Turbo 928s produced

Herr-Kuhn · 04:07 AM

I thought it would be interesting to list the number of Turbo 928s produced over the years. I know of the following:

1. 1979 model, single rajay built in California (I never got the guy's name but stumbled onto him while looking for injection options back in 2003)
2. Callaway 1, single Rajay, turbo, removed and Euro engine installed
3. Callaway 2, twin IHI, Intercooled, unknown location
4. Callaway 3, twin IHI, Intercooled, Kuhn owned since 1990, K-26 Upgrade, blah, blah, blah
5. Callaway 4, twin IHI, Intercooled, located in upstate New York
6. Callaway 5, twin IHI, Intercooled, resides in Florida, Kuhn upgraded fuel and intercooling systems
7. Kuhn 1, Twin turbo 1980 3-spd, K-24, Intercooled now resides in Tennessee
8. Kuhn 2, Twin turbo 5.0 liter 32V, GT2871R, blah, blah, blah
9. Don Berry twin turbo, T3 setup
11. Zoom Magazine TT 32V
12. Twin turbo, based out of Florida (I've forgotten this guys name)
13. Single turbo, based out of Florida (same as above)
14. Rumored 900 HP twin turbo Florida based race car
15. Robinson 1, 32V Single turbo, intercooled
16. Robinson 2 (Abby car), 32V single turbo, intercooled
17. Robinson 3... (how many out there Mark?)
18. P9 Rear Mount system

Are there more of them?

Some interesting history on my Callaway, it and the first other twin turbo car were built in exchange for some marketing services to two marketing executives out of Pittsburgh, PA back in 1983.

rhjames · rhjames's Garage

Mmm.......

Maybe the supercharger guys should publish their numbers as well?

Then the stroker guys.... then the nitrous guys....you can see where this can go.

Just a fun thought---

--Russ

Herr-Kuhn · 12-15-2007, 03:51 AM

Russ, that wasn't the point of this thread! It was just to show that there have been quite a few cars put together over the years.

Fabio421 · 04:54 AM

I have the name of the builder of the twin and single turbo cars that were built down near Miami. I'll try to dig up the name and post it here later John. I can't now. I have a TT 928s to tune

And what about that TT car I posted pics of awhile back. The one with the turbo's mounted on bacjwards manifolds and an A/C delete. The one with all the yellow engine parts. Is that one on your list? I'm not aware of the zoom magazine car. Maybe you could fill us in on what you know about these cars. That would be interesting, at least to me.

Red Baron · 12-15-2007, 04:58 AM

To make it real interesting we could then move to how many with side pipes and police interceptor badges.

Herr-Kuhn · 12-15-2007, 05:23 AM

There must be at least 25 cars out there then.

hacker-pschorr · 12-15-2007, 08:23 AM

This one from Sweden:
http://forums.rennlist.com/rennforums/showthread.php?t=225504

Another one in Europe:
http://www.jan-auto.dk/projekt-928.htm

I remember there being one in Australia

The one Fabio is talking about, isn't that in Kansas? I tried to do a search for it, came up short.

I also thought the rear mount crew had 2-3 cars together.

Mule · 12-15-2007, 08:43 AM

Quote:

Originally Posted by Red Baron

To make it real interesting we could then move to how many with side pipes and police interceptor badges.

No really, did somebody put side pipes & a police interceptor badge on a 928?

Does it have 24's and a cheese slicer wing too? You can see where this can go.

Red Baron · 12-15-2007, 09:03 AM

Quote:

Originally Posted by hacker-pschorr

This one from Sweden:
http://forums.rennlist.com/rennforums/showthread.php?t=225504

Another one in Europe:
http://www.jan-auto.dk/projekt-928.htm

Ah, classic rennlist **** talk thread.

We're either of those cars ever completed?

Herr-Kuhn · 12-15-2007, 06:10 PM

Thanks for posting those Erik...I think there are more as well.

Fabio421 · 12-15-2007, 06:33 PM

Yes, the one in Sweden is Gulpilen. He has a website dedicated to this build and another non turbo build here http://www.928turbo.se/index.htm The cars in Miami are Troy Ammons cars. He claims to have built three turbo 928's. I have pictures of one or two of them. I will try to dig up the specs.

Theres another Turbo car on Rennlist ( Not Mark R.'s first car) but the guy keeps a low profile. His name is Dave and he is in Boise Idaho. Just today anothet TT 928 OB surfaced in Atlanta. WTF, they are multiplying.

hacker-pschorr · 12-15-2007, 07:04 PM

Quote:

Originally Posted by Fabio421

they are multiplying.

Whatever you do, don't feed them after midnight!!!

Red Baron · 12-15-2007, 07:05 PM

Troy owns or built the cars you mention?

Fabio421 · 12-16-2007, 05:29 AM

Quote:

Originally Posted by Red Baron

Troy owns or built the cars you mention?

He owned them and built them. All past tense. The last time I spoke with hime he was finished playing with 928;s.

Herr-Kuhn · 05:39 AM

More like don't feed them high-test gasoline

421, I had forgotten about that Idaho car. That was a single turbo, non intercooled, talked with him a few times about it. BTA or BSA or something like that was the name of the builder. You have a lot of the early turbo stuff still going after 20 years, I think that is great.

One of the Troy cars had full headers and real low mounted T3s with remote wastegates, I don't think he intercooled those but remember hearing him say how fast the twin turbo car was.

Shane E · 12-16-2007, 08:30 AM

There is a twin turbo S4 in the Portland area. Got to see that one in person at a PacNW dyno day.

Fabio421 · 12-16-2007, 08:33 AM

Quote:

Originally Posted by Herr-Kuhn

More like don't feed them high-test gasoline

421, I had forgotten about that Idaho car. That was a single turbo, non intercooled, talked with him a few times about it. BTA or BSA or something like that was the name of the builder. You have a lot of the early turbo stuff still going after 20 years, I think that is great.

One of the Troy cars had full headers and real low mounted T3s with remote wastegates, I don't think he intercooled those but remember hearing him say how fast the twin turbo car was.

Heres that car and another he built with a single up front.

Here is a picture of a twin turbo in Australia. It is owned by a guy named Gordon and it is for sale. The asking price is 25k AU

Shane E · 12-16-2007, 08:43 AM

For those who can't view pics on rennlist:

Thread:
http://forums.rennlist.com/rennforums/showthread.php?t=204285&highlight=PacNW+Dyno+day

Fabio421 · 12-16-2007, 10:26 AM

Here is a summary of the impressions of the car shown above. The Pac NW twin turbo.

when I invited the builder to bring the car, he was forewarned that it was a public event and that pics would be taken of the car unless I was notified otherwise.

When a couple of us went to see the car awhile back, pics were taken similar to what you posted, together with the underside of the car while it was on the lift, and just about the entire build book (photo album of the engine/turbo system build) was scanned for a story in 928 Forum. We wanted full disclosure of the entire build for the article, but the builder got cold feet and pulled his authority to publish any of the material and requested that it all be deleted/destroyed. A little different situation there, as it was a private showing for the magazine.

I've been keeping him up to date with what's been happening in the boosted shark field, with the Murph kits, Andy's twin screw, and now the rear mounted turbo. I think seeing these budget conscious options becoming a reality for the 928 is softening him up a bit. I think he'll eventually come around and let us publish the story.

I don't know how relevant the build is from a cross application standard, this car is a one of a kind monster built in 1988 when there just wasn't the product to put together a throw together kit. It is a fully engineered system, not a drop in mod. All the same, there is a lot of engineering that went into this car that would be great for all to see.

The car was not performing up to snuff yesterday. It was built to run 17 psi boost, but was only running 7. To put some perspective on the age of the build, the reason it was only running seven psi boost is that one of the wastegate caps fragged while the car was out on the track and the spring was either damaged or ejected. He tried to find a replacement spring, but because the wastegates are so old they aren't made any more. He had to machine the replacement cap himself. So the car, which isn't an active project for him, went back to his home for another day when he'd have time to make some new springs.

When I called the builder to invite him to the dyno day, I didn't realize the car was out of commission. His assistant didn't tell me either, she just said that the car would be there. Apparently he had his shop scramble to get the car up and working (he only had about a week's notice) and the only springs he could find were the 7 lb.'ers. Running a car that has built for 17psi on 7psi isn't going to yield the best results. Although he attempted to dial out fuel, and eventually even took some of the sequential injectors offline, the car still couldn't make a totally clean run and was rich fouling in the higher rpms. Out of 5 or 6 pulls, he only took one to 6K, and the rest he had to bail out early, around 4.5K I believe.

So the TT is still kind of a question mark as far as peak performance, but the builder is definitely a 928 fan. He was very much enthused by the other 928's there, and had a good laugh when I told him about the Mark A./Joe F. recent win.

The rear turbo car did very well, but did not get a fully optimized run due to some fuel delivery issues. Probably be able to dial it in with the AFR and some more dyno time, but the developer of the kit needs to do some testing of the fuel delivery system under load first to make sure there aren't any issues with the pumps/fuel filter that might be impeding fuel delivery. Probably see a fully optimized run in the next 30 days I would think.

Definitely a great turn out, and lots of different 928's. I love the highly modded rigs, but I still think my favorites are the O.B.'s. It's rare to see one of these on the dyno, but when I do I feel like I'm transported back to some secret dyno lab in Stuttgart circa 1976'ish surrounded by a bunch of white-smocked german engineers all crowded around their latest creation, projekt 928, that first time on a chassis dyno. (Sure, I realize they probably only used engine dyno's, but it's my daydream, so get on board or at least keep quiet ). Hearing the sound of that 4.5L eagerly pushing to redline, roaring like a lion. It's true music to the ears.
__________________
Adam Birnbaum

Herr-Kuhn · 12-16-2007, 12:26 PM

I've seen that PNW car before. While it is interesting I'm not crazy about the layout with the charge coolers up top like that. Additionally the inlet to the cores is a right angle deal. I'm just not seeing how you could get air passed through those cores at all. As I recall it was K-26 based. I'd love to crawl under that thing to see any similaraties to my own 32V TT. I can honestly say my development was entirely "clean sheet", it shares nothing in common with anything Callaway or anybody else did.