Buying a JLT Intake - need help?

fearthesnake

fearthesnake

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Which JLT Intake do you recommend for my current Mods that will stay this way for a while. Only other power mod I might add would be to have the TVS & Elbow ported.

2.4 Upper Pulley
65mm FRPP Throttle Body
Lethal Off-Road X Pipe
3.73 Gear (no impact)

Do I need the Super Big Intake @ 148mm (Will this mate to the 65mm TB?)
or will the Big Air Intake @ 123mm be enough? Says it flows up to 750hp.

The 148mm just looks to darn big - appearance wise.

Thanks.
 
Catmonkey

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The 148 is not necessary until you're in the 800+ rwhp range. Because it's so large, it's not all that efficient at idle and low rpm cruising. I'd also go PMAS over JLT.
 
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07 Black Beauty

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I've run JLT on all 3 of my shelbys, the 123 on my 07 and the 127 on my 13 and current 14. Been very happy with the looks and performance of them. I have heard good things about the PMAS intakes so definitely another possible option.
 
2011 gtcs

2011 gtcs

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Buy a PMAS 120mm intake. Don't waste your money on a JLT, you will have better deliverability and you don't need a screen in the filter to calm down the air before it hits the MAF.
 
fearthesnake

fearthesnake

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2011 gtcs said:
Buy a PMAS 120mm intake. Don't waste your money on a JLT, you will have better deliverability and you don't need a screen in the filter to calm down the air before it hits the MAF.
Click to expand...
Is 120mm big enough? Will that flow up to 750hp? Im guessing Ill be around 720 on next tune.
 
Catmonkey

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fearthesnake said:
Is 120mm big enough? Will that flow up to 750hp? Im guessing Ill be around 720 on next tune.
Click to expand...
It's not really an issue of being big. The main purpose of the larger tube is to slow down the airflow past the MAF sensor and recalibrate the transfer function in the tube to extend the range of the MAF for higher airflow than the factory settings. That can also get recalibrated MAF sensors that extend the range of the transfer function as well. Look at it this way, with a twin bore 72mm throttle body, the combined openings have an area of 12.62 sq. in. A 120mm tube has an area of 17.5 sq. in. That's almost a 40% increase. It's going to take a lot bigger throttle body to make the tube the restriction.
 
fearthesnake

fearthesnake

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Catmonkey said:
It's not really an issue of being big. The main purpose of the larger tube is to slow down the airflow past the MAF sensor and recalibrate the transfer function in the tube to extend the range of the MAF for higher airflow than the factory settings. That can also get recalibrated MAF sensors that extend the range of the transfer function as well. Look at it this way, with a twin bore 72mm throttle body, the combined openings have an area of 12.62 sq. in. A 120mm tube has an area of 17.5 sq. in. That's almost a 40% increase. It's going to take a lot bigger throttle body to make the tube the restriction.
Click to expand...
Makes sense and starting to understand.

How do you know so much about cars, pretty impressive. Your line of work in automotive industry?
 
Catmonkey

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No, but it's been my primary past time for over 45 years. When EFI and computer controls came around in the early 90s, I figured hot rodding was dead for late model vehicles. I started hanging around an EEC-IV forum when there were no tuning vendors, just hackers, in an attempt to bring one of my projects into that technology. Before graphical interface, tuning changes were entered as raw data using an add-on board called the EEC Tuner. We were even able to data log with it, but it was pretty crude and not much data could be captured because of storage limitations. I watched a lot of this stuff evolve into what it is today. I've since been using SCT's tuning software for about 12 years, so I have pretty good working knowledge of tuning parameters. However, the OEMs just keep evolving computer controls and getting more complicated all the time.

I'm running a Whipple 123mm MAF on my car. After seeing pictures of the Ford Racing version they used with their Whipple kit, I set out to make one just like it out of the factory MAF tube/heat shield bucket. Works great and takes someone familiar with these cars to notice it's not stock. While the JLT works, there are more variations in uniformity because it's molded plastic than you'll find with metal or hard plastic MAF tubes.
 
fearthesnake

fearthesnake

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Catmonkey said:
No, but it's been my primary past time for over 45 years. When EFI and computer controls came around in the early 90s, I figured hot rodding was dead for late model vehicles. I started hanging around an EEC-IV forum when there were no tuning vendors, just hackers, in an attempt to bring one of my projects into that technology. Before graphical interface, tuning changes were entered as raw data using an add-on board called the EEC Tuner. We were even able to data log with it, but it was pretty crude and not much data could be captured because of storage limitations. I watched a lot of this stuff evolve into what it is today. I've since been using SCT's tuning software for about 12 years, so I have pretty good working knowledge of tuning parameters. However, the OEMs just keep evolving computer controls and getting more complicated all the time.

I'm running a Whipple 123mm MAF on my car. After seeing pictures of the Ford Racing version they used with their Whipple kit, I set out to make one just like it out of the factory MAF tube/heat shield bucket. Works great and takes someone familiar with these cars to notice it's not stock. While the JLT works, there are more variations in uniformity because it's molded plastic than you'll find with metal or hard plastic MAF tubes.
Click to expand...
That is interesting and thank you for sharing.
 
03 DSG Snake

03 DSG Snake

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Catmonkey said:
I'm running a Whipple 123mm MAF on my car. After seeing pictures of the Ford Racing version they used with their Whipple kit, I set out to make one just like it out of the factory MAF tube/heat shield bucket. Works great and takes someone familiar with these cars to notice it's not stock. While the JLT works, there are more variations in uniformity because it's molded plastic than you'll find with metal or hard plastic MAF tubes.
Click to expand...

Do you have a picture of that setup by chance? Thanks!
 

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