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NEXT GENeration!
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Discussion Starter #1
Okay, so I have a lot of bolt-ons right now on my car as most of you should know because i've been posting a lot recently. I'm planning on installing my CMD + boost conrtoler later on this year + tune. A local shop said that after everything has been installed my car will hit peak boost then continue to drop boost. Example if my peak is at 18psi, it will continue to drop untill redline? If so will a Wastegate benefit me to keep my psi high?? Any advice or help you have will be greatly appreciated. THANKS!!!
 

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If you want 18+ psi at redline you need a bigger turbo.
 

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3.5L TT but wrong body
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The factory turbo is too small to maintain high psi at redline. Any more than 16-17 is asking for trouble. Even 17 is a weee bit high. You can get a pretty flat torque curve if you shoot for a peak of 17 and taper to 16 at redline. With full bolt ons and a tune like that you should hit ~250whp and ~250wtq. Peaking at 20psi and tapering to 16psi should yield ~250whp and 300wtq, it just won't be a flat torque curve. IMO the big surge of torque is worth dealing with "boost drop".
 

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NEXT GENeration!
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Discussion Starter #4
Ok so since i have intake/tbe/intercooler/cmd/boost controler/ what psi would be best and you're saying to not buy the waste gate then so my psi could be dropped to about 16ish???
 

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3.5L TT but wrong body
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Why the boost controller? You'll have RPM based boost control using the CMD... Skip the wastegate actuator too. "Best" psi on my car seemed to be a peak of ~21psi and tapering to 15.X/16psi at redline when I had the stock turbo.
 

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Out Pissing Off cops!
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The factory turbo is too small to maintain high psi at redline. Any more than 16-17 is asking for trouble. Even 17 is a weee bit high. You can get a pretty flat torque curve if you shoot for a peak of 17 and taper to 16 at redline. With full bolt ons and a tune like that you should hit ~250whp and ~250wtq. Peaking at 20psi and tapering to 16psi should yield ~250whp and 300wtq, it just won't be a flat torque curve. IMO the big surge of torque is worth dealing with "boost drop".
^^This...+1
 

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Out Pissing Off cops!
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4,572 Posts
Why the boost controller? You'll have RPM based boost control using the CMD... Skip the wastegate actuator too. "Best" psi on my car seemed to be a peak of ~21psi and tapering to 15.X/16psi at redline when I had the stock turbo.
^^+1. Without a CMD or a reflash, you won't be able to hit any PSI past ~17psi without having the car go into limp mode after throwing a CEL.

Like CH said, a CMD will give you much more control over the boost on top of many other things..
 

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NEXT GENeration!
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Discussion Starter #8
Damn 21psi is high LOL, so i can control the boost level on the CMD right?? someone told me different, ok sounds good i'ma try to have this shop set up my car like you did. How did you like your car modded before you upped the turbo???
 

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yeah there is no need for a boost controller. CMD does everything except for ignition (for now). autotune on 20psi and you will drop to around 16psi at redline and have one fun car. At least for a stock turbo.
 

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Hey guys,
I have found this thread very helpful. However, i need a little bit more help with all this. As of right now, my car is very close to stock. All i have is the Forge Blow off, Megan Racing Downpipe and Injen Intercooler Piping. Its kinda pathetic and pontless to be looking at raising boost with how little i have done. Except in the next 2 weeks i am dropping a few grand into the gen. I will be putting the Injen Intake along with Injen catback and megan test pipe so the exhaust will be complete. Also i will be putting on most likely the AMS Intercooler (so i can use my injen intercooler piping still and not just eat the money i already spent). Also i will be doing coilovers. probably the Stance +Pro.

My questions are...
1- I know that getting the PowerAxle reflash module is a must. I probably will get that. But I looked up the instructions and i don't get how to upload the ecu. Can someone tell me fast what to do after i plug it in?
2- After doing these mods, Is the CMD a good purchase to raise my boost or what? What will be the next step to getting just a little more boost and kind of just finish her off. I want the car to be safe and reliable, so i am a little iffy on running 20psi. I just don't like how i will have all these mods done to my car that will only be running 14 pounds. That makes no sense to me. This leads to my last queston which is
3- I would prob. want it around 18psi? Really, what is recommended? with these mods and tuning to the ECU, what is a good boost level?

i apologize for stealing and changing this thread. Also i am sorry for asking so much, but i have one more request. Can you let me know about how your cars perform with what you have done as well as power and performance gains? And most importantly, if you could let me know about installation (How To and How Hard).

Thanks to you all!!!
 

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The factory turbo is too small to maintain high psi at redline. Any more than 16-17 is asking for trouble. Even 17 is a weee bit high. You can get a pretty flat torque curve if you shoot for a peak of 17 and taper to 16 at redline. With full bolt ons and a tune like that you should hit ~250whp and ~250wtq. Peaking at 20psi and tapering to 16psi should yield ~250whp and 300wtq, it just won't be a flat torque curve. IMO the big surge of torque is worth dealing with "boost drop".
Quick Question...

How would i go about making 20psi then drop to 16 redline? what do you buy to make that happen? kinda a stupid question, i know you need a boost controler but what kind and is there anything else?
 

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Sex Machine
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no boost controller! U need a CDM or a reflash. All ur answers are in this thread alone.
 
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