looking for the 400 whp mark :-) hx35 turbo

[SicSX]

so heres the plan, hx35 turbo on my RB20. im shooting for 400+ whp

this is what i need help with though, i need to know everything im going to need to make this work right.

iv got an safc2 siting around ill prob put on enless i get some more cash. im not really on any budget, but id like to stay under 1500 for all the parts.

what do you guys recomend for injectors? and i also plan on a z32 maf. i kinda have one siting in the shop. lol.

wastegate? downpipe? stock manifold? this is what i need to know.

thanksbtw, i searched but didnt find much that had detailed info.

[Yellow4g63]

so heres the plan, hx35 turbo on my RB20. im shooting for 400+ whp

this is what i need help with though, i need to know everything im going to need to make this work right.

iv got an safc2 siting around ill prob put on enless i get some more cash. im not really on any budget, but id like to stay under 1500 for all the parts.

what do you guys recommend for injectors? and i also plan on a z32 maf. i kinda have one siting in the shop. lol.

wastegate? downpipe? stock manifold? this is what i need to know.

thanksbtw, i searched but didnt find much that had detailed info.

Z32 maf, 550cc or better injectors, throw that SAFC into the trash and pick up a romulator+free software+software thats not free and rom tune the stock ecu. Use your stock manifold and get a external gate welded onto it. Ohh also don't forget to plant the money tree because things don't always work out the way you want it too.

[Cameron]

hmm idk about using the stock wastegate on them as they are 17psi wastegates i believe, and it prolly would come in contact with the manifold, but if you go this route, you can either get another manifold, tap your own for an external gate, which could be costly, because with it being a 10+ y/o manifold and cast, and as hot as it has gotten, it might just crack and ruin it. or get a bullseye housing for a hx35 that can have a huge 38mm internal gate installed and then just get an Actuator. injectors wise i would say, either 650's pushing it close depending on your fuel pressure or 740cc's and not worry about maxing them out.

as far as downpipe, you are going to need to custom fab a new dump pipe, since hx35's have the vband flange. and then do your down pipe from there.

but if you went with the bullseye housing, they have the standard DSM 4 bolt style and it would be easier probably to go with one of those.. they are only $160 and for $50 dollars more a 38mm gate can be installed like i said.

they are 7cm2 or 0.48AR housings for the HX35 and i think for the HX40's they are either 10cm2 (0.73AR) or 11cm2 (0.81AR)

but deffinately ditch the stock wastegate on the hx35
Modified by ZenkiCam at 9:04 PM 1/2/2008

[rb20s14]

about how much do you want for the afc

[SicSX]

hmm.. doesnt sound as hard as i was expecting. i am an ASE cert tech at a local dealer ship so i have every thing i need at my dispense, but i have never tryed to put a deisel turbo on a car before.. what about oil/coolant lines, and do i need a diff intercooler? im runing a crappy ssautocrome one right now that was hard to put on in the 1st place. lol.

im prob just gona give the safc to my friend that is doing a honda bild. or ill just use it as a temp solution. not sure yet.

[SicSX]

http://www.theturbotrader.com/...id=36

is that the flange your talking about?

[Cameron]

yes thats the housing im talking about you will have to do custom turbo lines on any turbo cause a different turbo will not be in the same location as stock. but as for intercooler, no. an intercooler is an intercooler, and its not like its diesel air running through it lol. its clean compressed air, only thing you would need to do is get new piping made to work with the holset turbo, and probably clock the turbo

[Cameron]

but this would prolly be a better deal idk...

http://www.theturbotrader.com/...id=56

[Sky80]

but as for intercooler, no. an intercooler is an intercooler

Im sorry, but an intercooler is not an intercooler... a ssautocrap intercooler is no where near as nice and efficent as a garrett core intercooler.. I guarantee you will not make it to 400whp on your rb20 with the mods you are talking about so far.. the turbo is a great start... but it is alot harder to get to 400whp on an rb20 than you think

[govtworkhorse]

Well this topic has been thrown around th forum forever. SSAUTOCRAP has been tested by a lot of members and the conclusion was that it isn'y a bad intercooler and will not affect performance.

But that is neither here or there because I was curious about the HP goal. It is to my understanding that an RB20 has a limit of right around 400 crank horsepower on stock internals. This is far from 400WHP. So I'm curious why no one has mentioned things like con rods and pistons, etc.

[Cjmartz2k]

I don't have any problem with cheap china/xssutocrap intercoolers. No, they may not be the best, but unless they leak, the difference isn't that big of a deal. I run one, and I'm making a bit more than 400rwhp

That being said.... 400rwhp out of an RB20 is about the normal limit. I'm not saying you can't get more, but it's REAL hard with a stock head, cams, displacement, etc. I think you can make it with that turbo, but it's going to be at 1.5bar. I assume this is a stock motor, right?

*EDIT* I typed that before I saw the above post. Great minds think alike....I don't know what our excuse is though

[Coolwhip]

+1 on the Cheaper intercooler cores. Mine concern on them is endtank design. And since most are copied off proven design your good to go. Andy (booztd3) has one on his Z making over 600whp.

I also second that limits of 400whp is where you'll reach with the RB20. However, the Rods and such can still make way with a rock hard tune.

[nizmo zilvia]

I think the RB20 can make more than 400rwhp on stock internals. Been proven. Just no one pushes it cause they decide to jump on the RB25 instead

[govtworkhorse]

Well now I feel dumb. lol For some reason I thought the bottom end was near it's breaking point at 400 crank. Well, I stand corrected. And I'm kinda stoked as I have really been stressing on my build list so not to exceed that mark.

[Cjmartz2k]

I think the RB20 can make more than 400rwhp on stock internals. Been proven. Just no one pushes it cause they decide to jump on the RB25 instead

True and true, but not really. The RB20 head has smaller ports to promote better low end response, but chokes it out above 400hp or so. Like I said before, it can be done, but it's pretty hard with just a stock motor taken out of one car and slapped into another. Take it apart, port/polish the head, cams, intake, HG, and slap it back together, and you can do it. Please do!! RB20's are a lot harder to break! They don't share the same ring land weakness as RB25's as far as I know.

[Shocker]

If supra guys making 1000rwhp at 30 + lbs of boost use ebay intercoolers I dont see it as a big deal. My last two are ebays.

[nizmo zilvia]

Yea if only the RB20 had a better head it would be a killer stock motor. I would do a head job or build it. Theres something about these motors I love which I can't really point out.

[BoostFab]

you all are killing me with this forum-dyno. here's what you do: get a new set of piston rings, new aftermarket headgasket, fuel pump, oil pump, water pump. big turbo, injectors, standalone/rom-tune; i am pretty sure it can put out over 400whp with a good tune. he11.. a tiny honda motor b18 put down 400whp stock block, make the rb20det sounds like a wussy 2.0lt inline 6

[nizmo zilvia]

Why change the bottom end? Leave it as be but only change head gasket and add APR studs. Thats it. Get a nice EMS and tune the hell out of it. Its more simple then it sounds.

Changing water pump and all that good stuff should have been already done when the motor was swapped out. Its all common sense really. Hardest part will be pushing it to what you want so a good tune and setup is what you need.

[johnzm]

where are you guys gettng all this mis-information?

talk to ANYONE who has blown a rb20, they blow the ringlands.

so 400 is doable. in fact a few on here have had 400whp. but they cracked the ring lands.

anyways have fun, and be ready for it to blow up at 400whp with an AFC for tuning

[nizmo zilvia]

Rarely I see a blown RB20 and when I do its due to the fact it had some poor tuning. I don't remember if I said this or not but it also has to do with your setup.

[BoostFab]

Why change the bottom end? Leave it as be but only change head gasket and add APR studs. Thats it. Get a nice EMS and tune the hell out of it. Its more simple then it sounds.

i suggested put in new pistons rings because many rb20 came over with high mileage and can have a lot more blow by and lower compression, new rings will bring more power and life to the motor. that's pretty basic.

[BoostFab]

where are you guys gettng all this mis-information?

talk to ANYONE who has blown a rb20, they blow the ringlands.

so 400 is doable. in fact a few on here have had 400whp. but they cracked the ring lands.

anyways have fun, and be ready for it to blow up at 400whp with an AFC for tuning

crack ringland = detonation = poor tuning. period. it can happen to any motor, not just the rb20

[nizmo zilvia]

i suggested put in new pistons rings because many rb20 came over with high mileage and can have a lot more blow by and lower compression, new rings will bring more power and life to the motor. that's pretty basic.

Gotcha! Yea I would do it too, but if you pull the head and see the condition on them you'll decide right then and there.

[Cjmartz2k]

http://www.skylinesaustralia.c....html is where I get some of my information. Seeing people build them here on island is another. I didn't say it can't be done, but I said it was really hard and the head doesn't flow for crap. 400rwhp (about 450 crank hp) is HARD to do with an RB20, but not impossbile. O yeah, 20's seem a LOT harder to blow up than 25's from what I've seen come pulling the the shop too.

[yotik]

sorry to resurrect but i was wondering what type of power an rb20 would make on the stock 17-18psi hx35 boost. reason being, my hp goal is between 375-400 so im wondering if i need to spend the extra cash to go external on the wastegate etc. thanks for your help guys!

[Yellow4g63]

only one way to find out and it's to try it. You might get there just get it tuned right and keep it safe.