trueimport

iTrader: (8)

will a hybrid t3t4 bolt up to a stock S5 manifold utilizing the stock dual waist gates but those would be ported? ther reason im asking is because i called cheapturbos.com today and spoke to i think his name is kevin and he said that there is no t3t4 that will bolt to a stock manifold off an S5 he said that the only way that could be done is with a custom flange, is he right or will it be able to bolt right on????

Infini IV

T3/T4 will not bolt up. The S5 flange is only S5 Rx7 specific (well S4 or S5). It is not a T3 flange nor a T4 flange.

trueimport

iTrader: (8)

ok thanks, so what would be needed to get that size turbo on my S5?

Infini IV

A typical T3/T4-sized turbo would be too small for a rotary. Look for a T4 based turbo. You would need to get a manifold (HKS cast T04 manifold = ~$250), HKS external wastegate, downpipe made, along with fittings and other accessories.

A cheaper solution is to upgrade the compressor side of the turbo and stick with the stock S5 turbine housing and wheel. Check out BNR.

bcty

you can put a T4 cold side on your S5 turbo.. very very nice.. my bud has one feels great!

rotorheadturbo2

Why is a T3/T4 turbo to small for an RX-7 if it spools faster, handles more boost and flows better than the stock turbo?

Not all people get gigantic turbos just because they want one better than stock, especially if their using a stock ported engine.

RETed

Get your head out of your *** - you're talking about turbo sizing for a piston engine.
We're not talking about piston engines.
A 13B can spool a full T04 no problem, so why not use a full T04?

Why are you so stuck on T3/T4 hybrids?
These T3/T4 hybrids were designed for tiny (under 2.0 liter) 4-cylinders which can't spool full T04 turbines due to their small displacement.

You really need to read up on turbo sizing for a 13B.
You should also read up on why excessive exhaust gas backpressure is BAD for turbo engines.


If you can't afford a properly sized turbo for your 13B, stop ******* with the car in the first place.
Speed takes money.
Performance takes money.
Cheap will bite you in the ***.


-Ted

MrDirt

Listen to RETed. Although he may come across as harsh, what he is saying is 100% true. If you want an aftermarket setup for fairly cheap, that still spools well, look into the Garret/AiResearch T04B v-trim's that you can get for about $400 brand new.
Things you will also need (basic list, there is more):
-T04 manifold, preferably divided to match the divided turbine housing that will come with most T04's
-Custom oil lines
-Fuel control, preferably in the form of a stand-alone, utilizing larger injectors

rotorheadturbo2

Yeah kind of harsh allthough he doesn't explain.

I'm already using a 60-1 kit.

rotorheadturbo2

If this isn't true then why is the stock assembly so small? It can't be more restrictive.

MrDirt

Oh, for some reason I thought you were the original author of the thread. Either way, if you are already using a 60-1, you should be well aware of why a T3 housing is no good, pending you've ever seen one in person compared to the T4.

MrDirt

The stock assembly is small because the power output of the car isnt high at all. They can therefore utilize a smaller turbine housing for quicker spool. Even if the factory turbo is smaller than your aftermarket turbo, which it obviously is, go compare the stock FC turbochargers to most other OEM ones for small cars. Besides the obvious benefits to a T04, they can also be had for just as cheap, and no one even makes a T3 manifold for RX-7's.

RETed

Bingo...
It's the bean counters that are calling the shots in terms of budget.
Why go with a bigger turbo (which is usually more expensive) when you can go with a smaller one and save money?

The stock fuel injectors max out at around 250bhp at the flywheel.
It is not much more over the stock power ratings.
Wanna take a guess where the stock fuel pump maxs out?
Yes, right around 250bhp at the flywheel.

Mazda also designed the car to produce good power down low.
Therefore the small turbo was just the ticket.
Everything is optimized for good, low-end power, ~200bhp output, and about 7psi of boost.

When we start to modify things, we are usually WAY outside of those parameters.

Sorry for the harsh reply- Mondays tend to get me grouchy. :P


-Ted

rotorheadturbo2

No problem,

I have a 60-1 and a T3/T4 (actually a couple of them) and a while ago I had to decide which one I wanted. I really didn't want to setup for 450-500 horsepower, so i thought maybe using something smaller so I would have a longer range of boost. I though this because, instead of having a larger turbo with stock engine ports and waiting something like 5K rpms to reach boost and then just shifting out of it, I could use something that will spool quicker and bring up the power lower in the rpms.

Remember it's not how much max power you have, it's how you get to that power. (or something like that)

all well, it dosen't matter anyway, i went with the 60-1 but i can't say how I like because i'm not finished yet.

Thanks, R.J.

MrDirt

If you want a smaller turbo, why not just get a smaller T04?

fritts

iTrader: (5)

Aren't most of the early GT35R's T3/T4's. Producing 400+ whp doesn't sound small to me, plus you get that great spool.

MrDirt

Some people just wouldnt let the lack of a divided T4 hotside stop them from getting such a good turbo. Just because it is making a lot of power with good spool, doesnt mean it is an optimum setup. This is exactly why all of the RX-7 guys are REALLY going nuts over 35R's now that they are available in the divided T4. The GT35R with the T3 is okay because that is such a good turbo. However, now that it is available in the divided T4, you would have to be retarded not to get that. In comparison to other, lesser priced turbos, there is no sense in being too hasty to find a full T4 turbo.

RETed

There's a reason for this, and it's staring you in the face...


-Ted