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jstahemi119 06-04-2019 09:57 AM

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:confused:
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!:smt093

Ron Clevenger 06-04-2019 02:37 PM

Re: Intake air temp
 
Carbs.....or ??

MOPARJAKE 06-04-2019 03:56 PM

Re: Intake air temp
 
Quote:

Originally Posted by Ron Clevenger (Post 70933927)
Carbs.....or ??

Pair of SV1 carbs like 1800cfm.

427f2 06-04-2019 06:01 PM

Re: Intake air temp
 
3-4 tenths vs. a cool low humidity good weather day pretty easy if it
will take the extra power.

Ron Clevenger 06-04-2019 08:09 PM

Re: Intake air temp
 
"Choking with reversion" what does your cam look like?

jstahemi119 06-05-2019 11:00 AM

Re: Intake air temp
 
Quote:

Originally Posted by Ron Clevenger (Post 70935557)
"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

jstahemi119 06-05-2019 11:29 AM

Re: Intake air temp
 
Ron the reversion was with the 4 inch exhaust system with tailpipes out the rear bumper.

Ron Clevenger 06-06-2019 12:28 AM

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.

SAMMY CHRISTIAN 06-06-2019 06:12 PM

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.

jstahemi119 06-06-2019 10:15 PM

Re: Intake air temp
 
Quote:

Originally Posted by SAMMY CHRISTIAN (Post 70944873)
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?

Ron Clevenger 06-07-2019 04:59 PM

Re: Intake air temp
 
Quote:

Originally Posted by SAMMY CHRISTIAN (Post 70944873)
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.

jstahemi119 06-08-2019 12:55 PM

Re: Intake air temp
 
Quote:

Originally Posted by Ron Clevenger (Post 70949157)
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/

Taff 06-08-2019 06:39 PM

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.

jstahemi119 06-08-2019 07:27 PM

Re: Intake air temp
 
Quote:

Originally Posted by Taff (Post 70953619)
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

427f2 06-08-2019 10:54 PM

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.


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