Stock 4AGE Smallport Turbo Choice please

[trdee]

When I had a contact in the parts division I could have bought a complete AE101 GZE short block for $2249... :/ I should have just fucking bought one and sat it on the shelf at home lol

[JustenGT8]

Sweet...probably easiest solution for most....newbie question seeing the knowledge sources are here and listening i don't suppose the GZE shortblock will take the silvertop head? ie without a pistion swap? I was hoping (naively) that the lower comp deck height might negate any valve clearance issues?

[maj]

Pretty sure it will still need new pistons.

I don't particularly see the benefit of using a 20v head on a plain old 4AG block. If you were doing 7A/9A yeah sure, but for simplicitys sake, you will get better yield with less mindfuck on a 16V head.

[JustenGT8]

already has 20v...want to add boost and keep it alive as pragmatically as possible. No bells and whistles required, just enough to get the job done

[maj]

Options are to keep it low boost as discussed here, or swap out for lower comp 20v pistons. Going GZE bottom end isn't going to help much at all.

If you don't have any urgency doing this, I could sell you a GZE long block for a case of beer when I'm done with it in a year or so.

[trdee]

Sweet...probably easiest solution for most....newbie question seeing the knowledge sources are here and listening i don't suppose the GZE shortblock will take the silvertop head? ie without a pistion swap? I was hoping (naively) that the lower comp deck height might negate any valve clearance issues?

It can be done on factory pistons. Fandio was running a blacktop head on a stock 8.9:1 bottom end for a good while.

Just don't skip a tooth on your timing belt or it will end up like your UZ as the engine will obviously be an interference design since the flycuts are in the wrong places for a 20v head

edit; wouldn't it be easier to just get some aftermarket turbo pistons for your silvertop though, rather than sourcing a GZE bottom end? The only difference between a silvertop bottom end and an AE101 GZE bottom end are the pistons. Everything else is literally identical. Crank, rods, oil pump even The block is slightly different in how it mates to the sump but otherwise it too is identical.

[JustenGT8]

Yeah look im no expert on the A series so happy to take advice on the best/easiest way to get 250hp flywheel. There is a set of rod/pistons on here for sale and even just a set of new 20v forgies looks cheap. light bore and hone and no other machining required...could be a cheapish exercise?

[trdee]

250 flywheel HP is only around 140kw at the wheels innit? TBH you could probably do that on a completely stock silvertop with mild boost and a good tune without much issue, especially if you go E85. If you want a bit more headroom, then some 8.9:1 AE101 GZE pistons would be the cheapest next option, followed by a set of turbo 20v forgies from CP or similar.

I would throw on a TRD metal headgasket at the same time (they are like $80 so why not). Stick with standard head bolts, the standard size ARP ones seem to suffer from head lift and the next viable upgrade is oversize ones, which is way overkill for you anyway. Rods are not necessary, norminator is a good example of what the stock rods (and pistons!) can take

Also - here's some inspiration for you: https://www.youtube.com/watch?v=ogrtrMpMun4

[maj]

Not even, if you factor in about 30% drivetrain loss, 250HP at the fly is 130kW at the wheels.

Low boost that sucker until it pops, then rebuild it to handle more.

[trdee]

I was using 25% drivetrain loss. Either way, anywhere between 8-12 psi will see you barrelling along at or above the power target. A td04 would be well sized for that operating range too.

I think the KISS principle applies here. Just get an MRP inlet plenum, a TD04, some E85, and boost your standard silvertop Justen

[JustenGT8]

Pfft what world of drivetrain losses do you guys live in? more like 160rwkw based on a more realistic 15-20% drivetrain loss. But yes either way your advice sounds the go...pistons, TRD HG and fresh Toyota head bolts. Just need to decide on boost device...tiny turbo or SC if some sort. It has a nice zorst so inclined to go SC and have a bit more throttle control to boot?

[trdee]

I actually prefer the power delivery of turbo cars so I'm not the right person to talk to regarding that. Either way with vvt, e85, comp in the 10s and a small turbo, i think the response is gonna be pretty bloody good anyway on a 140-160kw silvertop

edit; did you watch the above vid yet?

also i used a 25% loss assumption because i have no idea what drivetrain you are using. is it gonna be a corolla transaxle or are you going FR with a rear diff etc? (slowly mining for more info on your build )

[fixeruperer]

Never had a problem with stock arp studs. Even stock head gasket is good.
Damm 2200 for a short, id rather build one.
If ya set on low boost, even tho gze pistons are strong, they are heavy. Id run lighter pistons.
Give it everything else if its not gonna be boost.

[trdee]

The arp studs only seem to be an issue with the 20v head. Quite a few people reporting head lift with arp studs on a 20v head at relatively low boost levels where the stock bolts had no issues.

[fixeruperer]

Gotchya
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