8 so that leads me to believe it isn't a fuel problem. Im at Wyotexh right now and talking to our hi performance instructor he says that my turbo is too close to the engine creating too much heat for the turbo to handle. which I don't believe. it makes a horrific shrieking noise when the secondaries open aswell can anyone help!!!

With the secondarys open what does your boost gauge do? I would check the waste gate for good tension and check your spark advance, And what is your fuel pressure at?.... just throwing ideas out there from similer issues.

Accelerator pump?


I agree. Should be fine.

Post a video?

redpro: when I go to secondaries the boost pressure remains the same. the fuel pressure at wide open at 15 psi is 21psi. I am going to put a video of what is happen up with in a few days it's been raining all week so the next nice day I'll take it out. I though about accelerator pump but if I try to ease into the secondaries it does the same as snapping them open. ooh and at full throttle its running full advance

Yep second


I think once you find out where the noise is coming from you will if you will fix the shutter... I can't help to think the two are related to the same thing ...very intressting oh love the build cant wait to do the same.:nod:

thanks it was a pain but what rotary isn't. it's definitely worth it though. hopefully tomarro I'll have a video up ao u guys can see what I mean

What? You are supposed to retard timing under boost.
At the very least have a locked distributor.

we tried doing a full retard and could not get the car to idle or accelerate.

how did i miss that good point Directfreak if the timing is to fast it will cause that to... try half retarded timing and see how it acts your going to have to change your idle and air to fuel a bit .. i hope your not using the vacuum advance.

kk I'll try that. no I pulled the vacumn advance so it's fixed in full advance I'll try retarding it most of the way and put a video of what happens how far retarded should it be?

to retard the timing under pressure could I use a msd boost/timing retarder with my msd 6a box I am currently using?

sorry guys was raining all day in PA today didn't get the car out I'll have a video up tomarro

your in Pa cool, YAY another dc area person .:nod:

ya where are u maby we can get a cruse cause I know a few others around