Any Good Low Boost Single Turbo?

[discopotato03]

Novel thought but I wouldn't be turbocharging an NA EZ30 either , three litre high compression motor with split aluminium engine cases . Hand Grenade territory I think .

I'd think firstly what to I want to use this thing for and is there something else thats a better basis to start with . It it has to be a Subaru for dune duties can you option an EJ25 turbo version ? If so it would at least be a factory turbo engine and there are lots of Rex higher performance bits for EJ25's nowdays .

If its a performance AWD road wagon you need you could think Stagea and RB30 .

Your call but turbo flatulence fours a right royal PITA and they sit WAY too far forward in Zoobs to make a good handling package . Even with the fours you can't shut the engine backwards without screwing up the front drive shafts angularity and then theres the 120Y gearbox unless you have the long and heavy 6 spd one .

Handling , so much is needed in those Y bone and strut front ends and if you can stop the body roll and geometry change they're hopeless off road .

The bottom line is that Forrester's and Liberty's are not performance wagons and without spending really stupid money I think a well sorted RB30 Stag would run rings around them - on the blacktop .

That aside I think you're on the wrong track looking for X amount of kilowatts , I'd be looking for an adequate amount of torque and having it over a wide enough range to suit the gearbox ratios and be usable .

Anyway if you are determined to go this way you could do worse than to look at the turbos Ford has on XR6's because initially they were looking for low boost performance admittedly on a four litre engine . Their solution was a GT3582R using the largest 1.06 turbine housing and a smallish T04E 0.50 compressor housing . I suppose you could emulate this with a GT3076R (1.06 or 0.82 turbine housing and a T04B 0.60 A/R comp housing) but its an experiment at best and theres no guarantee it would be a success .

Sorry but IMO Subaru's paint you into too many corners if looking to modify them seriously , its because they try to engineer them to be smooth comfortable things which the majority of their customers don't intend to throw around too much if at all . I reckon the factories only really tried hard when they had to build road going homologation specials to comply with production based race/rally cars ie 5000 road cars and 500 sporting evolutions for FIA Grp A .

Things like Walkinshaws/R32 V Specs/RS500 Sierras/RS Evos/STi etc etc .

Homologation specials have been sadly missed in the last 10 years but thats what you get when motorsport becomes a spectator sport and the regulating bodies focus purely on profits .

A .