blowers arent as effecient b/c of heat soak.
nitrous makes the motor run cooler, and compared to a whipple or magnacharger it would run better back to back than a s/c motor because of heat soak. vortec and ati use intercoolers which help deter heatsoak.

ryan oxidizr is usin a converter 4.10s slicks exhaust homebrew intake and in the 12s... he has some other stuff also thuogh...
dunno if that was with the single shot or the DP set up....

 

Ryan there is two trucks in my stable as of now that i am working on. 1 is a oo ext cab 5.3 with a single flow and 150 shot nx kit and it went 13.53 at 102.7 on 20 inch gt2 tires. Stock air cleaner assembly ,air filter, pulley ect all stock. Mine is a 02 with pp3, dual exhaust, 150 N.O.S., with Top Gun Pro Fogger nozzle. Brandon as to your answer about heat soak that is not true at normal boost levels. If you over spin the capacity of the blower it is detremental and causes excessive heat. But blowers do make more power than nitros ...Top Fuel answers that ?
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Ryan23silverado:

My truck ran a 13.147 with the stock 265/70R16 General Tires no converter, headers and an intake.

Brandon:

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">ryan oxidizr is usin a converter 4.10s slicks exhaust homebrew intake and in the 12s... he has some other stuff also thuogh...
dunno if that was with the single shot or the DP</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Converter... yup, 4.10's...nope (3.73's actually), Slicks...nope (DOT ET Streets, I could only wish they made a full slick in a 16" rim) and this was a dry 130 HP kit through a single fan spray.

Regarding blowers/supercharging...

"Heat soak" really isn't the problem as much the issue is heat generated by friction created while pressurizing the intake charge. The added heat causes molecular expansion and as such these exited molecules cannot fit in that same space as cooler less exited molecules. You now have a less dense oxygen charge. The intercoolers, more correctly called aftercoolers, are use to reduce this expansion under heat to restore greater O2 density. The more O2 concentration you have in the combustion chamber the more fuel you can burn.

As far as efficiency is concerned... blowers are nowhere near as efficient as nitrous but that is because nitrous isn't a "parasite." S/C's and even T/C's both use power to make power. N2O does not. Theoretically N2O is 100% efficient. Superchargers become less effiecent as RPM increases. As RPM increases it becomes harder to match the demand created by the motor and eventually you will exit the "power zone" of the compressor.

hyde:

First off...welcome to the board...

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">But blowers do make more power than nitros...Top Fuel answers that</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Did you know that at the end of the quarter mile that the Top Fuel superchargers are consuming over 600 HP just to maintain the current boost level.

The reason nitrous vehicles seem to post such good numbers is relative to cylinder pressure and RPM. Nitrous is delivered at a constant rate (unless some kind of progressive controller is used) regardless of rpm. S/C's and T/C's vary with rpm. Since this is true the N2O motor will see much higher low rpm cylinder pressure. This increased low rpm cylinder pressure is what makes for such different ETs from the same peak HP numbers from a S/C and N2O motor. If you could in fact have a supercharger running at peak efficiency rpm all the time you would see more similar ETs from these power adders and if you could elimiate the parasitic nature of a S/C you could have the same ETs...in theory of course.

Richard

BTW- I have run over 500 lbs of nitrous through this current set-up and have not had an issue.

 

well dont i look like a friggin idiot.
oxidizr i confused you with another guy on the 4:10s
eh slicks et streets et drags etc, said slicks b/c i didnt know for sure what tire you were running.

anyways as always, thanks for such good info.

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">well dont i look like a friggin idiot.</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">...sorry Brandon it didn't mean for it to look that way ...or or at least no on purpose. <img border="0" alt="[jester]" title="" src="graemlins/gr_jest.gif" />

Richard

<small>[ June 04, 2002, 12:56 AM: Message edited by: oxidizr ]</small>

 

Richard i do agree with what you have said but when you want to achieve big power, with out the expense of building a solid motor i've always had the best luck and tunable streetablity with blowers, turbo's. I'm not a huge nitros fan, but in this situation it is the cheapest and quickest way to achieve a short term goal of cracking so 4.6 mustangs and the all to common no driving fool in the camaros...lol I still believe that top fuel uses the blower cause they make the most power, cause that wins races and thats a big business. I'm glad to have found this page and hope to have many other good conversations with knowledgeable people. i also have spray many many lbs of nitros.
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