The V8 Owners Forum -

Ok, thanks Mike for the info, and all before Mike who have also given their opinions. It all been very helpful hearing other peoples views and I do really appreciate it :D . Its interesting as a fellow SD1 Club member also had a JE101 cam fitted to his 3.9 and he too suffered from the same symptoms....

In my case, with the JE engine, I've something of a dilemma and uncertain of a few things. Firstly, the car is not equipped with the 14CUX Hotwire type fuel injection system, its actually the original Lucas 4CU fuel injection that was standard on the SD1 and the Range Rover in the 1980's. Is an afte...

WOT is Wide Open Throttle a vacuum advance does exactly as the name says, it advances the spark under high vacuums. this helps to improve fuel economy at part throttle. not sure why race distributers dont have a vacuum advance... though it could be due to the fact that they dont actually make a lot...

Too much ignition advance can cause the symtoms described, try backing the timing off a couple of degrees and going for a drive. Assuming the EFI unit does not control the sparks ? :oops: Mark Tried backing off the timing. The bucking was reduced by retarding the timing, but so was the cars perform...

The "hotwire" bit is the air flow meter, the ECU is the electronic box that Mark adam's chip (s) plug into, I am recommending the replacment of the electronics box with either a Megasquirt, Extra efi, emerald, Vems, ECU (and at the same time you can bin the air flow meter. The timng of yo...

crayefish wrote: That probably means you have a race distributer. great for WOT and racing, but rubish for fuel economy etc

Whats WOT?

Whats the idea behind race distributors, and what difference does having a vacuum advance pipe make?

Oh bugger!

Just realised I'm totally screwed ! Should have put this at the beginning of the post. I see that Jon Anderson is on Hotwire Efi, and that any recommended ECU changes would be for a Hotwire system. Problem is I'm living in the dark ages with the original FLAPPER type Efi system.

ChrisJC wrote:
Just my 2pm worth anyway.

Chris.

Going by the picture, I see what you mean.

Do you know what the duration of the camshaft is? It does indeed sound as if it has not been built as a general road going car. Ron. Am a little thick when it comes to the technical aspects of camshafts, still learning. In a book, it lists the values of the JE101 as Timing 20/65/25/20, Period 265/2...

Hi Personally I would replace the ecu and see how well a properly set up mapable ECU can transform your engine, overall the second cheepest option (by about £200) on initial outlay and as you can tune it by driving it on the road it will save a fortune in rolling road time. Mike Are we talking 'Hot...

I have just recommended to someone else with the same problem as yourself to try disconnecting the vacuum pipe from the distributor, plugging it so the mixture isn't weakened, and then see if it makes any improvement, he hasn't reported back yet so perhaps you would like to give it a try and let us...

I'm the owner of a Rover SD1 Vitesse Twin Throttle Plenum (with flapper Efi) with an engine rebuilt by JE Engineering (work carried out while under ownership of previous owner). Its the driving characteristics of the car that I cant get my head around. Being a novice in V8's, when I purchased the ca...