turbo SI psi question
06-22-2005, 01:57 PM
#1
Thread Starter
Join Date: Oct 2004
Location: horseheads, ny, united states
Posts: 111
Likes: 0
Received 0 Likes
on
0 Posts
turbo SI psi question
okay, i have a revhard turbo kit in my 02 si. i will be running around 20 or more psi after i get my other engine back that i sent out to be built. but in the mean time i want to run mopre than 7 psi. i know boosting to 10psi is possible with what i have done now to my car, but i was wondering.....how about 12psi? is that a safe boost? the k20a3 block is pretty resiliant with good compression ratios. i know someone who boosted to 14 and blew his engine. so i figure keep it below 14psi for now.....should i go 10 or 12?
06-22-2005, 02:10 PM
#2
Mr. Badwrench
Join Date: May 2002
Location: stranger in a strange land
Posts: 14,146
Likes: 0
Received 2 Likes
on
2 Posts
Re: turbo SI psi question (nos4a2si)
i.m.h.o. wait.
the extra pound or 2 isnt worth nuking an engine. wait till the other bullet comes back from the shop. and go nuts.
the extra pound or 2 isnt worth nuking an engine. wait till the other bullet comes back from the shop. and go nuts.
06-22-2005, 04:06 PM
#4
Honda-Tech Member
Re: turbo SI psi question (jdmhonda)
A certain "PSI" doesn't blow things up. A power output limit or a tuning error is always the cause. The K20a3 OE shortblock is good to around 300whp w/ no upgrades(so I have heard). Compensate for the added boost in the tune, keep it conservative and I think you'll be OK.
Phil
Phil
06-22-2005, 07:10 PM
#5
Junior Member
Join Date: Dec 2003
Location: Chicago, IL
Posts: 274
Likes: 0
Received 0 Likes
on
0 Posts
Re: turbo SI psi question (jdmhonda)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jdmhonda »</TD></TR><TR><TD CLASS="quote">he blew it cause his **** leaned out</TD></TR></TABLE>
06-23-2005, 09:16 AM
#6
Thread Starter
Join Date: Oct 2004
Location: horseheads, ny, united states
Posts: 111
Likes: 0
Received 0 Likes
on
0 Posts
Re: turbo SI psi question (kameleon23)
so.....7psi to just 10psi would be fine? i wont go to 12 if i feel it can be dangerous.....so one more time....10psi fine for now right? i have the k-pro upgrade and can get the car tuned whenever i need to. wouldnt want it running lean!
06-23-2005, 09:26 AM
#7
Mr. Badwrench
Join Date: May 2002
Location: stranger in a strange land
Posts: 14,146
Likes: 0
Received 2 Likes
on
2 Posts
Re: turbo SI psi question (nos4a2si)
10 psi on an fmu with a 12:1 rise will shut the injectors causing a lean condition. i WOULD NOT GO OVER 8 psi.
40 psi static, +
10 psi boost x 12 psi fuel pressure =
160 psi fuel pressure.
the injectors wont open or will have a hard time opening if they do at all.
40 psi static, +
10 psi boost x 12 psi fuel pressure =
160 psi fuel pressure.
the injectors wont open or will have a hard time opening if they do at all.
Trending Topics
06-23-2005, 09:44 AM
#8
Member
Join Date: May 2004
Location: Nashville, TN, U.S.A
Posts: 2,992
Likes: 0
Received 0 Likes
on
0 Posts
Re: turbo SI psi question (nos4a2si)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jdmhonda »</TD></TR><TR><TD CLASS="quote">he blew it cause his **** leaned out</TD></TR></TABLE>
could have been too little timing or too much timing, or too much fuel causing pre-ignition, or too little fuel as you said, or overboosting, or etc etc etc.....not just LEAN
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nos4a2si »</TD></TR><TR><TD CLASS="quote">so.....7psi to just 10psi would be fine? i wont go to 12 if i feel it can be dangerous.....so one more time....10psi fine for now right? i have the k-pro upgrade and can get the car tuned whenever i need to. wouldnt want it running lean!</TD></TR></TABLE>
If you are on FMU don't boost past 7-8 IMO opinion as boostedcivicsir said his reasoning is correct. If you are on a system like Hondata or similar you can boost more, but you must be tuned for it. Basically talk to your tuner, because he will know what's goin on.
These PSI questions are poping up EVERYWHERE...someone should make a sticky fast (not just FAQ) or I'm goin to do a writeup and everyone can refer to that
could have been too little timing or too much timing, or too much fuel causing pre-ignition, or too little fuel as you said, or overboosting, or etc etc etc.....not just LEAN
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nos4a2si »</TD></TR><TR><TD CLASS="quote">so.....7psi to just 10psi would be fine? i wont go to 12 if i feel it can be dangerous.....so one more time....10psi fine for now right? i have the k-pro upgrade and can get the car tuned whenever i need to. wouldnt want it running lean!</TD></TR></TABLE>
If you are on FMU don't boost past 7-8 IMO opinion as boostedcivicsir said his reasoning is correct. If you are on a system like Hondata or similar you can boost more, but you must be tuned for it. Basically talk to your tuner, because he will know what's goin on.
These PSI questions are poping up EVERYWHERE...someone should make a sticky fast (not just FAQ) or I'm goin to do a writeup and everyone can refer to that
06-23-2005, 10:35 AM
#9
Member
Join Date: Jan 2005
Location: Join the DarkSide. Boosted I mean.
Posts: 1,116
Likes: 0
Received 0 Likes
on
0 Posts
Re: turbo SI psi question (adseguy)
^and it's cfm not psi that people should be thinking about...
say a 14b @ 15psi makes ##cfm and a T3 @ 7psi makes the same amount of ##cfm... I hope you guys undersatnd this...if not go and search...
say a 14b @ 15psi makes ##cfm and a T3 @ 7psi makes the same amount of ##cfm... I hope you guys undersatnd this...if not go and search...
06-23-2005, 10:40 AM
#10
Mr. Badwrench
Join Date: May 2002
Location: stranger in a strange land
Posts: 14,146
Likes: 0
Received 2 Likes
on
2 Posts
Re: turbo SI psi question (H-T)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by H-T »</TD></TR><TR><TD CLASS="quote">^and it's cfm not psi that people should be thinking about...
say a 14b @ 15psi makes ##cfm and a T3 @ 7psi makes the same amount of ##cfm... I hope you guys undersatnd this...if not go and search... </TD></TR></TABLE>
nice. i always assumed people knew that.
when i had the stock t3 on my buick, at 17 psi it felt the same as my te-32e @10 psi.
say a 14b @ 15psi makes ##cfm and a T3 @ 7psi makes the same amount of ##cfm... I hope you guys undersatnd this...if not go and search...
</TD></TR></TABLE>nice. i always assumed people knew that.
when i had the stock t3 on my buick, at 17 psi it felt the same as my te-32e @10 psi.
06-24-2005, 10:23 AM
#11
Thread Starter
Join Date: Oct 2004
Location: horseheads, ny, united states
Posts: 111
Likes: 0
Received 0 Likes
on
0 Posts
Re: turbo SI psi question (boostedcivicsir)
i pretty much understand...makes sense, although, not to sound like a noob, but whats cfm.....i have an idea, but not 100% on it.....i am running a t3/t4 setup right now....although revhard is coming out with a stage 2 for my car...the gtbb....ball bearing....but that has really nothing to do with what we are talking about....but, yeah, i might as well wait till i get my other engine back....just sucks, cause im sending it in augest and they said i wont get it back till end of september of mid october...i wish i wasnt so impatient! as soon as my ecu gets back im going to talk to a tuner to see what the cars capabilities as of now are. your info definetly may have saved my engine though!
Thread
Thread Starter
Forum
Replies
Last Post
jdjustme
Forced Induction
20
03-09-2007 01:05 PM
Which one will be more dangerous for stock internals? small turbo high psi / big turbo low psi? or h
elpiar
Forced Induction
4
08-04-2005 01:52 PM
