well as of now, im in the process of turboing my KA24,
my plan is to use a megan turbo manifold, weld a T3 flange and cut/weld a TiAL 38 wastegate flange to it also.
i wanted to use a Garrett GT30, but theyre just way too expensive. so i came across this site(http://www.usedturbos.net/)
and on there, the have a rebuilt Precision 60-1 T3/T4 turbo for around $525 and also a turbonetics T3/T4 for around the same price. so i want to know, has anyone ever bought from them? I've heard good things about precision turbos, but mostly from high HP Supra guys. My goals are 270HP for now on a stock block, then i want to raise the boost when i buy forged internals and a better turbo manifold.

also,
do you think this a good sized turbo for my application? or should i go with a smaller turbine?

-thanks

The turbo's you listed will both support more then 400whp depending on exhaust housing choice. You'll have full boost between 3200 and 3800, again depending on trim selection. If they have a T3/TO4E with a .48AR exhaust housing you'll be happy with the amount of lag and it will support 400whp.

It really depends on what your final goals are.

WD

Wow, great info. Thanks.
my final goals are 380-400HP and full spool by 3800 revs.

Why not use the new ebay cast t3 manifold? Less work and more reliable than the megan.

As for turbo, find a used 50 trim (.63ar) if you can't find one for a decent price. They should be <$650 new.

I'm running an ebay unit "supposedly rebuilt" but anyways it works and doesn't smoke. Total time on the car is about 6k miles since I finished it back in '09. I'm running 11.5psi and making around 270whp

A .48 ar would be great for the stock block, then you could replace the housing in the future for a built motor.

I am stupid and cannot grasp all the turbo lit.

I have a .48 exhaust housing, I can upgrade just the housing?
My turbo makes 5psi(set) at 2500rpms(huge front mount), would a larger housing just give me lag?

neverlift wrote:I am stupid and cannot grasp all the turbo lit.

I have a .48 exhaust housing, I can upgrade just the housing?
My turbo makes 5psi(set) at 2500rpms(huge front mount), would a larger housing just give me lag?

Yes you can use a larger housing.

The larger the A/R number, the more space between the wheel and the housing itself. This allows for more overall flow, but it increases lag because the exhaust bypasses the turbine wheel. The smaller the number, the less gap between the housing and the wheel. Therefore more exhaust energy is acting on the wheel, which decreases lag.

The flange size itself works the same way, a T25 has less lag because it forces more energy to act on the wheel then a T3.

This is why the end goal is very important. Without an end goal you can't really pick the best turbo for your project.

WD

the smaller the a/r the less space there is for the engine to exhale. you'll spool faster since more exhaust energy is focus'ed on the turbine wheel. a larger a/r will allow the engine to exhale more but will have less energy focused on the wheel. it will increase lag but have more potential to make more power since it wont start to choke in the turbine housing

s13drifter88 wrote:the smaller the a/r the less space there is for the engine to exhale. you'll spool faster since more exhaust energy is focus'ed on the turbine wheel. a larger a/r will allow the engine to exhale more but will have less energy focused on the wheel. it will increase lag but have more potential to make more power since it wont start to choke in the turbine housing

yeah I got it when wd said it...
thansk wd

Welcome