SR20 vs RB25

[Pigpen]

Hi there,

 

Looking for some opinions for engine swaps.

 

After some soul searching I have changed the original idea of a VG30DETT for something a little easier to fit.

 

I have seen both conversions and I am keeping in mind that I want to keep an aircon setup in place.

 

Given that I probably need to start pretty stoke to get past engineering and money will be tight for a while (meaning little to no upgrades) what do you think ... [glow=red,2,300]SR20SET vs RB25DET?[/glow] I am leaning towards the RB as I can get prefabed mounts etc, not that I don't have the skills to create them.

 

Please let me know pros and cons - especially if you have done the conversion.

 

Cheers

[C.A.R.]

Firstly, FILL IN YOUR LOCATION!

 

Secondly, you do realize your looking at the best part of 5-6k for the conversion for either engines?

And the SR20det will have SFA torque compared to a larger capacity 6cyl engine.

[Robstar]

V12 or bust!

[gav240z]

Firstly, FILL IN YOUR LOCATION!

 

Secondly, you do realize your looking at the best part of 5-6k for the conversion for either engines?

And the SR20det will have SFA torque compared to a larger capacity 6cyl engine.

 

What Lurch is trying to say is, your location will help us to know what costs are involved as this can have an impact on cost. We have some overseas members so its not safe to assume you are in Australia.

 

Both engines can achieve big power but will give the car quite different characteristics in terms of power delivery. An Sr20 will have an impact on the way the car handles as it's quite light and will tuck behind the front crossmember.

[Robstar]

If I really had to add my two cents, I don't think I could.

 

A 4-banger vs Straight-6? It's not really fair after a certain amount of 'tuning'. Go for the RB26DETT.

[RBZ 260]

sr20det vs rb25det

 

well being the nissan freak expecialy modern ones driven countless skylines and silvias/180sx/200sx

 

i will anyday go for the sr20det... sorry for the RB fans... though my z has a RB20det and its brilliant in the 260z. but i wished i went for the sr20det.

 

they have fair bit of torque (and u dont need it in a car that has 1000kg, unless u building a burnout machine) but its the weight of the engine that saves lots.... including fuel (and lets not say nobody complained about consumption or fuel prices, cause ur kidding ur self), rego etc....

 

as gav said sr20det fits behind the cross member and u need to fabricate some brackets which in your case doesnt seem to be an issue. as far as i know thats pretty much the main issue..

 

with RB u have to rotate the sump and change the oil pick up from z31 200zr. u could also buy the sump of the same car but it will cost you a small fortune approx $550 from nissan. otherwise choping the original and rotating it will cost money if u paying someone to do it.

 

than there is the issue of gearbox mount if u preffer to stick the engine as close to the firewall as possible.

 

y i chose rb20det instead of sr20det or rb25det, it was $$$$

 

my rb front cut cost me 1300 with brakes  and bigger turbo. at the time

Sr20det engine only was approx 3.5k for red and 4.5k for black plus anotehr 500 for other bits to get it running

and rb25det were 4.5k to 6k for neo.

 

performance between all this engines in stock form in a zed would be similar if not in favour for the sr20det for its weight advantage.

 

though my ultimate mod for s30 would be rb26dett if i could afford one.

 

than again whats the point of having 300kw+ and 600nm of tourque if u cant put it down.

 

 

 

 

 

 

 

 

 

[Pigpen]

OOOpppsss sorry guys ... I am in Penrith NSW.

 

I think the plan will be to pick up a panel wrecked car, probably RB25 R32 Skyline.

 

I have seen a few of these going for around the 3k mark. That should give me all the goods to get through certification.

 

Is it true that the RB will not require custom tailshaft??

[sco_aus]

Not that I know of. So have you been to see Costa in Castlereigh then?  I dont like his prices or attitude, but he does have a few good things lying around (eg, i got my Z from him )

[PZG302]

Not that I know of. So have you been to see Costa in Castlereigh then?  I dont like his prices or attitude, but he does have a few good things lying around (eg, i got my Z from him )

 

I assume that would be Z Bits at Castelreigh, and the owner is Carlos.

 

Also Z16 at Marayong may still have some bits and pieces around as they have moved into general servicing and trucks as not a lot of money in the old school Z's and 1600's

[sco_aus]

Yeh thats him

Well in regards to the whole topic, im gonna say cos im biased, RB25 FTW. SR20 is great weight distribution and all, but then again, my RB25 doesnt weigh much different to the L series and you look at how many good handling L series cars there around and have been over the years.  If your going to do track, definately RB.  SR would be better for small tight driving where not as much speed is needed like motorkhana etc.  As for Hillclimbs, I reckon they both have big advantages.

[Pigpen]

Yeah, I know Carlos ... I actually sold him my last real project car (1600 wagon).

 

He can be a little bit precious sometimes, but you take what you can get sometimes.

 

I think I am pretty sold on the idea of an RB25 conversion ... time will tell. I think I will do the body first and figure out the rest as I go.

[Robstar]

Yeah, I know Carlos ... I actually sold him my last real project car (1600 wagon).

 

He can be a little bit precious sometimes, but you take what you can get sometimes.

 

I think I am pretty sold on the idea of an RB25 conversion ... time will tell. I think I will do the body first and figure out the rest as I go.

You could always go the VH route, get a half-cut for around 1-1.5k.

[cRAYzed]

 

i will anyday go for the sr20det... sorry for the RB fans... though my z has a RB20det and its brilliant in the 260z. but i wished i went for the sr20det.

 

as gav said sr20det fits behind the cross member and u need to fabricate some brackets which in your case doesnt seem to be an issue. as far as i know thats pretty much the main issue..

 

with RB u have to rotate the sump and change the oil pick up from z31 200zr. u could also buy the sump of the same car but it will cost you a small fortune approx $550 from nissan. otherwise choping the original and rotating it will cost money if u paying someone to do it.

 

than there is the issue of gearbox mount if u preffer to stick the engine as close to the firewall as possible.

 

 

 

 

Hi Im just wondering which of the two engines is most cost effective and easier??

Which engine is easiest with gearbox/tailshaft connection?? Do both engines and their gearboxes connect up with the stock 240/260 tailshaft and diff or do you need to customize these to suit??

Sorry if these are noob questions, but I am a noob!!

Thanks

-Ray

[RBZ 260]

yeah most likely u need to make up a tailshaft with either the SR or RB. all depends how far you push the engine towards the firewall.

 

with SR prob got to spend more time making the engine brackets to match up to the subframe.

 

with rb u can get away using r32 skyline items but u need to change that sump orientationwhich does cost a bit of $$ if buying new from nissan.

 

than again a stock tailshaft and universal prob wont cope with the turbo engine. turbo universals are about twice as big as the stock tailshaft universals so u probably need to change it or risk breakages.

 

whats more cost effective depending on the price of the package you can pick up. i think SR20det are bit more pricey than the RB20det. RB25det are slightly more expensive than the SR20det main cause probably of the stronger gbox behind the RB25det.  which alone can fetch up to 1500.

 

With sr you save on the sump hassles but that will get eaten up by the time u make suitable engine brackets.

 

in another words prob cost you the same to install either engine. its the initial price u pay for it that will save you few $. i paid for my rb20det front cut $1300. sr20 at the time engine alone was $2.5k. bit of saving.

 

 

[cRAYzed]

mmmm I see... There are a couple examples of 260 gearboxes with R32 internals... Im assuming the stock gearbox cannot mate up with other engines? Eg SR, RB??

Seems the easiest option might be to boost the stock engines? Only prob may be the stock gearbox and diff breaking under the pressure?

Thanks for you help RB!!

 

edit : also seen examples of FJ20 turbo gboxes mated to the L26 engine.. Wondering what other gearbox options there are...