Quote:
Originally Posted by scribb
Quick update:
Committed to the Kelford cams. Had a very disappointing call with WebCams--they sounded dismissive when I said I wanted cams for a 2uz, saying "well, they start at $2700", sounding like they just assumed that would get me off the phone. It did, but less about the price than the stand-off-ishness.
Found a tuner, which was a lot harder than I anticipated. Finally found him by looking up dealers for some of the standalone ECUs. He's never done a truck, but he's a Toyota specialist, and has done a lot of SC400s (1uz) and proved in just a few minutes of discussion that he really knows his stuff and is really excited about working with a machinist on a 4Runner motor. I'm not going to out him until we get down the road.
After some discussion back and forth, I think I'm convinced to go with increasing compression to 10.1:1. This will pretty much cut off the option to do much with boost, but the amount of grunt we'll get out of the motor is what I really want. It's going to mean more machining--smoothing out all the rough edges of the internals to maximize flow, and porting the heads properly. The good news is, with the Kelford shipping delay, we'll have more time to get the machining right.
Starting to worry a little bit about the next weakest link with the added horsepower. The tranny is getting worked, but I haven't done anything yet with the transfer case, shafts, diffs, etc. May just steel myself for some trial by fire close to home.
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The transmission will need a little help with heat, us 3rd Gen folks have that issue when pushing a lot of power through the stock transmission. Do 4th gens have an external transmission cooler though or is it just routed through the radiator? I'm on transmission #2 since the PO had to replace it due to the supercharger burning the fluid.
I commend your build though. I just found out about Yota1 recently but already did my engine swap. Budget didn't allow doing anything crazy though but I would have loved to increase the bore and put some real-deal pistons in. However, I do give a word of caution about the camshafts: the reason why I had to replace the engine was I installed camshafts with shim spacers. Avoid those like the plague. And yes, you figured it out already but if you add any sort of lift the springs do not hold up and will go out of adjustment really quick so stiffer springs are must for any aftermarket camshaft that increases lift.
For smog, just keep the cams conservative without too much overlap and you'll be ok. However, the stock ECU may not play nice with all that extra power, you'll probably be looking at upgrading the injectors (fine in closed loop but might run crazy lean in open loop with stock injectors), which means you'll need a way to drive them properly so a piggyback will be in order, then a way to read AFR's so you'll need a wideband... catch my drift? Toyota ECUs are an absolute pain to tune though.
When do you expect your engine to be back up and running?
