How to get the most tourqe?

Discuss the RB20, RB25 and RB26 series engines.
S13Sil-line
Posts: 526
Joined: Thu Jul 31, 2003 10:02 am
Car: Full throttle-*** out sideways

Post

I understand tipically you have to increase the hp numbers to get more tourqe. I'm not a huge top speed guy or drag guy. I love to drift and I want to get the most tourqe out of my RB as I can with a small budget.


nab911
Posts: 2438
Joined: Thu Jul 03, 2003 9:33 am
Car: 93 Nissan 240SX SE

Post

Well torque is based on stroke. But on a budget the stroker kit is out. Just build it as you would any other motor. Stay with a small turbo for fast spool, get a good sized exhaust because the turbo has plenty of backpressure for it. Get lightweight flywheel and underdrive pully's to lower rotating mass.

User avatar
PROJECTRB240SX
Posts: 3673
Joined: Fri Jun 13, 2003 5:33 pm
Car: 1972 DATSUN 240Z W/ SR20DET

Post

HP IS DEPENDANT ON TORQUE AND REVS NOT THE OTHER WAY AROUND.

TO BUILD TORQUE YOU INCREASE STROKE, RAISE COMPRESSION, INCREASE BOOST, LENGTHEN INTAKE RUNNERS, CHANGE CAM SPECS, ETC.

A PAYCHECK TO PAYCHECK BUDGET IS PROBABLY TO DIFFICULT TO ACHIEVE THESE THINGS.

User avatar
xjon
Posts: 524
Joined: Thu Sep 05, 2002 4:29 pm
Car: 99XJ, 93 240coupe

Post

Try smaller wheels and tires. You'll kill top speed though.

leroy0053
Posts: 43
Joined: Sun Nov 02, 2003 3:02 pm
Car: guitars and cars
Contact:

Post

alright man here goes. i drift. i have a rb20det. my mods or rb25 turbine. the 25 turbine spools at 2000rpm and full boost by 3000. since the rb20 doesnt flow as much air as the 25 i boost 1.1. which brings me to the retuned ecu i have. not needed. u say u are on a budget. i have a screamer pipe, a.k.a. wastegator, a.k.a. anti-turbulence pipe. when the actuator on the turbine opens up at full boost that exhuast gets vented into the atmoshpere. that helps tubrine spool up alot faster. 3"downpipe and exhuast all the way back. and of course a boost controller. but then again drifting is also the way your suspension settings are. email me at [email protected]

http://www.midnightillusion.comhttp://w ... senyou.com

S13Sil-line
Posts: 526
Joined: Thu Jul 31, 2003 10:02 am
Car: Full throttle-*** out sideways

Post

Well, with what size turbo and size exaust would be best for getting good tourqe??

User avatar
krayton
Posts: 1090
Joined: Tue Jun 24, 2003 11:10 am

Post

im running a rb25 with a rb20 turbo at 7psi. no problems drifting.

only thing i cant do are huge D1 style drifts, which if i even had the power i doubt i could do.

but i personally think youd be fine stock.

leroy0053
Posts: 43
Joined: Sun Nov 02, 2003 3:02 pm
Car: guitars and cars
Contact:

Post

lots of people think u need big turbines to drift. look at the ae86's they have no power, u overcome power by using speed and technique.

http://www.midnightillusion.comhttp://w ... senyou.com

User avatar
93RPS13
Posts: 1238
Joined: Wed Jan 01, 2003 5:19 pm
Car: Cars, Girls, Cars, Food

Post

how much torque does a ae86 have anyways? thanks

nab911
Posts: 2438
Joined: Thu Jul 03, 2003 9:33 am
Car: 93 Nissan 240SX SE

Post

leroy0053 wrote: i have a screamer pipe, a.k.a. wastegator, a.k.a. anti-turbulence pipe. when the actuator on the turbine opens up at full boost that exhuast gets vented into the atmoshpere. that helps tubrine spool up alot faster.


Lol whoa.. so right as it hits full boost you spool up faster? The screamer pipe just helps power after full boost, doesnt help spoolability at all. To spool faster you need a good boost controller, large exhaust, a well designed manifold, good cooling capabilities (big one).

User avatar
Wulfgang
Posts: 908
Joined: Tue Oct 28, 2003 5:41 pm

Post

How did cooling capabilities make it into a post about spooling faster???

nab911
Posts: 2438
Joined: Thu Jul 03, 2003 9:33 am
Car: 93 Nissan 240SX SE

Post

Well buddy up there said something about his screamer pipe increasing spoolability and i listing what are ways to help spoolability.

User avatar
Wulfgang
Posts: 908
Joined: Tue Oct 28, 2003 5:41 pm

Post

Ok.... so how does cooling help spool?

nab911
Posts: 2438
Joined: Thu Jul 03, 2003 9:33 am
Car: 93 Nissan 240SX SE

Post

If you have a turbo the is very well cooled and blows cool air and a motor that is properly cooled it will spool faster, and increase power gains.

User avatar
rbsileighty
Posts: 1694
Joined: Sun Feb 09, 2003 8:10 am
Car: 92 S13 Hatch w/ RB20 & 05 Audi S4 Avant 6MT

Post

I've read that the split front pipes help increase tq... but I have no experience with them.



A stock free flowing exhaust/intake with a good IC would really help quick spool. As long as you are pushing low boost levels you should look into a water to air IC so your IC piping is minimized.

leroy0053
Posts: 43
Joined: Sun Nov 02, 2003 3:02 pm
Car: guitars and cars
Contact:

Post

nab911. sorry man guess i worded it wrong,my bad. what i am tryin to say is that with the screamer pipe i hit full boost a lot faster. lots of my friends have them and a lot dont. we are about the same caliber drivers when it comes to zeroyon( drag racing) i have raced my friends at different boost levels. i would pull slightly ahead in 2nd gear but mainly 3rd and 4th u really start cookin.

leroy0053
Posts: 43
Joined: Sun Nov 02, 2003 3:02 pm
Car: guitars and cars
Contact:

Post

how long have u had an rb nab. how many rb setups have u run through. i had a rb25, and building a 2.4 now. i find it funny how people have an rb20 in their car and read all day online and think they know their ****. lots of good people on this forum, but some people are a little ****y. do u push your car what exactly do u do with your car. so tell me this nab if the turbine being cooled has a lot to do with "spoolability"then why are aftermarket turbine manufacturers making turbines without water line ports. maybe u can read that somewhere and get back with me.

http://www.midnightillusion.com

leroy0053
Posts: 43
Joined: Sun Nov 02, 2003 3:02 pm
Car: guitars and cars
Contact:

Post

i figure i come to the forums, u know try to clear up peoples questions, see what setups people are running. see whats goin on with the rb's and ca's in the states. i aint here to make enemies.

http://www.midnightillusion.comhttp://w ... senyou.com

w1ngzer0
Posts: 7535
Joined: Sun May 04, 2003 7:49 pm
Car: Pfft. i don't own a box
Contact:

Post

where is a good trusted shop in japan i can order a RB26 clip from?

nab911
Posts: 2438
Joined: Thu Jul 03, 2003 9:33 am
Car: 93 Nissan 240SX SE

Post

Whoa man... im not trying to argue or start anything. A lot of turbos arnt water cooler because your engine heats up your water system and hot water flowing your turbo isnt going to cool it down much. I dont own an rb, im running a ca18det with a OIL COOLED ONLY t3/t04e with a custom made top mount mani, externaly gate 38mm tial and im getting 3" exhaust done this weekend with a "screamer" pipe for the wastegate but im starting to think that word is used to much. What is a screamer pipe exactly? I thought it was just a totaly seperate pipe that dumped the wastegate gases to the atmosphere some where really early instead of flowing it to the exhaust. I dont see why have a screamer pipe would help spooling because your wastegate is shut until it hits full boost anyways.Also i dont see why everyone gets all defensive when someone disagrees with them. Debate about what you know/think and come to a conclusion, dont start getting rude and offensive.

User avatar
Wulfgang
Posts: 908
Joined: Tue Oct 28, 2003 5:41 pm

Post

Um... I *could* be wrong... but I am pretty sure the primary reasons many turbo setups are not water cooled are much more simple than what you said:

1. Water cooled turbos cost more.2. Running water lines is difficult.3. Water cooled turbos cost more.

Most, if not all, OEM setups use water-cooled turbos because they are more durable and far, far less susceptible to coking. And although it is true that your coolant is "hot", circulating at right about 190ºF after going through the engine, it is still many hundreds of degrees cooler than your turbine housing after a hard run.


Return to “RB20DET / RB25DET / RB26DETT Forum”