I know I'm not the only one who is interested. There are some extremely knowledgeable people here on the subject. A few of us who are slowly starting to figure things out and probably a great amount of interest in the subject by those new to the whole concept.
We could have people talk about mods that work, mods that failed and the does and don't's .
Products to use and ones to avoid. Trusted places prices and brands.
Just follow the link below to my site, my email and phone number are right there 
OK here's a quick question, can you connect access to OBD2 on a Megasquirt system?
frenchyd said:OK here's a quick question, can you connect access to OBD2 on a Megasquirt system?
Here's a quick answer. No.
To go along with what 93gsxturbo said, a Megasquirt REPLACES the factory ECU. Just like any other standalone engine management.
You'll likely have the best luck with the Holley system, but it's not cheap.
In reply to z31maniac :
I'm seeing Megasquirt connected to the V12 engine. But I've never seen Holley incorporated on a Jaguar V12.
I know the Lucas system doesn't have OBD2. But that's such a helpful system for diagnosing problems I'm trying to find a way to incorporate it.
I am going to switch all the sensors to GM with the exception of the Hall crank position sensor in the distributor*. Since it's easy to do. Plus junkyard shopping I should be able to pick up spares cheap enough.
But without OBD2 it's just repetitive swapping until I find the problem.
The one thing I really understand about racing is if you have spares, tools, and know how to replace them they never fail.
Sunday Gospel according to Frenchy.
After Ford bought Jaguar they eliminated the distributor and switched to a coil on plug system using a crank trigger.
They are rare compared to distributor fired systems but if that gets me the ability to use a OBD2 system. I can start hunting.
You can diagnose things via tunerstudio, data logging and a wideband if running MS or speedino without the need for OBD2 as well. In fact about the only thing you wouldn't be able to diagnose with such tools would be the sensors that fail as part of the OBD2 system that aren't needed or installed on a non OBD2 system.
Or you could toss a 350 into the Jag, Holley makes an EFI setup for the 350...
In reply to Captdownshift (Forum Supporter) :
Where is the smiley face for your last comment? ;-) does Holley have OBD2?
Actually what you are suggesting is to leave the laptop connected so I'm capable of diagnosing faults? ( except sensors)
From what I remember after reading several books and magazines is that the vast majority of problems will be sensors.
Those with EFI tuning skills may be able to diagnose problems that way.
I don't feel capable myself. I'd like to at least eliminate sensors as the problem first before I go running across town for help.
If I should invest in another system instead of the Megasquirt ( say Megasquirt Gold? ) to be able to hook up A OBD2 port I'm sure willing .
In reply to frenchyd :
There are 2 easy buttons, one is to fit a GM TBI setup, then go Holley as it'll work with the TBI as a starting point for the conversion.
Or..
OBD2 is simply not needed in either case and merely overcomplicates things.
If you are switching to an aftermarket ecu you will be using the software for that ecu to communicate & diagnose. You may not get a standard fault code like obd2 but you should be able to see if a sensor is not reading corectly through the software displays. The best feature of obd2 was misfire monitoring through crank position readings, i dont know if the aftermarket systems can do that. Are you planing on doing port fuel injection or throttle body fuel injection? Alot of aftermarket efi systems can not do sequential fuel injection on 12 cylinders, so you may have to use 2 ecu's. BMW did this with there v12's. Or use a batch fire setup.
In reply to Captdownshift (Forum Supporter) :
Interesting. Excuse my ignorance but does the GM TBI have the ability to fire ignition to the 12 cylinders with the help of the Megasquirt ? Or is the Megasquirt surplus?
I suppose I'd need to find a post 1999 to get OBD2?
I don't know when flex fuel was started but shouldn't I be able to pull the fuel sensor off any flex fuel vehicle and add it to the TBI?
My goal is to use the 2 new turbo's to boost and burn E85 rather than racing fuel.
Sequential fueling isn't needed for a race car. But if I go to Megasquirt Gold I know that I can use it. Otherwise batch firing is fine.
This plus two Holley EFI units of your choice. Or ask Holley how to run two Snipers on one ECU.
I'm pretty sure you could just run two carb style EFI units in parallel and be quite happy.
AnthonyGS (Forum Supporter) said:This plus two Holley EFI units of your choice. Or ask Holley how to run two Snipers on one ECU.
I'm pretty sure you could just run two carb style EFI units in parallel and be quite happy.
Am I the only one that wants to then weld something up that would mount on top of those that would then allow you to add a single carb/holly EFI unit? Or one of the low-pressure central injection units that GM made and put on some may trucks can cars?
Wait if I remember the distributor is in the middle of those motors yes? That makes my idea, not that plausible LOL.
In reply to Caperix :
Jaguar has always used batch fired for fuel. Clear back to 1975 when it basically used 3 Bosch VW Rabbit units.
Now Jaguar fired the ignition separately right up to about 1993. G M electronic ignition to a Hall effect distributor to Champion spark plugs.
dean1484 said:Wait if I remember the distributor is in the middle of those motors yes? That makes my idea, not that plausible LOL.
Right up to Ford's system using crank fired coil over plug. Well 6 coils. And it split dry firing the opposite cylinder.
dean1484 said:AnthonyGS (Forum Supporter) said:This plus two Holley EFI units of your choice. Or ask Holley how to run two Snipers on one ECU.
I'm pretty sure you could just run two carb style EFI units in parallel and be quite happy.
Am I the only one that wants to then weld something up that would mount on top of those that would then allow you to add a single carb/holly EFI unit? Or one of the low-pressure central injection units that GM made and put on some may trucks can cars?
Well don't choke when you hear the price for those manifolds. Plus the system isn't well sorted.
The much simpler is the factory 1971-1974 4 four carbs. Together they are bigger than a Holley dominator. They are stone simple 100 times simpler than a Holley. Or you can convert it from the Strombergs to SU's and pick up 25 more horsepower. Remove the dog leg and gain 40 horsepower. Switch the jets to use E85 and pick up another 35-50 horsepower.
frenchyd said:In reply to Captdownshift (Forum Supporter) :
Actually what you are suggesting is to leave the laptop connected so I'm capable of diagnosing faults? ( except sensors)If I should invest in another system instead of the Megasquirt ( say Megasquirt Gold? ) to be able to hook up A OBD2 port I'm sure willing .
Megasquirts have the ability to datalog to an on-board SD card so you don't have to leave a laptop connected. You can set a trigger to start datalogging and then download and examine the logs in MegaLogViewer at your leisure. If you have a sensor that is not operating properly you will be able to determine that from the log. I run a megasquirt and start a datalog on the first instance of WOT after power-on, although you can use just about any parameter as a trigger. There are also numerous parameters that you can log which are calculated by the ECU on the fly which is nice. Like if you have a speed sensor and tell the ECU the trans ratios and rear axle ratio it will figure out and log which gear you are in without actual sensors on the shifter or in the trans. You can easily reach data overload if you so desire.
In reply to frenchyd :
No megasquirt needed if going GM TBI and Holley. The Holley would be redundant. However if going boost, I'd redo the ignition system and upgrade the fueling and go MS
stukndapast said:frenchyd said:In reply to Captdownshift (Forum Supporter) :
Actually what you are suggesting is to leave the laptop connected so I'm capable of diagnosing faults? ( except sensors)If I should invest in another system instead of the Megasquirt ( say Megasquirt Gold? ) to be able to hook up A OBD2 port I'm sure willing .
Megasquirts have the ability to datalog to an on-board SD card so you don't have to leave a laptop connected. You can set a trigger to start datalogging and then download and examine the logs in MegaLogViewer at your leisure. If you have a sensor that is not operating properly you will be able to determine that from the log. I run a megasquirt and start a datalog on the first instance of WOT after power-on, although you can use just about any parameter as a trigger. There are also numerous parameters that you can log which are calculated by the ECU on the fly which is nice. Like if you have a speed sensor and tell the ECU the trans ratios and rear axle ratio it will figure out and log which gear you are in without actual sensors on the shifter or in the trans. You can easily reach data overload if you so desire.
That's what I'm frightened by. Data overload. In spite of reading everything available I just recently began to understand that mega squirt was self learning.
Just a few weeks Ago I began to understand the way the fuel was delivered. Previously I had envisioned the injectors somehow squirted in sequence in spite of endlessly reading it was batch fired.
I've finally put everything together. I think I even understand how it puts everything together so extra fuel is squirted as needed.
But trying to make sense of the data output to figure what's wrong is way beyond my grasp.
That's why an OBD2 ( and reader ) would be so helpful to me.
dean1484 said:Wait if I remember the distributor is in the middle of those motors yes? That makes my idea, not that plausible LOL.
Actually the distributor is very low. So the carbs or injection system is well above the distributor.
Watch and attend as many HP academy videos as you can, you'll learn the outputs and how and what to adjust. There's a learning curve, but 20-60 hours in and you'll have the confidence to go with it. You'll spend 20 hours planning and sourcing bits for an OBD2 conversion. There's no need to reinvent the wheel when you can research why and how they ended up making it round.
In reply to frenchyd :
You were asking about EFI. I was pointing you to Holley carb mount EFI units.
I was not recommending any carburetors...... I keep suggesting you need to communicate more clearly. I'm not joking. You once made a post about adjusting a seat for racing that was just a long story on how Dale E spent all his time adjusting his seat.....
This is really why you get a lot of grief here. Your $2000 painting post is another example. I really want to enjoy and read about your Jaguar posts, but this circular unfocused communication style really gets in the way. Good luck.
In reply to Captdownshift (Forum Supporter) :
I Read the books, magazines, watched video after video. It was like reading a bad translation of system instructions.
20 hours? I've spent more time this week than that. I've been reading about the subject since 1978 .
Just read the answers I'm getting. They are all over the place. Someone tells me to ignore sensors and get the data log to tell me what's wrong. Yet everything I've read tells me the most common problem is the sensors.
Another guy tells me to buy a Holley system ignoring the multitude of problems that presents and still no easy way to confirm things are correct. Ie no OBD2
I'm almost to the point of connecting wires and buying the plugs/ connectors etc. I've seen enough video's etc to know it can be done.
There are no step by step instructions out there. No wiring diagram's. so what if I connect something wrong? Why not have something that will inform me the Hall effect sensor is connected wrong?
AnthonyGS (Forum Supporter) said:In reply to frenchyd :
You were asking about EFI. I was pointing you to Holley carb mount EFI units.
I was not recommending any carburetors...... I keep suggesting you need to communicate more clearly. I'm not joking. You once made a post about adjusting a seat for racing that was just a long story on how Dale E spent all his time adjusting his seat.....
This is really why you get a lot of grief here. Your $2000 painting post is another example. I really want to enjoy and read about your Jaguar posts, but this circular unfocused communication style really gets in the way. Good luck.
You are aware that manifold won't fit under the hood of the Jaguar? That the Holley system does not have any input for boost or Flex fuel? Or OBD2?
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