Custom intake for stock S4 cars?
#16
Archive Gatekeeper
Rennlist Member
Rennlist Member
I knew that titling a thread 'aural sex' would be helpful to find it in the future.
https://rennlist.com/forums/928-foru...sentation.html
And the lead-in thread:
https://rennlist.com/forums/928-foru...me-time-2.html
https://rennlist.com/forums/928-foru...sentation.html
And the lead-in thread:
https://rennlist.com/forums/928-foru...me-time-2.html
#17
Former Vendor
maybe they'll make another one of this "one-off" if you call them with $$ in hand.
https://rennlist.com/forums/928-foru...2v-intake.html
https://rennlist.com/forums/928-foru...2v-intake.html
The most important thing, for me. is the designing and testing....making improvements.
After I'm happy, I move on to something else. Whatever just got developed gets used in house, of course. As I mentioned above, some pieces are sold to the public, but a lot of pieces never leave here on anything but my own client's cars.
#18
Nordschleife Master
I think that the S4 engine intake and exhaust are reasonably well balanced for the intended purpose from the factory.
To get more normally aspirated power from it with the stock 5.0L bottom end, I think that the main thing to keep in mind is that the stock bottom end doesn’t really want to run well much above the stock redline. If you’re living under 7000 rpms, long tube small diameter headers, higher compression, 16 inch total intake tract length, small and straight intake runners, and (reasonably high overlap, aggressive acceleration and velocity, relatively short duration) cams would probably be the way to go. I’m mostly thinking forced induction, so this is just the hypothetical direction I’d go with a normally aspirated engine.
To get more normally aspirated power from it with the stock 5.0L bottom end, I think that the main thing to keep in mind is that the stock bottom end doesn’t really want to run well much above the stock redline. If you’re living under 7000 rpms, long tube small diameter headers, higher compression, 16 inch total intake tract length, small and straight intake runners, and (reasonably high overlap, aggressive acceleration and velocity, relatively short duration) cams would probably be the way to go. I’m mostly thinking forced induction, so this is just the hypothetical direction I’d go with a normally aspirated engine.
#19
Former Vendor
I knew that titling a thread 'aural sex' would be helpful to find it in the future.
https://rennlist.com/forums/928-foru...sentation.html
And the lead-in thread:
https://rennlist.com/forums/928-foru...me-time-2.html
https://rennlist.com/forums/928-foru...sentation.html
And the lead-in thread:
https://rennlist.com/forums/928-foru...me-time-2.html
I don't see why a GT wouldn't respond just as well.
#20
Rennlist Member
End game for me would be converting my 89 to Miller cycle combustion. But that is a subject for a different time.
I saw a thread years ago where the areas and cavities behind and around the bellmouths in the stock S4 intake were filled with epoxy and netted a 20 HP gain (Dyno tested) IIRC with around $20 in materials.
I'm probably going to do this to the spare S4 manifold I have lying around and see how much it wakes up my stock 200K mile bottom end.
I saw a thread years ago where the areas and cavities behind and around the bellmouths in the stock S4 intake were filled with epoxy and netted a 20 HP gain (Dyno tested) IIRC with around $20 in materials.
I'm probably going to do this to the spare S4 manifold I have lying around and see how much it wakes up my stock 200K mile bottom end.
#21
Administrator - "Tyson"
Lifetime Rennlist
Member
Lifetime Rennlist
Member
#22
Three Wheelin'
Thread Starter
[color=#222222]I saw a thread years ago where the areas and cavities behind and around the bellmouths in the stock S4 intake were filled with epoxy and netted a 20 HP gain (Dyno tested) IIRC with around $20 in materials.
Erik: have read this post a few times and still don't know "exactly" how and what
was done
https://rennlist.com/forums/928-foru...o-results.html
#23
Developer
This is the direction I am heading. We are just taking steps towards it - the manifold we just made is our 3rd intake manifold for the 928 (one for 16v, two now for 32v) and we like the results.
The next iteration of this intake will fit under the hood of a 928, and I will test it on a stock 5.0L 928 motor. We now know that a stroked 6.4L 928 is really choked off by the installation of a stock 5.0L intake manifold (154 HP); but what I do NOT know is what the gains might be on a stock 5.0L motor.
We are going to find out.
The end-game for us is an affordable bolt-on aftermarket manifold for the 1987-1995 928. That's what our goal is.
The next iteration of this intake will fit under the hood of a 928, and I will test it on a stock 5.0L 928 motor. We now know that a stroked 6.4L 928 is really choked off by the installation of a stock 5.0L intake manifold (154 HP); but what I do NOT know is what the gains might be on a stock 5.0L motor.
We are going to find out.
The end-game for us is an affordable bolt-on aftermarket manifold for the 1987-1995 928. That's what our goal is.
#25
Nordschleife Master
Another one would be that if possible, make them compatible with the stock MAF housing in its stock location. I understand one could go Sharktuner alpha-N or aftermarket ECU, but the option to retain the stock MAF will expand the market quite a bit and make the whole project more likely to materialize.
#26
Official Bay Area Patriot
Fuse 24 Assassin
Rennlist Member
Fuse 24 Assassin
Rennlist Member
If keeping the stock system, one can also roll their own chips to tune the changes. Maybe Ken can educate some of us on how to do that.
#27
Developer
Can we please not put the ISV under the manifold?
On the other hand, once wired, the IAC is a never-touch item and has no hoses to or from it like the original does. No service necessary..
Also: if you are installing an after-market engine management at the same time, you may have no need for the IAC at all.
They are no longer needed.
#28
Official Bay Area Patriot
Fuse 24 Assassin
Rennlist Member
Fuse 24 Assassin
Rennlist Member
Andy, the IAC was mounted on the throttle body of the brand/and model we purchased, so that moved it out from under neath to the rear.
On the other hand, once wired, the IAC is a never-touch item and has no hoses to or from it like the original does. No service necessary..
Also: if you are installing an after-market engine management at the same time, you may have no need for the IAC at all.
They are no longer needed.
On the other hand, once wired, the IAC is a never-touch item and has no hoses to or from it like the original does. No service necessary..
Also: if you are installing an after-market engine management at the same time, you may have no need for the IAC at all.
They are no longer needed.
Ex - I live in CA, <The Butt Hole of the USA>. Stock S4 with an S300 EZK chip and x-pipe. If I want to add your intake and take it off every 2 years for smog, I will. However, are you going to offer tuning PROMs with the intake for stock applications? Both EZK and LH chips?
#29
Ross Machine Racing is currently manufacturing a full billet manifold as well as a throttle body adapter for stock manifolds to run a Mustang 90mm TB.
I will keep everyone posted.
I will keep everyone posted.
#30
Nordschleife Master
Interesting. Tell us more about the TB adapter to the stock intake manifold. Will it replicate the zip-tube tuning system?