Remap After Boost Increase?

[Falco1992]

Hey guys I recently bought myself a r32 gtr with some mods already done to it such as 550cc injectors, full 3 inch exhaust, hks induction kit, boost controller and some other stuff.

it's got stock ceramic turbo's but has been dyno-ed and mapped by RisingSunPerformance (14,5psi) 408,3 HP @ 1 bar of boost

Considering it's going to be used for track days, I dont think the ceramic turbine will last long at 1 bar of boost, so I'm thinking about rebuilding it with steel internals.

But do I need a remap again if I want to run 1,2 bar of boost?

[R.3.2.G.T.R]

u sure bout the power figure, that around 300kw on 1 bar.. not on stock turbo thats for sure.. dont bother increasing boost on stock turbo unless you feel like rebuilding the engine soon

[Falco1992]

Ive got a dyno read out so pretty sure it is

[R.3.2.G.T.R]

no one is making 300kw on 1bar boost on gtr twins.. post up ur dyno chart if u wish or look at rb26 dyno thread for confirmation.. in any case unless its steel wheel u dont want to be increasing boost

[Falco1992]

I just got the car 2 days ago, I got lots of paperwork including receipt from RSP

anyway here it is

speclist far as I know

HKS mushroom filters

Toad alarm system

Nismo lower strutbrace

Poly bushed upper mounts

Rising Sun Performance custom chip

Bilstein dampers

splitfire coilpacks

Denso purple top 550cc injectors

steel braided brake hoses

engine brace

Greddy PRofec B spec-II boostcontroller

3 inch full exhaust

Havent checked the turbo's yet so it may be upgraded ones,

[Torques]

Back to the original question ...

That depends.

If you want to run much more boost, the old mapping might run out of it's load scale.

Meaning the ECU uses the last 'known' 'cell' for ignition and fuelling which might lead to knock or/and lean mixture.

Sounds quite technical .. so in your case I'd say 'yes' ... remap!

[Torques]

As for the Dyno ..

That is 'at the clutch' not rear wheel.

So maybe 260KW at the rear?

[R.3.2.G.T.R]

u better off getting an aftermarket ecu if u plan on further mods.. a chipped ecu will need to be re-flased each time you make significant changes..

if u handy with a spanner, take off your induction kit and see if can get a better look at the front turbo, maybe able to identify the turbo

also re: dyno graph, do u have one showing what boost was being run.. u based in the uk??

[Falco1992]

No I'm from Holland, I was told by the previous owner (from UK) the 408hp was at 1 bar of boost, and he got me another dyno read out (345hp or so) wich believed to be at .75 bar of boost.

I will take a look at the turbo's tomorrow,

as for the boost. If i find out it's just stock turbo's then I think the best way is just get them rebuilt with steel internals and not go further than 1 bar.

[jrm]

Never quite understood anyone who would tune on S_HP when it's a calculated 'guess' as to the clutch power - rather than a 'real' figure at the wheels ..

I guess it makes the owner happy, but beyond that?

[MrStabby]

If you can, take it to a local dyno and get them to give it a run. Also get a copy of the boost plot - we should be able to tell from that if its got standard turbos or not.

[Harey]

Always a good idea to get the ecu remapped or at least checked when you up the boost. I increased my mid range by 2psi and when I took it in the tuner said it was pinging heavily and that it was good I brought it in. $2-400 to ensure everythings ok is cheap compared to the alternatives if something goes wrong.

[Thelen]

You can get 300KW from the stock twins, but only with a tonne of supporting mods such that you only run 1 bar at most, which isn't the case so definitely you'll want to get a proper ECU if you plan to up to 1.2, and you'll be a lot safer with what you have now with a proper map.

[R.3.2.G.T.R]

You can get 300KW from the stock twins, but only with a tonne of supporting mods such that you only run 1 bar at most, which isn't the case so definitely you'll want to get a proper ECU if you plan to up to 1.2, and you'll be a lot safer with what you have now with a proper map.

all the supporting mods wont change the fact stock turbo will still need more than 1bar boost to see anywhere close to 300kw.. 1.2/1.3 bar will see it coming close, hell u could up it to 1.5 bar and have it running with little more gain

[Torques]

A valid point,

HP and 'at the clutch' makes for big figures ...

On the other side, I see a lot of dyno graphs form OZ with speed in km/h on the X-Axes.

I really don't understand what this is for since I'm interested in at what rpm the engine makes

what power/boost.

Cheers from London ...

Never quite understood anyone who would tune on S_HP when it's a calculated 'guess' as to the clutch power - rather than a 'real' figure at the wheels ..

I guess it makes the owner happy, but beyond that?