High stall.

[Farkurnell]

Just bought this MX10 last week. It's got an...( purists look away) ... RB20 in it and a Japco 3 speed auto box that has been semi-auto'd. It shifts beautifully when using it as a manual. By the feel of it it has a stock converter in it. It's a real slug off the start, even stalling it up as much (which isn't much) as it can. What I'd like to do is put a high stall converter in it, maybe 3,000 or so. My question is, what's the best place to source a converter? Just go to an Automatic specialist or is there some Jap performance place I could go talk to them about it?
Somewhere in Sydney would be preferable.

Please don't suggest changing to a manual. I have the other Corona with a manual and I'd like to get a lot out of the auto if I can.



Sorry, just realised this should have gone in Tech and Conversions I suppose.



Cheers,Greg.

[puzzle man]

Geee Greg, you go through more cars than Rod
sorry i cat help but there was a really good automatic specialist on Hoxton park road that my dad sent me to.
its in the some complex as weston pet foods one.

[jimmmayyy]

the auto would be a JATCO, and the stock stall in jatco's is 2800. they're fairly fine behind an RB30, but the lack of lowdown torque from the RB20 might be magnifying it's sluggishness. KEAS automatics specialize in modified jatco's, but really i'd be looking at a bigger bottom end before anything like that, the RB20is never gonna be able to put down power well through an auto.

[jimmmayyy]

no worries mate, actually if you jump on calaisturbo.com.au you might be able to pick up a modified jatco fairly cheap.

is it a red top or a black top RB20?

[Farkurnell]

It's a red top.

I don't really want to change or do much to the actual engine itself other than maybe a bigger turbo at some stage. I'd really like to squeeze as much power out of it as I can with simple bolt ons if at all possible. I know nothing about the Nissan engines so I'm flying blind, so to speak.
The converter in it ( I don't have a clue what sort) doesn't take much stalling, it starts moving forward at about 2,000 and then the wheels spin.
There's a 3200 converter on calaisturbo for $300. Do you reckon it'd help at all?
As I said, it already has been manualised and shifts through the gears quickly and faultlessly without losing revs. It's just the launch that holds it back.


Cheers,Greg.

[big_zop]

While i dont know much about autos or Nissans either, i have a few articles on the RB20 that i can put up once i find them again (just moved house).

One is on a R31 wagon that featured in Zoom a long while back - got 220rwkW on the cheap with auto (before going manual and gaining 25!) - should have a summary so wont be too big.

Another was the HPI R32 4 door - and while that was meant to house their big build RB24 they came to the conclusion that the amount of money spend on the build could have bought 2-3 RB25s which they could have swapped in when the last broke and given similar power (probably a bit too much to put up but can lend you the mags if youre interested)

Let me know what youre specifically interested in and ill see what i find, things that come to mind are:
- twin cam head on RB30 bottom end
- RB20 tuners guide
- RB25 tuners guide

[jimmmayyy]

ok, if it's a red top RB20, then your kind of pushing shit up a hill. the early ones ran a different computer called NICS, which is a major hindrance, especially compared to the later ECCS blacktops. if you really want to make decent reliable power, ditch the factory NICS computer straight away. the turbo is different and the head is also different, ie it flows less. a stock NICS motor would only make somewhere around 90-100rwkw, so thats part of your sluggishness problem. with a larger turbo you might make about 140-150rwkw at MOST.

however, for the same amount of money changing all of that, you could have a stock 9:1 n/a RB30 bottom end with a twin cam RB25 head on it running on a stock 25 computer that will easily put down 180rwkw. in my opinion, don't even bother with the NICS RB20.

-jimmy

[Farkurnell]

BZ, I just want to get as much out of the RB20 as I can. The tuners guide would be good.


Jimmy it's already got an EMS Stinger ECU. Surely something can be done to get more neddys out of it.

[jimmmayyy]

fair enough, just the usuals then larger turbo (like a VG30 single or RB25 turbo) exhaust and cooler. you still won't get as much as you would out of a blacktop RB20. the early head really is that much more restrictive.

[Farkurnell]

So is the higher stall converter a good idea?
It's already got a cooler and 3 inch exhaust.
Does the RB25 turbo just bolt straight on?



Cheers,Greg.

[mr2gze]

.... the early head really is that much more restrictive.

From what I remember of the pics, this has a ECCS redtop? Greg?

[Farkurnell]

Ummm, I'm a bit shady on what it has got exactly. The seller is overseas, I dealt with the Father and I know bugger all about Nissans at the moment and I'm waiting to hear back from him about a couple of things that the old gray cells have forgotten since I bought it.

The photos have been removed. Can you tell from photos? I'll take some if you can.


Cheers,Greg.

[Dieseltrain]

The Red tops are pretty shagged nowadays as far as mods go... Head doesnt flow as good as its newer brother and the inlet manifold and ECU are a disaster.. Even with all the mods they struggle to break 120-130rwkw with a stock turbo and an auto...

CHeck out the R31 forums heaps of info there! My Dad used to own a R31 Passage GT pillarless 4 door... Hence i know a bit bout the Red top... Basically its a boat Anchor im fraid to say !

http://forum.r31skylineclub.com/

[lexsmaz]

Personally if it starts to move forward & then spins the wheels, do something about runing stickier & bigger tyres & a LSD if it hasn't one, it would seem from what you say that the low down power is ok, ( ie ; spining the wheels ) you just need to get the power down onto the road..
Bigger turbo is going to make it even more lagier off the mark ..
Similar effect with a higher stall, you will need to rev it more off the mark to get it to move off quickly, but that can help in that the turbo is going to spool up, but then you will really fry the tyres .....

[jimmmayyy]

the original turbo is a piece of shit. RB25 turbo is a good upgrade, it's slightly bigger but it will spool up faster. and yes, it will bolt straight on.

btw, post a pic of the engine bay. the NICS motors have finned rocker covers. there were early red top ECCS motors too, but they are not so common.

i wouldn't worry about the stall just yet.