Hey guys did a search and people seem to think that over 12psi you should switch to some kind of race gas. I would like to see reasonable boost levels, like 1 bar. Is this possible?

I run @ 14.7 psi (1 bar) on 94 octane w/o any problems.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ekb18c &raquo;</TD></TR><TR><TD CLASS="quote">I run @ 14.7 psi (1 bar) on 94 octane w/o any problems.</TD></TR></TABLE>

What compression? I am running 9.8:1 JE's

i think its safer if you hit up a dyno and find out yourself....every engine is different

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DC2R714 &raquo;</TD></TR><TR><TD CLASS="quote">

What compression? I am running 9.8:1 JE's</TD></TR></TABLE>

10:1

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ekb18c &raquo;</TD></TR><TR><TD CLASS="quote">

10:1</TD></TR></TABLE>

Nice! Are your internals built?

This is not so much a facor of the boost level, but a factor of the total package. You have to take injector size, intercooling, fuel management, compression ratio, timing advance, and all kinds of other goodies into account.

Boost itself only becomes a limiting factor when you get to absurdy high levels, like over 30 psi.

With good intercooling and good tuning, you could run 20+ psi on your motor, assuming the injectors are big enough to maintain the required A/F ratio. However, keep in mind that just because you can sustain that A/F ratio, does not mean that all the other factors are alright.

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

Nice! Are your internals built?</TD></TR></TABLE>

Yes, they are! Pauter rods with Arias pistons.

That makes sense. I think I will be able to handle 1 bar fine. Tuning is the key, I was just curious to those who run more than 12psi on pump gas and have higher compressions like 9.5:1 - 10:1

As long as you're tuned properly, you should be okay with 1bar and 93-94 octane.

I tuned on today. 9:1 83mm gsr motor with hondata and precision sc61. 93 octane, made 426whp and 309wtq at 18psi, with absolutely no knock recorded. The trick is keeping the timing in check.

ya Tony thats gonn a be the hard part cause I have a higher compression. I dont want to have like no timing and loose power.

any numbers on pump gas with low compression as in 8:1?

i'm running 15 psi daily on 92-93 octane gas. usingHondata 3B, RC 550 p&h injectors/ 255lph walbro fp, B&M FPR set at 50 psi. stock sleeves w/ block guard/piston/rod. it's all about tuning

bump for reply on low comp.

it's a tradeoff, once you get close to the limit with pump gas, when you switch to race gas, at the same boost levels, you'll be able to increase timing advance, and make more power without changing boost levels.

What is the typical timing advance when running on pump gas?

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BodyKits NW &raquo;</TD></TR><TR><TD CLASS="quote">What is the typical timing advance when running on pump gas? </TD></TR></TABLE>

i think average pump gas tunes are around 18-20 degrees total timing at WOT give or take. correct me if different

Usually around 22 degrees total timing at 1bar on 93 octane. That is very conservative, 18-20 is super conservative.

Right now I am at about 29degrees with 91 octane 10.5 psi.

[QUOTE=kpt4321]This is not so much a facor of the boost level, but a factor of the total package. You have to take injector size, intercooling, fuel management, compression ratio, timing advance, and all kinds of other goodies into account.
QUOTE]

Well I answered my own question. I am running on 14.2psi with 93 octane and the cars runs good. I think anything over that the timing would just be too retarded and not make as much power.

whats your timing at now ? do you know .

total advance I believe is like 22 degrees.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DC2R714 &raquo;</TD></TR><TR><TD CLASS="quote">That makes sense. I think I will be able to handle 1 bar fine. Tuning is the key, I was just curious to those who run more than 12psi on pump gas and have higher compressions like 9.5:1 - 10:1</TD></TR></TABLE>

Gone as high as 17 psi from a PT67 on 94 octane, 9.5:1 comp (although I have coated pistons, valves, combustion chambers). I've been daily driving it at 10-12 psi because it's too much power to handle at higher boost levels without slicks.