6G Celicas Forums

Hi, I am sure this has been answered somewhere, but I need help on what to do and expect on raising boost to 17psi.

From my understanding, the stock computer/turbo/internals can handle up to 17-17.5psi.

Now, I was looking at buying an AEM Boost Controller, a Turbo Smart Fuel Cut Defender and put in a Down Pipe (I already have a 3" CAT Back Exhaust and an Intake).

So:
1. Will I need anything else?
2. What kind of Power Increase can I expect?
3. Will the car remain Reliable?

Kindly let me know. Thanks.

1. not that i can think of
2. 330-350
3. yes

Phew! I thought it was gonna become unreliable!

And that much HP Increase?

i suggest forget the boost cut defender, just get a good boost controller and find the perfect duty cycle thats 1 or 2% shy of boost cut.

I think the Fuel Cut Defender is more of a piece of mind for me more than anything else.

Reliability and Power output is what I'm actually concerned about (specifically reliability).

Can you confirm the power output that I can expect?

a 3rd gen 3sgte with bolt ons (3" downpipe, intake, boost controller) at stock max boost 17-18psi will put down 300+/- hp, fact.

the factory fuel cut is a peace of mind as its protecting your motor from damage in high boost levels past stock max. usually people install a water/meth kit if they plan on running more then 17psi of boost to help protect the motor. it will help keep the motor cooler and safer under high boost levels and give it a boost in hp with the meth mixture.

This post has been edited by Ted95: Jan 17, 2013 - 3:10 PM

Thanks a lot for the help fellas.

I will be going ahead and purchasing the parts and having them installed.

Once finished, I'll post back here and let you know the update.

Thanks again.

For 17psi (1.1bar) you wont need anything. 17.4psi or there abouts is the standard fuel cut. As long as the car is mechanically sound you will be fine although you may occasionally hit fuel cut in certain conditions

Fuel cut defenders are best avoided. All they do is **** with your car...those things are deadly. I wouldnt fit one if you payed me.

If that is your only mod (other than the ones you mention) I recon you'll be lucky to make 300BHP at best if your car is in perfect working order.

Ok, thanks Nial, I'll keep that in mind.

And 300BHP sounds more realistic to me as well, maybe even just 280BHP.

i drove a 6th gen with a 3S swap in it at 18 lbs it felt stronger than my 7th gen did making 350. the 6th gen is heavier so that tells me its in the ballpark of 350.

Well sense where on the topic of boost and hp. Ill be getting my car finished this up coming week super excited! !
I have st205 3s swap with 3in dp 3in full exhaust electronic boost controller ect...... my ? Is I will be running 15psi what hp levels will I be looking at with 91 octane? Or possibly 100 octane? Thanks!

meh 270hp give or take

This post has been edited by Ted95: Jan 18, 2013 - 12:18 AM

What? Your worried about reliability yet wanna install a Fuel Cut Defender? That's stupid because the FCD will actually allow you to run higher than normal boost so with a boost controller set at 17 you will run the risk of going over that and there goes the reliability.

And you'll want to disable the TVSV to allow you to run full boost in 1st and 2nd gear.

Also while it is said 3s' can handle upto 17psi stock, your chances of engine failure are still higher as it puts more pressure on all other engine components.

st205 barely make 240hp at the wheels on standard with overboost

mine does 235 on the wheels, with boost slightly more.

what EBC works well with the GT4 ? simple, functional and easy to use?

Im Currently running HKS intake, Berk Downpipe, Kakimoto Exhaust, and Hallman Boost Controller on my ST-205 Pushing 15-16 psi with no fuel cut defender, runs flawlessly. Didnt want to run it at 17psi just incase it spikes.... :-)

This post has been edited by 83841: Jan 24, 2013 - 5:12 PM

From 2009 I try to find out how to squize some more HP from ST205 3SGTE. I have spend many hours on dyno... I saw what is possible, what is not. Where are the limits. Believe me what Nial wrote below is bloody true



Plus... just do not underestimate one "small" thing. It is called "Octane rating" of the fuel you use. According to wikipedia has "regular" fuel in the US rate 87(AKI) that is 91RON... ST205 has ECU mapped for 95RON. That is in AKI 90–91. So in the USA when you take 90-91 you can expect those 245-250HP with stock boost. When you push the car to 17psi be sure you hit the limit of the 90-91AKI fuel first and you barely reach 300HP. Probably just those 280 already mentioned.

To get higher you need to put inside 93–94AKI fuel OR cool down the mixture. So really do not underestimate octane rating of the fuel you use.

note: is it true you CAN NOT buy 93-94AKI fuel in California? If so... how is got damn possible you have 350HP on the engine with that low quality fuel and not destroy the engine???

hmm maybe thats why my car dyno'd with higher power on stock setup ? I live in The Netherlands and use RON98. (JDM ST205)

This post has been edited by UndaGrwnD: Jan 25, 2013 - 4:29 AM

I dynoed 298 at 17.6 psi using 93 octane fuel.

93AKI? That is pretty reasonable power for that boost. Thanks for sharing.