i have a 95 ls that im currently runing about 9 and a half pounds of boost and i was just wondering what the highest amount of boost that would be safe to run.

 

It all depends on your supporting mods...stock blocks can handle upwards of 300 horsies, I don't know how well reliably however.

 

i cracked a cylinder wall at 14psi stock everything

 

Ouch! Was it professionally tuned?

 

the important thing to remember here is that basing all of this of the pressure isn't going to really measure anything. You need to know the size of the turbo because 15psi on a 14b and a 15psi on a GT4088R are two completely different things....

 

^

he is VERY right.


but, just for the record, I ran 10 psi on an untuned stock b18b bottom end for over a year. Never had problems. (I put a VTEC head on it, and ran the same setup for a day, and cracked ring lands on all 4 cylinders. Take that as you will)

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by pvt_awol &raquo;</TD></TR><TR><TD CLASS="quote">^

he is VERY right.


but, just for the record, I ran 10 psi on an untuned stock b18b bottom end for over a year. Never had problems. (I put a VTEC head on it, and ran the same setup for a day, and cracked ring lands on all 4 cylinders. Take that as you will)</TD></TR></TABLE>

wait untuned? what where you running for the fuel?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by pvt_awol &raquo;</TD></TR><TR><TD CLASS="quote">but, just for the record, I ran 10 psi on an untuned stock b18b bottom end for over a year. Never had problems. (I put a VTEC head on it, and ran the same setup for a day, and cracked ring lands on all 4 cylinders. Take that as you will)</TD></TR></TABLE>

if you were to just throw a VTEC head on a nonVTEC block and not adjust for all the extra flow, of course you're going to crack all of your ringlands. As soon as you hit boost, there is more air in each cylinder, but the same amount of fuel as before....it ran lean and pop....not that hard to figure out

 

^^ maybe he was running on fmu or something?

i ran 9psi on my gsr for 9 months with an fmu. then i got tuned and now the kit is off. no problems with running with fmu for me. my motor is still as strong as before boosting.

as for the OP's question. i think 9psi will be ok. just have good fuel management.

 

I was running a straight up DRAG III kit. It came with a Vortech FMU.

One of the reasons the build blew up so quick with the VTEC head, the boost started spiking upwards of 14 psi, because of the better flowing head and VTEC. All it took was a couple of test runs after the install of the head, and BOOM!

lol


it's ok though, because I was needing an excuse to put in forged internals. Now the motor is fully built, and running a tune. Just for the record, the tune is the most important part of any build. Keep that in mind new guys thinking about turbo'ing!

 

how much would a good tunner charge to tune my car for 3 hours

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by civicfla2 &raquo;</TD></TR><TR><TD CLASS="quote">how much would a good tunner charge to tune my car for 3 hours</TD></TR></TABLE>

dont be set on an amount of hours.....it may take more or less depending on how long they take on tuning part throttle....my first tuning session cost me almost $400

 

for a stock b18b limit yourself to 250-300whp and you'll be fine with a good tune

 

If I had a T25 off an eclipse Id be completly fine running 2 bar all day long if that turbo could actually be efficient at those numbers , but it were something like a T67 than ummm yea i think id be afraid to run 6 psi

 

im not exactly sure what the trim my turbo is but i no its t3/t4 there is about a centmeter of clearance between the compressor and my tranny im runin hondata s200. im kinda new on here and i mainly joined to learn more about this kinda ****...

 

with a t3 turbonetics turbo 7lbs untuned i made 239whp...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by doood &raquo;</TD></TR><TR><TD CLASS="quote">you'll be fine with a good tune</TD></TR></TABLE>


That is so true.

Or end up like this:
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by srt42004n &raquo;</TD></TR><TR><TD CLASS="quote">
</TD></TR></TABLE>

 

well to be quite honest i bought my car how it is. its a percision turbo and they guy i purchased the car from said it was tuned and 9.7 and he told me it was puttin down about 235-240whp and 210tq

 

Well 7 psi for me is safe considering that I also have a stock sleeve and valve train.