924Board.org

[Legitimate Salvage]

The question: If you could do only one (EFI or SC), which would you choose?

I'm leaning strongly towards the EFI based on the list below

Random considerations for my 924:

1. The car has consistent cold start AND hot start problems.** I've been reading/researching kJets. I'm confident in my ability to go through it and get it working... better. But if I get to needing to replace (vs. rebuilding) parts, it could get pricey.

2. Other than the fuel system (it also needs wheel bearings and struts/shocks) the car is in good enough condition to be driven on the daily. I won't daily drive it, but it's nice to know that when my Audi A3 goes into my garage for a clutch in a few months, I'll have something to drive.

3. Living in the Southeast USA's hottest/driest summer on record so far, I'm daily reminded that Air Conditioning proves that God exists, loves us, and wants us to be comfortable. I have on hand what I need to get the ac working on my 924. Yes, I know that the SC kit would require an AC delete.

Based on these points, I'm leaning strongly in the direction of doing the EFI. For those who have done it, will I notice any performance gain going with EFI only? It's a 924 and it will never be "fast" by today's standards, but I would like for it to have a bit more "scoot."

I also have concerns about parts availability for the EFI conversion if I have a problem with the components several years down the road. Are the electronic bits readily available from another source? OTOH, the SC kit is just a box of mounts and Eaton SCs (and parts kits for them) are common.

Sorry for this "stream of consciousness" post, but I'm looking to get opinions on which option (EFI or SC) will give me a 924 that is more reliable and more fun to drive.

Peace,
The Rocinante
Legitimate Salvage



**I'm hoping part of that might be partially remedied when I replace the soft fuel return line between the hard fuel line and the bottom of the gas tank... it's hard, dry-rotted and has a couple of hairline splits.

[924RACR]

Having done one EFI conversion already - OMG yes. Such a massive improvement (even though mine was 931 not 924). Can't wait to have enough spare time to start my next one, on the NA racecar.

But I'd also point out that slapping on a SC will more likely make your running issues worse, certainly not better...
_________________
Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

[morghen]

If you can get your k-jet in good working order, you can go for the fun bit, otherwise you should either fix the k-jet or get the EFI.
No point having a supercharged 924 that wont start in the morning or after you went shopping for 30 minutes and want to leave.

With EFI you will get a bit more out of the old engine, but only slightly more.
I provide a map for the NA but you can find a local shop that can further adapt the tune to your car and fuel.
But expect that you wont feel much of a difference...except it will be reliable.

EFI wear out parts are common ones, if some sensor fails in the future, you read the part number on the old one and you order a new sensor.
They are standard sensors used for many vehicles.

I also plan to stay in the business, so if you buy from me and should you have an issue down the line, i'm sure we can find a solution.
_________________
Supercharger and EFI kits
https://www.the924.com

[Legitimate Salvage]

*duplicate post, see next reply*

[Legitimate Salvage]

That’s reassuring to know that the sensors are “off the shelf” and could be easily found.

The EFI question has been a long evolution of thought. Initially, I didn't want to go EFI as I wanted to keep the car as "stock" as possible. But I eventually came around to "If I get the kJet working, what does that gain me... a working kJet that's 45 years old and will need ongoing maintenance/tinkering." The EFI seems more of a "fire and forget" modification.

Then there's the look on my wife's face the other day when I told her the SC would require an AC delete. Yep... that's why she's the "Supreme Allied Commander."

EDIT: Don't know what happened to my response yesterday. I'd typed in all of this and for some reason, only the first sentence posted.

[morghen]

This is not the most representative EFI install and in this picture the installation wasnt finished, but the look of the engine bay doesnt change much with my EFI kit, especially if you do a neat job tucking and placing everything..

If you show this to your average car guy he wont be able to tell that tehre is something not original.
I bet you a beer or two that even your average 924 guy wont see this at first glance.
Everything is where it "used to be" its just some small details here and there that give it away..and those details could pass for "new revision parts" for most people.


_________________
Supercharger and EFI kits
https://www.the924.com

[Cedric]