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Dyno before and after Headers 🤷🏼*♂️

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Old 07-24-18, 10:15 AM
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yoshua60
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Default Dyno before and after Headers 🤷🏼*♂️


Orange is before blue is after PPE headers. Dyno is practically the same. The temperature during Dyno was about 32F before headers and 96F after. The tech noticed the AF to be around 13.3 vs in the 12s before. Just curious what you guys think. Mods are FBO, RR tuned intake, Magnaflow Cats and Exhaust. TIA.
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Old 07-24-18, 10:49 AM
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Originally Posted by yoshua60


Orange is before blue is after PPE headers. Dyno is practically the same. The temperature during Dyno was about 32F before headers and 96F after. The tech noticed the AF to be around 13.3 vs in the 12s before. Just curious what you guys think. Mods are FBO, RR tuned intake, Magnaflow Cats and Exhaust. TIA.
You need a reflash, the ecu is ****ing you.

~Dv8
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Old 07-24-18, 11:12 AM
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What exhaust? Your before looks high, stock should be between 345 and 355 RWHP. Your after looks low, headers with exhaust should be in the 390s at the wheels. my last Dyno, and few years ago I was at 392 and a friend without cats was at 399.

Lou
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Old 07-24-18, 12:06 PM
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You need to remove the cover on the RR intake for best results per RR with the tuned intake on a dyno. Also you should have went with comparable temps. A 60 deg difference is obviously going to rape your IAT which vastly affects your timing so its not even really a fair comparison.
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Old 07-24-18, 01:26 PM
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Blue graph looks bumpy like it’s pulling timing. The air temp is definitely affecting power output. The leaner af ratio indicates more air is flowing, all else being equal
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Old 07-24-18, 04:55 PM
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Originally Posted by liquidtek
You need to remove the cover on the RR intake for best results per RR with the tuned intake on a dyno. Also you should have went with comparable temps. A 60 deg difference is obviously going to rape your IAT which vastly affects your timing so its not even really a fair comparison.
this. You can’t compare the two. That’s a massive difference in air density.
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Old 07-24-18, 05:21 PM
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How is Texas 32F degrees in the summer?
But agree with others here, heat soak will effect this car, especially with the RR tune.
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Old 07-24-18, 05:40 PM
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Here in Indy we can see cars ET change by a half second between the humid summer and the cool fall. It makes a massive difference. You should make sure you have a good tune and just dyno when the temperature drops again, this time with the air box lid off. Your numbers will be better.
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Old 07-25-18, 11:20 AM
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Originally Posted by flowrider
What exhaust? Your before looks high, stock should be between 345 and 355 RWHP. Your after looks low, headers with exhaust should be in the 390s at the wheels. my last Dyno, and few years ago I was at 392 and a friend without cats was at 399.

Lou
Magnaflow Exhaust and hiflow cats
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Old 07-25-18, 11:24 AM
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Originally Posted by liquidtek
You need to remove the cover on the RR intake for best results per RR with the tuned intake on a dyno. Also you should have went with comparable temps. A 60 deg difference is obviously going to rape your IAT which vastly affects your timing so its not even really a fair comparison.
Thanks! Good to know for next time. Ya, I'm in Houston, so I won't see those temps for 6 months, if I even see them again. Lol. I knew it wouldn't be ideal, but I thought I'd see some gain at least, since it does feel much faster. But I get it, not apples to apples. FWIW, both dynos were performed the same way (neither one had the airbox removed). I'll check again in winter.
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Old 07-25-18, 11:25 AM
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Originally Posted by msgs350
How is Texas 32F degrees in the summer?
But agree with others here, heat soak will effect this car, especially with the RR tune.
Lol. Especially HTX! But its the weather. I scheduled it around work, and I got lucky with a cold front in the winter.
Last edited by yoshua60; 07-25-18 at 11:36 AM. Reason: Misspelled
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Old 07-25-18, 11:57 AM
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What's your KCLV out of curiosity
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Old 07-25-18, 12:32 PM
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Originally Posted by msgs350
How is Texas 32F degrees in the summer?
I thought I was the only one that noticed that, I would think that in itself would make a huge difference it was a lot hotter in the after from 32F before to 92F after
Last edited by glerink; 07-25-18 at 12:38 PM.
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Old 07-25-18, 12:36 PM
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I can’t wait until fall for some drag strip hooligans. I hope to be faster.

what is KCLV?
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Old 07-25-18, 12:59 PM
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Originally Posted by Jwconeil
I can’t wait until fall for some drag strip hooligans. I hope to be faster.

what is KCLV?

I had to look it up. Idk. Does it display in the OBD handheld?
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