I run 93 octane gas. How much boost can I run on that before I have to use race gas?

Is there a way to tell or is it just over a certain boost level?

Sleeved gsr
9:5:1 scat rods/ross pistons
Gsr head skunk2 daul valve springs & retainers
stock valves
Ctr cams victor x manifold.

 

There is a thread floating around here about highest pump gas numbers i think...seems to be that 450-500 is about the norm for maxing out 93 octane

 

Is the octane number I run based whp or the amount of boost I'm running?

Or would the wideband readings indicate when I need to change over to race gas?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by VtecnTurbo &raquo;</TD></TR><TR><TD CLASS="quote">Is the octane number I run based whp or the amount of boost I'm running?

Or would the wideband readings indicate when I need to change over to race gas?</TD></TR></TABLE>

How much power you looking to throw down??? I put 400whp down with a STOCK GSR last year and it ran fine for a long time then I built the bottom end and them it was time to run 110 pump(up here in Boise ID) and then at races I ran a mixture of 110 and 116 so it was approx. 112ish give or take a few but that was well over the 550whp mark. I was running the t3/t67h.o. just for reference.

Anyways, race gas is GOOD...anyday! But pump is good for anything under 500whp I would think!

 

You have to get re-tuned if you use race gas as power will drop at the same boost level. Generally speaking you don't want to go over 300 wtrq with 93 pump gas. I myself am doing more, but I wouldn't suggest it to anyone. You can use a meth/alchy injection to resist detonation and go for more power.

How much boost is always irrelevant. But with a smaller turbo and lots of boost you will most likely generate heat and P*V=n*R*T so heat is never good

 

I'm looking for mid 400. My car is normally street tuned. So far as when to switch to race gas with out a dyno had me a lil confused.
Do I get it tuned with low boost on pump gas and high boost using race gas?

Do I tune with race gas and then turn down the boost while on the street with pump gas and then up the boost when I use race gas since its tuned?

How do I determine when to use race gas instead of the pump gas??

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by VtecnTurbo &raquo;</TD></TR><TR><TD CLASS="quote">I'm looking for mid 400. My car is normally street tuned. So far as when to switch to race gas with out a dyno had me a lil confused.
Do I get it tuned with low boost on pump gas and high boost using race gas?

Do I tune with race gas and then turn down the boost while on the street with pump gas and then up the boost when I use race gas since its tuned?

How do I determine when to use race gas instead of the pump gas?? </TD></TR></TABLE>

Race gas burns slower then pump gas so timing needs to be advanced...usually by quite a bit too. the tuner will decide when to switch to race gas. If the setup is efficient and high revving (lower torque) then mid 400's may be possible. That's up to yor tuner to decide.

the way I do it is have a pump gas tune then either drain out the pump gas or add a lot of race gas to very little pump gas left. Run the car around a bit to make sure all the fuel is race gas then tune with race gas (just add timing). You have 2 options either use 2 chips or use a chip that has 512kb on it so you can run 2 maps on one chip with a ground switch to switch between either maps. It's not about high boost or low boost it's the gas you use that changes what map you need. IF you don't understand then just go to your tuner and tell him the numbers you want to make....he'll/she'll make the decision.