White Lightnin'

You're right Tuomo.... the eBay piece that Nicholas found is to update an early model to a late model appearance (also from A.I.R.) and won't work on your car...

Nicholbry

Ahhh, sorry.

ptuomov

Here's an update of what's going on with cooling in my car.

John fabbed these intercooler vents, which I think look pretty good on black car:



I am still researching alternative solutions for the intercooler vent, though, so keep the ideas coming.

Question: Does anyone have one of these Strosek bumper covers that they'd sell me?

http://www.motorbase.com/uploads/ccf...1231502110.jpg


Used or new, I'd be interested. Does anyone know if they are complete bolt on with the stock fenders and other components?

Some other thoughts on the air flow in the front. There's a firm that makes some 968 Turbo RS stuff that might be of interest the racers/ricers among us:

- The 968 Turbo RS hood vent, which could be installed on the 928 hood and used to vent out warm air from the radiator. This for the racers and ricers among us.



- The 968 Turbo RS NACA scoops, which could be to lower the underhood temperatures. This would make most sens for turbo cars where the underhood temps are more of a problem.

tv

That vent above by JK is the way I would go with the addition of the black chicken wire that so many cars use like the 599 gto.

ptuomov

Strosek is for sure responsive, although they don't make that nose anymore:

---

Dear Tuomo,

Thank you very much for your mail and your inquiry.

We are very sorry to inform you that your desired front section is no longer available.
Please find attached two pictures of our current front section for standard cars –
with original S4 lights or with Strosek lights.

Kindly let us know if you are interested in and we will make you a very special offer.

Hope to hearing from you again.

Best regards
Marita

9x8

These are very rare (and awesome looking, too!).
Also, in other pics it looks like they can be mounted only to early fenders (or, well, actually to fiberglass ones, but "the early way":
http://carphotos.cardomain.com/ride_...0001_large.jpg
http://www.autotuning.no/sitefiles/4...8Strosek_1.jpg

tommi nylund

I would take the three row vent front bumper (from your doctored pics) as a starting point, then saw the vents out of the bumper from their outer lines and then put in one large (!) front mount intercooler and try to hide it away as much as it is possible. (black paint, mesh, etc...)

Background for this is that I think you will have some serious intake air temperature issues with two small side mount ic's with the heat causing by turbochargers.

Or I would replace the side mount ic's with liquid cooled ones and place one large radiator (for the ic liquid) behind the front bumper, at center, and leave the bumper unmodified.

Btw, it's been nice to see your posts for the TT setup. Good work!

hans14914

V-Zweeden makes a very interesting S4 replacement fiberglass bumper. (They also make a very Strosek-eque front splitter).

http://dev.v-zweeden.com/product_inf...roducts_id=329

I think that the rigid fiberglass would be easier to modify for wider vents. Just a thought.

Hans

ptuomov

The air to air intercoolers have been tested on John's car for a while and they absolutely do work. I understand the skepticism since not all fender mounted intercooler setups work as well, but those massive 928 fender cavities are just about ideal.

Some of the photos understate the size of these things. They are much, much bigger than the bumper vent opening. The duct is set to expand at an angle, which will produce the best flow. On my 997 I believe the engine is mainly cooled with two fender mounted radiators in the same location, and those heat exchangers are smaller (although 997 has that front mounted center element as well so let me not overstate my case.)

I also checked the pressure differential between the fenderwell and the front bumper at 1... eh... 55 mph. I didn't get an accurate reading, but there was a pressure differential between the silicon hoses in the right direction that was obvious from just holding fingers on the hoses. There was a lot of excitement during the measurement process, "vauhtia ja vaarallisia tilanteita."

I am actually no longer worried about intercooling, other than perhaps to change the look of the car. My main concern now is the regualr engine cooling, oil and coolant. My car has an AC and no external oil cooler. I would like to get a lot more cool air flow to that nose section. Only after I get more flow does it make sense to add bigger and more heat exchangers.

Here's one idea for getting more flow, mentioned above. Cutting a 968 Turbo RS style duct in the nose. On 928 Turbo RS it feeds the intercooler, in my car it would feed the air intakes and the radiator:



It's all John Kuhn's work so far. I've had some design input into it, but it's his system and he's installing it. He's done a couple of test runs on the road with the car and making a couple adjustment now. The new safe, detuned baseline dyno graph should be out in about a week, from which my more time consuming tuning work and durability testing can begin.

tommi nylund

Ofcourse it will depend about what kind of power figures you are aiming to... For 550hp at rear wheels I don't see any problem, but I would like to see more...

Yes, I noticed that you have done the duct to ic's by the book -> angle opening up towards the ic's. So I believe it's been done as good as it can be without 'over engineering' it....

External oilcooler should not be a big thing? Even the factory have put one in some cars which Erkka can tell you more about... So that might get the work done there, or get some good known aftermarket oilcooler. I think you should have one, because the turbos will heat the oil up for sure.

The AC core before the engine heat exchanger should not be a problem. Just don't forget the fans behind the radiator. They have to move a lot of air! And then you need to get that air out of the engine bay. So you need to put a bonnet vent and keep the rear edge of the bonnet sealed tight.

So to get back to original question, I would add one row of those original bumper vents and then create something 968 Turbo RS style between the lights in bumper.

Keep up the good work, it's so nice to see finally a proper turbocharged 928! And the kit seen from John's site looks very nice!
I'm waiting for that not-safe-tune so hard!

ptuomov

The current plan is to add the '90 factory external oil cooler but with rather non-standard routing and flow direction.

I am probably not going to do a bonnet vent. I am not "feeling it" in terms of this car, it just seems that it's better with a more understated look. Instead, I am trying to force the air to flow by the exhaust manifolds under the car. Let's see if I am successful.

Sealing the rear edge of the hood is a good idea, since that's a high pressure zone.

The fans help a lot at low speeds but they hurt at high speeds. They hurt both the cooling and the aerodynamics. So the fans will never be the complete answer.

It's John's work so far, the credit belongs to that direction.

That will have to wait until for a little bit. But it's coming.

Tony

Those look better on a black car, but is there anyway you can secure that grille in place without those screws? Just ruins it.

ptuomov

Working on it...

hacker-pschorr

Gee, I received hate mail for making such a suggestion a few years ago. Funny how times change.....

I would have gone with some kind of duct / funnel looking device.

Just a quick Google search:











Or something along these lines:

ptuomov

Did you make the suggestion in a polite and constructive manner? ;-)

Sure there's always a better way to do it if you throw more money at it -- which is precisely what I am considering doing.

I haven't found anything off the shelf that both fits and looks more factory on a black car than what John's done. If you can find a piece with the right dimensions, I am interested.

I have an idea about what the vent should look like but the aluminum mold for making a bunch of them costs $6000 so it's not in the cards, unless you want to buy 99 pairs of bumper vents from me at $65 per pair! (The variable cost would be about $5).

In other words, I am very happy with how the black car now looks since... but still looking.