| ~30oZ~ |
What's the safest/highest boost I can tune a Z32 TT to run on, for 91 Octane?
Not that I'm going to take a chance on my motor...but for future. |
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| Inzane |
quote:
Originally posted by ~30oZ~
What's the safest/highest boost I can tune a Z32 TT to run on, for 91 Octane?
Not that I'm going to take a chance on my motor...but for future.
14 psi.
But if you want to be more prudent (like I was this past year), take it down to 13-13.5 psi just to be safe. |
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| ~30oZ~ |
quote:
Originally posted by Inzane
14 psi.
But if you want to be more prudent (like I was this past year), take it down to 13-13.5 psi just to be safe.
and what about with the stage 3 IPP motor I was looking at with the 530BB's? Or is it still 13-13.5 because it's the Octane grade that limits the car to which level of boost it can take? |
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| Inzane |
Well, as a fellow Z Club member proved at the beginning of last year, slapping on 530BBs, manifolds and bigger injectors is not a *magic recipe* that suddenly allows you to be able to run more boost safely on pump gas.
Anyway to sort of answer your question:
With a built engine like you decribed (w/ stronger pistons, etc.) your engine will have more tolerance to detonation. With Kyle's work you'll probably have cleaner combustion in the cylinders too. The bigger turbos will allow you to run cooler exhaust port temperatures for a given boost pressure compared to the smaller stockers. And the larger injectors will give you more headroom before maxing out your injector duty.
^^^ All that should in theory give you a little more cushion and should translate into a higher detonation threshold on 91 octane. However you won't know how much until you're there yourself because every car and every setup tends to respond to our various fuel sources differently. You'll have to experiment. You, me, Mahesh, Rob, Tim, etc. may find from our personal experiences that the maximum "safe" boost on 91 octane may vary by at least half a psi between us.
Anyway to ballpark it, I'd still say with your new setup you should limit yourself to ~14psi. You could try more with controlled experimentation, but just don't be stupid about it.
PS - just as a point of reference, the guys down in the States that enjoy 93 Octane at the pumps are able to run 16psi "safely" with a similar setup. (That alone should be a clue that with 91 octane you should be aiming for something LESS than 16). |
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| Grace Too |
quote:
Originally posted by Inzane
Well, as a fellow Z Club member proved at the beginning of last year, slapping on 530BBs, manifolds and bigger injectors is not a *magic recipe* that suddenly allows you to be able to run more boost safely on pump gas.
Anyway to sort of answer your question:
With a built engine like you decribed (w/ stronger pistons, etc.) your engine will have more tolerance to detonation. With Kyle's work you'll probably have cleaner combustion in the cylinders too. The bigger turbos will allow you to run cooler exhaust port temperatures for a given boost pressure compared to the smaller stockers. And the larger injectors will give you more headroom before maxing out your injector duty.
^^^ All that should in theory give you a little more cushion and should translate into a higher detonation threshold on 91 octane. However you won't know how much until you're there yourself because every car and every setup tends to respond to our various fuel sources differently. You'll have to experiment. You, me, Mahesh, Rob, Tim, etc. may find from our personal experiences that the maximum "safe" boost on 91 octane may vary by at least half a psi between us.
Anyway to ballpark it, I'd still say with your new setup you should limit yourself to ~14psi. You could try more with controlled experimentation, but just don't be stupid about it.
PS - just as a point of reference, the guys down in the States that enjoy 93 Octane at the pumps are able to run 16psi "safely" with a similar setup. (That alone should be a clue that with 91 octane you should be aiming for something LESS than 16).
Edwin,
I pretty much agree with Jason, it must be Christmas. But I think with a new motor and some brake in time you could run 17psi on 91 octane. Now just as Jason has said every motor is different, you just have to test and tune.
Remeber in our cars (stock block) the more boost you run the more you retard the timing. Believe me it will save your motor.
Now of course there are going to be people out there who disagree with me. Thats fine, but instead of burning me, lets help our buddy Edwin
Cheers & Seasons Greetings :beer:
Tim |
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| vorpalz |
Fuel varies widely as well. My turbo detonates at 10 PSI on Petro-Can 91 octane, Mash has had issues with that crap as well. Many people like Shell 91, I run Esso 91 and have been fairly consistent up to 12 PSI. Others don't like Esso, I've had no major problems. I also run the Husky 94 ethanol blend which seems to ward off detonation; the proof was when I was pulling in 5th on the highway. With any 91 octane fuel (regardless of vendor) After 1 or 2 pulls in 5th from 80-120K I would be in safety boost. Always. With the 94, I could pull as many times as I liked at a fairly solid 12 PSI. I use the Husky 94 with a gallon of 109 octane VP race fuel at the dyno, but that's a bit much for daily running.
I am keenly following the water injection crowd, as this seems to be an effective way of cooling the intake and allowing higher boost on 91 fuel.
Regards, |
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| ~30oZ~ |
hmm ok thanks for the help guys. seems like 14PSi on a forged motor and 13-13.5PSi on stock...I'm guessing 14PSi is a lot of power on 530BB's....:thumbup:
Is there anyway to cure detonation? |
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| 95IntegraRS |
Water/meth injection.
You can maximize your horsepower on pump gas.
With water/meth installed, you could safely bump the boost up because it effectively increases your octane rating (methanol has a massive octane rating) and decreases air intake temps, both cures for detonation under boost.
:thumbup: |
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| vorpalz |
quote:
Originally posted by ~30oZ~
Is there anyway to cure detonation?
Better fuel and cooler intake temps. Up the octane as mentioned in my above post and get:
Good IC's (HKS, Stillen, Greddy, ASHSpec)
Colder spark plugs (NGK PFR6B-11B's if you don't have them already)
and for extra added insurance, Water/Methanol injection kit. They are becoming more available and many Z owners are running them. Check Spectrum(WI)'s posts on tt.net.
Regards, |
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| ~30oZ~ |
| Yup that' what I keeping hearing, I'm gonna let Mahesh experiment with this one.:thumbup: will your setup be ready for spring Mahesh? or anyone else? Did anyone find a kit that uses the headlight washer tank? or do I have to rip it out and use the provided tank that comes in the tank? |
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| MixManMash |
| Well, there are a couple of us who will be experimenting this winter with W/I. There are ways you can re-use the headlight washer tank... It's just a little tricky. Pending how much time I get over the next four months, I may have it installed just in time for the start of the season. |
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