turbo questions

[sportrally88]

how are the t3/t4 turbos? is there something better?

how well do turbos work with carbs?

which head should i use? the 4ag bluetop, 4ag redtop, or the 4af/e head?

will it work well with dual sidedrafts?

i want to run 25-35 psi what will need to do? (at least 20)

[Flashmn]

First of all buy a book called Corky bell's Maximum boost and read it thoroughly, it will answer all of your questions and give you lots more information. You wont be able to boost your car with us answering just those questions.

You can really use whatever head you want, carbs work just fine, as for pressure. You have to do alot.

[punter]

As above do some research.

T3/T4 describes hundreds of possible turbo combinations, first work out what you need then find a turbo.

Why do you want carbs? yes they can work but EFI has more potential, and 4ages are efi to start with.

20+ psi is alot, you'll need new pistons at least. GZE pistons can handle that for limited use (street only)

And IMO find a 4age, the go very well when turbo'd and have the strong crank.

[Flashmn]

T3/T4 describes hundreds of possible turbo combinations, first work out what you need then find a turbo.

Actually no, t3/t4 is a hybrid turbo. They have a T3 turbine for quicker spooling, and T4 compressor for high airflow.

As for what style of compressor and turbine wheels,well.. thats up to everybody themselves to decide

[punter]

Originally Posted by Flashmn

Actually no, t3/t4 is a hybrid turbo. They have a T3 turbine for quicker spooling, and T4 compressor for high airflow.

As for what style of compressor and turbine wheels,well.. thats up to everybody themselves to decide

Exactally, hundreds of different combinations.

I just get pissed of when people say T3/T4 and give no more details.
Ie. wheel size or A/R.

[Flashmn]

Yea sorry I misunderstood your post

[sportrally88]

so i am going with the "f" head with gze pistons, and dual sidedrafts

if i run lower boost can i use the stock internals?

can anyone recogmend a good turbo for the 4af?

[punter]

Why why why??

I recommend any 4age, you get stronger rods and a stronger crank, a better flowing head and EFI.

Buy any old 4age, bore it, fit oversize GZE pistons, sort out a minifold and turbo, buy a mega squirt (or any other tunable ECU) , bigger ingector. Put it all together and job done.

As for reccomending a turbo, How much power do you want?

[sportrally88]

Originally Posted by punter

Why why why??

I recommend any 4age, you get stronger rods and a stronger crank, a better flowing head and EFI.

Buy any old 4age, bore it, fit oversize GZE pistons, sort out a minifold and turbo, buy a mega squirt (or any other tunable ECU) , bigger ingector. Put it all together and job done.

As for reccomending a turbo, How much power do you want?

why does every1 ...want to go 4age.....i gont want efi i want dual carbs.....4a is the block....g and f are different heads.....i can put a g head with gz internals and dual carbs...on my 4a block without doing a engine swap ......and my true goal is 200 hp or eventually 250 so ant suggestions that fit my protocols are welcome

[Flashmn]

4A-GE's are old engines. I'd rather take a 2nd gen 4A-FE head and use that, take it from a newer car (like 98) and you'll have less wear on it than on an early 90's GE

[sportrally88]

^^^^ur absolutely right ..........im thinking about getting gze internals aswell to help with boost ....and get the head rebuilt and bore increase, stroke increase. there is no reason to port an engine for boost is there?

[Flashmn]

porting helps.. but its also easy to screw it up.
Though for 200-250hp, I dont think you'd have to port it

[punter]

Oh you only want 200hp, then yes a 4afe will be fine.

When you said 20+ psi I was thinking 220kw+ @ the wheels

I keep suggesting a 4age as the are a stronger engine, and are more suited to performance.

IMO a smallport with gze pistons in it would be the best bang for buck.
Capable of big power and cheap.

Why do you want carbs so bad? they have more downsides than benifits.

Also there's not much room for bore or stroke increase on a 4a block. (you'd need a 7a block for that)

[Flashmn]

Oh you only want 200hp, then yes a 4afe will be fine.

When you said 20+ psi I was thinking 220kw+ @ the wheels

I keep suggesting a 4age as the are a stronger engine, and are more suited to performance.

220KW at the wheels... on a corolla ok, why not.

As for a 4A-GE being stronger, its crap, a 2nd Gen 4A-FE has a 40mm crank, 20mm piston pins. Not a 38mm crank and 18mm piston pins as a 1st gen 4A-F/FE. Also theres 4A-GE's with 38mm cranks and 18mm piston pins, but those are 3 rib blocks. Whilst all 4A-F/FE's are 7ribs automatically. Plus, not to mention, the block in itself isnt a problem, nor is the lower end, even if its 38mm. Pistons are gonna be the weak link, but he's changing them.

As for turboing, the valve angle of the F head is better as far as detonation than a G head. Its very hard to get a STOCK engine with a F head to detonate. Ofcourse add boost and it'll be lot simpler.
As far as performance, well.. theres a 250hp@9000rpm 4A-FE made by billzilla, also theres a club member here which has 200+hp in a 4A-FE 2nd gen. So I dont think thats a big issue.

Imho 4A-GE is way overrated for what its worth. Its not a bad engine, but I wouldnt put all my money on one.

[freakinbox]

why in gods name would you need 220kw (295 hp) in a corolla... Way more power than you need.

As for the 4afe being a weaker engine... If your building them up for that type of power both will no longer be stock. At that point your looking at the same block, w/e pistons and conecting rods you decided to choose, w/e valves you wanted, and so on. So it will be as strong as you make it