C5 427 Dyno Results
07-06-2007, 04:36 PM
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C5 427 Dyno Results Today I rented a local DynoJet and tuned my 427. This is only the second time that I have done any tuning so I am still quite new at it.
This is the setup:
The conditions today at dyno time were 89 degrees, 15% relative himidity, and the barometric pressure was 24.12. The baro is not a typo. I am at high altitude.
The numbers were 494 rwhp at just over 5900 rpm and 492 rwtq at about 4600 rpm.
Look at that torque!
This is the setup:
- SDPC 427 shortblock based on a LS7 block
- Livernois motorsports stage 2 L92 heads
- Comp Cams 230/242 115+0 cam
- stock L76 intake with stock 90mm TB and 39# injectors
- Dynatech 1-3/4" headers
- stock Z06 cat back
The conditions today at dyno time were 89 degrees, 15% relative himidity, and the barometric pressure was 24.12. The baro is not a typo. I am at high altitude.
The numbers were 494 rwhp at just over 5900 rpm and 492 rwtq at about 4600 rpm.
Look at that torque!
07-06-2007, 04:50 PM
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Talk about a flat line!! That torque line look great. Nice job.
How does it idle? As fas as making 500/500 I'd say your there (on a cooler day).
Congrats!!
Bob K.
How does it idle? As fas as making 500/500 I'd say your there (on a cooler day).
Congrats!!
Bob K.
07-06-2007, 06:48 PM
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It idles nicely at 900. It has some lope but not a lot.
Originally Posted by RGKSR
That torque line look great. Nice job.
How does it idle? As fas as making 500/500 I'd say your there (on a cooler day).
Congrats!!
Bob K.
How does it idle? As fas as making 500/500 I'd say your there (on a cooler day).
Congrats!!
Bob K.
07-06-2007, 06:49 PM
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Looks like a wonderful street engine! I bet that thing will snap your head back at any speed.
So at sea level that would be 600+ rwhp, is that right?
So at sea level that would be 600+ rwhp, is that right?
Last edited by Gannet; 07-06-2007 at 06:55 PM.
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07-06-2007, 07:15 PM
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High altitude kills performance. Yes that really is a 1.28 correction factor. The shop with the dyno is located at an altitude of 6370 feet.
Originally Posted by JustinOlson
Is that really a 1.28 correction factor? So uncorrected it was making 386 at the wheels? High elevation is rough.
Justin
Justin
07-08-2007, 11:32 AM
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I think that there is some more in it too. I am still learning to tune so I am sure that some is missing due to that.
Originally Posted by the_merv
Nice numbers..smooth too..that Engine has some more in it easily.
07-08-2007, 11:34 AM
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I am going to spend some time doing idle tuning in the coming week. It idles pretty good now but a little tuning should make it even better.
Originally Posted by pkincy
Super curve. Spend some time tuning at idle and you will get that to idle smoothly at 700 rpm.
Perry
Perry
