RB FAQ

[smellslikerubber]

also looking on other opions on where to go with the car from here? as far as motor work. what are good upgrades to start with? i want to get a good strong running motor before i go and try to drift the car. if that is what i decided to do with it

[redline racer510]

Originally Posted by smellslikerubber

s13
RB20

i have a mostly stock rb20. i just got it running strong but i still feel like it has a fuel issue. it has a walboro fuel pump and stock injectors. im looking to upgrade the fuel sytem and i want it to be top notch to where i only need to do it once. so im wondering what would be the best installs. 440cc injectors? or would something bigger be better. what would i need as far as fuel rail and lines? i also know i will need a FPR. im also started to look into the Greddy Emanage, would that be a good option as well? just looking for a good set up. i wanna make somewhere around 400hp when im done with the car. so suggetions and set up ideas are welcome

First off there are many things to consider when installing a proper fuel system. What is your HP goal and what are you going to be doing to the car. For most people with bolt-ons and moderate setups a walbro 255 will be enough to safely get you to around 450whp now if this car is going to see very high horsepower and or heavy track use you may want to look at a dual fuel pump setup and even a surge tank with dedicated power circuits,larger lines etc.You need to do more reading as this is a very simple breakdown of things and mistakes in this area can be expensive(damage engine).

[smellslikerubber]

i have a walboro 255 now. everything else in the fuel sytem is stock. oem injectors. i wanna make somewhere around 400hp when the car is done

[redline racer510]

Originally Posted by smellslikerubber

i have a walboro 255 now. everything else in the fuel sytem is stock. oem injectors. i wanna make somewhere around 400hp when the car is done

550cc injectors a fpr and z32 fuel filter and dont forget to have your car to have your car professionally tuned and you will be ok.

[lamgee]

rb20det stock
I want to replace the top intake manifold with side intake manifold and to put fmic with short piping runs just like rb26 setup. Can you guys tell me who makes quality intake and fmic?

[240Z28]

I have an rb25det ecu. Would that run my rb20det?

[fearlessKouki]

No sell it and get a rb25 ecu!

[240Z28]

So rb25 = good and rb25det = no good?

[fearlessKouki]

I meant get the rb20 ecu.

[terrance john]

can someone take a picture of a rb20 tranny and show me where the speed sensor is -.- im such a noob when it comes to this.

[JTunedMotorsports]

Originally Posted by terrance john

can someone take a picture of a rb20 tranny and show me where the speed sensor is -.- im such a noob when it comes to this.

pm me your # i will text u

[terrance john]

Originally Posted by JTunedMotorsports

pm me your # i will text u

pmed my man

[terrance john]

alright guys im going for 400hp ( yes ive read up) i just bought a holset hx35w turbo, question is does it bolt up to the stock manifold? also what type of 750 cc injectors should i run? and i am getting a z32 maf and a safc tuning setup. anything else i would need?

[JTunedMotorsports]

Originally Posted by terrance john

alright guys im going for 400hp ( yes ive read up) i just bought a holset hx35w turbo, question is does it bolt up to the stock manifold? also what type of 750 cc injectors should i run? and i am getting a z32 maf and a safc tuning setup. anything else i would need?

What motor? Food for thought Im doing borg Warner EFR 7064 IWG, stock mani, 555cc RC, FPR, modded jun syle mani, aeromotive pump 340. z32 maf and rare PFC for the rb20. NEVER use a safc go PFC, rom tune or Haltech if you can get it to work for the rb20

[seagrasser]

HX35 will bolt up to stock exhaust manifold, but steering column and linkage get in the way (if LHD).

[terrance john]

Originally Posted by JTunedMotorsports

What motor? Food for thought Im doing borg Warner EFR 7064 IWG, stock mani, 555cc RC, FPR, modded jun syle mani, aeromotive pump 340. z32 maf and rare PFC for the rb20. NEVER use a safc go PFC, rom tune or Haltech if you can get it to work for the rb20

alright my man yes its a rb20 , this is what i bought today! hx35 ( rebuild for 300 bucks 0 miles) 850cc injectors, walbro 255. next things i need is a pfc, rom tune or haltech. any recommendations on any of these and which ones i should go with? ALSO i want to get some ls truck coils would they work with the stock ecu even though the dwell time is much higher than stock? buddy of mine wants to sell his set pre wired for 200.

[terrance john]

Originally Posted by seagrasser

HX35 will bolt up to stock exhaust manifold, but steering column and linkage get in the way (if LHD).

yeah its Lhd i have a modded down pipe for the steering colum and linkage + im getting a v band welded onto it.

[seagrasser]

OK, HX35 on a RB20 will spool fairly slow. What exhaust side is on it currently?

Check out here for another example.

http://zilvia.net/f/showthread.php?t=543836

Also, thought I said the turbo will bolt to the manifold (both T3) there is a clearance issue with the valve cover. A spacer and longer studs will give the needed .5 to 1 inch.

[terrance john]

Where can I get a t3 spacer from? And I might honestly upgrade to a rb25


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[terrance john]

Originally Posted by seagrasser

OK, HX35 on a RB20 will spool fairly slow. What exhaust side is on it currently?

Check out here for another example.

http://zilvia.net/f/showthread.php?t=543836

Also, thought I said the turbo will bolt to the manifold (both T3) there is a clearance issue with the valve cover. A spacer and longer studs will give the needed .5 to 1 inch.

Meant to quote you but it's stock exhaust


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[JTunedMotorsports]

Originally Posted by terrance john

Meant to quote you but it's stock exhaust


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Seems like you are having some issues, I could clear up most with what we have done in the past to RB cars, just pm me.

[seagrasser]

Originally Posted by terrance john

Meant to quote you but it's stock exhaust


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Sorry, I wasn't clear. What size is the exhaust housing side of the HX35? Is it divided or single inlet?

There are a lot of reasons to upgrade to the RB25:
They are newer
They provide more torque
You can make some serious power
RB25 transmissions are almost bomb proof.

But, having a holset HX35 should not be your primary reason.

Here is another good thread here on Holset use. Even shows an RB25, Holset HX35, and spacer, with stock exhaust manifold

http://zilvia.net/f/showthread.php?t=429571

[smoked240]

Alright I'm in need of a Rb guru. The machine shop I brought my Rb25 block to , punched out these plugs in the block to fully clean it. Now it's not any welsh plug, it's an iron plug either for oil or coolant. It goes straight through the block and there is 2 plugs, the front port is by the bottom large bolt on the water pump and between the oil pump, the back port is right above the rear main plate on the intake side.

If anyone knows where they can be sourced it would be very helpful!
My last option is to have a machine shop lathe me up two plugs but if they sell them it would make it easier. Thanks!

[seagrasser]

Found an old post that might help. Otherwise wait for those more experienced than me.

http://zilvia.net/f/showthread.php?t=259011

[redline racer510]

Anyone have any experience with hx35 and r.s. Enthalpy tune? I have his tune for my stock setup plus no maf and it runs good, but anyone with major upgrades and his rom tune?

[Beijing_Raccoon]

Hey guys I'm going with an RB20 swap soon, and I have a couple of questions.
Is there a difference between using an R32 crossmember vs aftermarket mounts like the mckinney mounts?
I've heard with the mckinney mounts I need to make room for the starter.
Secondly, with a wiring specialties harness I'll be using the RB20DET ECU or the Stock automatic ECU my s13 came with?

[fearlessKouki]

RB25DET
I have strange idle surge problem that comes and goes. I have noticed that it will start to surge when i turn on the wipers. It was worse before but after cleaning the Idle control valve it has gotten better. It is totally random, also in order to stop the surging i would have to rev the motor a little until it no longer surges. Really annoying. Any guesses?

[turbronegro]

How much are RB25's with a 5speed going for these days?

[seagrasser]

about $2k plus or minus

[smoked240]

I paid about $2500 with mount kit and 1-piece driveshaft from zero lift. That was about 6 years ago.