After market distibutor
Instructor
Joined: Mar 2007
Posts: 173
Likes: 18
From: Edinburgh Midlothian
Safety Car
Joined: May 2001
Posts: 4,759
Likes: 1,647
From: Fairfax Virginia
I "Second" the Davis DUI system! I have used their distributors with great success in the past and I am using one of their distributors on my 1988 C4. It was plug and play for my installation.
They make great products and set them up properly for your application. A quality company with a Reputation to maintain will not let you down as often as others.
The modern MSD replacements have been going down hill from what I have heard. A Speed shop owner took my MSD Billet distributor and tried to help get it dialed in for my application using an old SUN brand Distributor machine
Best regards,
Chris
They make great products and set them up properly for your application. A quality company with a Reputation to maintain will not let you down as often as others.
The modern MSD replacements have been going down hill from what I have heard. A Speed shop owner took my MSD Billet distributor and tried to help get it dialed in for my application using an old SUN brand Distributor machine
Best regards,
Chris
Le Mans Master
Joined: Oct 2007
Posts: 9,700
Likes: 3,469
From: Akron Ohio
2025 Corvette of the Year Finalist - Modified
2024 C5 of the Year Winner - Modified
2023 C5 of the Year Finalist - Modified
2022 C5 of the Year Finalist - Modified
St. Jude Donor '09-'10-'11
Le Mans Master
Joined: Feb 2005
Posts: 6,485
Likes: 566
From: Clearwater Florida
….. I used the MSD Small Cap HEI EFI distributor for years … never an issue … in fact , its still on the shelf in the event that I decide to go analog on spark distribution again … currently running Holley ECU with coil near plug (LSx style) and FAST dual synch distributor …..
Le Mans Master
Joined: Aug 2007
Posts: 8,735
Likes: 412
From: WV
DUI makes good distributors but they have to be shimmed to be right..When I got mine it was at 0.045 which is way to much , I shimmed it to 0.015 , this is where it's suppose to be..If you buy a DUI distributor be sure to get a shim kit with it....WW.
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Last edited by WW7; Nov 7, 2019 at 08:54 AM.
Pro
Joined: Aug 2011
Posts: 506
Likes: 57
From: New York
Pm me if your interested.
Thanks
Matt
Drifting
Joined: Feb 2013
Posts: 1,464
Likes: 48
C409,
Did the new distributor give you a measurable change i.e. HP, economy, etc. Just wondering. Every time I see something like a different distributor etc. The product literature makes claims. I just wonder if anyone has seen the claims in a measurable parameter.
Thank you
Did the new distributor give you a measurable change i.e. HP, economy, etc. Just wondering. Every time I see something like a different distributor etc. The product literature makes claims. I just wonder if anyone has seen the claims in a measurable parameter.
Thank you
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Le Mans Master
Joined: Feb 2005
Posts: 6,485
Likes: 566
From: Clearwater Florida
C409,
Did the new distributor give you a measurable change i.e. HP, economy, etc. Just wondering. Every time I see something like a different distributor etc. The product literature makes claims. I just wonder if anyone has seen the claims in a measurable parameter.
Thank you
Did the new distributor give you a measurable change i.e. HP, economy, etc. Just wondering. Every time I see something like a different distributor etc. The product literature makes claims. I just wonder if anyone has seen the claims in a measurable parameter.
Thank you
Drifting
Joined: Feb 2013
Posts: 1,464
Likes: 48
First of all thank you for the response. And that brings up another question. My car does not see RPM above 5000, mostly just a driver. So when ever I look at high performance modifications I see that they usually are for higher RPMs. I am wondering about modifications that have an effect on a car that is basically a highway driver and once in a great while a day at the track.
Team Owner
Joined: Jul 2004
Posts: 28,475
Likes: 3,291
From: Hartford WI
First of all thank you for the response. And that brings up another question. My car does not see RPM above 5000, mostly just a driver. So when ever I look at high performance modifications I see that they usually are for higher RPMs. I am wondering about modifications that have an effect on a car that is basically a highway driver and once in a great while a day at the track.
As to your second question, "How much money you got?" is the question. That determines what you can or cannot do. Before we go there, we need to know what we can spend. That determines if we can do intakes and headers realistically with a tune. If you do the work yourself, under $4500.
Le Mans Master
Joined: Feb 2005
Posts: 6,485
Likes: 566
From: Clearwater Florida
..... For a basically stock engine , the OEM HEI distributor is more than adequate … save your money … the coil in cap HEI has some performance built right in … most obvious is the direct coil to rotor spark … no coil wires to fail , burn , or that just increase the distance that the current needs to travel to accomplish its task … second , the wider spacing of the spark plug terminals in the large cap HEI help to minimize , if not prevent , spark cross-over from the rotor tip to spark plug terminals … the advantage to most aftermarket distributors is generally their precision … that precision becomes more of a necessity in high revving applications …..
Team Owner
Joined: Jul 2004
Posts: 28,475
Likes: 3,291
From: Hartford WI
most obvious is the direct coil to rotor spark … no coil wires to fail , burn , or that just increase the distance that the current needs to travel to accomplish its task …
second , the wider spacing of the spark plug terminals in the large cap HEI help to minimize , if not prevent , spark cross-over from the rotor tip to spark plug terminals …
the advantage to most aftermarket distributors is generally their precision … that precision becomes more of a necessity in high revving applications …..
second , the wider spacing of the spark plug terminals in the large cap HEI help to minimize , if not prevent , spark cross-over from the rotor tip to spark plug terminals …
the advantage to most aftermarket distributors is generally their precision … that precision becomes more of a necessity in high revving applications …..
Is that a big problem? I misted my small cap distributor several times but I haven't noticed that issue. I suppose with cheap wires it could be.
I think it is also easier to find in that more people seem to make one. Besides DUI, seems like they have more brands for the small cap one and the cap and rotor replacement is easier to get? Or so I casually noticed. Could be wrong.
