Ive done all the searches on this but really wanted to talk to those who have done it. Whats a good size turbo to be safe on my motor? Do I need to lower the compression? How much power can be expected from 6 or 7 psi What are the basic rules on a b18c5 I hear way to may conflicting things from people.

 

If you boost it stock at 8 pounds you should be right around 280 whp. Seen many setups running strong after years. The turbo I would recommend would be a GT30R or a GT28RS . Keep in mind you will have almost no lag time and prepare to spin your *** off with a high compression motor. I was in the same boat as you. Did alot of thinking on setups etc. Remember, its all in the tuning.

PS: Your better off posting in the forced induction forum, because people are gonna give you a hard time in here

 

ZOMG TURBOING AN ITR!?!?!?
GASP!
ITR IS KING DO NOT WASTE BY TURBO!!!

im kidding around but doostur is right, high comp/8lbs. prepare to GRIN your *** off ^____^
my only suggestion would be if you have the ORIGINAL BLOCK from your itr. in your itr.... please dont turbo it, because it is true that you are more likely to crack a wall or damage the block beyond repair in some way with turbo over NA. and it would be a shame to loose your OG block... id suggest buying a JDM GSR block or a used ITR block or something, i know a guy with a pretty quick turbo NHBP and he actually put in a GSR block to boost away on. kept his ITR safe and sound.

 

If you dont cut any corners and do it right the first time you should have no problems. Anything over 8 pounds and your entering the Top Gun Danger Zone!

 

doostuR talking about psi means nothing.

To the op just get a turbo that is right for your power goals and push as many psi needed to reach it. If u plan on keeping the stock engine and have a very nice powerband definetly get the gt28rs. Other than this the basics, clutch, bigger injectors, fuel pump, arp headstuds etc.

And do not cheap out on the tune!

P.S- i personaly went with a thicker hg just for the peace of mind and havent had any issues for almost 2 years, now i have a built ls/vtec in its place and gonna put the old R motor on a civic eg just for trackdays (once i have the funds )

 

^ Nope - Nada - Zilch.

New to boost - no. New to boost with the C5 - yes. Learning via first hand experience - you bet.

Step aside folks... RedR knows all.

 

did i hurt your feelings doostur?

I never said i knew it all but your statement of over 8 psi is going into the danger zone its the same as you saying a t2 at 8 psi produces the same power as gt40 at 8 psi, thats all.

 

So your saying that you would take a stock c5 over 8 psi? Say with a GT28s...

 

lol and u keep talking about psi. What about the ex manifold, im, dp/exhaust size doesnt that count doostur? All that (and more) comes in place when u r trying to reach your goals.
I have a FR stage 1 kit with a t3/t04 60 trim .63 a/r and with the stock engine it was doing 10 psi.
And yes on a gt28s (u probably wanted to say rs) i would push it to reach my goals and that compared to a gt28rs with certainly have to be more.
Check a few setups on evans-tuning.

 

check the post some guy put up about blowing his up on 4 pounds.

 

my buddy ran a stock full race kit with a gt30r tuned on 8pounds on his c5 and never had a problem with it for the year he had it, jeff evans tune

 

Boost is addicting like crack so i would probably do a 35r. I think its all luck, sometimes the motor holds up and sometimes the ringlands fall apart. I ran 300whp for about 5kmiles and then the ringlands went when i was racing a z06 on the highway...Sounded like a subaru after that...This was on a really clean and conservative tune.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Greg456 &raquo;</TD></TR><TR><TD CLASS="quote">then the ringlands went when i was racing a z06 on the highway...Sounded like a subaru after that...This was on a really clean and conservative tune.</TD></TR></TABLE>



PSI is irrelevant to power. PSI and power depend on turbo size. 10psi on a small turbo will not make the same power as 10psi on a large turbo. If I am wrong someone please correct me.

All in all I think most would agree that it is not safe to push your stock motor over 280whp. So whether thats 5-10 psi, don't push your motor farther than it can go. In general, I think doostur is trying to say don't go past 8 psi, because 8 psi on most turbos will grant you the maximum power you should run to be safe.

 

8psi is still 8psi...Think about it (As long as the air has the same temp)..

If you force 8 pounds of air into the intake pipes...There will still be the exact same amount of air (volume) inside the charge pipes/ intake manifold.

When the turbocharger gets out of its efficieny range then the the air flow drops.

Heres some equations that might make more sense:

volume of air (cu ft/min)= (engine rpm x engine cid)/(1728 x 2)

actual air flow = ideal air flow x volumetric efficiency




Modified by citrus3000psi at 1:59 PM 10/29/2007

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by citrus3000psi &raquo;</TD></TR><TR><TD CLASS="quote">8psi is still 8psi...Think about it..

If you force 8 pounds of air into the intake pipes...There will still be the exact same amount of air (volume) inside the charge pipes/ intake manifold.

When the turbocharger gets out of its efficieny range then the the air flow drops.

Heres some equations that might make more sense:

volume of air (cu ft/min)= (engine rpm x engine cid)/(1728 x 2)

actual air flow = ideal air flow x volumetric efficiency

</TD></TR></TABLE>

very true...I was just going off what I've been reading on here. What you are saying makes perfect sense. Thanks

 

[QUOTE=citrus3000psi]8psi is still 8psi...Think about it (As long as the air has the same temp)..

If you force 8 pounds of air into the intake pipes...There will still be the exact same amount of air (volume) inside the charge pipes/ intake manifold.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by citrus3000psi &raquo;</TD></TR><TR><TD CLASS="quote">8psi is still 8psi...Think about it (As long as the air has the same temp)..

If you force 8 pounds of air into the intake pipes...There will still be the exact same amount of air (volume) inside the charge pipes/ intake manifold. </TD></TR></TABLE>

 

in to see who sorts out the misinformation...

 

exactly 8 psi is still 8 psi but a gt28 wont produce the same amount of power as a gt40 will at the same pressure level with this being said psi doesnt matter to decide on the "power goals" which is what we r talking about

 

I've been boosting on my stock block for about 35kmiles. Its up to 80k now. She still runs strong.
The rings are wearing out faster and you can tell it's lost power over the years, but in good shape still. I've been alternating between 8-11pounds depending how I want to drive that day.
But, since you are not new to turbos, then you know its all in the tune.

 

red r is correct I believe on this guys. 8 psi on a huge turbo isn't going to give you the same power as on a small turbo

 

I'm not talking about what kind of power its going to give you. I'm talking about the reliability factor at 8 PSI or more on a stock C5!

 

I say do it man! Turbo&gt;NA

 

Its obvious there is going to be different characteristics with different turbos aka different power etc. if not we would all be rolling around with the same turbo.

 

stay single digit boost, don't lower the compression, get a good tuner