| Author | Message | ||
     Fred Bremier (Fb111) New Member Username: Fb111 Post Number: 15 Registered: 01-2003 |
A couple of Range Rover Classic owners are trying to convert to GM HEI distributors. Our problem is there is a wire leading from the stock distributor to the ECU telling the ECU engine RPM's. Anybody out there know how to make this interface without frying the ECU? There is a terminal on the HEI that is used to signal a tachometer. Can this be used? Thanks, Fred | ||
| Peter Matusov (Pmatusov) Senior Member Username: Pmatusov Post Number: 1371 Registered: 09-2002 |
Fred, I'd suggest hooking up an oscilloscope to the wire from the stock ignition module to ECU. I may be able to do a similar thing on an HEI-equipped jeep, and tell you what to expect from HEI Tach connection. My guess would be that the waveform is the same, but I would not hook it up to the ECU without verifying things first. Peter | ||
| eric johnson (Eric2) Senior Member Username: Eric2 Post Number: 286 Registered: 05-2003 |
So, what are your reasons for swapping in a GM HEI unit? I would think the internal coil would be more susceptable to the heat, in an already hot engine compartment. Interesting swap though. | ||
| Peter Matusov (Pmatusov) Senior Member Username: Pmatusov Post Number: 1373 Registered: 09-2002 |
Eric, theory aside, there are hundreds of thousands trucks with perfectly running HEI, compared to 3.9 layout with questionnable reliability. Also, you don't have to swap the entire HEI distributor - you could use HEI ignition module in lieu of Rover's. | ||
| Scott Scott (Scottoz) Member Username: Scottoz Post Number: 170 Registered: 02-2003 |
I converted my rover module to Australian Bosch. $50aus and it works fine. The module for the D1 is the same as many other cars in Australia, including Holden Commodore and Monaro(I cant remember what they call the Monaro in the US but we export them 2 you - I think it comes out as a Chev somthing - big sexy 2 door coupe with a 5.7litre Gen III V8; the engine that we stole from you fellas in the first place!). Cheers | ||
| Steve Hoare (Pabrit) New Member Username: Pabrit Post Number: 13 Registered: 05-2003 |
The UDI (HEI) distributor that Fred and I are looking at fitting does not appear to have an amplifier fitted. Other than the HT leads, the distributor has two connections. One 12V input, the second a feed for the tach. Looking for input to fit units to a '94 & '95 4.2L Cheers | ||
| Peter Matusov (Pmatusov) Senior Member Username: Pmatusov Post Number: 1374 Registered: 09-2002 |
Steve, in an HEI distributor the amplifier is mounted under the cap. | ||
| Scott Scott (Scottoz) Member Username: Scottoz Post Number: 171 Registered: 02-2003 |
the amplifier is the coil pick up coil unit under cap. | ||
| Geoff 93 RRC (Geoff) Senior Member Username: Geoff Post Number: 272 Registered: 11-2002 |
Scott Oz - can you post the GM (AC?) part no. for us? | ||
| Fred Bremier (Fb111) New Member Username: Fb111 Post Number: 16 Registered: 01-2003 |
The GM HEI with aftermarket parts added is bulletproof. It can literally run service free for 100k. It has a 50,000 volt coil that allows extremely large plug gaps for more complete combustion and at a price far less than the cost of a Rover distributor. Fred | ||
| eric johnson (Eric2) Senior Member Username: Eric2 Post Number: 287 Registered: 05-2003 |
What GM HEI fits a Buick/Rover V-8? Well, if you guys work the bugs out an tell us, we'd be grateful. | ||
| Fred Bremier (Fb111) New Member Username: Fb111 Post Number: 17 Registered: 01-2003 |
The 350 Buick HEI Distributor from the mid 70's is a direct drop in. The distributor must have a vacuum advance unit. The big block Buick from the same time period requires changing the distributor drive gear to that of the 350's. However, this doesn't resolve the RPM signal issue to the Rover's ECU. I know it can be done. I have seen a MG guru's MGB GT with an injected 4.9 liter Rover engine, running a GM distributor. He hasn't gotten back to me yet on how its done. Fred | ||
| eric johnson (Eric2) Senior Member Username: Eric2 Post Number: 289 Registered: 05-2003 |
Get on his case, tell him the future of the (Land Rover) world depends on it!... this is good stuff. Just called a local auto parts store - '74 - '81 Buick HEI dizzy - $166. What are Rover dizzy's, $300+ ? |
