Power Fc Required?

[PhilGTR]

Hey guys,

I just got my car back with new r34n1's fitted but i noticed that they are a lot laggier than the standard r32 turbos. Feels flatter and not as much power and doesnt come on boost fully till like 7k. Im still using stock ECU at the moment. Is the next best thing to do to get a power FC and get it tuned??

Also I was wondering if it is possible to get the standard ECU tuned to get a better power band? Current state of tune 3" cat back, apexi pods, bov and waiting for my front pipes and cat.

Can someone else give me some opinions apart from my mechanic recommending me to get a PFC and a tune?

Cheers

[32vspecII]

the r32 ecu can be remapped

much cheaper

[R32 GT-R]

While remapping the standard ecu will be cheaper getting power fc will save hassels in the long run as every time u add a new performance bit it is easily retuned to suit. Though if u plan to do little with the car in future getting the standard ecu remapped would be a better way to go.

[PhilGTR]

Thanks for that, but can the stock ECU get remapped so i can optimise these bigger turbs? As im not really going to do too much more to my car for a while. So I think remapping it would be a better option for me now.

Any ideas how much it would cost? and where is a reputable place to get this done in Sydney?

[R31Nismoid]

Personally go the PowerFC... even though re-mapping might be cheaper.

The PFC is always there, and it gives YOU in-cabin control of other stuff should you wanna change things on the fly

[itbmils]

PhilGTR

Sorry to take this in another direction – BUT - I must be missing something. The R34N1s are not that much bigger than the std R32s (are they ?)

I have an R32 GTR with R34N1s and I'm on full boost by like 3500rpm (well almost )

I do have a PFC now, but also ran them with a Blitz Access ECU and they were fine. I don't think the PFC will be make THAT much difference – I'm no expert tho

Do you know the A/R rating of your N1s - are they .48 (some are .60 or .64 too I think) ?

Sounds like there is more to your problem that the ECU to me (shrugs)

[itbmils]

Thanks for that, but can the stock ECU get remapped so i can optimise these bigger turbs? As im not really going to do too much more to my car for a while. So I think remapping it would be a better option for me now.

Any ideas how much it would cost? and where is a reputable place to get this done in Sydney? 

<{POST_SNAPBACK}>

you could also try looking for a remaped ECU on ebay - I just sold my old Blitz ECU to some guy in the US for example

[PhilGTR]

you could also try looking for a remaped ECU on ebay - I just sold my old Blitz ECU to some guy in the US for example

<{POST_SNAPBACK}>

I was told that the r34N1's are between the HKS GTss and 2530's in size. Hmm im not sure of the A/R rating i will have to check.

I mean it probably does come on full boost at around 4k or so, but it just feels like a long flat spot from 3k all the way to 6k. on my old turbos its like a bit flat from 3k-around 5.5-6k then i feel a bit more in 1st. But now it feels like there not this extra power. Maybe im just used to it??

[itbmils]

Well - I have a VERY different experience

The trip from 3.5K to 8K is over in a matter of seconds – pulls very hard all the way (I'm pully 300awkw – and it's all action from 3.5k rpm)

NO FLAT SPOT AT ALL

that could be a tuning issue tho

Edited January 19, 2006 by itbmils

[PhilGTR]

What mods have you got? apart from your PFC?

So you mean i just need to get my ECU remapped or get a PFC and get it tuned and it should be better? Do you know if restting the ECU will make any difference?

Edited January 19, 2006 by PhilGTR

[itbmils]

My mods include

full engine rebuild (forged and balanced)

R34N1s (I have the .48 A/R exhaust housing – which are the small N1s )

head was ported and polished

Tomei adj cam gears

Tomei fuel pump

3.5" exhaust with split (HKS style) dumps

Apexi PFC

Apexi EBC

std 440cc injectors

std AFMs

std FMIC

I get 297awkw @ 18psi

with bigger injectors, cams and RB25 AFMs – I expect to get to 350awkw easy (may need a new FMIC too)

I had R32 N1s with the Blitz Access ECU and was getting ~240awkw

I'm still not convinced that the tune will make that much difference .

Even before I had the PFC fitted (after fitting the N1s) it was still not what I would call laggy

[Bass Junky]

There's something wrong with your car if you are waiting until 7k to spool with R34 N1 turbos.

I think your stock computer is have a fit and you should really fit a Power FC. You certainly wont regret it.

[PSI_GTSII]

I run GT2560Rs which in essence are similar to your N1's

Mine are also Noticeable laggier than the standard units, when really they should'nt be.

I also have retained the standard ECU for now, and like me this is what will be holding you back

Because your new Turbos will be flowing so much more air it goes beyond the Factory ECUs mapping capability, hence when you come onto boost 5000rpm for me, your AFRs take a big dive and prevent noticeable gains in HP being made

Mine is making 315rwHP on 14psi (No Boost control fitted but restrictor removed)

*Quick look at my Dyno sheet shows its making 315 from 5000rpm to 8000rpm revlimit, before 5000rpm AFRs are fine, as soon as it starts making Power (5000rpm) AFRs take big dive*

By simply fitting a PFC and keeping boost the same this should jump 40rwHP and improve driveablity by sorting out the AFRs.

It will be my next Mod.

You can acheive similar result from Remap of standard ECU, but if you make any more changes down the track a whole remap is required again which can get expensive.

Go the PFC

Edited January 19, 2006 by PSI_GTSII

[druzilla32]

get a pfc, it will help you find out if there is something else wrong with the car... which it sounds like there is

[PhilGTR]

get a pfc, it will help you find out if there is something else wrong with the car... which it sounds like there is

<{POST_SNAPBACK}>

Thanks guys. its just that the turbos have set me back a bit of monies for now but i guess i will have to live with it for now until i can get a PFC.

[R31Nismoid]

I run GT2560Rs which in essence are similar to your N1's

Mine are also Noticeable laggier than the standard units, when really they should'nt be.

2560/N1's... and 2530's etc should take a big longer to build boost.

They are a bigger turbo <_<

Is they were GT-SS then they should very close to stock

[PhilGTR]

Well it seems this extra lag im getting turns out to be some sort of hose leak i think. As i'm not getting full boost at all. On the standard boost gauage im getting only a bit above 0. My bov stopped blowing off again and engine started to cut out this morning on idle. Well its back at the mechanics again to see what it the problem.

Does this sound like a leak to u guys?

[Bass Junky]

Blow off valve stuck open?

[PhilGTR]

When I first got the car back on tuesday the bov wont blow off but they tightened some hoses and it was ok again. But this morning after i drove it to the workshop there seems to be some steam coming out where the turbos are, i dunno whats going on. not much power and it i can hear a bit of an air leak somewhere when im driving and its coming from the left side of the engine.