4AGE 20v Options

[turboinduction]

Hey everybody!

I need some help. I'm looking for aftermarket potential on the 20v silvertop. Something other than "Blitz turbo" and "why not blacktop." Because I cant afford the Blitz turbo and the blacktop is weak IMO after doing research. I need something like internals, manifolds, etc. Any help is appriciated.

-Ti

[Coomer]

There's a huge aftermarket for all 4A-GE motors, but most stuff made specifically for the 20V ones can't be found cheaply in the US(Well, not cheap at all, but even more expensive in the US.)

For pistons, you can use 4A-GZE pistons, but unless you have them cut for the indent for the extra valve, it turns the motor into an interference motor, where if the timing belt breaks your pistons will hit your valves and do severe damage.

The silvertop's block, crank, and rods are equivalent in strength to the AE101 4A-GZE's block, crank, and rods. Some people say that the rods are exactly the same, but everyone always argues that they're not the same, but very close and equal in strength.

For exhaust manifolds, anything that fits a 16v 4A-GE will fit a 20v with modification so that the outer bolt holes match up. Nik is working on fitting a Honda B-series turbo manifold to a 16v 4A-GE flange...that might be a good option for a turbo setup. You will most likely have to go custom on the exhaust manifold.

The motor is really good for boost...the stock head gasket and such is fine for mild boost. In stock form at 5-6 PSI with exhaust, I've seen numbers from 185 whp to 215 whp. The key is tuning. It's very important with any turbo setup, but more so with a motor running 10.5:1 compression.

For more boost and more reliability, 4A-GZE pistons are a good upgrade. They bolt in and lower compression to 8.0:1 or 8.9:1, depending on which pistons you get.

Also, when running more than a few pounds of boost, a new intake manifold plenum is required, as the stock unit will leak or be destroyed by lots of boost.

You'll most likely want to go with a standalone EMS if you're going turbo. Many people go with Megasquirt(and a Ford EDIS-4 ignition setup) for a low-cost solution. The AFM sucks for boost, and you need to be able to precision tune everything(and you'll want to get the car dyno-tuned professionally) if you want a reliable setup.

But yeah, the silvertop is a great motor and is excellent for boost. I considered boosting mine, but I've decided to invest in a new camera and stuff instead.

If you've got more specific questions, post 'em up if they haven't been answered through searching.