Converting to Carburetor ? Holley vs. Malpassi
09-20-05, 11:55 AM
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Converting to Carburetor ? Holley vs. Malpassi
I recently converted my fuel injected S5 Motor in my S4 1988 RX7 Convertible to a 600 CFM Street/Strip Holley Carb.
I wanted to go with a Weber 44 or 48 IDA Sidedraft setup since there is more power to be gained above Stock Fuel Injection. This was a suggestion by Carlos Lopez of CLR Motorsports Miami.. I was desperate to get my ride back on the road so i opted for a transitory option in the meantime. Charlie of Turbo Clinic suggested a Holley Carb and I wish I would have waited for the Weber.
My girlfriend hates the fumes and odor that the Holley puts out.. also I have noticed that the Holley is a good carb for straight aways but not for cornering or curves. The odor with the Holley is quite pungent.
The Weber setup eliminates any bogging on turns, slopes, hard cornering and curves.. it's actually an all around better option for the FC. Back in the early 80's I used to race a 1969 VW Beetle in NY that had 48 IDA webers, a Hot camshaft, and other goodies and was doing 10.69 in the quarter.
When it came to the fuel pump and fuel pressure regulator argument. Here are the pros and cons..
Normally one would think that going with a Holley Carb setup would require that you replace the stock fuel injected fuel pump that creates more pressure close to 40 psi because at that rate it will blow out the gasket in the float bowl. It happened to me and Charlie's mechanics came out to rescue me and Jonathan along with Steve did a great job of getting me back on the road. Charlie had the Holley fuel pressure regulator P/N 12-803 which i paid $33.00 separately for out to its maximum adjusting position. Keep in mind that i am using the stock fuel injected fuel pump that came with my vert. His suggestion was to purchase the Holley "Blue" fuel pump P/N 12-812-1 for the low price of $120.00 and another $80.00 in labor to hook it up. I also had a liquid filler Russell Fuel Pressure gauge $24.00 installed with my Holley setup that unfortunately is on there for looks because it doesnt register anything at all as you will soon find out as you read on.
Carlos Lopez had a solution for me that would eliminate the problem without having to replace the fuel pump which would be expensive at this point in the game. I gotta tell you that this man knows his **** really well dealing with RX7's and Rotary Technology. He suggested replacing the Russell fuel pressure gauge since it was not registering or reading. One way he came to that conclusion is to attach a tool that he has to correctly adjust fuel pressure that is made of an older version VDO gauge and fuel lines attached to it. Then what he did next was to remove the Holley Fuel Pressure regulator and its place install a Malpassi (Made in Italy) Fuel Pressure Regulator that is shaped like a flying saucer and with his gauge he was able to set the pressure at 6psi. I was able to keep the same stock fuel injected pump that came with my vert. Another person that was in agreement with this setup is Dennis DeSilva "RPM Doctor" forum name of High Tech Auto. Carlos got my new reborn FC Convertible "Jezebel" running right... all we had to do is just use the Malpassi fuel pressure regulator that retails for about $85.00 or so.
All in all I made out pretty well and it goes to prove to the old saying: "You get what you pay for "
Carlos Lopez is a genius at what he does best and this man has a world of knowledge and in the next couple of weeks I will be getting the Weber 48 IDA Carburetor and Manifold from Racing Beat. The Holley carb is a good setup and its simple to actually do the conversion so I will have the Holley Carb up for sale within the next couple of weeks as I will be going with the Weber setup that Carlos Lopez suggested to begin with. I will also be going with a single turbo setup and he will be the person to build this motor together.
Getting back to the original topic of this thread..
Malpassi Vs. Holley
I recommend using the Malpassi Fuel Pressure Regulator instead of the Holley. This is an older pic before I had the Malpassi Installed .. I will update this pic that will show the stainless steel braided lines and of course the Malpassi fuel pressure regulator. This is pic is just to give you an idea as to what the conversion looks like.. this Holley Carb and manifold set up will be up for sale soon. I expect to get what i paid for .. this system was installed just last week so it is still relatively new.
I wanted to go with a Weber 44 or 48 IDA Sidedraft setup since there is more power to be gained above Stock Fuel Injection. This was a suggestion by Carlos Lopez of CLR Motorsports Miami.. I was desperate to get my ride back on the road so i opted for a transitory option in the meantime. Charlie of Turbo Clinic suggested a Holley Carb and I wish I would have waited for the Weber.
My girlfriend hates the fumes and odor that the Holley puts out.. also I have noticed that the Holley is a good carb for straight aways but not for cornering or curves. The odor with the Holley is quite pungent.
The Weber setup eliminates any bogging on turns, slopes, hard cornering and curves.. it's actually an all around better option for the FC. Back in the early 80's I used to race a 1969 VW Beetle in NY that had 48 IDA webers, a Hot camshaft, and other goodies and was doing 10.69 in the quarter.
When it came to the fuel pump and fuel pressure regulator argument. Here are the pros and cons..
Normally one would think that going with a Holley Carb setup would require that you replace the stock fuel injected fuel pump that creates more pressure close to 40 psi because at that rate it will blow out the gasket in the float bowl. It happened to me and Charlie's mechanics came out to rescue me and Jonathan along with Steve did a great job of getting me back on the road. Charlie had the Holley fuel pressure regulator P/N 12-803 which i paid $33.00 separately for out to its maximum adjusting position. Keep in mind that i am using the stock fuel injected fuel pump that came with my vert. His suggestion was to purchase the Holley "Blue" fuel pump P/N 12-812-1 for the low price of $120.00 and another $80.00 in labor to hook it up. I also had a liquid filler Russell Fuel Pressure gauge $24.00 installed with my Holley setup that unfortunately is on there for looks because it doesnt register anything at all as you will soon find out as you read on.
Carlos Lopez had a solution for me that would eliminate the problem without having to replace the fuel pump which would be expensive at this point in the game. I gotta tell you that this man knows his **** really well dealing with RX7's and Rotary Technology. He suggested replacing the Russell fuel pressure gauge since it was not registering or reading. One way he came to that conclusion is to attach a tool that he has to correctly adjust fuel pressure that is made of an older version VDO gauge and fuel lines attached to it. Then what he did next was to remove the Holley Fuel Pressure regulator and its place install a Malpassi (Made in Italy) Fuel Pressure Regulator that is shaped like a flying saucer and with his gauge he was able to set the pressure at 6psi. I was able to keep the same stock fuel injected pump that came with my vert. Another person that was in agreement with this setup is Dennis DeSilva "RPM Doctor" forum name of High Tech Auto. Carlos got my new reborn FC Convertible "Jezebel" running right... all we had to do is just use the Malpassi fuel pressure regulator that retails for about $85.00 or so.
All in all I made out pretty well and it goes to prove to the old saying: "You get what you pay for "
Carlos Lopez is a genius at what he does best and this man has a world of knowledge and in the next couple of weeks I will be getting the Weber 48 IDA Carburetor and Manifold from Racing Beat. The Holley carb is a good setup and its simple to actually do the conversion so I will have the Holley Carb up for sale within the next couple of weeks as I will be going with the Weber setup that Carlos Lopez suggested to begin with. I will also be going with a single turbo setup and he will be the person to build this motor together.
Getting back to the original topic of this thread..
Malpassi Vs. Holley
I recommend using the Malpassi Fuel Pressure Regulator instead of the Holley. This is an older pic before I had the Malpassi Installed .. I will update this pic that will show the stainless steel braided lines and of course the Malpassi fuel pressure regulator. This is pic is just to give you an idea as to what the conversion looks like.. this Holley Carb and manifold set up will be up for sale soon. I expect to get what i paid for .. this system was installed just last week so it is still relatively new.
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