Will WI enable 12 psi @91 octane / GT2560 on a stock VVT motor?
And run close to MBT or at least have EGT's under control?
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P.S. Don't clutter this thread with "build the motor and turn it up to 20 psi" posts please.
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have you read any WI threads? Also, do you mean "water" injection or "methanol" water injection?
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Aren't you still in the efficiency island at that point?
I don't see why not if you're at 77friggin% efficiency....even without WI. Am I missing the point of this thread? |
I agree, you really should not be having EGT issues at that boost with a properly tuned spark map.
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Water, no methanol.
Main point is, can the 10:1 c/r work at 12 psi / 91 octane+WI? I know from experience that 9.5:1 and 10 psi is marginal at 91 octane without WI. EGT issues are possible if spark needs to be retarded a lot to prevent knock. |
Doesnt higher intake temps and/or too much timing cause higher EGT's?
sounds like you need dyno time for the spark mark and let them determine boost level/spark ratio. More boost = more power... But, more advanced timing does also. I say put WI in and get a good tune. Or the answer you were looking for, Yes |
what power level is a 2560 at at 12 psi on an 01 motor? 275 rwhp?
hell, try it without water. |
advance and egt are inverse relationships
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Originally Posted by y8s
(Post 431254)
what power level is a 2560 at at 12 psi on an 01 motor? 275 rwhp?
hell, try it without water. Probably 260 whp. |
Probably. Meth would get you there for sure.
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Jason,
Can you get e85 reasonably? Chris |
Originally Posted by Miatamaniac92
(Post 431336)
Jason,
Can you get e85 reasonably? Chris Jason, Sav was able to hit MBT @ 11 psi on a stock 99 motor with a 2554 without WI, i dont see why WITH WI you wouldnt be able to do the same. |
Well even a stock 2001 will ping on 87 octane...
The difference between 10:1 and 9.5:1 I think is pretty significant in terms of ping resistance... |
I dont know if the cooling of water alone will get the job done. With the adition of 10-15% methanol i say its acheivable.
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Originally Posted by JasonC SBB
(Post 431374)
Well even a stock 2001 will ping on 87 octane...
The difference between 10:1 and 9.5:1 I think is pretty significant in terms of ping resistance... The question can't really be answered without experimentation. I think you'd know more looking for MBT at the boost target you want (rich mix for now) and see how far you get at various RPMs that are knock prone. |
At what boost will you start spraying water? I occasionally run 12 PSI on a 01 and spray 100% water meth at 5.5 psi with no problems so it all depends like Y8 said
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Originally Posted by y8s
(Post 431512)
I guess I underestimated the whole role of MBT (or didn't read closely). I take back what I said about not running water.
The question can't really be answered without experimentation. I think you'd know more looking for MBT at the boost target you want (rich mix for now) and see how far you get at various RPMs that are knock prone. |
Originally Posted by magnamx-5
(Post 431752)
MBT scales with VE and bsfc mat so you are not wrong you are just thinking of mbt as a set variable when it is actualy very maleable given intake flow, temperature, and overall chemical composition in the combustion process.
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