Jump to content
SAU Community

Recommended Posts

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.

Link to comment
https://www.sau.com.au/forums/topic/661-rb20det-vs-sr20det/
Share on other sites

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

Link to comment
https://www.sau.com.au/forums/topic/661-rb20det-vs-sr20det/#findComment-15326
Share on other sites

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... :P

Link to comment
https://www.sau.com.au/forums/topic/661-rb20det-vs-sr20det/#findComment-15336
Share on other sites

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

Link to comment
https://www.sau.com.au/forums/topic/661-rb20det-vs-sr20det/#findComment-15338
Share on other sites

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?

Link to comment
https://www.sau.com.au/forums/topic/661-rb20det-vs-sr20det/#findComment-15446
Share on other sites

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

Link to comment
https://www.sau.com.au/forums/topic/661-rb20det-vs-sr20det/#findComment-15936
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Turbo gods, some assistance and recommendations please I'm looking into a turbo kit for my 2.5 from MX5 Mania >>>>> https://mx5mania.com.au/products/copy-of-mx-5-nc-2-5-litre-engine-conversion-turbo-2005-2013 Power wise I would like about 200kw atw, and of course dose noises, apparently if you keep a stock 2.5 under around 200kwatw the engine will not hate life even when ragging on it a bit Max RPM on the 2.5 is around 6500rpm The turbo MX5 use is something around the disco potato size as  packaging room for the turbo is pretty limited, which will, I believe will give me my power goals and not have the turbo either under, or oversized, but the rear housing bit is confusing  It comes with either a 0.64 or 0.86 From my understanding, which so far is based off googling, so make of that what you will 0.64: spools faster = good Makes more EGT heat on boost = bad Less topend power than 0.86 = I'm only looking for 200 atw so that point may be mute????, I don't know, hence my questions  0.86: Spools a "little" slower = how much slower??? remembering 6500 is my max rpm Makes less EGT heat = good Makes a little more power up top = again, power goals is only around 200 Also, this is a street car, so there will not really be any long track sessions, in saying this I would want it so it was happy with at least 3 hot laps at Wakefield Park if the need arises  I already have a fancy pants triple pass radiator, and a oil cooler with thermostat will be getting installed as well Thanks for any information or recommendations you have 👍, and of course, the comments about me wasting money on drive in drive out modifications, or any other snide remarks about my manhood for owning a MX5 🤣    
    • Tape some wool onto the vent then take it for a drive I did this to my reverse cowl and was instantly unhappy, as anything over about 60kph would have the wool enter the engine bay, thus just adding underbonnet pressure and stooging my coolant stack, it did let alot of heat out when stationary though, which really didn't help once the car was moving, with the reverse cowl you could watch the coolant temps cheap up the faster you went on the hwy, I assume it would be alot worse doing track day speed With the vented bonnet (just after the radiator and about 1/3 up the bonnet) on my old R33 the wool on the leading edge sat at about a 45° angle as air poured out of it From looking where your vents are, and their size, I believe you should be fine at speed and air should be evacuated from the engine bay, I think it will be a night and day difference when stuck in traffic though for removing the trapped heat, and not sitting there cooking when parked up after driving around... #convection  Post wool tuft pics and data for science  This beastie is one nice and unique rig, enjoy
    • It is possible to do this stuff for "cheap". But you need to be able to get deals on all the bigger items, and it really helps if you're fully capable of doing your own work. As soon as you're paying retail for new parts, or buying "kits" because you can't fabricate necessary bits and pieces, and if you really need someone else to take the reins of doing the work because you don't have the space/time/skills/confidence to  rip deep into the car and put it back together in a working fashions.....then you pay. And these days, pay means a lot of money. You'd think things would get cheaper, but they don't. They just seem to keep getting more and more expensive.
    • It’s almost the price of an engine build, you won’t have anything to bolt onto it though 
    • Hopefully it's enough to help with the temps! I was also only shit stirring, regarding Murphy's Law basically. I've found, what ever spare parts I have, are the parts I don't break. Ever. Also have never had issues with oil/spinning bearings until I put oil pressure gauges on the car. 😛
×
×
  • Create New...