MQ RB25 conversion

Post by **Red Patrol 84** » Fri Jan 30, 2009 6:50 pm

I have an '84 MQ KM160 & am thinking of replacing my L28 with an RB25 from a 1988 VL Commodore, has anyone out there done or know of anybody who has done this conversion? If so, what does it entail, how hard is it? Is it expensive? Alternatively, What about a P40? Are they any good? Same questions as previous. Love my MQ but wish it had more power but don't want to go the V8 route!:?:

Post by **bigbluemav** » Fri Jan 30, 2009 6:56 pm

Aren't they RB30 (3.0 litre 6 cyl)?

Post by **stool** » Fri Jan 30, 2009 7:43 pm

I think some VLs had the Rb20
but I have never herd of a standard vl rb25

Also Look into a Nissan 280z engine for your patrol
For go fast parts

Post by **chunderlicious** » Fri Jan 30, 2009 7:46 pm

RB20d/e are in some R31 skylines (pintara like things)
RB20det/de are in R32 skylines
RB25det/de are in R33 skylines
RB25NEOdet/de are in R34 skylines
RB26DETT are in R32, 33 and 34 skyline GTRs
RB30et/e/(whatever the carb was titled) were in VL commodores, patrols and im sure some other shit.

RB30DET/DETT are a breed on 30 bottom end with DETT or DET head fitted
RB27DETT is a farkin beautiful engine that most of the drag racers build (one brand makes them in particular) and nearly all do 9 second passes in street trim.

if i got anything wrong please correct me.

as for the conversion, RB25DET out of a R33 would be kick ass in an MQ, mated to a GQ 2.8 diesel box and transfer.

RB30 efi would still be pretty kick ass, same thing, mounted to a GQ 2.8 diesel box

these are the same box attached to the RB30 in the GQ patrols

Post by **MyGQ** » Fri Jan 30, 2009 8:23 pm

chunderlicious wrote:RB20d/e are in some R31 skylines (pintara like things)
RB20det/de are in R32 skylines
RB25det/de are in R33 skylines
RB25NEOdet/de are in R34 skylines
RB26DETT are in R32, 33 and 34 skyline GTRs
RB30et/e/(whatever the carb was titled) were in VL commodores, patrols and im sure some other shit.

RB30DET/DETT are a breed on 30 bottom end with DETT or DET head fitted
RB27DETT is a farkin beautiful engine that most of the drag racers build (one brand makes them in particular) and nearly all do 9 second passes in street trim.

if i got anything wrong please correct me.

as for the conversion, RB25DET out of a R33 would be kick ass in an MQ, mated to a GQ 2.8 diesel box and transfer.

RB30 efi would still be pretty kick ass, same thing, mounted to a GQ 2.8 diesel box

these are the same box attached to the RB30 in the GQ patrols

The RB30S was put in the patrol which is the carby version
the RB30E/T made their way from the Skyline into the VL Commodore, E series were EFI and the ET were the EFI Turbo'd.

a RB25 would be great in a MQ or GQ. MQ will be hard to mate up to even using a RB30 gearbox and transfer as the diff at the rear is offset and the GQ gearbox is straight out the middle of the box tailshaft.

a RD28T GQ would be a good donor for a RB25DDET Transplant as the Gearbox is the same as the RB30 and the RB30 and RB25 have the same bout out pattern. Seen a GU with a RB25 in it, man it flies.

Post by **Red Patrol 84** » Fri Jan 30, 2009 9:43 pm

[Thanks to everyone! Will ask my mate again what the engine he has is! sure he said RB25, is EFI!color=orange][/color]

Post by **Red Patrol 84** » Fri Jan 30, 2009 10:01 pm

My apologies, after having checked VL specs you are all absolutely correct, engine would have to be an RB30!

Post by **chunderlicious** » Sat Jan 31, 2009 8:30 am

RB30 EFI is still going to be a pretty good conversion for an L28. it wont blows your pants off but it will be nice. if you add a turbo...... ask nutter what that feels like, he cant speak highly enouh of his.

Post by **chimpboy** » Sat Jan 31, 2009 1:02 pm

chunderlicious wrote:RB30 EFI is still going to be a pretty good conversion for an L28. it wont blows your pants off but it will be nice. if you add a turbo...... ask nutter what that feels like, he cant speak highly enouh of his.

I agree, I think you'd be pretty satisfied with the RB30 as compared with the L28. Not that the L28 is all that bad.

Post by **Red Patrol 84** » Sat Jan 31, 2009 1:25 pm

Getting excited about this, found a guy on another forum who has done the conversion, he said it was fairly cheap & simple! just had to drill out top bolt holes on standard MQ 4-speed bellhousing as they didn't quite line up, & modify engine mounts! he says the most expensive part was getting the EFI wired in! I have been given a VL donor vehicle with a recently recond motor (defected for suspension) so very cheap but will have to convert from auto to manual. Was wondering if maybe GQ bellhousing will go onto MQ box?

Post by **Sterlo** » Tue Feb 03, 2009 6:48 pm

the RB will bolt to the L28 bellhousing but from memory the engine will be on a fair old lean..

Post by **Red Patrol 84** » Tue Feb 03, 2009 7:15 pm

Have found that out also, have elected not to go ahead, have decided to pump some steroids into my L28 instead!

Post by **dlowe** » Sun Feb 08, 2009 8:47 pm

Apperantly the efi head off the l28e engine which came out in the z series will bolt straight onto the l28 block, so maybe getting away from an engine transfer at all?

Post by **Red Patrol 84** » Sun Feb 08, 2009 9:53 pm

Yes, L28E! The EFI systems found on a number of vehicles utilizing the L28 will apparently fit my head! So am looking in that direction!

Post by **dave_str** » Thu Feb 12, 2009 12:28 am

R31 Pintara's ran the CA20E not the RB20E/DE.

Some Japanese spec R31 Skylines ran the RB20E/DE/DET, the also ran the CA18E, CA20E, RB20E/DE and I am pretty sure the LD28 was an option aswell.

New Zealand got some RB20E powered VL's.

Dave.

Post by **Nat84** » Tue Apr 28, 2009 3:28 am

chunderlicious wrote:RB20d/e are in some R31 skylines (pintara like things)
RB20det/de are in R32 skylines
RB25det/de are in R33 skylines
RB25NEOdet/de are in R34 skylines
RB26DETT are in R32, 33 and 34 skyline GTRs
RB30et/e/(whatever the carb was titled) were in VL commodores, patrols and im sure some other shit.

RB30DET/DETT are a breed on 30 bottom end with DETT or DET head fitted
RB27DETT is a farkin beautiful engine that most of the drag racers build (one brand makes them in particular) and nearly all do 9 second passes in street trim.

if i got anything wrong please correct me.

as for the conversion, RB25DET out of a R33 would be kick ass in an MQ, mated to a GQ 2.8 diesel box and transfer.

RB30 efi would still be pretty kick ass, same thing, mounted to a GQ 2.8 diesel box

these are the same box attached to the RB30 in the GQ patrols

sorry guys i know this is abit old but

RB20det/de are in GTST HR31 (R31 2doors), passage GT HR31 (R31 4 door), R32 skylines, cefiro, GTS-4 R32
RB25det/de are in R33 skylines, Nissan Stagea
RB25NEO are in R34 skylines, Nissan Stagea
RB20NEO (non turbo) are in R34
RB26DETT are in R32, 33 and 34 skyline GTRs
RB30et were in VL commodores, patrols, R31 skyline

Post by **Red Patrol 84** » Tue Apr 28, 2009 12:09 pm

Thanks for your post mate, you're right it has been a while & sadly the project had to be put on the backburner for now for various reasons but am still hoping to go ahead in the near future although I've decided to stick with the L28 & pump some steroids into it instead!

Post by **crankycruiser** » Tue Apr 28, 2009 8:31 pm

Red Patrol 84 wrote:My apologies, after having checked VL specs you are all absolutely correct, engine would have to be an RB30!

unless sumone has put a 25det into the VL! its a very common conversion, bolts straght into a VL / R31 so maybe someone has done a conversion to ya mates VL?

Post by **Red Patrol 84** » Tue Apr 28, 2009 8:46 pm

Quite possible, never thought to check!

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