PorKen

It would be nice to have just an aluminum cap with an o-ring channel!

I don't plan on putting scrubbers or anything under the cap, just a deflector. I think too much stuff in the engine slows the venting, plus, I'd like to be able to drain back through the same hose. I'd like to fit a largish chamber that would mount above the fan bracket to do the separation.



I'm pretty happy with the power that my '85 makes now. The dyno graph doesn't really tell you how it drives. I didn't think that I would even make much more than peak X-pipe power on the dyno, because of the S's valve size, and there isn't a whole lot of adjustment to the WOT curve. It's nice that it does, but I was more concerned about driveability, which it now has in spades. Plus, it will pull hard even in the wrong gear, so I'm not so stressed to be always at the right rpm, now that it's sportbike season again.

PorKen

It may be a coincidence, but look how the torque graph seems to match the MAP graph. I think the torque flattens out because there just isn't any more air, there. (Also note injector duty to HP.)


Note the S3 intake creates three distinct harmonic peaks at roughly 2700, 4300, and 5200 rpm. (You can see these better on the before dyno run.)

Darklands

I´m really impressed how smooth the last curve is.Is this one effect off the last code?The before plot is very rough.
Bigger tb are in 911 circles a good solution for more power in the topend.But the cars are louder with bigger tb and noise makes fast!

Btw,my S3 has 3 harmonics in the exhausttone: BRRR at 2000 ,BAAAH at 4000 and BAAAHHAAAA at 6000 rpm. ;-)

mark kibort

That is quite amazing. So, what does the higher compression of the S4, and larger valves do to the equation?? Some will say that the chips dont do anything for the S4 (or those changes to mixture and timing), But what are the gains due to? Is the S3 intake, that some of us think will work better on an S4? Certainly the cams are better with the S3!

That is what the holbert car was running after 7 full racing seasons . ( 330ish rwhp down to about 315rwhp when it was pulled for the stroker)

svp928

Hard to say, Mark. S3 compression is supposed to be around 10:1- similar to S4. Ken is seeing a pressure drop in the manifold at high rpm, so the valves are not yet an issue- the restriction is ahead of them somewhere. Obviously, there is more power on the table in the S3 if that restriction can be found....then the S3 will prove to be an even MORE superior engine compared to the lame S4.... hehehe

Rick Carter

IIRC this is from Swaybar:

Landseer

They're here! Chips are here!

They came in two little round fliptop containers.

Wife asks, "Is one for chips, the other one for earplugs?"
(yeah, for when your screaming in the passenger seat)

Cosmo Kramer

Wow good work Ken. I am amazed how much you are getting out of the 85 - 86 cars. You are pushing GTS horsepower numbers!

F451

I want my '85 back...

Mike Frye

Correction: beating stock GTS hp numbers. When Anthony (Cobalt) dyno'd his stock GTS (admittedly in need of a tune-up) he was under 300hp at the wheels.

The '85 is much lighter than a GTS too.

Darklands

Here´s a picture of my 80 mm S 2 tb with the S 3 linkage!

Tommorrow I will start the assembly of the intake.

PorKen

I think the throttle body is going to be the restriction. (Just have to collect all those 80mm S2 TBs that were installed on 4.5L 16Vs a while back. )

The airbox lid and tubes are not the restriction. Same MAP graph with the lid removed. (It's certainly louder, if you like that sort of thing! I don't think it would pass TÜV. )

I will try a K&N I have somewhere here, but that's about it for the easy fixes!

svp928

Ken, I ran my car a long time ago with and without the air filter, on a Dyno-jet....266 hp with filter and lid,
260 without filter and lid. Back-to-back, put filter and lid back on, 266 again.... Seems the filter/airbox assy is better than open with no filter....
I see you are also sans fan and airpump- do you have an elec fan to replace the stock belt-driven one?

PorKen

I did the same a while back, and gained some HP with the lid off. Looking at the AFRs, it appeared that taking the lid off leaned out the stock rich fueling at high rpm.

Taking the filter off changes the idle. I reckon the airflow becomes more turbulent through the MAF. Probably not good.



I've been using the stock A/C fan without issue, even in (PacNW) summertime heat. I was only going to do that for a short time, but although the temp will rise to below the 3/4 mark in traffic, it doesn't go any higher. I have a dual temp VW rad switch which would lower the fan on point, which I need to install.

For my '86.5 which has A/C, I have a SPAL dual fan to go in, once I fix one of the A/C hoses.



Looking at the engine pic, I'm reminded that I need to get a '86 right cam cover. Mine is a late '85, with a '86 type left and center cover (the easier to remove type), and a leftover '85 right. As you can see, the vent tube was moved forward so you can see the '86 type cam gear front notch through the vent tube.

Richter12x2

Do you recall which VW the temp switch came from? I've been thinking about swapping in the 3.8L '93 Taurus electric fan in place of the belt driven fan (especially now that the x-pipe is on, so that I can get rid of the airpump). It's a two stage fan that you can find everywhere, I've got to check but looks like the perfect size, and flows something like 3,000 cfm low speed and 4,000 cfm on high. Should be just the thing for the Texas heat!