Rtek 1.7
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Junior Member
Joined: Jul 2009
Posts: 26
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From: Costa Rica
Rtek 1.7
New owner with lots of questions lol.
So I'm about to buy the 1.7 Rtek upgrade for my S4, currently my oem injectors but I'm about to upgrade to 720cc secondaries. So my first question is how high can I boost safely with this ecu upgrade? I know the oem turbo is good for like 12psi. I'm not in the search of big numbers just a little bit higher cleaner power somewhere around 200rwhp or past that lol.
Also I have a ported westgate and S5 turbo trim, along with a full 3" exhaust from the turbo to the Y pipe then it goes to individuals 2,5. ( soon to be single 3"). But I noticed my oxygen sensor it's disconnected....will I need that with my set up?
And one last question if I make my primaries work as secondaries (if that it's even possible) and the 720's as secondaries how much boost could I runwith out blowing my engine?
Note: my engine is old and I know it's going to blow soon but I wanna have fun doing it. Then rebuild, have fun ,blow, then do it all over again!!
So I'm about to buy the 1.7 Rtek upgrade for my S4, currently my oem injectors but I'm about to upgrade to 720cc secondaries. So my first question is how high can I boost safely with this ecu upgrade? I know the oem turbo is good for like 12psi. I'm not in the search of big numbers just a little bit higher cleaner power somewhere around 200rwhp or past that lol.
Also I have a ported westgate and S5 turbo trim, along with a full 3" exhaust from the turbo to the Y pipe then it goes to individuals 2,5. ( soon to be single 3"). But I noticed my oxygen sensor it's disconnected....will I need that with my set up?
And one last question if I make my primaries work as secondaries (if that it's even possible) and the 720's as secondaries how much boost could I runwith out blowing my engine?
Note: my engine is old and I know it's going to blow soon but I wanna have fun doing it. Then rebuild, have fun ,blow, then do it all over again!!
Joined: Feb 2001
Posts: 29,798
Likes: 128
From: London, Ontario, Canada
200HP will be easy. You'll see that power around 9-10 PSI.
I'm not sure what you are asking about "making the primaries work as secondaries". You'll leave the 550CC primaries in place, and upgrade the secondaries to the 720CC units when using the RTek.
Yes, you should reconnect the oxygen sensor. This will allow the car to go into closed loop at light load and improve mileage a bit, as well as emissions.
I'm not sure what you are asking about "making the primaries work as secondaries". You'll leave the 550CC primaries in place, and upgrade the secondaries to the 720CC units when using the RTek.
Yes, you should reconnect the oxygen sensor. This will allow the car to go into closed loop at light load and improve mileage a bit, as well as emissions.
Thread Starter
Junior Member
Joined: Jul 2009
Posts: 26
Likes: 0
From: Costa Rica
1st. What's the amount of boost I can run. With 720 as secondaries??? With out having to worry about running lean.....using the Rtek 1.7
2. Making 720 as secondaries and 550 as primaries how much boost can I make using the Rtek 1.7?? Before I have to upgradeto a full stand alone ecu???
I'm sorry I didnt phrase it clearer before
2. Making 720 as secondaries and 550 as primaries how much boost can I make using the Rtek 1.7?? Before I have to upgradeto a full stand alone ecu???
I'm sorry I didnt phrase it clearer before
You can push the limit of the stock turbo with 550cc primaries and 720cc secondaries, which is roughly 12 psi. The maximum injector duty cycle I have seen doing exactly that is 72% at about 11.5:1 AFR. In other words, all 4 injectors were operating at 72% d/c. It isn't just the secondaries that are used at high RPMs; but rather all 4 injectors.
Keep in mind however that the stock turbo won't be able maintain 12 psi for long. It will only make that pressure in about the 3500 - 5000 RPM range. Peak horsepower is going to be calculated around 6000 - 6500 RPM, where you might only be making 6 - 9 psi. Raising the boost up on the stock turbo primarily provides lots of mid-range torque.
Keep in mind however that the stock turbo won't be able maintain 12 psi for long. It will only make that pressure in about the 3500 - 5000 RPM range. Peak horsepower is going to be calculated around 6000 - 6500 RPM, where you might only be making 6 - 9 psi. Raising the boost up on the stock turbo primarily provides lots of mid-range torque.
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