Pistons for N/A???
11-29-2006, 03:37 AM
#1
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Pistons for N/A???
Ok well I know everyone says high compression pistons are good for naturally aspirated cars and all, but what kinda gains are we talking about for 11.0:1? I know JE pistons makes both of these... what kinda gains would I see with just this added and would I need to change injectors and get a piggyback ecu for it to work properly? Anyone with pistons in a naturally aspirated car? Tried to search but didn't find much... Also do I have to get new rods with this?
Plus does anyone know of any good tuner shops around atlanta???
Plus does anyone know of any good tuner shops around atlanta???
sorry i can't help with the questions though.
11-29-2006, 09:50 PM
#4
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hey. if u got to clubsciontc there is a memeber there that has robs and pistons and a piggy back and all. he can tell u his gains and everything. tyr there for info. also ZPI sells motor packages for the tc. look into it.
12-01-2006, 01:10 AM
#10
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Scion Evolution
Upper CompressionRatio numbers are stock, and the Right Numbers would be the new compression ratio. U look for example on the upper area for 9:1 (tC=9.6:1) and then look for a new desired compression ratio 11:1 (11.5:1), then u would see that with only the compression ratio increase and no tuning u would aproximately gain around 5.5whp. APROXIMATELY. :D
12-01-2006, 03:44 AM
#15
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Scion Evolution
what do you mean? With that chart? Well I just anylized it as well as I could with the expirience I have. The Higher the CR the more pressure in the cylinder when fuel and air are mixed. With that new pressure the fuel/air mix is further joined and the explosion will be bigger, since conbustion will occur more easily. Since there is more pressure, also more detonation is prone. That's why a better octane fuel rating must be used. The cylinder will be so hot after the explosion that it will easily ignite the fuel entering sooner and cause a catastrophic event on the cylinder. Hence the higher the octane rating the harder or later the fuel will ignite.
12-01-2006, 03:17 PM
#16
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Originally Posted by soros151
Here is the rule of thumb.
Just out of curiosity what would be a range if the injectors were added with just the pistons and it was tuned properly?
12-01-2006, 04:09 PM
#17
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Scion Evolution
Well what Injectors? Cause the amount of cc's will ultimatly maybe hold u back. Like the 410-440cc of the Supercharger will only hold up to maybe 275-300whp. When tuning for N/A, u will try to lean the mix at WOT to create extra power. When u care for injector amount, maybe it would be for boosted appl. Since the stock injectors will likly still hold until maybe, MAYBE, 200whp.
RC web: Injector Flow Rate Calculation Page
RC web: Injector Flow Rate Calculation Page
12-01-2006, 05:16 PM
#18
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Well say I got like 370cc injectors would that work for a N/A application? Also what is WOT?
As for the injectors themsleves once they are put in would I have to get something like the greddy emange to properly tune it? Or will they work fine once put in?
Sorry for all the questions Im kinda new to heavy modding like this.
As for the injectors themsleves once they are put in would I have to get something like the greddy emange to properly tune it? Or will they work fine once put in?
Sorry for all the questions Im kinda new to heavy modding like this.
12-01-2006, 05:42 PM
#19
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Scion Evolution
Okay, we have OEM 370-375cc. When we are stock we are N/A. WOT= Wide Open Throttle. Yes u can tune the stock OEM injectors with the e-manage. How much whp u think u will be making? If it is over the 80% duty of the OEM injectors then u would have to change them to a higher setup.
If I were to make 200whp, that would be around 236B.H.P.
Keeping that in mind at an around 43.5PSI of fuel/ and .80 or 80% duty cycle, the recommended max for any injector, and Brake Specific Fuel Consumption of .45 for N/A, then at the BHP of 236 or around 200whp, the minimun injector cc that must be used is theoreticaly 351cc with 33.38Lb/Hr.
to sum up. We can maybe use the stock Injectors until 250BHP or 212.5whp.
BIG IF un the max whp supported by OEM injectors.
If I were to make 200whp, that would be around 236B.H.P.
Keeping that in mind at an around 43.5PSI of fuel/ and .80 or 80% duty cycle, the recommended max for any injector, and Brake Specific Fuel Consumption of .45 for N/A, then at the BHP of 236 or around 200whp, the minimun injector cc that must be used is theoreticaly 351cc with 33.38Lb/Hr.
to sum up. We can maybe use the stock Injectors until 250BHP or 212.5whp.
BIG IF un the max whp supported by OEM injectors.