48 Dellorto + Eaton M90 tuning help
08-10-12, 05:40 AM
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48 Dellorto + Eaton M90 tuning help
Hello,
I've not been on here for a while. I have sold the FD's and have a classic british sports car now runnign a 12a + Dellorto + Eaton M90.
I need some help. I am going to borrow a wideband and see what is going on but I know it's running rich as it stinks
I am running 1-100 premix, Facet Redtop fuel pump and Filter King fuel filter/pressure regulator with fuel pressure gauge.
I've read somewhere that the base pressure should be 3 - 3.5 psi and the screw 2.5 - 3 turns (but didnt say clock or anti clock) for a n/a 12a.
Might just sell the supercharger and set it up n/a but I have no idea on the internals of the carb. I was told it was the Racing Beat one, so assuming it's all standard inside.
Any help?
thanks.
I've not been on here for a while. I have sold the FD's and have a classic british sports car now runnign a 12a + Dellorto + Eaton M90.
I need some help. I am going to borrow a wideband and see what is going on but I know it's running rich as it stinks
I am running 1-100 premix, Facet Redtop fuel pump and Filter King fuel filter/pressure regulator with fuel pressure gauge.I've read somewhere that the base pressure should be 3 - 3.5 psi and the screw 2.5 - 3 turns (but didnt say clock or anti clock) for a n/a 12a.
Might just sell the supercharger and set it up n/a but I have no idea on the internals of the carb. I was told it was the Racing Beat one, so assuming it's all standard inside.
Any help?
thanks.
08-10-12, 07:57 AM
#2
Waffles - hmmm good
iTrader: (1)
Actually a NA Dell can only tolerate about 2.5 psi. Over 3 is going to cause rich running.
We need more info about the setup. Is it draw thru or blow thru? Whats the ignition setup?
Is the fuel pressure regulated by vacuum at all?
The idle air mix screws are usually about 2.5 turns out which would be anit-clock in british
terms
I assume you bought it with the eaton already installed. The previous owner maybe has it
setup rich to avoid detonation under boost.
Posting pictures will help too! I've always thought about using an Eaton as they are easy to
your hands on because their used in a number of domestic SC applications here.
We need more info about the setup. Is it draw thru or blow thru? Whats the ignition setup?
Is the fuel pressure regulated by vacuum at all?
The idle air mix screws are usually about 2.5 turns out which would be anit-clock in british
terms
I assume you bought it with the eaton already installed. The previous owner maybe has it
setup rich to avoid detonation under boost.
Posting pictures will help too! I've always thought about using an Eaton as they are easy to
your hands on because their used in a number of domestic SC applications here.
08-10-12, 08:49 AM
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Actually a NA Dell can only tolerate about 2.5 psi. Over 3 is going to cause rich running.
We need more info about the setup. Is it draw thru or blow thru? Whats the ignition setup?
Is the fuel pressure regulated by vacuum at all?
The idle air mix screws are usually about 2.5 turns out which would be anit-clock in british
terms
I assume you bought it with the eaton already installed. The previous owner maybe has it
setup rich to avoid detonation under boost.
Posting pictures will help too! I've always thought about using an Eaton as they are easy to
your hands on because their used in a number of domestic SC applications here.
We need more info about the setup. Is it draw thru or blow thru? Whats the ignition setup?
Is the fuel pressure regulated by vacuum at all?
The idle air mix screws are usually about 2.5 turns out which would be anit-clock in british
terms
I assume you bought it with the eaton already installed. The previous owner maybe has it
setup rich to avoid detonation under boost.
Posting pictures will help too! I've always thought about using an Eaton as they are easy to
your hands on because their used in a number of domestic SC applications here.
Tons of pictures.
Last edited by Gaijin samurai; 08-10-12 at 08:51 AM. Reason: replace blurred pic
08-10-12, 09:41 AM
#6
Waffles - hmmm good
iTrader: (1)
I'd like to see almost top down on the Dell and Eaton setup. Definitely looks like a drawthru.
When you get that wideband you need to make sure under full boost its running rich enough
so you don't get detonation. If you can do it on a dyno or road test.
When you get that wideband you need to make sure under full boost its running rich enough
so you don't get detonation. If you can do it on a dyno or road test.
08-10-12, 09:44 AM
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08-10-12, 06:21 PM
#9
I have a Dellorto setup in a 87 TurboII model RX7 on the stock S4 motor.... Right now it is N/A but from the searching I've done so far to go blowthru I've come across this from Robert @ Rotary Shack in a older thread:
"The Dellorto works great & w/my turbo plenum, the velocity stacks are eliminated as well as new jet covers being fabbed up to seal the carb. Once the carb is tuned you leave it alone. The settings don't change. People usually have other problems ie: bad spark, etc and start messing w/the carb instead of fixing the root problem."
I haven't gotten my hands into my own project yet so I can't offer any first hand experience.
"The Dellorto works great & w/my turbo plenum, the velocity stacks are eliminated as well as new jet covers being fabbed up to seal the carb. Once the carb is tuned you leave it alone. The settings don't change. People usually have other problems ie: bad spark, etc and start messing w/the carb instead of fixing the root problem."
I haven't gotten my hands into my own project yet so I can't offer any first hand experience.
08-12-12, 11:16 AM
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09-26-12, 06:40 PM
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omfg!!!!!!!!!!!!!!!! this is truly the most badass thing i have seen lately. im building a 4 port bridge port for a dd/ autocrosser and im planning to add a weber. i have given so much thought in the past about a supercharger and one day i want to do it. i hadn't given any thought to a draw through system which seems like it would solve all of the downsides i have came up with.
not to pry, but any idea on how much boost it's cranking out? any porting work? i must know more about this please
not to pry, but any idea on how much boost it's cranking out? any porting work? i must know more about this please
09-27-12, 03:22 AM
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omfg!!!!!!!!!!!!!!!! this is truly the most badass thing i have seen lately. im building a 4 port bridge port for a dd/ autocrosser and im planning to add a weber. i have given so much thought in the past about a supercharger and one day i want to do it. i hadn't given any thought to a draw through system which seems like it would solve all of the downsides i have came up with.
not to pry, but any idea on how much boost it's cranking out? any porting work? i must know more about this please
not to pry, but any idea on how much boost it's cranking out? any porting work? i must know more about this please
Boost is 08bar it's it's a stock port 12a
It is a lot of fun, it's running much better now and I've done about 100 road miles in it. If you want to know more fire away and I'll try my best to answer.
09-27-12, 12:29 PM
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is that .8 or .08 bar of boost? i ask because it looks like .08 which would be less than 2 psi, ut .8 is about 11 psi....hmm.
hows the power curve on that thing and when does it run out of breath? does it pull all the way to 7k (8k?) i've thought about a supercharger many many times, but the setup i always thought of was blow through not draw through and when you engine flows air quicker then the manifold can build pressure you end up with a 16psi pulley putting down 4 psi boost to the engine. with the draw through set up, it is pulling the air into the engine instead of trying to compress it before the throttle body. hmm....i would love to see a dyno chart. great looking set up sir. hats off to you!
hows the power curve on that thing and when does it run out of breath? does it pull all the way to 7k (8k?) i've thought about a supercharger many many times, but the setup i always thought of was blow through not draw through and when you engine flows air quicker then the manifold can build pressure you end up with a 16psi pulley putting down 4 psi boost to the engine. with the draw through set up, it is pulling the air into the engine instead of trying to compress it before the throttle body. hmm....i would love to see a dyno chart. great looking set up sir. hats off to you!
09-27-12, 01:03 PM
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I didn't build the car, it's exactly how I purchased it.
is that .8 or .08 bar of boost? i ask because it looks like .08 which would be less than 2 psi, ut .8 is about 11 psi....hmm.
hows the power curve on that thing and when does it run out of breath? does it pull all the way to 7k (8k?) i've thought about a supercharger many many times, but the setup i always thought of was blow through not draw through and when you engine flows air quicker then the manifold can build pressure you end up with a 16psi pulley putting down 4 psi boost to the engine. with the draw through set up, it is pulling the air into the engine instead of trying to compress it before the throttle body. hmm....i would love to see a dyno chart. great looking set up sir. hats off to you!
hows the power curve on that thing and when does it run out of breath? does it pull all the way to 7k (8k?) i've thought about a supercharger many many times, but the setup i always thought of was blow through not draw through and when you engine flows air quicker then the manifold can build pressure you end up with a 16psi pulley putting down 4 psi boost to the engine. with the draw through set up, it is pulling the air into the engine instead of trying to compress it before the throttle body. hmm....i would love to see a dyno chart. great looking set up sir. hats off to you!
I need some time on the dyne with a wideband and screwdriver to set it up but I am running out of time as I am moving to Chamonix, France in a few weeks. The car will be garaged in England until I decide what to do with it
09-28-12, 10:22 AM
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11 psi is pretty damn good for a supercharger set up with a linear powerband. im loving the idea. hopefully in the next few months it can get a wideband o2 and some dyno time . i've never seen such a set up before so i am very impressed and excited about it. please keep us posted on it, or better yet. start a thread on it when you actually start playing with it please
. i've never seen such a set up before so i am very impressed and excited about it. please keep us posted on it, or better yet. start a thread on it when you actually start playing with it please
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