Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor
Fine tuning Q-jet
bob69:
Quadrajam, the jury is still out on the summit heads. I've let the 200r4 control the shifting while testing. This 200r4 shifts around 4200 rpm on wot (a 1986 monte carlo 305 - not the SS). No where near what the engine is capable of. After I finish tuning in the carb I'll be able to see how they run at higher rpms.
quadrajam:
10-4 thanks.
Nice work finding the fuel pressure issue. That will
drive you nuts.
von:
bob69, My 2004R also shifts around 4200-4400 rpm even after I've done considerable governor lightening. It's a bone stock 350 engine but I'd like the WOT shift point a little higher. If you figure out a mod that works well, please let me know. Thanks.
bob69:
Von, the 200r4 is not an easy tran to hop up. Changing the governor weights is the easiest mod, but may not get you to where you want to be.
The vast majority of 200r4s were installed in low performance v6 and v8 grocery getters. The tran, specifically the valve bodies, were designed with early shift points for low performance engines. Modifying the governor may not be enough to get the higher shift points you're looking for.
However, GM did make a 200r4 for high performance buicks, oldsmobiles and chevys. They are found in Buick turbos, olds 442 and monte carlo SS. The valve bodies were designed for high performance. They were designed for higher shift points. From what I've read the low perf vb can not be modified to match the hp vb.
Look up the buick forums (turbobuick, gnttype, v8buick) for in depth information on the 200r4s. The buick GN and T-types have loyal followers and they love their 200r4s.
von:
Yes I knew all that about the 200 4R. I built mine. I was hoping to find out a valve body mod to raise the WOT shift points but sounds like unicorns. My part throttle shift points are perfect.
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