45 replies to this topic

[Twincharged&Auto]

 dnm, on 22 March 2012 - 05:00 PM, said:

 Twincharged&Auto, on 22 March 2012 - 08:08 AM, said:

And there's also nothing wrong with boosting a 2zz but stating X psi is a safe amount is only half the story. I would limit it by HP and not boost, you can run several different sized turbos and there will be a safe psi amount differing for each one.

I don't understand this from a physics point of view.

The volume of air going into the motor is X. The only way you can change X is to change the pressure at which it enters the motor. The size of the turbo itself isn't particularly relevant at this point. Your 2zz with 8psi of boost going into it is going to make Yhp. Regardless of whether that boost is coming from a GT28 or a GT40.

That couldn't be further from the truth.. A gt25 at 8 psi may flow 300cfm of air and a gt40 will flow 400cfm of air (hypothetical values, not going to look it up but you get the idea here). The amount of air flow is what makes the power. A motor is a air pump, more air and fuel = more power. That's why for example, my subaru with the stock turbo at 22psi makes 220-230awhp and then with the 20g at the same psi it made 343whp! Same amount of boost and 100 more whp.

Edit: The pressure and compressor map are there to show you the amount of airflow that will be output and also to show you the limits of the turbo you are chosing.






This isnt really a great example since the gt25 or gt28 cant even operate at this range as you can tell from the map. Either a GT25 or GT28 on a 2l engine will choke out before any amount of boost at 7k rpm, and the gt40 would shine if revving to 8k+ rpm, but just to show you the difference I did it quick anyway. But the example here is using 22psi on either turbo and the figures I have for a 2l motor at 3k and 7k rpm to show the usable area on the map.

Edited by Twincharged&Auto, 26 March 2012 - 08:53 AM.

[dnm]

Fair enough, and I'm happy to be wrong. I am a lot.

[CORZRYDE]

 dnm, on 27 March 2012 - 02:18 PM, said:

Fair enough, and I'm happy to be wrong. I am a lot.

^ Yup, marriage will do that...

[keithvibe]

see siggy

[rakhino253]

I want turbo.. id even be happy with just 6-8psi lol

[keithvibe]

then buy my parts and you are well on your way ^^^

[CORZRYDE]

 keithvibe, on 27 March 2012 - 07:15 PM, said:

see siggy

^ Me thinks Justin won't live that comment down...

[snowboarder202]

 CORZRYDE, on 28 March 2012 - 08:19 AM, said:

 keithvibe, on 27 March 2012 - 07:15 PM, said:

see siggy

^ Me thinks Justin won't live that comment down...

I agree lol, it's going to take another douchbag comment to redeem himself

[dnm]

There's not really much to live down; when you're married, you get used to being wrong.

All. The. Time.

[CORZRYDE]

 dnm, on 28 March 2012 - 02:40 PM, said:

There's not really much to live down; when you're married, you get used to being wrong.

All. The. Time.

^ This should be my sig...

[Twincharged&Auto]

You can either be Right or be happy, you can't have both

[Salsa Guy]

^^^LOL Spoken like a HAPPILY married man

Edited by Salsa Guy, 29 March 2012 - 08:53 AM.

[TurboKits.com]

You must be married! LOL

 Twincharged&Auto, on 29 March 2012 - 08:34 AM, said:

You can either be Right or be happy, you can't have both

[CORZRYDE]

 Twincharged&Auto, on 29 March 2012 - 08:34 AM, said:

You can either be Right or be happy, you can't have both

^ Yup! So I guess it's true when they say, ignorance is bliss!

[trixi_gmr]

 Evilthorne, on 22 March 2012 - 06:07 AM, said:

I drove over three years making 11psi before I ran into an issue caused by my own experiments. The 2zz loves boost, and if I got another one, which I would love to do, I would not hesitate to boost it again.
The big secret is engine management. I think good advice is to stay away from the AEM FIC. buy a hydra EMS or even apexi PFC, the other option is if you have a manual DBC you can run the spoof.

wait are you talking with completely stock internals???

[CORZRYDE]

^ If my memory is correct, then yes that was on his stock internals. Afterwards, he built the motor up...(big time!)

[trixi_gmr]

^ oh ok because ive always wanted to boost but have stayed away from it because i have always been told not to boost high compression vehicles

[CORZRYDE]

 trixi_gmr, on 09 April 2012 - 09:39 PM, said:

^ oh ok because ive always wanted to boost but have stayed away from it because i have always been told not to boost high compression vehicles

^ It's a half truth. What's correct is you should be more careful boosting a high compression vehicle. With a higher compression ratio, you stand the chance of grenading the motor if you try to add too much psi or you don't tune properly. This can occur on any engine no matter what the ratio, it's just higher compression engines are more sensitive to it.

I'd suggest having a pro assist in the project and getting advice from the 2zz guys here that have boosted before to see what they did, what worked, & what to avoid.

Happy modding!

[trixi_gmr]

oh ok i have dealt with boost before but that was with an sti and with there closed deck blocks its hard to hurt them..........but i defiantly think if i do eventually decide to boost im going to rebuild the motor any ways.....because i have to be able to keep up with the sti haha

[CORZRYDE]

^ Then you definetley need to talk to Evilthorne, his built 2zz SC would smoke STI's.