Jump to content
SAU Community

Recommended Posts

noone cares about lag when you have a good power range....

this is a rb20, they love to rev so he will be able to rev from 4500-8500

thats like having a rb25 that comes on at 3500-7500

If it makes anywhere near its peak power by 4500rpm i'll be very surprised.

More into the 5000rpm's which is cutting back useable power.

Late RPM does matter in a street car, and plenty of people care about it.

In a track car it doesnt matter. Who wants to have to launch a car @ silly rpm's just to get the thing moving because if you launch sanely you'll wait for power forever.

Good luck Grim32, waiting to see the results as its something no-one has done at this stage it seems :cheers:

  • Replies 55
  • Created
  • Last Reply

Top Posters In This Topic

Top Posters In This Topic

Posted Images

Have the exhaust and wastegate pipes done now, so its time to start putting it all together after a real good clean of the pipes. Got the heat wrap for the manifold and im having a bit of trouble with it but im sure ill work it out. Still a few small things need to be done but im confident ill have it to turn key stage by the weekend.

post-21010-1141705839.jpgpost-21010-1141705946.jpg

Well worked on it all weekend and just went for the first drive. It feels great off boost, i didnt drive it to hard but gave it a quick stab here and there, it pulls pretty hard at 4000rpm so im pretty happy with the response but i only reved it to about 5000rpm and cant see why it wont keep pulling right through the rev range. Battery is stuffed in the car so its time for a new one, then off to the dyno this saturday coming at 10am for a tune.

post-21010-1142156759.jpgpost-21010-1142156851.jpgpost-21010-1142156957.jpg

Ok just had the tune done, the only thing i was a bit disapointed with was the paper saying 203kw, but im not to worried after driving the car. The dyno is known to read quite low. Boost starts at 3000rpm, 15psi by 3500rpm and full boost at 4000rpm, it pulls hard all the way to 7000rpm where the power just starts to drop off. This is running 22psi, at 23 it made 210kw but the GTR injectors were at 98% duty cycle so we backed it off a touch, this shows the turbo isnt at its limits yet.

It gets a bit of wheelspin halfway through first gear and into second, blink and its time for third where it has full traction. Im so happy with how it drives and with the power delivery, it doesnt lag then come on like a switch. I think this is a great turbo for the RB20.

I will take it to the next dyno day to see what power readings it will get but at the end of the day if it still says 203kw ill be happy with it. My tuner said with traction and a ok driver it should run 12.3, 12.4 down the quarter.

post-21010-1142656707.jpg

Congrats on a fine result , many would probably agree that the RB20DET is difficult to get good responsive power from particularly from under ~ 4000 rpm to over 7 .

That GT3071R happens to be a very good match ie 71mm GT35 comp with 60mm GT30 turbine . In theory both the turbine and compressor run out of puff in the 450-480 Hp range (assumes 1.06 exhaust housing) . The turbine would go a little further than the comnpressor which is as it should be . I imagine you are running the .63AR Garrett T3 flanged housing on yours ?

These would be an interesting turbo for RB20's with the 52 trim comp as well (56T is std) , it would be sort of similar to some versions of the HKS GT2835 but with the unmolested GT30 turbine . My orphan opinion is that this is the propper way to go rather than bigger compressor with GT28 turbine ie GT2871R 52T/GT-RS or 56T . A GT3071R would not be difficult to build from a GT2871R in any of the three trims . If a GT30 turbine was exchanged with 2871's GT28 turbine (identical GT25 centre section bearing/housing/shaft dimensions) you end up with the same thing except your choise of compressor . The same thing could be done to a GT3071R WG to fix its woes .

The tune should have made the car feel much better down low than std , the extra timing these can use when un corked should make a marked difference to the low speed torque . Im wondering if it could use the next taller 4.1 final drive to take advantage of the extra torque and give the turbo a little more load to push against .

Before I go the cartridge no. on that turbo should be 700177-23 , if so its a rare bird in Australia - for the moment ....

Cheers Adrian .

post-9594-1142671236.jpg

Congrats on a fine result , many would probably agree that the RB20DET is difficult to get good responsive power from particularly from under ~ 4000 rpm to over 7 .

That GT3071R happens to be a very good match ie 71mm GT35 comp with 60mm GT30 turbine . In theory both the turbine and compressor run out of puff in the 450-480 Hp range (assumes 1.06 exhaust housing) . The turbine would go a little further than the comnpressor which is as it should be . I imagine you are running the .63AR Garrett T3 flanged housing on yours ?

These would be an interesting turbo for RB20's with the 52 trim comp as well (56T is std) , it would be sort of similar to some versions of the HKS GT2835 but with the unmolested GT30 turbine . My orphan opinion is that this is the propper way to go rather than bigger compressor with GT28 turbine ie GT2871R 52T/GT-RS or 56T . A GT3071R would not be difficult to build from a GT2871R in any of the three trims . If a GT30 turbine was exchanged with 2871's GT28 turbine (identical GT25 centre section bearing/housing/shaft dimensions) you end up with the same thing except your choise of compressor . The same thing could be done to a GT3071R WG to fix its woes .

The tune should have made the car feel much better down low than std , the extra timing these can use when un corked should make a marked difference to the low speed torque . Im wondering if it could use the next taller 4.1 final drive to take advantage of the extra torque and give the turbo a little more load to push against .

Before I go the cartridge no. on that turbo should be 700177-23 , if so its a rare bird in Australia - for the moment ....

Cheers Adrian .

Thanks mate, yeah the cartridge no. is 700177-5023. It would be interesting to change the diff gears to see how it goes but im stoked with how the car runs and responds at the moment so ill leave it alone for now. And yep its a .63ar rear.

hmm strange you shuld have got more power than that ...

i had a similar setup on my rb20 and got 254rwkw at 19psi with all standard internals etc :mad:

I did expect to see a bit more power out of it, but at the end of the day its only a piece of paper with a number on it. My tuner said another car that made the same power as mine went to a dyno day and rolled off with 247kw, thats 44kw difference between dynos.

Do you plan on running down the quarter anytime soon?

Did you look at your new graph compared to your old with T3/T4? They are pretty much identical including the shape of curve which amazed me.

Both your posted results are non shootout mode which is all I can suggest as to why you havent made "dyno" power as expected. You made 190 with a T3/T4 which although there are a million variables the mean average for even the worst dogs of versions is a lot more than 190 when using 22psi. My dyno figure is over 280rwkw with a version of a t3/t4 with 22psi.

So to match the responce with a larger turbo says a lot to me as I have always had my eyes open for a more modern turbo than my 1987 piece of junk but honestly havent seen anything that could possibly match the power of my current one but have an earlier boost threshold. Even Roys trust unit, there is nothing I have seen in ballbearing that buries it in the darkages like is assumed.

I will have a keen eye as to your outcomes grim. Well done for going out on a limb.

I actually just put both graphs side by side, at a quick glance they look the same, but you can see the new one has more torque and power everywhere. Ive got a small clutch fluid leak to fix and then its off to the track.

nice setup, would have expected more power too but i suppose its only a dyno. What sort of manifold and wastegate did u use? Also did you think about running a gt35r with a small exh housing?

Hi, its just a cheap ebay manifold and a 35mm xspower wastegate, it holds boost well but. I didnt even think about the gt35r when picking the turbo, someone suggested a 30/40 but after 3 months of research and talking to people, and looking through catalogs i just went with the 3071.

Ok i didnt sleep well last night thinking about the car, how could i be maxing out gtr injectors at 203kw when using a good pump 2;1 reg with heaps of pressure unless the afr are all over the place. Just went for a power run on a local dyno that is said to be quite accurate and here are the results.

please comment on afr, would you leave the tune alone and be happy or have it looked at by someone else. The car drives great, little hard to start when hot and uses heaps of fuel.

Thanks guys.

post-21010-1142821963.jpg

Im no tuner...but i would think the tune could be a bit nicer then that. Im running the same injectors as you, making a bit more power, and im nowhere near the duty cycle your running and i dont have an aftermarket fuel reg.

I know my tune is leaner and still very safe, as i have driven the wheels off the thing on the track and it never pings and is still a healthy engine.

HArder look at the tune me thinks...and also can you give a detailed list of all the mods...What boost is the above plot

walbro pump, malpassi 2:1 reg, gtr injectors

600-300-76 hybrid cooler, k&n pod

high mount manifold, 35mm wastegate, gt3071r turbo

3" turbo back exhaust, no cat, cannon on rear no silencer, 2" wastegate pipe plumbed in just before cat

wolf 3d with ebc

splitfire coils

7 heatrange plugs gapped to .6

when tuned boost was set at 22psi, today it was showing 25psi by the dyno, i havent looked at the gauge when driving for abvious reasons

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

    • Yep, yeah would need to do the flywheel although the 6 bolt NA clutch can handle a 20de if just wants to replace the stocker.
    • No it's fine. Heat sleeve is a thing. With oil running through it it is unlikely. Engine off heat soak can be a thing though. There is no way that you have a leak through the hose. That has pressure behind it and any small hole will turn into a large one in very short order. It is so much more likely to be leaking from the connection.
    • Really? That's piss weak. I didn't know they hobbled the shitboxen that badly. OK. So probs need to buy a flywheel too. But that's not too bad.
    • Hi all. I already posted some newbie-ish questions here and there but this will be my first "big" post. Last summer I went and fulfilled a kind of childhood wish, because I just thought I needed this experience in my life no matter what. The car I bought is a mildly modded 1995 BCNR33 Vspec. It was repainted to a metallic orange color all around and it had all windows reseated. Not so well done black respray in the trunk and a metallic black in the engine bay. From outside it looks very nice except for a minor paint error on the roof and the rear spats needing new adhesive tape. The inside is pretty clean and no broken plastics, missing or faded buttons. Even the adjustable mirrors and trunk antenna work like a charm. Despite a moderately long list of issues I don't (yet) regret buying this car. Most mechanical problems are just due to age, like worn rubbers here and there. The underside sadly has lots of corrosion, especially to the back. It looks like it either has been driven in the winter for a while or it lived near the saltwater in Japan, the rust is nothing terrible but it'll require to be looked after. Mostly panel gaps and all the mounted components underneath are a bit crusty, but I don't think anywhere has progressed so badly that there's going to be holes. Front right jacking rail is crushed and needs some care so it doesn't develop into a rust crater at some point. Worst part is definitely the strut towers. I thought they looked fine but after taking off the strut bar I noticed that it actually started bulging up on the passenger side. Probably would have passed on the car or negotiated down by some thousand Euros more if I had noticed this before buying, but here we are. Trunk area also has signs that there was a water leak to the interior once but nothing too crazy, I guess lots of Skylines had this at some point. As for the list of (known) issues, I'll try to make this compact. I hope the coloring is self explanatory. Mechanical: -Various busted or soon-to-be busted rubber bushings and ball joints. Will replace ball joints with OEM or better and bushings with polyurethane where possible. -Shaking steering wheel at above 80kph -downshift from 5th to 4th is a bit crunchy unless I rev-match, might just try to renew the shifter assembly, but it's not a priority issue -tailshaft centre bearing could use a replacement, is it worth going 1-piece tailshaft as it doesn't look too fresh all around? Chassis: -underbody corrosion on many spots and in hollow spaces, needs to be treated -corrosion on many bolts, hoses, lines, suspension components, subframes, will be treated when replacing of the bushings is needed as time goes on -strut tower top panels and some of the surrounding panels are rusty, so needs fixing. Will look into doing this with a buddy in the winter, otherwise bite the bullet and pay a professional -driver side door is misaligned to the body and needs to go a slight bit more inwards -both door windows are misaligned and have an airgap where the window meets the door at the B pillar -The Aerocatch latches for the bonnet have locks but no keys, need new keys. -driver side door window is kind of gritty and could use a polish -damaged jacking rails and front frame rails, from people lifting the car the wrong way, might have this fixed by a bodyshop Electrical: -Nismo tachometer is just bouncing and displaying nonsense, supposedly worked fine when the stock ECU was still in the car -An old Greddy boost controller sits on the dash which will be removed as it servers no purpose anymore. -a led segment rpm gauge is on the steering column, will probably also be (re-)moved once the Nismo tacho is working correctly -there was an attempt to make the sound system better by the previous owner but it was just inducing noise all the time, ripped out the amp and filters in the back, no music for now -trunk antenna goes up as long as the radio is on regardless of the mode, I want it to only rise if I choose Radio specifically or per switch -3rd brake light is a bit dimmer than the taillights but everything was converted to LEDs so mabye now it just seems dimmer? -reverse light flickers, have to test if that behavior changes when I fiddle with the gear stick. Hope I can get around changing the switch. -Left side taillight, blinker section has minor water intake and is humid after washing. Other side has a hole in it, probably for that exact reason. I'll probably reseal them entirely and plug the holes. Engine: -minor coolant drips on one or the other hose -rear turbo leaks oil onto the exhaust making the car essentially undriveable due to fire hazard -Oil filter relocation kit has an oil drip at the Dash lines, will probably make a new connection there and tighten real good and pray -throttle body assembly is slightly stuck for the first throttle pedal input after sitting for a while I'm always open to suggestions and advice from more experienced people, I'm sure half of this list is easily dealt with and just requires some time and effort to sort out properly. Once I have some proper pictures of the car I will post some in this thread, I just have to remember to take some more once I get the chance to. Will post updates when I have news on anything, I want to try to keep this thread as kind of a logbook as well. Ultimately my goal for this car is to just enjoy it. An engine rebuild is probably going to happen sometime as well, because it is old after all. It will never be fully new again, I am just not that rich. But I want it to look good, work well and not rot away while I drive it. I'm probably gonna spend a lot of money on this journey, hopefully not an unreasonable amount.
    • Hi all. So one of my major issues at the moment is my rear turbo leaking oil on the exhaust (and the general area). I presumed it was the rock hard super old drain hose, which it was not. So now I am in the midst of removing the rear turbo to get access to the banjo bolt that goes into the turbo oil feed. As one of the previous owners accidentally? tore off the OEM oil feed hardline that reaches behind the turbo, they ran braided lines directly to the turbo, presumably PTFE. Now, regardless if the line has rubber or teflon inside, is it just generally a bad idea to do this? I imagine these lines get quite hot being between the engine, turbo core and exhaust manifold. I suppose it's not too far fetched to think the line may even have melted. I'd love to hear your opinions on this as as the replacement OEM hardline piece is 130 per unit. And cutting open the currently mounted line to see inside will mean I just have to get a replacement either way. So far I am hoping maybe the bolt just loosened or (god forbid) they forgot one of the crush washers.
×
×
  • Create New...