nathandarby67

A guy here wants to sell me a turbo, and I was wanting some opinions about this setup before I spend my money. I am not that familiar with the different aftermarket turbos available for the FCs, so all info is appreciated. I want to hear all the pros and cons. Here is what he told me: it is up graded to TO4 with a Garrett compressor housing with a .60 A/R and a 40 wheel trim on the compressor side. All parts in the turbo are new (seals, bearings so on.) It has never been on a car at all. So I think it sounds like it is a stock exhaust side and a T04 compressor. Is this a good turbo for the 2nd gen? Is the .60 A/R and 40 trim a good setup? My car has a full custom free flow exhaust, and a manual boost controller. All the fuel system is stock, as are the engine internals. What kind of power gains can I expect over my stock turbo? How big of a jump is this from the stock turbo? Would I need to port the wastegate if the exhaust side is stock? And lastly, how much do similar turbos usually sell for? What would be a good price on this? THANKS GUYS!!

Felix Wankel

First thing you need to look into before that turbo is some fuel mods. That TO4B will be putting out way too much air for your stock fuel system.

nathandarby67

Even if I run it at stock boost levels? That is what I had in mind for now anyway. What kind of mods would I need to do to the fuel system?

fc3s94509

you need a fuel cut defencer, fuel pump upgrade, and bigger secondary injectors at the least. [IMG]i4.yimg.com/4/d6ea6505/g/9e60ba90.jpg[/IMG]

Felix Wankel

Even at stock boost that compressor wheel will be moving more air than the stock one. Get a higher flowing fuel pump first (I have a Walboro) and possibly some larger secondary injectors.

nathandarby67

Thanks for the info guys....If I do the fuel system upgrades, do I need some means of controlling the fuel flow such as an Apexi S-AFC or something similar? Or will the stock ECU handle things?

A little more off topic here: I am not doubting your statement that I need more fuel, but I have always thought that the amount of air flowing through an engine is a function of the manifold pressure and the engine rpm's, and the benefit of a bigger turbo is that it can compress the intake tract to a given level at a lower temperature as a result of its greater thermal efficiency. i.e. the air coming out of a small turbo at 10 psi will be much hotter that the air coming out of a large one at 10 psi, but it will be the SAME AMOUNT of air. I mean, 10 psi is 10 psi, and a liter of displacement is a liter of displacement, no matter what kind of compressor the air is flowing through. I have seen this argument go back and forth over on the MR2 bulletin board before as well. I guess as an engineer I am always wanting to know exactly why things are doing what they are doing! Guess I will always have a little nerd in me!

HWO

the exhuast side is too small for a 13B, you need a 0.96 or larger, the compressor would be OK, but not GREAT, it'd possibly make 350HP possibly 400 - the compressor, but the exhuast side is too small.

10psi is 10psi but, with a larger turbo you are getting 10psi of fresh air, with a small turbo you are getting 3 or 4 psi of exhuast pressure left over and only 6-7psi of fresh air. because of this the engine chokes and therefore doesn't make the same power, it is all about how much CFM the whatever psi works out to be, a small turbo can be pnly blowing half the CFM of a large T04 while both are at say 15psi, which is why, 15psi with a stock turbo will only make around 250hp, while with a T04 you can make near 500HP