4AGTE Build Specs

[PuGZoR]

20v head on a GZE bottom end, or using GZE pistons, would be fine, but yeah, stock 20v pistons are high compression. High compression + decent amount of boost = detonation. You could run a low amount of boost, but for the money you'd be better off doing NA mods like cams, porting, valves, etc. It's pretty much essential to have a low compression ratio for turbo applications, no more than 9:1. GZE pistons come in 8:1 and 8.9:1, depending which generation. You could always throw a very thick headgasket on a 20v to turbo it, or a decompression plate, but, you wouldn't have the strength of the GZE pistons, which from my impression, are quite well built. Mind you, I've always looked at the forced induction route so I have no idea on how 20v pistons hold up, I just know they're high compression and therefore unsuitable.

[350hp4agte]

thanks i understand hi comp + boost = bad but ingeneral people say dont bother going down the path of 20v turbo i just wanted to no if the only reason was money for such things as low comp pistons ect i've almost spent 10g's on my 20v turbo (not finished yet) just want to no what trouble people have had or if the people saying it are just saying its easyer and cheaper to use 4agze and turbo it

also i boosted my stock 20v for well over 8 months ran sweet never faild 6psi made 158hp atw from memory

[PuGZoR]

Yeah, would say it's mostly hassle and cost for low comp pistons. There aren't many turbo's that run efficiently at low boost too, so that kind of limits things as well. A satisfactory turbo set up (for drifting and street use, in my opinion) should be in the area of 220rwhp for a 16V 4A, and isn't hard to achieve if you select your components correctly. Further more, cost difference would probably be minimal between that responsive 220rwhp through a 16v 4AGZE block and head, and your 158rwhp 20v 4AGE. Having said that though, you will have far better bottom end torque and power, but the GZE built turbo setup would still be a lot quicker from around 3KRPM onwards. So to summarize, the GZE block/head combo is probably the most cost-efficient and hassle-free turbo 4A routes, but it's still viable to do a 20v turbo conversion if you don't mind changing a few things.

[350hp4agte]

cheers once again, im hoping to make over 350hp atw with my new 20v set up up so i'll let you no how it goes

[drft86]

had a n/a 4age (195psi in all 4), put a turbo on, 8.5psi, thought it would last a bit. got 8 laps of qr only, made 174.4rwhp

[ToySprinta]

the 2nd hand bigport motor i chucked in for the last drift round lasted 1/2 the day, then blew a head gasket, and then kept running the rest of the day a bit hotter

[JDMJNKY]

just a quick update i have a t28nonbb on my street sprinter making 129.7kw @11psi
running a t50 and t seies has been running sweet untill out of nowhere the other morning i putted down my road to warm my car up turned up a hill went from first to 2nd gear not pushing it at all and bang #1 t50 gone hasnt made a noise has been shifting sweet and all of a sudden easy driving and bang!!

has serious response with the turbo no top end at all but is a stock smallport ze with a trd metal headgasket.

[reecegze]

i have got he same setup going on my ae86 t28 non bb with my ae92 afm running standard ecu... i was hoping for alitte more then 129kw from the turbo at 11psi , i think i might needa invest in a microtech and injectors to get 150 kw


<div class='quotetop'>QUOTE (orangechargd86 @ Feb 1 2008, 09:09 PM) </div>

[cuzzo]

With a aftermarket ecu the least you will get is 156kw atw. bout 12psi.

[skin]

t28 off gtr the bees knees

great size