Ok, just got my RX7 (87 Turbo 2). Since im not gonna drive it during winter (im in Canada.. enough said) im gonna do a few small mods. First off is intake / exhaust...

I have a question though, what should I do for intake?

Should I get a Air Filter and bigger intake housing? this is what im thinking of doing

Anyways, I just wanna know what some of you did, what you dont suggest doing, what works, what dosnt... blah blah blah..

Thanks alot

 

you should check out the archives, I believe there is a very good thread about how to mod a TurboII

but incase you don't/can't find it:

When you do an intake/exhaust combo, your boost WILL creep, resulting in a blown motor.
you need to port the wastegate (requires removing turbo) and you also need to increase the amount of fuel used.
taht means larger injectors, fuel pump, fuel pressure regulator, fuel controller (SAFC) and prbly a few other misc things I've missed

DO NOT rush your power mods, they aren't cheap and can end up costing you more than you bargained for

 

Hey man, nice too see you live close to me. Anyways... im gonna try to find it... where exactly is it? in FAQ? where are the ARCHIVES?

 

How do you port a wastegate? (explain plz)

 

Archive is right above the first thread (the FAQ).

wastegate porting for s4
http://fc3spro.com/TECH/HOWTO/TURBINEPORT/tport.html

 

Thanks alot everyone, nice to see nobody here gets annoyed by my newbish questions.

I read the faq and archives (thanks alot.. VERY USEFULL!) and now have put alot more thought into what my first mods will be.

Just a few questions for REFLUX though:

Do u speak from direct experience?
Why does the boost creep?
Why must I port the waste gate and then increase fuel?

Sorry for the inconvinience, im still learning (very.... VERY slowly! lol)

 

Do a search under my username and type in boost creep or porting wastegate. I have posted in several threads.

 

The boost creeps because - The wastegate is a device that controls boost. When the gate is full open it can not bleed any more exhaust thru the hole. So what is the result. The boost keeps on building. And there is very little you can do about that. So what does porting do? It makes that hole bigger. It allows more exhaust to pass through the hole. Not accross the turbine to make more boost.

Porting the wastegate and increaseing fuel. Okie, you are going to put the cart before the horse on this one. Ask your self what type of exhaust are you going to get? Are you going to get something that is a cat back system? Which would retain the stock exhaust from the cat forward. Are you going to get a FULL exhaust system that removes all the cats? Or are you going to still leave the main one?

These things need to be decided first. Before you figure on your fuel requirments to do this all safely.

James

 

So REFLUX, is what you saying is the wastegate can't handle the improved breathability, so it lets in more boost then it should, which is why you have to increase the amount of fuel?

I just dont understand how you could get boost creep from just intake and exhaust. and how does porting the wastegate help?

Thanks
(and sorry for the questions again)

 

No, it can't you might be overwhelming the wastegate.

Okie here is the deal. Did you read what I posted at all? Just wondering.

Lets say you do this. You open up your exhaust. Full system no cats. You have a wide open intake. You floor it on a very cold night. You look at your AFTERMARKET BOOST gauge ( You do have one? If not get one. That is step ONE) and notice the boost is at 10psi. Wow, then it goes to 15psi on the way to 20.

You cannot just throw fuel at that. That will not fix the problem. You would need to port the wastegate. Period. Maybe a boost controler would help the situation.

You do not want to take your turbo off? Do this. Leave the intake stock. And open up the exhaust. That would help keep the boost down to good levels.

Do not get me wrong. You can go buy the Racing Beat turbo back exhaust system. Then buy the FCD Fuel Cut Defensor and have fun with your 59 extra hp. It wiil feel great. You will love it. But it will not last. Your engine will blow. Why did it blow? Not enough fuel to meet the heat in the engine to prevent detonation.

Do not do that

What is a FCD? Your engine computer will normally cut fuel to the rear rotor at around 8psi ( Is that right) to prevent an overboost. The FCD does not allow the cut the fuel signal to be sent. Regardless of the real boost levels. It lies to the engine computer so you can produce more boost without a fuel cut.

James

 

If I may chime in a little with a question of my own:

My stock exaust is leaking (88 turbo II) and I was looking at the Bonez turboflow system.. which is from the stock exaust manafold back. Can I use this setup since it has the stock intake without causing this problem? Or is it still flowing too much out the back....?

If it means not having an intake put on it.. then I guess that would be fine... or id try and port the wastegate as you are sugesting.. but I have never done anything of the sort.

Thanks...

I don't mean to hijack the thread I hope my question helps explain things a little more in the process of what can be used and what can't...

 

Wow, thanks alot REFLUX. I understand now,

So what do you guys sugest I get if all I want is a ungraded Intake / exhaust?

Thanks

 

ok, well instead of porting the wastegate can I just buy a diff one?

What is the mesurments on the stock 87 Turbo 2 Wastegate?

A guy I know is selling this:

F.S: Tial 38mm wastegate.

It was only used for 700kms, it looks brand new. Has a 0.3 bar (4.35psi) spring in it. It's polished.


Should I get this? Is it bigger than my current one? Would this work?

I dont know!!!

 

Bump.... anyone?

 

Search newbish one......there is a search function for a reason. Not to be a ***** but I am sure this has been talked about many times before.

 

Replacing the stock internal wastegate with an aftermarket external one is quite a bit of work, and requires substantial modification of both the turbo and manifold.

The best way for someone relatively inexperienced to fix the wastegate is just to remove the turbo and take it to a turbo shop. For a modest fee they will replace the flap with a much larger one and port the wastegate out to suit the new flap. This should totally eliminate boost creep.