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Forced Induction Turbo, Supercharger, Methanol, Nitrous


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Old 12-11-2015, 09:04 AM   #85
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CTS-V & ZL1 guys with pullied Eaton TVS R1900 blowers shoot for <140-145F IAT2's at the drag strip (that's the temp the stock tune starts retarding timing). Staying at or under 140F on a road course is impressive. Definitely nothing wrong with that setup.
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Old 12-11-2015, 10:55 AM   #86
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I never said it wasnt track worthy, I just said i'd want to see lower IATs for track.

This kit has been marketed as massivley upgradable with its 1320 blower and the smaller pullies but the reality is you are going to be looking at some very high IATs with more power.

I'm trying to figure out the bottom scale of that graph. It says seconds. So 4000 seconds for the oil to get up to temp. That's 67 minutes. Doesnt sound correct to me?

Is that data points at 50Hz or something?

The x-axis is whatever the default sampling frequency is in ECUtek. I goofed when putting the axis title and listed Seconds, but realized that wasn't right given the fact that this data was taken over a span of about 20 minutes.


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Old 12-11-2015, 11:24 AM   #87
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I never said it wasnt track worthy, I just said i'd want to see lower IATs for track.
The question remains, why? What is wrong with consistent 55C IATs? What problems do you see it causing?
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Old 12-11-2015, 12:29 PM   #88
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Consistency. There may be no other problems other than the fact that a 50F increase in air temp will result in 10% less air density, so you lose about 25WHP.
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Old 12-11-2015, 12:36 PM   #89
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The question remains, why? What is wrong with consistent 55C IATs? What problems do you see it causing?
So he can justify his Cosworth purchase j/k @ajc209
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Old 12-11-2015, 12:48 PM   #90
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don't forget high IAT's don't just mean less air density they also mean more knock sensitivity
so a setup with 55-60C ( 130-140F) will not tolerate the same amount of spark advance as a setup with 25-30C so the 25WHP loss due to air temp will be larger than this due to the lower knock limit
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Old 12-11-2015, 12:51 PM   #91
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haha :o


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Old 12-11-2015, 01:25 PM   #92
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Consistency. There may be no other problems other than the fact that a 50F increase in air temp will result in 10% less air density, so you lose about 25WHP.
Erm.... how is consistent 25C air temps any different to consistent 55C with regards to consistency?

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don't forget high IAT's don't just mean less air density they also mean more knock sensitivity
so a setup with 55-60C ( 130-140F) will not tolerate the same amount of spark advance as a setup with 25-30C so the 25WHP loss due to air temp will be larger than this due to the lower knock limit
And I covered that. But all being the same, if a car makes 250whp with 55C intake temps consistently and other with 25C intake temps. One is no better than the other if neither is knocking. We get that lower IATs are better for a number of reasons, but that was never the argument here. The suggestion was that having higher IATs is detrimental to tracking the car...
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Old 12-11-2015, 02:05 PM   #93
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Does anybody know what temperatures other superchargers are experiencing?

Cosworth?
Harrop?
Sprintex?

Jackson Racing?
Kraftworks?

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Old 12-11-2015, 02:12 PM   #94
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With JRSC on a 40F day, is saw 80F-110F IAT and this range was consistent each lap (temps correspond to RPM range 4500-7200)
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Old 12-11-2015, 02:31 PM   #95
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Does anybody know what temperatures other superchargers are experiencing?

Cosworth?
Harrop?
Sprintex?

Jackson Racing?
Kraftworks?

Thanks,
-Aaron
Harrop is probably a way off before anyone gets any data, I guess that's the real genuine comparison. The Cosworth kit claims a 7-10C increase over ambient at max revs but @ajc209 will get some data up soon like the graph posted above.

As per @SleeplessI'd expect the centrifugals to be better on IATs due to A2A intercooler and they are more efficient
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Old 12-11-2015, 02:41 PM   #96
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^ lets see the logs with knock and ignition advance being recorded with the higher and lower IAT setups on track. I'm sure fuel quality along with how the base ignition timing is setup will also have a say on the amount of knock being seen, but just for shits and giggles.
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Old 12-11-2015, 06:02 PM   #97
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Yep ill post some logs when I get a chance to cane it on track. Next trackday is in February. It'll be on another thread though, not here of course as I think I've already said too much.







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Old 12-12-2015, 06:28 AM   #98
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Only skimmed this discussion, but how are you measuring intake temps on cars with draw through rather than blow through mafs? I do it all the time, but not with the factory sensor. If that's what people with draw through mafs are doing, you are wasting your time.

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