Needed input, 7age vs 1mzfe Options

[Einhander]

Ok, over the past few months i've been gathering parts for a 1mzfe swap. I finally have everything But the ecu, but that's not a big deal. I know the motor will fit, that's not the issue. And i don't want to make huge power 280-300hp at the most.

But here's the delima, i have everything for the 4age head converison. I would like eventually to go turbo and the 1m is not going to leave a lot of room for this, unless i go crazy on the engine bay, and piping will be a pita. Plus the turbo 7age has already been done and has sources for reliabilty, where as the 1m really is not a heavily document motor as to it's abilities.

Now my question to you guys is if given a choice, with a goal of 300hp which would you choose?


this is something i am going to complete over time, since the celica is no longer a dd, and i work almost continously, hopefully by late summer it'll be done.

[Kwanza26]

Lots of stuff here...

First off, the intake manifold. Typically speaking, the longer the runner length, the more intake charge, the more velocity, more torque. Between the smallport and bigport, because the bigport is dual runner, it's actual volume might be the same as the smallport, if not a bit less. The bigport intake manifold was designed for TVIS and was designed for torque, so its runners are slightly longer than the smallport's by maybe an inch or so, and from the looks of it, if you combine each individual runner, they probably won't add up to more volume than the smallport. The smallport on the other hand, IMO, might flow just as well as the bigport's because it's a single runner manifold... but because it's shorter, it won't have as much velocity charge. That's just the intake manifolds... The heads alter this a bit. The smallport manifold does bolt up to the bigport... but the ports won't line up. Basically nik... if you want to use the smallport intake manifold, you can, if you don't mind purchasing a bigport-->smallport adaptor plate. They're probably about 110-115 shipped from Techno Toy Tuning. These are usually for installing smallport 4AGEs into AE86's using the AE86's RWD bigport intake manifold... but will work just opposite. You might need some longer studs though... I am more than happy, however, to replace that intake manifold for you. It's up to you.

Now for compression... lower compression, believe it or not, will hurt the engine's ability to make power. The idea behind lower compression with forced induction engines, is to make them safer and more reliable. Lower compression with boost is more resistant to heat and will detonate less, and be much cleaner because it requires less fuel to prevent leaning out. Compare the power differences between the 1st gen 4AGZE, 8:0:1, and the later models JDM models at 8:9:1. The power difference between the two engines (145 and 165-170 respectively) is due a lot to the compression difference. The boost difference between the two is small, I think 8psi for the old one, and 9-10 psi for the newer ones. Basically, higher compression can increase potential power per psi, but will also require more fuel. Personally, if I were to do a 7AGTE... I would just get some JDM 4AGZE pistons (8:9:1) on the stock bottom-end. These are high enough compression that the car won't be a total dog during boost lag. If 250-300 whp is the goal, I can see the stock bottom-end holding that. AT the most, I'd have the crank and rods reworked a bit, to get rid of weak spots that are typical of production casting process.

Now for injectors... depending on which harness and ECU you get, be careful with your injector choice. Make sure you match impedence... which most of the older 4AG's use low-impedence, while the newer ones use high impedence.