New headers/exhaust for the '85/'86 people! Updated with baseline dyno charts.
05-23-2014, 11:06 PM
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New headers/exhaust for the '85/'86 people! Updated with baseline dyno charts.
Thought all you guys and gals, out there, that have been begging me to build some headers for these early 4 valve engines might enjoy this picture:
Yup. That's a 1.625" stepped to 1.75" stainless header (passenger side) with tuned exhaust pipe length (for the unequal firing "spacing"), with the correct firing order rotation in the collector, ready for final welding. And yes, the lower bell housing (and clutch) will be able to be removed without removing the headers
We are going to install this (with a custom exhaust system), next week.
We will dyno the vehicle first [it currently has a set of Porken's chips, intake spacers (are you kidding me?), and the proper fuel pressure regulator.....the engine is in virtually perfect condition], to get a baseline.
We will then retune and dyno again.
Have a great Holiday, all!
If you don't want to read so many pages, Mike Frye suggests this:
post #34- dyno base line with Porken chips, intake spacers
post #58- pic of headers test fit on engine block (the centerfold!)
post #134- pic of them installed on the car
post #147- more pics of them installed on car
Yup. That's a 1.625" stepped to 1.75" stainless header (passenger side) with tuned exhaust pipe length (for the unequal firing "spacing"), with the correct firing order rotation in the collector, ready for final welding. And yes, the lower bell housing (and clutch) will be able to be removed without removing the headers
We are going to install this (with a custom exhaust system), next week.
We will dyno the vehicle first [it currently has a set of Porken's chips, intake spacers (are you kidding me?), and the proper fuel pressure regulator.....the engine is in virtually perfect condition], to get a baseline.
We will then retune and dyno again.
Have a great Holiday, all!
If you don't want to read so many pages, Mike Frye suggests this:
post #34- dyno base line with Porken chips, intake spacers
post #58- pic of headers test fit on engine block (the centerfold!)
post #134- pic of them installed on the car
post #147- more pics of them installed on car
__________________
greg brown
714 879 9072
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Semi-retired, as of Feb 1, 2023.
The days of free technical advice are over.
Free consultations will no longer be available.
Will still be in the shop, isolated and exclusively working on project cars, developmental work and products, engines and transmissions.
Have fun with your 928's people!
greg brown
714 879 9072
GregBBRD@aol.com
Semi-retired, as of Feb 1, 2023.
The days of free technical advice are over.
Free consultations will no longer be available.
Will still be in the shop, isolated and exclusively working on project cars, developmental work and products, engines and transmissions.
Have fun with your 928's people!
Last edited by GregBBRD; 06-10-2014 at 02:49 PM.
05-24-2014, 12:31 AM
#6
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If you do not do so already, I highly recommend a Blue Blower placed over the airbox as shown below, to blow on the air temp sensor and MAF.
You may find the MAF CO needs to be adjusted with the headers. If you are running the headers with S3.S300s chips and find you need more fuel at WOT even after adjusting the MAF CO, plugging the LH brown wire plugs together (never the EZ green wire plugs) will richen it up a bit.
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05-24-2014, 01:19 AM
#8
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Well.....getting closer to 16V since these should bolt right up 
05-24-2014, 02:31 AM
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05-24-2014, 03:04 AM
#10
Those look very nice.
On the program that some of use for seeing what changes may do what to a certain package, I have found that shorter, larger headers work to increase power up above 4500 while not sacrificing much below that rpm. As in 1-7/8 inch headers, and quite short primaries.
Yes, Long tube headers on a 928, and an E55 (new addition) seem to really add power - especially when there is boost (stock on E55).
With our cars, its almost as important to be able to get that bell housing off as it is to add power!
On the program that some of use for seeing what changes may do what to a certain package, I have found that shorter, larger headers work to increase power up above 4500 while not sacrificing much below that rpm. As in 1-7/8 inch headers, and quite short primaries.
Yes, Long tube headers on a 928, and an E55 (new addition) seem to really add power - especially when there is boost (stock on E55).
With our cars, its almost as important to be able to get that bell housing off as it is to add power!
05-24-2014, 03:25 AM
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05-24-2014, 12:49 PM
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Good that you understand the effort involved in doing it right !! and making it repeatable. Still involves so much time yet when finished it just LOOKS SO CORRECT and almost easy.
