Porsche 944+Chevy V8

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LouNY
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Post by LouNY »

She is keeping you busy, but she is looking good. Good work.


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Richard S.
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Post by Richard S. »

When you starting the build on the supercharged 3800 Fiero?

grumpy
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Post by grumpy »

Fiero, someone say Fiero ....

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StokerDon
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Post by StokerDon »

LouNY wrote: Sun. Jan. 07, 2024 9:56 am She is keeping you busy, but she is looking good. Good work.
Thanks!
Richard S. wrote: Tue. Jan. 09, 2024 9:46 pm When you starting the build on the supercharged 3800 Fiero?
That sounds like Grumpys project. We only work on old P cars and Crown Vic's here. :lol:

Right now the 'Ol 944 is running real good with no problems. I drove it to work on Friday in the freezing cold. The heat works great!

Once I'm convinced that the odometer is fixed I'll finish up the dash and put it back together permanent like.

-Don

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StokerDon
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Post by StokerDon »

TIME TO REVISIT THE CARBORETOR.

Although the MSD Atomic LS fuel injection system has worked well enough for 3 years now, There are a few things that limit our ability to tune it. We have been fighting with low speed running and throttle transition issues from the beginning.
20240714_100403.jpg

20240714_100403.jpg

I think the best direction to go is with a new Holley Terminator X system. Unfortunately, this is an expensive direction to go. After watching an episode of "Stay Tuned" where the guys decided to run a carb on an LS, I thought, "I have all the stuff to do that in the basement!".


I had to order a few fittings and hose clamps but we are pretty much ready to start. Well, once the garage cools down under 90 degrees. :?:
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Roll the video Son!

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Post by grumpy »

I hear a carb may add 10/15 HP and the Ls really likes them..

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Post by LouNY »

sounds good, enjoy


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StokerDon
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Post by StokerDon »

grumpy wrote: Sun. Jul. 14, 2024 7:37 pm I hear a carb may add 10/15 HP and the Ls really likes them..
LouNY wrote: Wed. Jul. 17, 2024 10:11 am sounds good, enjoy
Thanks Guys!

We are moving forward with the carb conversion.

Removed the MSD Atomic LS system.
Screenshot 2024-07-21 081320.png

Screenshot 2024-07-21 081320.png

Test fit the carb on it.
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20240719_190116.jpg

Now we know for sure that the carb and air filter won't fit under the hood. :x
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20240720_172101.jpg

20240720_172116.jpg

20240720_172116.jpg

Started working on the carb fuel system.

My plan is to run the stock FI fuel pump like we have been. Keep the return line and the FI bypass regulator. The main difference is we are going to tap off of the original high pressure line and feed that into the low pressure carb regulator.
20240720_134113.jpg

20240720_134113.jpg

If this all works like I think it should, we should be able to turn the high pressure line down to 20 to 25 PSI. This lower high pressure will feed the low pressure regulator and give us 5 or 6 PSI.

Here it is mocked up in the car.
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20240720_134046.jpg

We have to order the right size intake gaskets. The set I had laying around turned out to be larger and don't fit.
20240719_184116.jpg

20240719_184116.jpg

Roll the video!


And another!


Over the Winter, we will be looking into converting to the original GM ECU. Special thanks to Mike for making his point in the comments of the last video. His comments suggested that the GM ECU and air flow sensor setup would give better low speed and off idle performance.
Thanks Mike!

-Don

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Rob R.
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Post by Rob R. »

What is your plan for hood clearance?

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StokerDon
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Post by StokerDon »

Rob R. wrote: Sun. Jul. 21, 2024 9:13 am What is your plan for hood clearance?
A big hole in the spare hood. No way around it. Even without the air filter half of the carb will stick up through the hood. It's about 4 inches too tall.
20240720_172116.jpg

20240720_172116.jpg

I'm gunna try a cowl induction type add on.

-Don

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Hambden Bob
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Post by Hambden Bob »

What can possibly come next for "Miss Porsche"..?? Perhaps a Blower from a salvaged Axeman-Anderson..?? Stay tuned,literally for the next episode of the "Stoker Don Show"..!!

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Post by Rob R. »

StokerDon wrote: Sun. Jul. 21, 2024 7:03 pm A big hole in the spare hood. No way around it. Even without the air filter half of the carb will stick up through the hood. It's about 4 inches too tall.
20240720_172116.jpg
I'm gunna try a cowl induction type add on.

-Don
ok wow, I was thinking a low profile air cleaner might help but with that side view I see what you mean.

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StokerDon
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Post by StokerDon »

Carb Conversion Progress.

This weekend we nailed on the manifold and plumbed the fuel system.
IMG_0005.JPG

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Then we sorted out the throttle linkage.
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Spent yesterday afternoon wiring the MSD and the fuel pump with relays.
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IMG_0008.JPG

Then it was time to make the dreaded Hole in the Hood.
IMG_0007.JPG

IMG_0007.JPG

I don't like it but it didn't come out too bad.
IMG_0010.JPG

IMG_0010.JPG

Then it was time to test the fuel system. Unfortunately, we had a small leak. Turned out to be the pipe plug in the fuel manifold.
IMG_0009.JPG

IMG_0009.JPG

I tried to tighten it but its made of aluminum or some crap metal. The hex key just turned inside it. It was a small leak so we fired it up anyway just to make sure everything worked.



Today I removed the manifold and found that it was actually the hex key hole, not the threads that were leaking. :o :x
IMG_0001.JPG

IMG_0001.JPG

I temporarily put a Tee in it's place so we could go for a short ride. With the Tee, it is not maintaining 6 PSI at the carb, it drifts up to about 12 PSI. Not good. Gonna try fixing the plug in the manifold. It seemed to maintain 6 PSI with it.


-Don

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Hambden Bob
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Post by Hambden Bob »

In depth content in this report,Don..!! Yeah,You're all over this..!! Good Show..!!

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Post by StokerDon »

Thursday evening we got out the painters tape, Sharpie and the drill.

Then we sat the Harwood HAR-4104 hood scoop on and made measurements and markings.
IMG_0001.JPG

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Then we drilled all the holes, cut the stainless steel bolts to length and bolted it on for a test fit.
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IMG_0017.JPG

It was pretty tricky getting it in exactly the right place. It actually had to be mounted an inch or two forward to clear the front of the big air filter. Now it has to come off and be cleaned and painted.


In other news,
On Monday evening, after I fixed the leaking fuel manifold, I went for a 20+ mile ride. I was amazed how well it runs at very low RPM with the carb. It will easily putt around at 1200 RPM in First, Second, Third, Fourth and Fifth! :o It would never do that before.

But all is not well. Our fuel manifold dual pressure regulator setup is not able to keep pressure to the carb under 12 PSI. This is not good and eventually causes flooding.
20240720_134113.jpg

20240720_134113.jpg

I found the Aeromotive model 13220 which is a fuel injection to carb dual stage fuel pressure regulator. It will do the job but unfortunately, it ain't cheap. :?:
Aeromotive 13220.png

Aeromotive 13220.png

Luckily for me the guys at "Stay Tuned" put out a new video last night on the carbureted LS-1 for their C5 Vett. They used exactly the same regulator to solve the same problem. :up:


-Don


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