RB20DET vs. SR20DET

[S13 Silvia]

From your personal experience, what normally comes out on top? What's better in low-range and top-range? What pulls off the line better and what normally wins in the end?

I'm asking this because I am considering doing a RB20DET conversion in my auto ca18de because RB's are heaps cheaper than SR's.

[BOOSTMEISTER]

Here is a good comparison

My R32 gtst (rb20det manual)

fmic

3.5" turbo back exhaust

filter

cold air box

15 psi

vg30 turbo

s-afc

bigger fuel pump

My friends 180sx (sr20det manual)

fmic

3" turbo back exhaust

filter

13 psi

gtr fuel pump

Basically both cars are pretty much even up to 150km/h then the skyline gets about 2 car lengths on the 180 up to 220km/h

ALL TESTING WAS PERFORMED UNDER CONTROLLED CONDITIONS BY EXPERIENCED DRIVERS. IT IS NOT RECOMMENDED THAT THESE ACTS BE DUPLICATED ON OPEN ROADS. ALWAYS WEAR YOUR SEATBELT WHEN DRIVING AND HAVE A NICE DAY

[U WERE MINE]

Originally posted by BOOSTMEISTER

ALL TESTING WAS PERFORMED UNDER CONTROLLED CONDITIONS BY EXPERIENCED DRIVERS.  IT IS NOT RECOMMENDED THAT THESE ACTS BE DUPLICATED ON OPEN ROADS.  ALWAYS WEAR YOUR SEATBELT WHEN DRIVING AND HAVE A NICE DAY

hahahhaha *cough* bullshit *cough*

well think of this .. with the money u save on gettting the rb20det, u can get a new turbo or ecu or whatever u want.. then which will be quicker??

engines both have there good and bad points.. sr20det is an alloy block adn the rb20 is the cast iron... sr20det has a timing chain rather than a belt.. rb20det is a 6cyl thus more torque

both engines are bloody awesome.. but it always goes down to money in the end...

[BOOSTMEISTER]

That's the big factor in all things I recon...bang for your buck... if you go the rb then you need a engineer cirt because you go from 4cyl to 6cyl......I have personally done this conversion so if you need any tips let me know.

I would probably go for the rb for the torque...

URMINE hows your heater going?

Cam

[Nismo_Boy]

trust me I'm doing the rb25det swap now you will be much happer with it, yeah sure the rb20det left a smile a my face but it still wasn't quick enough.

[BOOSTMEISTER]

Why not spend the $3000+ on the CA, they are tuff motors and can produce heaps of power....have a look at www.autospeed.com they feature a 270rwkw ca

[U WERE MINE]

heater core will be getting fixed up next week.. its hard to get sorted when u got no license .. also gonna have another stab at fixing that missing problem i was having .. ahhh car problems

[U WERE MINE]

only prob with a rb25det in a silvia.. is that it could be too much.. just a bit too heavy for the silvia and might upset the natural balance of the car..

[Nismo_Boy]

we will see when the car comes back form the shop...

[Nismo_Boy]

just a bit too heavy for the silvia and might upset the natural balance of the car..

the guys doing my convertion are working a 300zx convertion for the silvia, now that is an over kill.

[U WERE MINE]

hahaha nismoboy.. id love to see that..

have u seen under the bonnet of a 300zx?? its as compact as u get.. id love to see how it would fit!!!

[Nismo_Boy]

I'd love to see how it would fit as well, but no bull shit they had a silvia all ready and the guy's were working on the motor when I was last down there.

[U WERE MINE]

jeez.. with the money they spend on that..id rather rebuild an sr20.. chances are it would kill the thing wiht the vg in it anyway..

[meggala]

I entertained the idea of putting and sr in my r32 its is done quite often in japan they also put them in laurel and cefiro's but the rb does have more torque modifyable ecu and has good potential.

meggala

[S13 Silvia]

Thanks for all your help guys. On the High Performance Imports video Vol 3. (currently being borrowed by me off a friend ), they show a S13 Silvia with a VG30DETT in it. Pretty PHAT I reckon!

And I'm not going to spend the money on my current ca because it is non-turbo. Spending 2k on my current engine, would that bring it up to scratch with a rb20det (serious question)? And I definantly won't be putting a rb25det into it because of the cost.

Also, boostmeister, what has to be fabricated/welded/altered to put the rb20 in the S13? I've heard that the heater hoses have to be altered and besides everything in the halfcut, you'll need a rb tailshaft and a bigger fuel pump in the tank. Is that it?

[BOOSTMEISTER]

Actually all you need is the pump, and the power steering pump has to be changed as the old one had 4ws outputs. We used a cefiro radiator and pipes as well.

Cam

[REDGTT]

Guys stock for stock The Rb has less toque than the sr20det and will always be less torque. six 8 or ten cylinders dont matter as the stroke on the Rb20det is very very short. Good for revving but thats about it.

Rb25det is the way to go.

Sr20det has a timing chain and roller rocker arm style setup.

Alloy block is light but there is so much alloy there that it doesnt make a big difference.

Rb20det is a tough motor. But so is the sr20det.

I say different strokes for different folks. LOL

[Morgs]

Whered' my post go? :run:

[REDGTT]

rick LOL what are you yapping on about again?

[ultim8DTM5]

be sure to install a manual box at the same time as the conversion!

i think you will be very happy with whatever you choose, great improvment on an atmo ca18 with auto!

:uh-huh: