7AFE Internals Performance, NA Performance Options

[GTAlmond]

Does anyone know if there are any performance internals out there somewhere for the 7AFE engine.

This is sorta what i really want to do.

4A-GE Cylinder Head, (Havent decided red or black top)
Lightened and shorter stroke crankshaft, (I know it might lesson the engine size because the stroke will be smaller, but i think the higher revs will fix that.)
Shorter & lighter & Forged piston arms
Flatter and shorter & Forged performance pistons.
Lighter valves.
Harder valve springs.
Lighter camshaft with a bit more lobe to them.
Bore out the cylinder to what is feasible.
Pulleys.
Intake
Injectors
Fuel Pump

And then

6 speed tranny??????

And then once i get that far, after a couple years of recouperating the cash flow, i might buy in for a turbo.

I found a couple places that actually supply the stuff i am looking for, But just need some ppl's opinion

Is it feasible, reasonable, ect ect.

Thanks all.

GTAlmond

[nik]

ask edo he has a n/a 7afe thats built

all so from what you said i would go with 20v black or silver top with a 6 speed tranny swap then beef up the internals and bore it out to 1.8l heck sleve it to 1.9l
just a few ideas

This post has been edited by nik: Dec 7, 2004 - 1:28 PM

[Kwanza26]

ask edo he has a n/a 7afe thats built

all so from what you said i would go with 20v black or silver top with a 6 speed tranny swap then beef up the internals and bore it out to 1.8l heck sleve it to 1.9l
just a few ideas
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These engines aren't exactly the sleeving type... just machine bore... ;]

Umm... don't go 20V unless you're ready to set-up some sort of standalone or wanna scour through endless piles of wires and diagrams (or lack of). It's hard... trust me. The stock 7A bottom end should be able to handle upwards of 7K pretty easily. I believe many of the Euro versions are fuel cut at 7k rpms... so a little bit beyond with some re-conditioning should be fine. You don't have to lose stroke... in fact, if you feel you need to lose stroke... just get rid of the engine all together and get a 4AGE as mentioned. Much stronger all the way around. As nik said... you can bore out as big as 83mm and keep the 7A stroke value of 85.5 which will put you around 1.9 liters. That's plently and pretty much max as far as bore goes. People have fitted 2ZZGE pistons into the 7A block, possibly the 2ZZGE rods will fit also with some machining. The A series engines are some of the MOST well documented engines in terms of building and tuning for import cars.

As for parts... you'd want a longer rod if at all possible. Longer rods reduce stroke force on the crank because of less piston travel, but also lose high revs due to piston dwelling. It's a give take game. The stock 7A bottom actually has a pretty decent rod/stroke ratio when it comes to revving. It's as good as Honda B18C bottom-ends and those can spin upwards of 8-9k if built... Another general idea when it comes to valvetrain... if you choose to go with lighter valves, harder springs are less neccesary. Hard springs, although can protect the engine and increase revving potential, can also have a bad effect. Gotta work valves, springs, shims, retainers, etc, all in conjunction. There are many many things that I can cover... but that'll just get too long. Engine building and tuning is best learned through experience, instead of taught through words.

The reason you don't see a lot of Toyota guys go with n/a set-ups... simply because of custom work and finances. It's hard to plan things and then realize there is a HUGE lacking of parts you can use. Things always end up being custom and always end up becoming very expensive. Toyotas in the US also have a big lacking in performance tuneability. 90% of Toyota cars in production today that are sold in the US are designed for economy and low-end response. These engines are difficult to build and tune n/a because the results are always not quite worth the money. People would rather just throw on a turbo set-up or Supercharger and gain immediate power. Bang for the buck. I however... crave the high revving power of n/a so I'll always look to that route. I'm probably one of the very few here and does... Personally, I'm gonna undertake a 7AGE 20V project. I basically have all of the parts and the tools to get it done. It's whether or not I can finance it. If I sell one of my cars this December... then my 7AGE 20V project is a GO and I expect to have it up and running by next year. Good luck... feel free to ask if you have any inquiries...