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Stock boost on 34 gtt

Motorman

By Motorman,
in Engines & Forced Induction

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Motorman Collaborator

Motorman

Posted
Posted

Hey,

I have a 34 gtt with full 3" exhaust (turbo back) and a pod filter. I was going to leave the boost alone as I was told that 34's run 0.9 bar (about 13 psi) from the factory. I ignored the factory boost guage until I just realised it measures in kg/cm2 which is Bar and at full boost it only goes up to about 0.6 (about 8 psi). Can anyone verify the stock boost level on an r34? Also if the guage is definitely accurate and the stock boost level is around 8 psi I would probably use a bleed valve to increase it to 1 bar. Has anyone done this themsleves to a 34, if so is the increase in power worth it?

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choyda Veteran

choyda

Posted
Posted

Stock boost is supposed to be 6psi which is just a bit below the 3/4 mark. I have noticed mine going a little over in cold air areas (early mornings or around Mt Tambo)

Don't know about upping the boost. From what i've heard, u dont want to take the standard turbos above 10psi cos theyre quite fragile yet quick to spool to full boost.

Motorman Collaborator

Motorman

Posted
  • Author
Posted

Hmmmm, thanks for the replies.

I think i'll hook up a boost guage temporarily to get a definite reading. Does anyone know from first hand experience if 34 turbos can run 14 psi with the stock intercooler (relatively) safely. I'm pretty keen to increase it to 1 bar providing its not too harsh on the turbo (at the moment it just doesnt feel quick enough!) - Choyda, you say from what you've heard its not a good idea to go above 10 psi on 34's, im confused because i've heard all sorts about 32's an 33's (mostly 12 psi is ok for stock cooler) but nothing about 34's.....

Also i have a blitz Boost guage (one of those funky E.L ones that are way overpriced!) - does anyone know if it would fit in the factory guage pod, if so i reckon it would look nice n tidy :cheers: (it looks like it would fit, i just wanted to make sure as i'm sure someones already tried it and knows how much modding is required)

Abo Bob Grand Master

Abo Bob

Posted
Posted

Those three gaugues in the centre are one unit so you can't just pull one out and replace it with a different kind.

I believe about 12psi is safe to run but I can tell you from first hand experience that you shouldn't push it more than that. Mine spiked to 0.91 bar on sunday and that blew my turbo.

Motorman Collaborator

Motorman

Posted
  • Author
Posted

Abo Bob - thats not cool about your turbo, what mods do you have and how long have you been runnin that boost and with what controller??

Also is yours manual? I noticed your 1/4 mile time, i went to run at willowbank raceway lat night but it was rained off :cheers:

Did you increase the boost yourself? - if so what was the stock boost setting?

Anyone else - stock boost setting on r34's!!??

Thanks

Abo Bob Grand Master

Abo Bob

Posted
Posted

Motorman - I've been running 0.8 to 0.85 bar for about 8 or 10 months I think.

I have a full exhaust including split dump/front pipe combo which is HPC coated.

Nismo panel filter.

Chipped ECU

Auto/tiptronic

AVC-R

Blitz LM Intercooler

189rwkw last tested before cooler install.

I don't think that a very good 1/4 mile time. It was consistant though cos I did about 30 odd passes that day. 13.9 in 'D', 14 flat down to 13.8 changing gears with the buttons.

Stock boost is 7psi, just under 0.5 bar. That's a fact.

Nah Elushun - High flow going in now.

I think 12 psi is safe for an r34. Mine spiked on the track. 190km/h near redline and pfft.

12 psi is definitely safe on the street. If I think about it; as I came out of the last turn onto the straight in second gear I floored it, so from there to the end of the straight (90km/h up to 190km/h) I was on boost permanently. So an already hot turbo from the track work I was doing, coupled with a sustained period of high boost and add those to the fact that it spiked to 0.91 bar and it's no wonder it blew.

Anyway, steel wheel going in now.

infected flow Rising Star

infected flow

Posted
Posted

im not going to argue do a search and do the research!

and if u think 12psi is safe your sadly mistaken!

Motorman - I've been running 0.8 to 0.85 bar for about 8 or 10 months I think.

I have a full exhaust including split dump/front pipe combo which is HPC coated.  

Nismo panel filter.

Chipped ECU

Auto/tiptronic

AVC-R

Blitz LM Intercooler

189rwkw last tested before cooler install.

 

I don't think that a very good 1/4 mile time.  It was consistant though cos I did about 30 odd passes that day. 13.9 in 'D', 14 flat down to 13.8 changing gears with the buttons.

 

Stock boost is 7psi, just under 0.5 bar. That's a fact.

 

Nah Elushun - High flow going in now.

 

I think 12 psi is safe for an r34.  Mine spiked on the track.  190km/h near redline and pfft.

 

12 psi is definitely safe on the street.  If I think about it; as I came out of the last turn onto the straight in second gear I floored it, so from there to the end of the straight (90km/h up to 190km/h) I was on boost permanently.  So an already hot turbo from the track work I was doing, coupled with a sustained period of high boost and add those to the fact that it spiked to 0.91 bar and it's no wonder it blew.

 

Anyway, steel wheel going in now.

choyda Veteran

choyda

Posted
Posted

Well from what I was told at the last meet, the turbos are ceramic bearing with a nylon based compressor wheel that doesnt take high boost well (the wheel breaks) but again, spools up quite quickly. There are alse series 2 R34's around that had steel wheel turbos from the factory apparently. Ask AFRO if u can track him down... something to do with if the turbo has NISSAN or Garrett on it.

Motorman Collaborator

Motorman

Posted
  • Author
Posted

Ok, the stock 0.5 bar would make sense as with a full exhaust mine is runnin just over the halfway mark on the factory guage which i am assuming is quite accurate. I will hook up a decent guage just to make sure of current boost. Lets say i am running 0.6 bar (8-9 psi) do you think it is worth increasing to 12 psi - i am guessing there will a very small gain and i will increase spiking and it will be to some degree harsh on the turbo.. i find it strange that an R33 25t turbo can run 12 psi or up to 14 with a larger cooler safely but a 34 turbo is weaker??

Abo bob - i'm interested in the mods on your car, i know that bigger turbo, front mount, power fc would be the next step for decent power but realistically that would be $6-7k (plus other bits like clutch n fuel to cope with the extra 100kw or so) but to be honest i don't wanna spend that kind of money. Did you notice respectable gains from ur tuned ecu, i have a pod which feels better than the factory filter (but not by much) is the panel better because theres not much air gettin to the pod as the factory air dam is now gone..? Lastly with the front mount is there much gain at the boost ur runnin? I reckon you'd be increasing lag but not getting much of a gain considering the relatively small amount of air that the stock turbo produces??

Abo Bob Grand Master

Abo Bob

Posted
Posted

I got 27 rwkw from the ECU. I noticed an immediate gain from the panel filter but I've never had a pod so can't really comment. I know that they flow better than stock filter but if it is not enclosed in a box then you are sucking hot engine bay air into it which will decrease performance.

I don't think I gained much if any power from the FMIC. And yes I did get a decrease in response (different from lag) from it. It went fine with the stock cooler but I got it to keep it safer with cooler air. Obviously it didn't really help because I've blown my turbo anyway. Maybe it would have happened sooner.

I am putting a high flow turbo on there now. I wanted a GTRS but have decided to save my money for now. I'll see what I can get out of this.

Clinton Explorer

Clinton

Posted
Posted
Hey,

  I have a 34 gtt with full 3" exhaust (turbo back) and a pod filter. I was going to leave the boost alone as I was told that 34's run 0.9 bar (about 13 psi) from the factory. I ignored the factory boost guage until I just realised it measures in kg/cm2 which is Bar and at full boost it only goes up to about 0.6 (about 8 psi). Can anyone verify the stock boost level on an r34? Also if the guage is definitely accurate and the stock boost level is around 8 psi I would probably use a bleed valve to increase it to 1 bar. Has anyone done this themsleves to a 34, if so is the increase in power worth it?

Had my R34 GTT on dyno when it was stock to get an accurate KW & boost reading ( the boost gauge isn't always that accurate).

I can verify my stock 34GTT ran apx 8 psi on boost most of the way, a little over at its peak.

Motorman: You also seem to be in the same dilema as I am. I currently have pretty much the same mods as you. When I consulted my local workshop intrested in upping my boost I got the same response as those who have posted here. The general consensus was not to overstep the 10 psi mark to be safe. As far a bleed valves go (no matter how good) there is the possibility to spike at least 1 or 2 psi on boost. I know some bleed valves these days are a lot better and more consistent, but I'll wait till down the track to start telling my boost what to do.

I'll have to get my boost checked since adding mods. But I think (for mine) at the moment running somewhere betwen 8 & 9 psi is enough for now. At least not worth winding up yet.

As an example: HPI's project R34 GTT didn't take that long to blow a turbo on the track at 1 bar. I'll have to watch the HPI video again to be sure (can't remember what No.).

As a side note: I'll be posting the results of adding Splitfire DI coilpacks to the mix of mods on Monday.

Good thread, cheers.

ed Grand Master

ed

Posted
Posted
how would a T3/T04 garret turbo rated at 450hp (with a 300x600x75 RHK FMIC) perform on the stock RB35DET motor? Whats the stock r34 turbo flange? at what point do you upgrade the internals?

You will max out your fueling before you hit the potential of the turbo.

ECU will limit you serverly.

T3 flange.

I would keep power to 250rwkw on stock internals but others have pushed beyond this with no problems.

R31Nismoid Grand Master

R31Nismoid

Posted
Posted
12 psi is definitely safe on the street.  If I think about it; as I came out of the last turn onto the straight in second gear I floored it, so from there to the end of the straight (90km/h up to 190km/h) I was on boost permanently.  So an already hot turbo from the track work I was doing, coupled with a sustained period of high boost and add those to the fact that it spiked to 0.91 bar and it's no wonder it blew.

 

Anyway, steel wheel going in now.

do the same thing for approx 4-5 laps and then come back and say its working the same :rofl:

And abo bob, isnt your turbo blown at the moment?

R31Nismoid Grand Master

R31Nismoid

Posted
Posted
what kind of boost can the stock ECU/injectors/fuel pump go up to?

stock ECU you'd be lucky to get 200rwkrw, you might be able too squeeze 220rwkw with a bigger turbo but then the injectors would be on the edge IMO

but hard too use a rwkw figure as every dyno is different :rofl:

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