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Should I Crank Some Boost In This Baby :)?

bax_nz

By bax_nz,
in Engines & Forced Induction

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bax_nz Explorer

bax_nz

Posted
Posted (edited)

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 :happy:

Edited by bax_nz
ademgim Enthusiast

ademgim

Posted
Posted
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 :happy:

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

Blitz Grand Master

Blitz

Posted
Posted
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 :happy:

Say goodbye to your turbo

RANDY Veteran

RANDY

Posted
Posted

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 Grand Master

WazR32GTSt

Posted
Posted

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 Grand Master

Cubes

Posted
Posted
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 Grand Master

Guilt-Toy

Posted
Posted

hahahahaaa cubes.. i love it!!!

av-382.jpg

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).

Blitz Grand Master

Blitz

Posted
Posted
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!

Rolls Grand Master

Rolls

Posted
Posted

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.

bubba Grand Master

bubba

Posted
Posted

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 Grand Master

WazR32GTSt

Posted
Posted
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 Grand Master

Rolls

Posted
Posted

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.

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