Thread: 3,9 into an 1986 rrc! Is it worth it?)

depends on your plans with the 86 RRC.

I recently converted my RRC 4.2 from carby to efi, even though some parts where a pain (only cause it was a putting efi gear on an older motor).
cause my RRC has a good motor, good body and i plan to keep it for a long time.

the hardest part for mine (other then getting it running ) was swapping fuel lines and converting/swapping the fuel tank.

The 3.9 is a much more appropriate engine for the weight of the RRc.

The engine will bolt straight in.

The RRC has 35s, lt77, maxi's f and r BUT standard diff gears, (will be 4.7 later.)

Just to clarify no ECU changes either?
Cheers NAT

I did find a 4.0 on the net out of a P38!! Would love to put this in although will the ecu adapt?

Cheers NAT

Originally Posted by nat p

The RRC has 35s, lt77, maxi's f and r BUT standard diff gears, (will be 4.7 later.)

Just to clarify no ECU changes either?
Cheers NAT

Goodness, it must be slow as a wet week! Just use the 3.9 ecu and all is apples, easy to wire up

Oh, I don't think they are worth it, not enough horsepower still

Originally Posted by nat p

I did find a 4.0 on the net out of a P38!! Would love to put this in although will the ecu adapt?

Cheers NAT

No, well yes but very difficult ecu to play with from the p38

bugger!

and yes I think I can run faster! its stupidly slow, changing the diff ratios helped ALOT!

oh well the search continues for a power upgrade!

Cheers NAT

does that inclulde the 4.6 in the difficult ECUs?
Cheers NAT