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Old 06-04-2019, 09:57 AM   #1
jstahemi119
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Default Intake air temp

I went to the track this past weekend.It was in 80's with high humidity.The intake air temps were reaching 185*.
My question is,,,,at what IAT will the power be effected and start falling off??
AFR was 13 @ wot.I have a 1071 BDS roots and after a few passes I increased the boost from 6 to 8 to 10 and the MPH only increased 3 MPH
I have been 9.3 @ 146 with 6 lbs through the 4 inch exhaust and it was choking with reversion.This weekend I uncapped the dumpers and hoped the crack the 8's but couldn't get faster than 9.6 with 10 lbs of boost. That was 28* timing and 13 @ wot.
Engine is a 545 2nd gen hemi with fueler aluminum heads.

I was rather disappointed!
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Old 06-04-2019, 02:37 PM   #2
Ron Clevenger
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Default Re: Intake air temp

Carbs.....or ??
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Old 06-04-2019, 03:56 PM   #3
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Default Re: Intake air temp

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Originally Posted by Ron Clevenger View Post
Carbs.....or ??
Pair of SV1 carbs like 1800cfm.
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Old 06-04-2019, 06:01 PM   #4
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Default Re: Intake air temp

3-4 tenths vs. a cool low humidity good weather day pretty easy if it
will take the extra power.
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Old 06-04-2019, 08:09 PM   #5
Ron Clevenger
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Default Re: Intake air temp

"Choking with reversion" what does your cam look like?
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Old 06-05-2019, 11:00 AM   #6
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Default Re: Intake air temp

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Originally Posted by Ron Clevenger View Post
"Choking with reversion" what does your cam look like?
Valve timing @ .050 int open 19 btdc, close 65 abdc
ex 71 bbdc 25 atdc
Dur @ .050 int 264,,ex 276
Lobe sep 113
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Old 06-05-2019, 11:29 AM   #7
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Default Re: Intake air temp

Ron the reversion was with the 4 inch exhaust system with tailpipes out the rear bumper.
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Old 06-06-2019, 12:28 AM   #8
Ron Clevenger
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Default Re: Intake air temp

May be just a combination of parts not working well together. You didn't say which fuel heads, but suspect ports are pretty good size for what your doing. Just my thoughts.
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Old 06-06-2019, 06:12 PM   #9
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Default Re: Intake air temp

Quote:
Dur @ .050 int 264,,ex 276
about 20* short on both, can't imagine it's going to do well.
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Old 06-06-2019, 10:15 PM   #10
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Originally Posted by SAMMY CHRISTIAN View Post
about 20* short on both, can't imagine it's going to do well.
Car is street driven over 1000 miles a season. If I can get to the track 4 or 5 times a year I'm happy. Have the valve covers off to leak it & do a compression test.
If I had that 20* would it still survive through the tailpipes?
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Old 06-07-2019, 04:59 PM   #11
Ron Clevenger
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Originally Posted by SAMMY CHRISTIAN View Post
about 20* short on both, can't imagine it's going to do well.
With the Fuel heads it's already hurting for street use. Motors just not gonna be happy.
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Old 06-08-2019, 12:55 PM   #12
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Originally Posted by Ron Clevenger View Post
With the Fuel heads it's already hurting for street use. Motors just not gonna be happy.
I am quite happy with the street manors,I was disappointed with my last trip to the track.The heat and humidity was high,the N/A guys were of 3 tenths and I couldn't get over 140 MPH when I should have cracked 150.
I'm going over to the garage and leak it down and do a compression test. Imight even take the springs off and see if they are going soft on me.........
I just have to think it was the weather as it has gone 146 MPH throught the tail pipes.

https://www.facebook.com/dan.tomchik...2759128164427/
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Old 06-08-2019, 06:39 PM   #13
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Default Re: Intake air temp

Why is your total timing at WOT only 13 degrees? Seems very low to me. Afr would be quite a bit richer too if it was mine.
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Old 06-08-2019, 07:27 PM   #14
jstahemi119
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Originally Posted by Taff View Post
Why is your total timing at WOT only 13 degrees? Seems very low to me. Afr would be quite a bit richer too if it was mine.
13 was the AFR,timing was 28*


It sure wasn't 70* LMOL

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Old 06-08-2019, 10:54 PM   #15
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Default Re: Intake air temp

Cool Car sir......thanks for the vid.

I would not overthink it until you get to run on a decent weather day.
I have seen air temp and humidity kill some substantial power
on my boosted cars.......more so than NA applications IMO.

Last edited by 427f2; 06-08-2019 at 10:57 PM.
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