Should I Crank Some Boost In This Baby :)?

[bax_nz]

hey dudes

i have a r32 gtst with the following installed

2 door coupe

rb20det (standard)

gtr fuel pump

4 inch mandral bent exhast

pod filter

600x300x76 intercooler + piping

mines computer (im told by previous buyer not 100%)

the car is currently running 12psi (0.8 bar) without a boost tap (i think its the mines ecu)

car ran a 15.00 with the above mods less the intercooler

now im told i should get a boost tap and regulator and wind the boost up to 16 - 17 psi then i should notice some more power?

would this be the next mod for more power or not? (looking at spending under $200 - $300 on next mod)

my car http://i31.photobucket.com/albums/c356/bax_nz/r32.jpg hehe

Edited March 6, 2007 by bax_nz

[ademgim]

hey dudes

i have a r32 gtst with the following installed

2 door coupe

rb20det (standard)

gtr fuel pump

4 inch mandral bent exhast

pod filter

600x300x76 intercooler + piping

mines computer (im told by previous buyer not 100%)

the car is currently running 12psi (0.8 bar) without a boost tap (i think its the mines ecu)

car ran a 15.00 with the above mods less the intercooler

now im told i should get a boost tap and regulator and wind the boost up to 16 - 17 psi then i should notice some more power?

would this be the next mod for more power or not? (looking at spending under $200 - $300 on next mod)

if you boost to 16 or 17 say bye bye to turbo

ps. could be the 4 inch exhaust that has up'd the boost

[Blitz]

hey dudes

i have a r32 gtst with the following installed

2 door coupe

rb20det (standard)

gtr fuel pump

4 inch mandral bent exhast

pod filter

600x300x76 intercooler + piping

mines computer (im told by previous buyer not 100%)

the car is currently running 12psi (0.8 bar) without a boost tap (i think its the mines ecu)

car ran a 15.00 with the above mods less the intercooler

now im told i should get a boost tap and regulator and wind the boost up to 16 - 17 psi then i should notice some more power?

would this be the next mod for more power or not? (looking at spending under $200 - $300 on next mod)

my car http://i31.photobucket.com/albums/c356/bax_nz/r32.jpg hehe

Say goodbye to your turbo

[RANDY]

You could probably switch to a series2 R33 turbo or an R34 item and run 20psi or so. Smaller motor is easier for a turbo to make more boost without killing itself.

Might cost you a fraction more than $300, maybe $450 for a good used R33 S2 turbo.

The R33 item would probably only have to spin up the same rpm on your motor to make 20psi, as it pushes 12psi on a '33?

On a related topic... What is the stock boost on an RB20? I thought it was close to 12psi anyway? Definitely more than the 33's stock 7psi, i'd imagine.

[WazR32GTSt]

stock boost on a stock r32 is 9psi

based on my experiences, the stock turbo won't make any more power after about 12psi. and after you approach 15 or 16psi, you are really starting to ask more of the turbo than its got in it

with the stock turbo i'd try it at 14psi but don't hope for too much improvement over what you have now

the rb25 turbo is only a mild upgrade, and may take 14psi with a decent increase in power but again it won't make more than 14psi without hitting a wall there too.

the boost is relative to the capacity of the engine. a 2.5L engine making 12psi is much more air being compressed than a 2L engine making 12psi. that's why a rb25 generally won't handle as much boost before it will blwo a turbo because airflow at 12psi on an rb25 is proportional to airflow at around 14psi on an rb20

anyway this is based on my understanding and my experiences.

cheers,

Warren

[Cubes]

stock boost on a stock r32 is 9psi

based on my experiences, the stock turbo won't make any more power after about 12psi. and after you approach 15 or 16psi, you are really starting to ask more of the turbo than its got in it

with the stock turbo i'd try it at 14psi but don't hope for too much improvement over what you have now

I found the same. Mine before exhaust etc was 8.9psi.

Fitted the exhaust and it went up to... 10.9psi.

Going from 12.5psi to 15psi mine picked up 12rwkw. So 1.25psi for every 6rkw. Which isn't too good.

BUT what it did do was increase the mid range noticably.

Mine didn't have issues running that boost for close to 100,000km's (in total according to the odo ~178,000kms).

[Guilt-Toy]

hahahahaaa cubes.. i love it!!!

Gold.. just gold.

I found the same. Mine before exhaust etc was 8.9psi.

Fitted the exhaust and it went up to... 10.9psi.

Going from 12.5psi to 15psi mine picked up 12rwkw. So 1.25psi for every 6rkw. Which isn't too good.

BUT what it did do was increase the mid range noticably.

Mine didn't have issues running that boost for close to 100,000km's (in total according to the odo ~178,000kms).

[MANWHORE]

crank it baby.

[Blitz]

You could probably switch to a series2 R33 turbo or an R34 item and run 20psi or so. Smaller motor is easier for a turbo to make more boost without killing itself.

Might cost you a fraction more than $300, maybe $450 for a good used R33 S2 turbo.

The R33 item would probably only have to spin up the same rpm on your motor to make 20psi, as it pushes 12psi on a '33?

On a related topic... What is the stock boost on an RB20? I thought it was close to 12psi anyway? Definitely more than the 33's stock 7psi, i'd imagine.

You have got to be kidding Randy.

Suggesting that someone run 20PSI through a stock R33 or R34 turbo? - Yeah good luck with that!

[GTAAAH]

second that, they won't hack more than 14psi on the majority of applications, unless your lucky.. Stock boost was 10psi on mine and is 10psi in a few manuals so i dont know whats happening there either

[Rolls]

Answers: its running 12psi because of the massive exhaust. Anymore and it will cook the air making bugger all more power and probably go pop.

For a cheap fix get a 25det turbo and run 12psi with that and get your ECU tuned to suit. Should see ~180rwkw

If you want something decent get a hks 2530 and injectors+tune to suit. Should see 200-220rwkw. Anything bigger and it will be a lag monster.

[Gazee]

You have got to be kidding Randy.

Suggesting that someone run 20PSI through a stock R33 or R34 turbo? - Yeah good luck with that!

LOL mine blew at 12psi let alone f**king 20psi... vvvvmmmm tututuBANG!

[Cubes]

It was covered quite some time ago why ceramic turbo's let go.

1. Just bad luck.

2. Excessive EGT due to poor tuning/detonation/lean

[bubba]

Man that RANDY guy is smoking some good crack. Disregard everything he said.

But yes, get an RB25 turbo. Will take a bit longer to spool up but they flow more for a given pressure (ie. 12psi on an rb20 turbo and 12psi on an rb25 turbo, the 25 turbo will be flowing more air).

Also get a good ebc.. I put one in on the weekend and while still running stock boost (~10psi) until I can get a tune, I have it set to keep the wastegate shut until 9psi, spools much faster and feels a bit quicker

[WazR32GTSt]

Also get a good ebc.. I put one in on the weekend and while still running stock boost (~10psi) until I can get a tune, I have it set to keep the wastegate shut until 9psi, spools much faster and feels a bit quicker

my turbotech boost controller comes on very early, has never spiked, and holds boost flat on the dyno every time

i personally can't see the advantage of an EBC at 4-5 times the price

[Rolls]

I had a turbocrap one on my previous car (rb20det) on the lowest setting it would spike to 15psi and then drop to 10. Hopeless piece of shit. Some bleeder seem to work better then others but I still don't really trust them.

[T04GTR]

change the turbo and go nuts