upgrading my rb20

[xdream]

ok so i have an rb20 installed... drives good. now its time to hook it up. its bone stock.

what should be the first mod for the engine? i dont want anything super expensive.

injectors and maf?

btw i have a racing radiator and fmic already

[xdream]

i am looking into rx7 injectors are they good and which series should i get them in?

also am looking at improving my ignition system... how can i do that for a good price? coils and ignition amplifier.....

[Joe]

injectors dont make horsepower. if you dont NEED the extra fuel you are only going to make it run worse.

what mods do you have?

downpipe, exhaust, boost controller?

[Carl H]

kamin: with 270cc injectors stock its easy to max them on a stock motor.

unless you are making over 300hp per liter no sense in upgrading the ignition...stock stuff is awesome.power wise what kind of money do you have to spend, almost any kind of turbo upgrade neccisitates larger injectors.

[xdream]

do you guys know of any reasonable priced turbo upgrades or is it better just having the stock one redone.

my power goals are 300hp

[Eikon]

to get to 300hp..

t3/t04e turbo, 440cc GTR injectors with drop in resistors, Z32 MAF, walbro fuel pump, fpr, proper FMIC, downpipe, exhaust, blowoff valve, and some sort of quality engine management (unless you really trust SAFC2), etc...

before getting 300hp in a 240sx... I'd be investing money in wheels, tires, brakes, suspension, etc... first.

good luck!

bye the way... if you want a good start... bolt on a RB25 turbo to go along with your FMIC, Exhaust, etc.. . that should get you close to 240hp and pretty much max out your injectors. After that you can start spending the real money for injectors, turbo, ems, etc...

[Shocker]

to get to 300hp..

t3/t04e turbo, 440cc GTR injectors with drop in resistors, Z32 MAF, walbro fuel pump, fpr, proper FMIC, downpipe, exhaust, blowoff valve, and some sort of quality engine management (unless you really trust SAFC2), etc...

before getting 300hp in a 240sx... I'd be investing money in wheels, tires, brakes, suspension, etc... first.

good luck!

bye the way... if you want a good start... bolt on a RB25 turbo to go along with your FMIC, Exhaust, etc.. . that should get you close to 240hp and pretty much max out your injectors. After that you can start spending the real money for injectors, turbo, ems, etc...

pshh im still rolling on Stang wheels.. you dont need wheels..but tires, brakes and suspension is a must tho! especially brakes so comming down from triple digit speeds is no sweat. Then go power, Eikon had a good suggestion there to for you.

[Eikon]

pshh im still rolling on Stang wheels.. you dont need wheels..but tires, brakes and suspension is a must tho! especially brakes so comming down from triple digit speeds is no sweat. Then go power, Eikon had a good suggestion there to for you.

My point was that if you are really going to put down 300whp... you should probably have something a little wider than the 6.5" or 7" stock wheels.. You're going to need a little more contact patch to get any traction.. either way... not a big deal.. the other stuff is more important by far...

One thing I forgot to mention that is very helpful is LSD!

[Carl H]

300hp is doable on the stock maf...

[jrb92se]

+1 for lsd also get a boost controller if you dont already have one and a good 3 inch exhaust

[xdream]

hey would i need a metal headgasket for 300hp? i put it all back together already but am wondering if i must get one? i really dont want to if its not needed, cause taking everything off and waiting for the parts is gonna delay me.

is it a must?

i have arp head studs and i got a new timing belt and water pump. i also have 300z brakes and springs and shocks.

[Yellow4g63]

reasonable priced

Those words don't go to well with RB swaps lol.

[themadscientist]

ok so i have an rb20 installed... drives good. now its time to hook it up. its bone stock.

what should be the first mod for the engine? i dont want anything super expensive.

injectors and maf?

btw i have a racing radiator and fmic already

Basic maintenance. Give it a tuneup and if the timing belt has more than 50000 kilometers on it change it. Go all over the motor looking for crunchy hoses and oil leaks, replace or repair offenders. Your stock turbo will get you 250hp safely. It can do a little more but lifespan drops drasticly and it is creating more heat than real power. You have to take care of the foundation that everything else will build upon first. The 260cc injectors are not going to cut it, I would recommend at least a set of RB26 squirters. You will have to wire in the dropping resistor though as they are a different impedance. You can source one domesticly from a VG30DETT. I don't know what fuel pump is in your car, if it is OE KA24 that won't feed enough fuel, while you are stealing the resistor from the Z snag the pump too. You already have the intercooler so we can scratch that off. Your OE RB20DET AFM is adequate but if you can get the Z one go for it, put a nice free-flowing air filter on it too. Full exhuast, tubular outlet, big downpipe and muffler, at leats 80-85mm main pipe, bigger if you can. For the turbo there are several actuated T3s you can use to get you into the 300hp neighborhood. An SAFC will get the job done but it's not really the best way to go. If you can get something more comprehensive like an E-manage or PFC that would be a lot better.

You don't need a metal head gasket or studs for a 300hp RB20.

[monkeyofdrift]

can I make 450~500hp without the greddy intake manifold? everything upgraded New turbo, injectors, turbo manifold, Power FC, Z32 MAF, and etc., everthing but the greddy intake mani.

[themadscientist]

yes. It would be easier with it but not impossible without it.

[jrb92se]

ive got a couple big jobs this month and when im done with them im gonna buy the greddy intake mani just so i can get rid of the stupid crossover pipe. with the greddy intake, pfc and the mods i have in place now i should be able to make over 300

[Yellow4g63]

Greddy Intake Manifold is RB25, RB26. No such animal for the RB20.

[IceSkyline25]

this is a really good thread since I also have an RB20 and was looking to make more horsepower out of it......

[ZenkiOwns]

I'd recomend a nice air filter, exaust and boost controller.

I have a K&N, HKS blow-off, apex'i GT exaust(way too big and loud for me) and a SAFCII.

That's okay for me now, my next investment is to put my t04e (+ all necesities)on and grab a boost controller.

Man i love my rb20

[xdream]

would bearing be needed??? they are expensive and im not sure why you would want new ones? is it necessary?

http://cgi.ebay.com/ebaymotors...ZWDVW

also does anyone have any idea where i can get some rb20 piston rings for a good reasonable price? or just get them anywhere at all?? that is what i really need asap.

[jrb92se]

if you know how to properly measure the journals and size the bearing id say go for it, if your car has a knock or something but if it runs strong just leave it...... also i didnt know they didnt make a greddy itm for the 20 sorry.... and yeah the best basic upgardes are k&n filter, boost controller and exhaust..

[Carl H]

if the motor was taken care of then im sure the old girl is just fine bearing wise, best not to mess with something that isnt broken.just run a good quality oil and change every 2.5-3kmi and you will be fine, remember to use a good filter too not that fram crap.

[IceSkyline25]

does any one know what's the highest amount of boost you can run on a stock RB20 with out messing up things......and does anyone by any chance have the vacuum diagram for the RB20 I've bee looking all over the place but can't seem to find one......

[Carl H]

boost != power.what you need to focus on is how much airflow is generated at how much boost.idealy pushing alot of pressure (boost) is not good for the motor as it increases internal stresses and breaks things.

[Yellow4g63]

I never noticed your in Ontairo Xdream. Hit me up sometime I'm in Moreno Valley. There is a shop in San Bernardino that has helped me with my RB20 from time to time and I dyno there too.