Rb20 Isnt Tuned

[Barrellboy]

Hey,

I bought a 98 r32gtst a month ago as it drives like a new car beautiful tight shifting no dents at all perfect original interior everything is still rigid good smooth motor.

It has a front mount, podfilter, 3.5inch catback, per4manz highflow turbo from perth a while ago with garret guts and bush bearings, it reads 15 psi full boost. The only thing im a bit worried about is that it isnt tuned at all!!!!! it runs smooth and everything but exhausts some black smoke when i spool it so i guess its rich, but its not tuned??? i thougt it would run lean with a turbo upgrade.. plus its real laggy do you think thats because of the stock down pipe + non ball bearing turb + plus big intercooler + rb20 ?

the other question would a tune make it spool earlier? it pulls at 4.5k i raced a standard r33 the other day and it only just beat me would a tune make it less laggy and alot faster? coz it still lost to a standard 33 with all my upgardes...? cheers

[Brett_J]

Was it advertised as tuned/having a ecu or remap?

[GTSBoy]

Big turbo = lag on a 2litre.

Upgraded fuel pump can help to prevent leaning out - the basic maps are richer than desirable at high load, it's just the old stock fuel pumps that can't keep up. Generally, unless it is a big build, you take fuel OUT of the top end when tuning an RB.

[Barrellboy]

it wasnt advertised as being tuned, i just think its good because its smooth and still new inside out, is a rb25 highflow considered big? do you think im okay to keep running 15psi with this non tuned set up doesnt overheat or sttutter or anything.

[Barrellboy]

and is it worth it to get it tuned? would it make a big difference?

[Brett_J]

Got the ad for the car or anything?

[Barrellboy]

no, why would you want the ad?

[Brett_J]

I might know the car, that's all.

[joe blo]

rb25 highflow is a pretty big unit for a rb20. i have a vg30 turbo on mine (similar size to rb25 neo turbo) and full boost on thats about 4500. so expect that or worse.

[GTSBoy]

it wasnt advertised as being tuned, i just think its good because its smooth and still new inside out, is a rb25 highflow considered big? do you think im okay to keep running 15psi with this non tuned set up doesnt overheat or sttutter or anything.

Why would you expect it to "stutter" anyway. There are three things that can be wrong with the tune on a stock motor that is boosted up;

1) Stock maps too rich = less power than ideal, black smoke and fast dropping fuel gauge.

2) Run out of injector = possibly goes lean at peak torque rpm and above. Car will feel fast, no black smoke but may start pinging. Pinging may be inaudible but still cause damage.

3) Timing maps not optimised. If stock, they're probably too soft anyway, unless perchance it's running lean enough to cause you trouble, see 2) above.

So, in all of that, there's no "stutter". There's either runs real nice, runs real nice with smoke, or runs real nice with possible invisible engine damage occurring.

It would be smart to put it on a dyno with a wideband and knock ears connected and see which of those above are the actual case, no?

[Barrellboy]

okay cheers, a mate was driving behind me and said it pisses black smoke when it hits full boost at 4.5k so it must be rich would a tune make it much quicker? its just a tad slower than a stock r33 so im guessing with weight factored in it would be like 160kw?? what could i maybe get with a decent tune at allstar garage in perth or something like that... i know nothing about tuning.

[Barrellboy]

if a rb25 highflow is big for a rb20 why is it still slower than a stock 33 and only 150 - 160ish kw ?

[GTSBoy]

It's slow because it's taking forever to come on boost and running too rich. An R33 highflow on RB20 should be up above 180rwkW, probably pushingover 200 depending on the exact nature of the turbo (and assuming that there is sufficient injector).

I made 170rwkW (or thereabouts) on a stock RB20 turbo just with the usual minimal mods.....big exhaust, FMIC, decent intake to and from stock airbox and Nistuned ECU. The only thing holding me back from making more was that injectors were at 100%, AFM was pretty well on 100%, turbo was at 14 psi, so nothing really left in that either. Needed upgrades to all these before being able to get any more power.

[Barrellboy]

so if i got it nistuned i could see roughly 250kw?? hahaha even when i hit boost he still could just pull away from me justtt

[joe blo]

depending on how big the highflow is will dictate how much power it can produce

[Barrellboy]

okay thanks

[Kane_R32]

R33 Highflow + Nistune + Supporting Mods, I would think you'd see around 190-220rwkw +/- 5-10rwkw depend on health of the RB20 and tune...

I didnt know they were really laggy?

Add some adjustable cam gears..

[NYTSKY]

98 R32??

[GTSBoy]

98 R32??

You saw that too, did you? I let it pass.

[iruvyouskyrine]

Was probably imported in 98 and says it in the compliance plate. On mine it says "Manufactured by *importers name* in 1998"