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Old 12-11-2005, 01:37 PM   #61
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Jim,
I first unwrapped the Autorotor today. It was stamped 422 on the side. Being of razor sharp inteeligence, I quickly surmised that I probably have a 422 system. I did an upgrade to the larger intercooler. Assuming there is a 424 Autorotor, what is the difference?
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Old 12-11-2005, 01:44 PM   #62
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2.2 liter displacement vs 2.4 liter.
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Old 12-11-2005, 01:47 PM   #63
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Brian, well it’s starting to look like one set of tires isn’t going to do it for all occasions. I have two sets of tires and wheels for my daily driver (winter, summer) so why not for this car as well? Woody gave me some good advice on tires that work for him. Info is on my other computer so will let you know when I get there.
Brian, have you given any thought to Solo 1 and Solo 2 racing? There is a Porsche club in Edmonton who race at the military base just north of Edmonton. Check out there web site if your interested. Google Edmonton Porsche club. I think its time they were introduced to the new and improved 928.
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Old 12-11-2005, 02:02 PM   #64
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Lex,

What Shane said. The 424 was redesigned early this year which made it about 3/8" shorter. I guess I have the only one. I am trying to get Andy to guarantee the snout won't touch my hood if I have new motor mounts but am not having much luck...
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Old 12-11-2005, 02:09 PM   #65
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It's all good.
I was surprised how fast I hit the limiter in 1st and 2nd, scared the crap out of me. I could get good launches with if i was a bit careful. I was very happy with my Toyo T1S's. A little more $ but good in the wet, good wear and sticky to boot.

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Just a side story. Just a few days after I got my car sorted out I took it to the street legal drags. My son and I used to race a car there so no big deal. I really had never floored the car off the line before but put it through just about every thing else. Andy had coached me on how I should drive the car. I pulled up to the start line and could feel the adrenine start to pump. Everything I was supposed to do as far as launching the car went right out the window. I hammered the gas hard and went for second at red line. The car hit second and the rear moved out to the left. I let off the gas to straighten her out and floored it again while looking in my mirror. I couldn’t believe the tire smoke behind me. All of a sudden the engine is missing. Oh S—t hit the rev limiter. Time for third. My time was just under 14.5. I feel confident that I can get into the mid 12s with the proper setup and good air. I was pretty red faced after that run but the car did draw a lot of attention from other racers out there
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Old 12-11-2005, 02:42 PM   #66
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Does it make any practical difference (that extra .2 litres)? I tend to almost always overbuild (for the future) but usually never need it. Also doesn't the 928 Specialist SC kit use a newer, shorter, Autorotor? It might be that redesigned 424 Autorotor, which may come in handy if you decided to "crossover" in the future.
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Old 12-11-2005, 02:51 PM   #67
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The 424 is supposed to be good for an additional 30HP

The 422 stystem from Andy is supposed to be good for 800chp.

DR's is supposed to be good for 600chp.

Maybe DR can jump in here. I think he gave up some hp but gained some room and cleaned things up nicely (understatement).
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Old 12-11-2005, 03:00 PM   #68
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I think DR's is the 1.7 liter.
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Old 12-11-2005, 04:04 PM   #69
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Sounds like its more than enough for my purposes. I've got a Whipple I'm putting on Ebay as soon as I get it sorted out. It has the body of a 2300AX (2.3 litre) but has a different case front. I'm waiting for them to get back to me with answers before I list it, but if anyone here is interested, PM me and I'll let you know whats going on.
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Old 12-11-2005, 04:04 PM   #70
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I have been looking at the Supermodel kit laying on my basement floor, getting a bit excited to get at the install. All of this experitse and experience coalesing on this thread might just be the source of extra courage I need to attack my new '87 S4.

I have a few questions about the kit differences between the" '86 S" kit variant which was how Andy configured the kit.... for a previous car.

Andy told me that I needed to get the "S" throttle body.... which I did.
I now suspect that I need the "S" Fuel Pressure Regulator as well??
Do I still use the M-9593-B-302 #30 injectors that I got from Summit Racing for the "S" installation?

Also, There was some conversation elsewhere about the induction system gaskets. What I have appears to be made from 1/8" thick cork. Is this the right/final material for these gaskets, or do I need to start hunting for something else?
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Old 12-11-2005, 04:05 PM   #71
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Quote:
Originally Posted by Jim_H
Lex,

What Shane said. The 424 was redesigned early this year which made it about 3/8" shorter. I guess I have the only one. I am trying to get Andy to guarantee the snout won't touch my hood if I have new motor mounts but am not having much luck...
I'm sure that if he sold it to you, it would fit. Andy knows the dimensions under the hood of a 928 better than anyone else. When he designed a GTS prototype kit (from scratch), he didn't even need to look at any of his previous drawings. He just started drawing it in cad. When the manifold arrived and we installed it for the first time, all we had to do was shave a couple mills off a corner and it fit right in.
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Old 12-11-2005, 04:06 PM   #72
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If you have an 85/86 and use 30# injectors, then using the 85/86 regulators will lower the fuel pressure to give you a better idle.


Quote:
Originally Posted by BrianG
I have been looking at the Supermodel kit laying on my basement floor, getting a bit excited to get at the install. All of this experitse and experience coalesing on this thread might just be the source of extra courage I need to attack my new '87 S4.

I have a few questions about the kit differences between the" '86 S" kit variant which was how Andy configured the kit.... for a previous car.

Andy told me that I needed to get the "S" throttle body.... which I did.
I now suspect that I need the "S" Fuel Pressure Regulator as well??
Do I still use the M-9593-B-302 #30 injectors that I got from Summit Racing for the "S" installation?

Also, There was some conversation elsewhere about the induction system gaskets. What I have appears to be made from 1/8" thick cork. Is this the right/final material for these gaskets, or do I need to start hunting for something else?
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Old 12-11-2005, 05:03 PM   #73
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Hi Mike,

I appreciate your dedication to Andy.
If it will fit Andy won't have any problem with a guarantee that it will. I think he got a bit nervous when I mentioned new motor mounts.
I don't think I am being unreasonable.


Quote:
Originally Posted by mspiegle
I'm sure that if he sold it to you, it would fit. Andy knows the dimensions under the hood of a 928 better than anyone else. When he designed a GTS prototype kit (from scratch), he didn't even need to look at any of his previous drawings. He just started drawing it in cad. When the manifold arrived and we installed it for the first time, all we had to do was shave a couple mills off a corner and it fit right in.
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Old 12-11-2005, 05:14 PM   #74
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Mike,
Brian started out with an 86 928 and was going to supercharge it using the Autorotor SC. He sold that car and now has an 87 S-4. I have an 88 S-4 with the Eaton SC and on Andy’s advice I am using an 85-86 FPR. It appears to be working perfectly. Should Brian use the same FPR as I am or should he use the BEGR that was to be originally used? He is using the same #30 injectors as I am.

Mike can you clarify if these are the right intake/manifold gaskets?

Also, There was some conversation elsewhere about the induction system gaskets. What I have appears to be made from 1/8" thick cork. Is this the right/final material for these gaskets, or do I need to start hunting for something else?
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Old 12-11-2005, 05:22 PM   #75
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Jim,
What size tire and wheel are you using at the back?
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