Well the Supra has broken down! Plz Help!!!

[SupraTT/Iceland]

well what about 18 psi on pump gas? is that ok? the Gas that you can get here from pumps is 95 oct, 98 oct and Shell V-Power 99 octane

compared to America 99 octane here is like 95 octane in the Usa

I think you use PON(Pump Octane Number)
And we use RON(Research Octane Number)

So would it be ok to Use 93-94 octane(PON) at 18 psi ?

[pwpanas]

Originally Posted by SupraTT/Iceland

well what about 18 psi on pump gas? is that ok? the Gas that you can get here from pumps is 95 oct, 98 oct and Shell V-Power 99 octane

compared to America 99 octane here is like 95 octane in the Usa

I think you use PON(Pump Octane Number)
And we use RON(Research Octane Number)

So would it be ok to Use 93-94 octane(PON) at 18 psi ?

The short answer to your question is no. For more detail, read on:

Ime, both RON and PON are useless figures. The only number that matters when you're taking about preventing detonation in a turbocharged engine is MON.

According to these links (and others):
http://www.btinternet.com/~madmole/R...RONMONPON.html
http://www.zeltex.com/eval.html
...the MON of what's referred to as 'premium' '93 octane pump gas' in the US is approximately 88. Ime on 88 MON 'premium' "pump" gas, you can boost to about 14psi without the Mkiv Supra Turbo's oem (unmodified) ecu detecting knock and retarding timing. 15psi is boarderline; at 16psi knock is clearly detectable and timing retard starts to occur. Every time you boost over 16psi (without some form of effective octane suppliment, as listed in my previous post), you risk engine damage.

[SupraTT/Iceland]

Originally Posted by pwpanas

The short answer to your question is no. For more detail, read on:

Ime, both RON and PON are useless figures. The only number that matters when you're taking about preventing detonation in a turbocharged engine is MON.

According to these links (and others):
http://www.btinternet.com/~madmole/R...RONMONPON.html
http://www.zeltex.com/eval.html
...the MON of what's referred to as 'premium' '93 octane pump gas' in the US is approximately 88. Ime on 88 MON 'premium' "pump" gas, you can boost to about 14psi without the Mkiv Supra Turbo's oem (unmodified) ecu detecting knock and retarding timing. 15psi is boarderline; at 16psi knock is clearly detectable and timing retard starts to occur. Every time you boost over 16psi (without some form of effective octane suppliment, as listed in my previous post), you risk engine damage.

I?m trying to get a hold on one of the previous owner because I know now that there is a another ECU in the car it?s not Stock. Much more gas flow. But I don?t know what kind.
But one thing is weird this car has always been over 20 psi with no problems but maybe 26 psi was just to much. I?m trying to get more information about what exactly has been done.

[pwpanas]

Originally Posted by SupraTT/Iceland

I?m trying to get a hold on one of the previous owner because I know now that there is a another ECU in the car it?s not Stock. Much more gas flow. But I don?t know what kind.
But one thing is weird this car has always been over 20 psi with no problems but maybe 26 psi was just to much. I?m trying to get more information about what exactly has been done.

A change in "gas flow" wouldn't be sufficient protection against high boost and low octane.

Oh, and fwiw I wouldn't exactly call a destroyed piston "no problems". Problems like that don't typically happen all at once either...every time that car has been run with too much boost on too little octane, the damage gets worse and worse...until a piston fails.

[SupraTT/Iceland]

Originally Posted by pwpanas

A change in "gas flow" wouldn't be sufficient protection against high boost and low octane.

Oh, and fwiw I wouldn't exactly call a destroyed piston "no problems". Problems like that don't typically happen all at once either...every time that car has been run with too much boost on too little octane, the damage gets worse and worse...until a piston fails.

But I thought there were alot of supras that are daily driven and are over 500 hp ? are you saying that you all drive on race gas ? That is really expensive especially for a daily driven car.......and you have to take into consideration that the normal gas here costs 7 dollars a gallon .....it costs much more here then in Usa

But how many hp can I be expecting if i have the boost at 16 psi ?
with a 3" inch HKS Turboback exhaust, Cone HKS airfilter, Bigger HKS pipes to the Intercooler, And another ECU
Would it be around 400 hp ?

[pwpanas]

Originally Posted by SupraTT/Iceland

But I thought there were alot of supras that are daily driven and are over 500 hp ? are you saying that you all drive on race gas ?

Do you mean 500hp or 500rwhp? Either way, yes...most of us run a blend of race gas, and/or meth/water injection, and/or toluene, etc. In general, it's either that, or keep the boost down... Besides, with a huge single turbo, 16psi makes more power than the oem twins do at that boost level. On the downside though, you have to deal with the lag of the huge turbo too...

Originally Posted by SupraTT/Iceland

...That is really expensive especially for a daily driven car.......and you have to take into consideration that the normal gas here costs 7 dollars a gallon .....it costs much more here then in Usa

What can I say, other than the well-known saying: 'you have to pay if you want to to play'. Besides, even if it cost you $20/gallon, a few gallons of race fuel is much cheaper than replacing a blown engine, right?

Originally Posted by SupraTT/Iceland

...But how many hp can I be expecting if i have the boost at 16 psi ? with a 3" inch HKS Turboback exhaust, Cone HKS airfilter, Bigger HKS pipes to the Intercooler, And another ECU
Would it be around 400 hp ?

If you mean 400rwhp, then no...probably closer to 350rwhp...maybe 375rwhp (through a 6spd) on a cold day, if your engine is in excellent shape (i.e. good/high compression #s).

[SupraTT/Iceland]

Hehe Thx for all the help Pwpanas i?ll just remember when i?m going over 16 psi I have to use over 100 octane gas. And never listen to the previous owner. damnit lieing to me that this was all safe I?m just so disappointed that the motor had only been driven 6000 miles