4efte maximum boost level with a ct9

[Charith]

A bar of boost on a CT9 is fairly on the money in terms of peak efficiency, any higher the unit will get outside it's comfort zone but I've seen them run.

There's a few things you need to upgrade to maintain it's lifespan and reduce the chances of engine failure.

Think of the engine as a big air pump that mixes fuel into the air then ignites it at the right time to make power.

First and foremost you need to understand that adding more air to the mixture requires you to add more fuel. If you add too much air without the required amount of fuel you will create a lean mixture. This is very bad for the engine as a lean mixture creates a fast, unpredictable explosion which can go off too soon and hit the piston on the way up. Think of throwing a cup of fuel onto an open fire - big flash and instant reaction.

So before we add too much boost you need to have the fuel to support it and maintain a good, safe mixture.

Worth mentioning at this point that adding too much fuel can offer problems too. Say your mixture is at the opposite end and is too rich. The explosion is now slower and nowhere near as powerful. Think of throwing a full bucket of fuel onto an open fire - it dampens down first then burns once it's settled down with little flash.

The mixture is key. Too rich and you lose power or experience borewash (you can google that bit). Too lean and you start melting pistons and exploding rings with detonation/knock. So it's important you understand this before taking away the factory safety net of fuel-cut. I've seen a lot of folks fit a FCD, turn up the boost then suffer engine failure without realizing why. Some of them proceed to blow up another one or two engines before catching on.

Hey jay hope you got my pm

 

[Charith]

sounds like you have pretty decent advice from the members
i'd prefer you get a piggyback (EMU or EMB) than a plug and play ecu (blitz, jam, Sard, etc)...the piggyback can be tuned specific to your set up, plus you have an automatic which may be a little more difficult to get an aftermarket plug and play ecu anyways

you will need the above supporting mods the others have told you about for engine safety----i must say i'd prefer you get a FMIC as well if wanting to run approximately 14 psi as i'm not a fan of tmic (even though you have the rx7 unit).
given your stock engine, and what you have said, i'd probably run anywhere between 10 psi - 14 psi depending on how the turbo/engine reacts and how tune goes
whatever you do, do NOT turn up the boost without the supporting mods
decat?, exhaust system? uprated fuel pump (you don't know the age/health of the existing one)? fmic?, aftermarket exhaust manifold? piggyback/pnp/standalone? etc

also, how has your transmission been maintained?---oil changes? does it carry a filter and does that need changing?....i'm not sure, but may be Jay and the others can help, will he need to think about a transmission cooler?

Hey there thanks a lot for the reply means a lot
Well i recently changed my exhaust system to 2.5” straight up and yea aftermarket down pipe and manifold. Fuel pump i do need to change. With the current setup car is making 12 psi. Just thinking wether it’s ok to turn up boost to around 1bar after fixing a fcd,petrol pump, fpr and a boost controller

 

[gorganl2000]

i'd avoid that fpr/fcd combination--it's an old fashioned and crude way of doing it (yes, it may "work" but you don't get the best out of the car)
get the piggyback and a tune at least, you will be probably happier in the long run

 

[Charith]

One of my friends have offered an ecu called ultra tech. Have you heard of it?.

 

[SKINY]

http://www.ultratech-electronics.com/pro-ems.html

Someone with more knowledge can explain that one bud