most boost on pump gas?
05-12-02, 01:37 PM
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most boost on pump gas?
Assuming one has enough fuel, how much boost can safley be run on pump gas, say 93-94 octane? I've heard only 15-16 psi, past that you risk detonation. Why would it detonate if you have enough fuel?
05-12-02, 02:32 PM
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You can have all the fuel in the world and still be limited to 15-16psi on pump. Some say if you retard the timing you can tune for 20 psi, but I wouldn't play that game. All engines are different. Take for example the Mitsubishi blocks, they can eat 20-22psi on pump easy. (Their main problem is that they hvae little top end power.) The rotary is very fickle. Use our high reving potential to kick some as$. At 15psi on ported and tuned rotary is good for around 400-420rwhp. That should be enough for 10's on the 1/4 on a single turbo set up...
05-12-02, 02:44 PM
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I have been running 18psi on 93 octane for a long time with no problems. My timing hasn't been retarded to make up for anything and my air/fuel was tuned to 11:5:1 on the dyno.
05-12-02, 05:23 PM
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Originally posted by canman6969
is 93 octane premium?
what the hell has 87? a voltswagon??
damn that is garbage...
is 93 octane premium?
what the hell has 87? a voltswagon??
damn that is garbage...
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05-12-02, 05:26 PM
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Originally posted by 94touring
I have been running 18psi on 93 octane for a long time with no problems. My timing hasn't been retarded to make up for anything and my air/fuel was tuned to 11:5:1 on the dyno.
I have been running 18psi on 93 octane for a long time with no problems. My timing hasn't been retarded to make up for anything and my air/fuel was tuned to 11:5:1 on the dyno.
05-12-02, 08:39 PM
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Originally posted by wankawankel
That's good. Crispeed has a few of his customer running 20psi daily. It's not surprising to hear about 7's out there running over 15psi. By the way what EMS are you using and who tuned it?
That's good. Crispeed has a few of his customer running 20psi daily. It's not surprising to hear about 7's out there running over 15psi. By the way what EMS are you using and who tuned it?
05-13-02, 01:34 AM
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Originally posted by 13BAce
It's basically for the same reason you shouldn't run 15-16 PSI on 87 octane.
It's basically for the same reason you shouldn't run 15-16 PSI on 87 octane.
BUT I have lower compression rotor and Matt tuned my E6K also.
05-13-02, 01:34 AM
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How about 91 octane? I'll be moving to CA soon in an area where 91 is normally what you'd find.
how much boost can I run with say a T04E and a goal of 400 WHP? it would have to be tuned more for safety rather than all out power.
any input?
TIA
how much boost can I run with say a T04E and a goal of 400 WHP? it would have to be tuned more for safety rather than all out power.
any input?
TIA
05-13-02, 01:42 AM
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Originally posted by ludeowner
How about 91 octane? I'll be moving to CA soon in an area where 91 is normally what you'd find.
How about 91 octane? I'll be moving to CA soon in an area where 91 is normally what you'd find.
05-13-02, 02:13 AM
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Yeah, to add to this, how much boost can I run my '89 T2 with stock injectors and an FCD? Safely. And also, what will the max be on 91 Octane gas? What about 87 and 89? Can anyone explain what limits the boost in relation to the octane? Seems to me it would be heat limited (more boost, higher heat) but then wouldn't a different intercooler alter this? Possibly be more like "How much boost can I run on a stock intercooler?" I dunno, I'm just thinking outloud...
05-13-02, 05:53 AM
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Originally posted by BlackDragon
Yeah, to add to this, how much boost can I run my '89 T2 with stock injectors and an FCD? Safely. And also, what will the max be on 91 Octane gas? What about 87 and 89? Can anyone explain what limits the boost in relation to the octane? Seems to me it would be heat limited (more boost, higher heat) but then wouldn't a different intercooler alter this? Possibly be more like "How much boost can I run on a stock intercooler?" I dunno, I'm just thinking outloud...
Yeah, to add to this, how much boost can I run my '89 T2 with stock injectors and an FCD? Safely. And also, what will the max be on 91 Octane gas? What about 87 and 89? Can anyone explain what limits the boost in relation to the octane? Seems to me it would be heat limited (more boost, higher heat) but then wouldn't a different intercooler alter this? Possibly be more like "How much boost can I run on a stock intercooler?" I dunno, I'm just thinking outloud...
05-13-02, 06:03 PM
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Originally posted by 13BAce
If you just have an FCD and no other fuel mods then you really shouldn't go over 10 PSI. If you get a good FMIC and some sort of fuel computer then 12-14 PSI should be ok, depending on how good your motor is.
If you just have an FCD and no other fuel mods then you really shouldn't go over 10 PSI. If you get a good FMIC and some sort of fuel computer then 12-14 PSI should be ok, depending on how good your motor is.
Originally posted by wankawankel
Damn! How many times do you attempt to hit full boost? I'm assuming you don't tack out all the time. (bring it to redline at higher speeds).
Damn! How many times do you attempt to hit full boost? I'm assuming you don't tack out all the time. (bring it to redline at higher speeds).
Oh, BTW, we have 98RON pump fuel in Australia
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