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Old 09-13-2010, 08:46 AM   #1
dasleepa02
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Default top lbs on sti turbo

hey im new to the game , i have a bugeye with a hybrid setup and some upgrades, ( pistons , fuel , injectors ect) my question is I have a sti turbo and whould like to know how much lbs can it hold with my setup without going wrong? i have a mbc and have it at 21 now.
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Last edited by dasleepa02; 09-13-2010 at 08:57 AM.
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Old 09-13-2010, 08:55 AM   #2
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35psi papa.
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Old 09-13-2010, 08:58 AM   #3
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35psi papa.
really???
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Old 09-13-2010, 09:55 AM   #4
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Sti turbos lose efficiency quickly after 20psi, by 25psi your blowing very hot air and not gaining much from the added boost. If you want more power your going to have think about upgrading to a larger turbo

ps. dont crank up the boost with a proper tune!
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Old 09-13-2010, 01:20 PM   #5
wrxwhat
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really???
no, Lol
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Old 09-13-2010, 06:35 PM   #6
dasleepa02
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no, Lol
thanks for the great info! ass....
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Old 09-13-2010, 07:02 PM   #7
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Quote:
Originally Posted by wrxwhat View Post
35psi papa.
Quote:
Originally Posted by dasleepa02 View Post
really???
Sure, if you want too.
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Old 09-13-2010, 07:16 PM   #8
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Quote:
Originally Posted by dasleepa02 View Post
hey im new to the game , i have a bugeye with a hybrid setup and some upgrades, ( pistons , fuel , injectors ect) my question is I have a sti turbo and whould like to know how much lbs can it hold with my setup without going wrong? i have a mbc and have it at 21 now.
Have you done anything to combat the compression issue ie combustion chamber shaping, low compression pistons, thicker headgasket [cringe]?

If not, you are prone to knock, especially with higher boost. I could only get about 17 lbs of 'safe' boost and minimal timing. Eventually my motor cracked a ringland... Just some food for thought.
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Old 09-13-2010, 07:20 PM   #9
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^^^ this ^^^

I would honestly go get it checked out. It may not be safe as it sits. More boost is definitely a BAD decision on that setup.
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Old 09-13-2010, 07:45 PM   #10
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only the person who tunes your car can answer this question. you do have it tuned for 21 psi dont you...
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Old 09-13-2010, 08:10 PM   #11
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I have run up to 25psi on a VF39. From 20psi to 25psi I only get like 5whp but I gain a ton of torque.
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Old 09-13-2010, 08:14 PM   #12
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ps. dont crank up the boost with a proper tune!
really? so crank up the boost without a proper tune?
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Old 09-13-2010, 08:40 PM   #13
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Quote:
Originally Posted by paintbing View Post
Have you done anything to combat the compression issue ie combustion chamber shaping, low compression pistons, thicker headgasket [cringe]?

If not, you are prone to knock, especially with higher boost. I could only get about 17 lbs of 'safe' boost and minimal timing. Eventually my motor cracked a ringland... Just some food for thought.
i do have pistons and a tune. but the guy that had the car before had it tuned at 18lbs
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Old 09-13-2010, 09:09 PM   #14
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lol blew my vf39 at 17lbs on the dyno
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Old 09-13-2010, 09:30 PM   #15
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Originally Posted by dasleepa02 View Post
i do have pistons and a tune. but the guy that had the car before had it tuned at 18lbs
so you think its ok just to turn it up to 21
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Old 09-14-2010, 12:58 PM   #16
dasleepa02
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Originally Posted by AWDWRXLOVER View Post
so you think its ok just to turn it up to 21
i have no idea, i just wanted to get some more power. i should just get a big 16g?
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Old 09-14-2010, 02:15 PM   #17
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Not trying to be an a$$ - but first you should get a tuner.. You can't just go willy nilly turning up the boost.. Or slapping on a larger turbo.

First you need to figure out how this "hybrid" was built.. Then your tuner needs to actually tune the car for a higher level of boost.. Right now you have no idea if you are running out of fuel.. Running too much timing.. etc etc etc..


In the past few years Ive seen a few project cars that I've had my hands on blown up by stupid kids that bought them. It was explained to them that they CANNOT turn up the boost without proper understanding / tuning.. One time a kid went straight to a gas station (after buying the car), filled it up, cranked the boost controller all the way up (profec b) and popped the motor 1 block later. The other was a fully built 2.3 stroker 4g63 setup for single digits.. 18 grand in that motor alone.. Had a 16g in it for break-in and 660cc injectors.. Stupid kid who bought that car strapped a 35r on it without touching injectors or tune and popped the motor..

DON'T BE THAT GUY!!!



* Edit! This is what was in the motor that the second kid above blew... The motor was built pretty much as strong as you can build a 4g63.. And he popped it by slapping on a bigger turbo without a tune (and injectors..)..


Last edited by BenGSX; 09-14-2010 at 02:54 PM.
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Old 09-14-2010, 08:05 PM   #18
dasleepa02
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Quote:
Originally Posted by BenGSX View Post
Not trying to be an a$$ - but first you should get a tuner.. You can't just go willy nilly turning up the boost.. Or slapping on a larger turbo.

First you need to figure out how this "hybrid" was built.. Then your tuner needs to actually tune the car for a higher level of boost.. Right now you have no idea if you are running out of fuel.. Running too much timing.. etc etc etc..


In the past few years Ive seen a few project cars that I've had my hands on blown up by stupid kids that bought them. It was explained to them that they CANNOT turn up the boost without proper understanding / tuning.. One time a kid went straight to a gas station (after buying the car), filled it up, cranked the boost controller all the way up (profec b) and popped the motor 1 block later. The other was a fully built 2.3 stroker 4g63 setup for single digits.. 18 grand in that motor alone.. Had a 16g in it for break-in and 660cc injectors.. Stupid kid who bought that car strapped a 35r on it without touching injectors or tune and popped the motor..

DON'T BE THAT GUY!!!



* Edit! This is what was in the motor that the second kid above blew... The motor was built pretty much as strong as you can build a 4g63.. And he popped it by slapping on a bigger turbo without a tune (and injectors..)..


thanks for the info guy. like i said im new to suby. i had hondas before so things are a little different. well i guess ill have to call up mike
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Old 09-14-2010, 08:59 PM   #19
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I kept cranking my boost controller up at Etown till I just pulled off the WG tube completely and let the turbo go for all it was worth! It would hit 24psi and taper off big time at higher RPM.

People say you can't do that because it just blows hot air but I have a FMIC and the more PSI it made the faster I went. Wound up doing a 12.5@109 untuned but I also have a EJ207 so I wasn't worried about hurting things like a USDM engine.

Find out what your Hybrid is and then have it tuned but your tuner will be the one to set your standards I would say
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Old 09-15-2010, 01:40 AM   #20
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Quote:
Originally Posted by 2002WRXSTi View Post
I kept cranking my boost controller up at Etown till I just pulled off the WG tube completely and let the turbo go for all it was worth! It would hit 24psi and taper off big time at higher RPM.

People say you can't do that because it just blows hot air but I have a FMIC and the more PSI it made the faster I went. Wound up doing a 12.5@109 untuned but I also have a EJ207 so I wasn't worried about hurting things like a USDM engine.

Find out what your Hybrid is and then have it tuned but your tuner will be the one to set your standards I would say
*Cue 'Billy Madison' wrong answer speech*
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Old 09-15-2010, 03:06 AM   #21
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but I also have a EJ207 so I wasn't worried about hurting things like a USDM engine.
Idiot. Thanks for posting the wrong info.
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Old 09-15-2010, 11:57 AM   #22
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Quote:
Originally Posted by meccjoo View Post
really? so crank up the boost without a proper tune?
Correction: Don't crank up the boost without a proper tune.

OP: Take your time and figure out what your goals are for the car. More power is possible from the set up you have, but it is more involved then just turning up the boost. Start with a full mod list and realistic future HP goals and the knowledgeable people here will point you in the right direction
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Old 09-15-2010, 12:01 PM   #23
dasleepa02
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Quote:
Originally Posted by xsblack View Post
Correction: Don't crank up the boost without a proper tune.

OP: Take your time and figure out what your goals are for the car. More power is possible from the set up you have, but it is more involved then just turning up the boost. Start with a full mod list and realistic future HP goals and the knowledgeable people here will point you in the right direction
thanks man i appreciate the help.
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Old 09-15-2010, 12:21 PM   #24
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Originally Posted by juanmedina View Post
I have run up to 25psi on a VF39. From 20psi to 25psi I only get like 5whp but I gain a ton of torque.
this..

at 23psi i was at 285whp and 344wtq


over stock on the same dyno thats 65whp and 114wtq increase
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Old 09-15-2010, 04:48 PM   #25
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Check the last chart in this post (or any other "Stage 2" type setup in PPB). Ignore the actual HP / torque numbers, this is a dyno they use correction factors on. Just look at the boost curve, more specifically, boost pressure at peak power:

http://forums.nasioc.com/forums/show....php?t=2055539

Note that the boost at the power peak is like ~16 lbs. That's because it can't flow enough to run higher boost at peak power. Doesn't matter if you run 18, 20, 25 psi, your peak power will be at some lower boost pressure.

What you gain with more boost is a torque mountain, which is nice, but not worth popping your motor for.
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