R33 Rb30 Conversion

[Cubes]

The VL SOHC boys don't have any issues running the GT35R with a 1.06 exh. a/r.

They claim the .82 comes on too hard and creates too many traction issues.

[masTers]

How soon would the 35/40 be on boost?

[Skyrine-Dave]

How soon would the 35/40 be on boost?

I'll let you know in a few days time

Tho i will be on run in tune and low boost

[TTT]

slightly off topic but I have a few more questions.

and these are all to have the RB30det in an R32 GTST

1.)What ECU. I know obvious choice is PFC.., what are they worth? what are other options?

I ask this because if you factor in a PFC and hand controller, Z32 or Q45 AFM, the price is pretty high and you don't even have it on there yet.

What ECU's are available that don't need AFM but still work well with cold start, fuel consumption and so forth.

2.) 500HP TURBO. internally gated? will this control boost reliably? which one will bolt to the stock RB20/25 exhaust manifoild?

3.) for this turbo and looking at somewhere around 300rwkw.... what dump pipe?

will those dump and front in one jobs from BATMBL on these forums do the trick?

will it be too restrictive and cause over boost problems?

4.) and this has been looked in to kind of. but... for a street only car (with possible trips to track and strip to see how it all goes onec or twice) but mainly a street car.. what size exhaust housing is best?

since I don't plan to rev past 6000rpm nor run more than 1 bar boost.... the 0.82 rear has been given a "light switch" title by some. is it going to be uncontrolable?

will the 1.02 or what ever the bigger one is be too laggy on the street..

example, cruising in 4th at 65km/h (standard R32 gearbox and diff) and you plant your foot..

will the 0.82 end up in a smoke show?

will the 1.02 end up with you at 70km/h after 5 seconds?

take in to consideration the 8.2 or 8.3 compression I will have using stock Rb30 bottom and stock Rb25de head.

[Sydneykid]

slightly off topic but I have a few more questions.

and these are all to have the RB30det in an R32 GTST

1.)What ECU. I know obvious choice is PFC.., what are they worth? what are other options?

I ask this because if you factor in a PFC and hand controller, Z32 or Q45 AFM, the price is pretty high and you don't even have it on there yet.

What ECU's are available that don't need AFM but still work well with cold start, fuel consumption and so forth.

2.) 500HP TURBO. internally gated? will this control boost reliably? which one will bolt to the stock RB20/25 exhaust manifoild?

3.) for this turbo and looking at somewhere around 300rwkw.... what dump pipe?

will those dump and front in one jobs from BATMBL on these forums do the trick?

will it be too restrictive and cause over boost problems?

4.) and this has been looked in to kind of. but... for a street only car (with possible trips to track and strip to see how it all goes onec or twice) but mainly a street car.. what size exhaust housing is best?

since I don't plan to rev past 6000rpm nor run more than 1 bar boost.... the 0.82 rear has been given a "light switch" title by some. is it going to be uncontrolable?

will the 1.02 or what ever the bigger one is be too laggy on the street..

example, cruising in 4th at 65km/h (standard R32 gearbox and diff) and you plant your foot..

will the 0.82 end up in a smoke show?

will the 1.02 end up with you at 70km/h after 5 seconds?

take in to consideration the 8.2 or 8.3 compression I will have using stock Rb30 bottom and stock Rb25de head.

Suggestions follow;

1. PFC is the go, it is cheaper all up, the install is a simple plug in, car will run on the base maps, drive it to the dyno, $300 job finished.

2. GT30 (do a search plenty of guys have used GT30's on RB25's)

3. BATMBL split dumps will work fine, don't understand the boosting question.

4. The 0.82 would be my choice as I prefer response, I can use the boost controller to soften the boost hit if I want.

[88silhouette]

GT35/40's what .AR's does everyone recomend? .82 or 1.02?

Clearly due to a limited rev limit, youd want something on early? I'm chasing 300 rwkw at low rpm with minimal boost. Leaning towards the .82 with a 35mm wastegate.

i have a td0620g. r33 rb25head. stock rb30 bottom end. 8 psi. 230rwkw. hits boost very low in the rev range. full on by 2200

[fatz]

anyonw had experience with stock gtr head at twins on the 3 litre

ill be keeping the twins till the lotto win?

[TTT]

the overboosting I was refering to...

Some cars I've seen (mitsubishi's), when the dump pipe or wastegate itself are too restrictive, they tend to over boost or spike up to above what you set it.

don't know wether to call it boost spike or creep or over boost.

and with a largish turbo, and a dump pipe where the wastegate and turbine gases aren't seperated, I thought it might be an issue... but if you disagree, that's a good enough for me.

[Sydneykid]

and with a largish turbo, and a dump pipe where the wastegate and turbine gases aren't seperated, I thought it might be an issue

I thought I covered that with this;

3. BATMBL split dumps will work fine

A split dump separates the wastegate and turbine gases. Or have I missed something :confused:

[Looney_Head]

sorry if this has been covered but what rev can you take a rb30det to with standard rod.

thanks

[masTers]

Ive been told about 300rwkw with shot-peened stock rods.

[TTT]

looney head - it seems that 6000-6500rpm is a safe rev limit

Gary - sorry. when I was refering to BATMBL's dump pipes, I was refering to the original one piece ones which have a bellmouth type opening at the turbo.

which then shrinks down to a 3 inch pipe.

when I read your reply, I skimmed over it and didn't take in the "SPLIT" part.

do you know the other ones I am refering to?

this pic isn't one of his but the shape is kinda similar..

[Bl4cK32]

my front pipe had to have a small extender piece welded in. Due to the new height of the motor, the turbo sits higher also. Meaning that the dump/front you are looking at may require some cutting/welding to make it reach your turbo.

Depends how flexible your exhaust is atm. I had mine chopped, as well as had some supports welded to the pipe so i could connect it to the gearbox for added support for the turbo etc...

[dnb]

progress pic

[TTT]

that is a bigarse heat shield.

[Sydneykid]

the overboosting I was refering to...

Some cars I've seen (mitsubishi's), when the dump pipe or wastegate itself are too restrictive, they tend to over boost or spike up to above what you set it.

don't know wether to call it boost spike or creep or over boost.

and with a largish turbo, and a dump pipe where the wastegate and turbine gases aren't seperated, I thought it might be an issue... but if you disagree, that's a good enough for me.

I haven't ever seen that problem on RB's, even with standard dumps and engine pipes. I wouldn't worry about it until you actually experience it on your car.

[Cubes]

If anything RB's tend to have boost tailing off at higher rpm's.

[StockyMcStock]

...... cause it's hard to afford a turbo large enough to supply the engine with the air it needs.

[Cubes]

The RB's definitely do like to swallow air.

[Bl4cK32]

Had my rb30det tuned yesterday.

Previously had what was thought as timing issues. Turned out it was a faulty cas. All sorted....turbo is a rb20 highflow that was on before motor was built.

Results are below. Had issues with the q45 afm...apparently (cubes feel free to go into more detail ) 1 bar is at the end of the map range.

Shaun, the tuner, said it runs the best when set up with the q45 running as the rb20 afm under the settings. Changing it to the vh45 afm just makes the car run very rich, and he said something like he cant pull any more fuel out?

Cubes....ring shaun for me and get the lowdown on this Me no technical

Could have run more boost, but like i said need to sort it running rich under boost....

Need subframe bushes now, as the 2 way makes the rear squirm....and breaks traction in 2nd on boost