Tunnel ram try out
I finally get to try out my t-ram set up this weekend. Finally have this thing idling good with great throttle response. Took a long damn time. I could not for the life of me get the 1850 600s to work at all. I was going to go edey 750s but ended up going holley 650 dp carbs with profrom 750 main bodies. Changed the IABs from 73 to 55 with .028 IFRs and the MABs from 34 to 28 and 82 sq. jetted with no PVs. This tune came from a thread on another site with a very similar build to mine. I'm sure it isnt perfect but its way closer than what i had. No more loading up and fouling plugs and burning your eyes out. We'll see how it does at the track. I am very excited.
Not sure why the 55 IAB. The .028 IFR is pretty close but that IAB makes the idle dead rich.
When you closed the MAB from 34 to 28 you delayed the boosters coming on, and you will be even fatter at WOT. When you delay the booster, you run out of T slot and you put a hole in the fuel curve that is hard to fill with pump shot.
If you are driving on the street, I suggest using power valves. You can drop the primary main jet WAY down to clean up cruise A/F ratio, and use the power valve channel restriction to tune for WOT on the primary side. I’d expect at least an 8.5 PV to be about right, but if you have enough gear to get the RPM up, or you can pull more than 12 inches of vacuum at idle, you can go up to a 10.5.
You should have T slot restricters of about .072-.078.
An 82 jet is on the big side for a TR with two 750’s.
EDIT: I forgot to mention of you are using billet metering blocks, you need to fix the emulsion. I haven’t seen a single billet metering block be correct out of the box.
For a TR you can use .026 holes in the top and third hole and block the second and fourth holes. If you have 5 holes, block 2,4 and 5 from the top. I don’t go over .028 on emulsion for TR’s. At least to start.
