how much nitrous through radix
#34
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So, if I adjust the table to reduce timing in order to run nitrous the PCM will run this reduced timing at every WOT run, correct? So this means when I'm not spraying I will see a small?? hp drop because of the reduced timing and no nitrous? Being FI, I'm only running 18-20* @ WOT anyway. Would I need to turn down even more because of the N2O? What are guys who have actually done this running in that table? 16*?
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Originally Posted by 1SlowHoe
So, if I adjust the table to reduce timing in order to run nitrous the PCM will run this reduced timing at every WOT run, correct? So this means when I'm not spraying I will see a small?? hp drop because of the reduced timing and no nitrous? Being FI, I'm only running 18-20* @ WOT anyway. Would I need to turn down even more because of the N2O? What are guys who have actually done this running in that table? 16*?
#36
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running a dry shot on a radix. that's a great way to run lean. if you have a radix that runs hard at all, you're maxing the maf's capable reading to start with. even if you extended the maf's range by descreening it and rescaling it's tables, i think the nitrous would still run you again into maxing that. we discussed this before for a naturally asperated application (Link ), but hadn't tried it yet. as far as putting nitrous through the radix though, a 50 shot has been performed on a SSS with success even with the 2.9" pulley and 10.0:1 compression. i would say on a standard compression setup a 75 shot should be easily done, only on race fuel would i try it though.
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As a side note.... my IAT's never reflected the drop in air temp that I received from the N2O. So.... if you are thinking about basing timing off a change in IAT I would suggest you consider abandoning that plan. Seriously... a 50 shot showed nothing to the PCM. I would guess this is related to the relatively small ratio of N2O to Air AND the fact that the Radix IAT is located in a big aluminum case that tends to be hot right about time you are hitting the N2O.
It MIGHT show a drop in IAT to the sensor if you ran less boost, but I can't confirm that.
Some may recall the post from John Ulaszek (spelling?) about his tests with that thermocouple inserted into the Radix pressurized cavity giving different readings than the PCM IAT sensor. They were hotter temps that the PCM reported.
I don't doubt for second that the N2O gives a temp drop... but in my experience the IAT wasn't into the airstream far enough to really notice.
It MIGHT show a drop in IAT to the sensor if you ran less boost, but I can't confirm that.
Some may recall the post from John Ulaszek (spelling?) about his tests with that thermocouple inserted into the Radix pressurized cavity giving different readings than the PCM IAT sensor. They were hotter temps that the PCM reported.
I don't doubt for second that the N2O gives a temp drop... but in my experience the IAT wasn't into the airstream far enough to really notice.
#38
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Originally Posted by 1SlowHoe
So, if I adjust the table to reduce timing in order to run nitrous the PCM will run this reduced timing at every WOT run, correct? So this means when I'm not spraying I will see a small?? hp drop because of the reduced timing and no nitrous? Being FI, I'm only running 18-20* @ WOT anyway. Would I need to turn down even more because of the N2O? What are guys who have actually done this running in that table? 16*?
I've run more than 16 degress of timing with NO2 but I've never had a stock engine for more that a month or two. Forged internals are always best when the budget permits. The stock LS1 block and pistons should be good for a 75shot if you don't get carried away with the timing.
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