scottyMIz

hey guys finally got the 300 rear swapped in and it works perfect, had to remake the rear toe arms so the bags would lift the truck. for those who dont know i have an rb25 already swapped in and has been dubbed skynoma

i swapped the rb20 into my sonoma and i loved it, The main thing is that the tq is low so off boost power is crappy with a bigger turbo, my truck is heavy so it made it worse. Stock form they have basically no lag but the turbo craps out on top end so i switched to a t3/t4, Once the turbo hit at 3500rpm the rb20 is very impressive as it pulls hard to 8k.I did break a piston or two in mine as they are weak and the only time it broke is when i had the haltech on it and couldnt tune it out because of the cas. I havent had my rb20 apart yet but i think another thing that the rb25 has and the rb20 doesnt is the oil squirters under the pistons (i could be wrong). I have since switched to an rb25 in the truck (it was only 500 bucks), i love both motors and would recommend the rb20 to anyone looking for good power at a low price. I am going to rebuild my rb20 and drop it in my 1967.5 SPL311, light car and that engine should be very good. One good thing about the rb20's head is that the exhaust manifolds are the same with the rb25. The rb20 along with any engine will make great power when built and tuned right, i wanna see more of the buiild on the rb20, and for 100 bucks? dang man send it to me

lol its ok raff i wanted the rb25 but i figured the 20 would be neat since i didnt have one yet. I did and still do like the engine but like you said the truck is too heavy. I didn't knwo it was so heavy til i weighed it after the rb20 was in. Im guessing its a ring or ring land since my compression is low on number 3. I have the pistons to fix it just gotta pull it apart and swap the piston and rod, then its going in the 67 roadster

well i broke the number 3 piston in the rb20 so for the bargain price of 500 bucks i got a rb25 long block. I finally got it in and runnin here are the pics and a short vid, sorry for the quality

ok the battleship has sunk here is the new look

here is mine same as jc's but they just have a polished lip, this is now i have 1.5" spacers coming hopefully tomorrow so it doesnt have the "battleship" look as racinjitter calls it fronts are 16x7's backs are 16x8's fronts are 15mm offset backs are 0 well worth the 290 bucks i spent on em

the rb25 should bolt right up to the engine and mounts, i love my rb20 i beat the crap out of mine and keeps coming back for more. Your new intake wont work on an rb25 unfortunately, all the bolt patterns are different on the plenum halves and head mounting.

i got the gear swapped in yesterday and the posi unit, the speedo is right on the money now 100kmh=61mph. The accelleration is much better in all gears 60mph is at about 2600-2700rpm but the vibration moved down to 60mph. I didn't go much faster than 55mph all the way home but it cruised great and i am sending the driveshaft to the driveline shop today. I have a new clutch coming hopefully friday and should have her back together this weekend. I am going to try and turn the boost up again too see if i can get a bit more out of it. Im thinking the tubing was closing when i had it up before, worth a shot i guess then maybe one more track day before the may 9th meet

over on nicoclub.com they have this discussion all the time, basically it's all up the the person doing the swap. They both make about the same power, sr weighs a little less, both respond good to mods. if you want to find out more you can goto nicoclub and look at their multiple discussions, most of the topics are old and there is alot of personal preference in them but there is good info there.All in all it's up to you and how much fab work you want to do.

I bought my rb20 from jdm engine zone in clifton NJ not sure if that is the same shop or a different one. If it's the same they are a good bunch of guys and tell them the guy with the rb20det powered sonoma says hi, the truck is running great!(they like my truck) When i did my compression test it was about 130 across the cyls the actual psi will vary depending on the gauge your using. My gauge is a cheap harbor freight gauge but the main thing is that they are very close in readings from cyl to cyl and that the gauge reads a reasonable amount.

well i figured out why the truck was blowing oil out at the end of the track. I swapped the t3/t4e onto the truck as i stated above but i noticed that the truck would fall on its face under full boost. It did it only when the truck was warm and at first i thought it was the wastegate til i saw that it was pulling vacuum when it would drop out. I got to thinking and after a few adjustments to the wastegate i figured out why it was falling on it's face and why the truck blew oil at the track. The inlet hose hooked from the turbo to the maf was getting soft and would buckle under the suction from the shock on the stock turbo, on the t3/t4e would pull it shut with the added power and suction. So i put a piece of tubing into the inlet of the tubing until i can make a custom one that i can route to the front. The moral of the story is i put the bigger turbo on for no reason........ well at least it does have more power

lol its ok jason, i was just gonna tell you about the run and that i got the t3/t4e on it now. Its laggy as hell but pulls good on top end, i think i need a smaller turbine housing a .48 would be perfect. the wheel hop and spinning really sucks in a truck, plus the weight of the old girl all in all it did do good.

heres another can hear it better

stock single for now i think it's bad anyway, truck weighs 3600 lbs without me in it and i think about 1/4 tank of gas when i ran today i filled it up. The gearing is still way off too so that will help along with a turbo upgrade. Best 60 foot sucked it was 2.4 i need some stickier tires im gonna take the turbo apart tomorrow and see if the seal is bad in it. If i get ambitious i might just put the twins or the t3/t4 on it but we are expecting snow and i dont wanna drive my zx in the snow while the skynoma is apart. in this vid i think i ran a 15.3 that red g8 was brand new still had the sticker on it. There was a sweet supra there like 97or so, last body style. The kid sucked at driving but it had hella power he was trapping 120's but only running 13.5 . here is the vid

well guys not super happy with the results but not totally devistated. Track was slippery and i had turbo problems, 10psi was max boost that i could get. After a few runs i would get a crap load of oil out of the turbo blowing into the engine after i let off the throttle. The pressure pipe out of the turbo was saturated with oil when i pulled it off and there was shaft play up and down on the turbo. I was thinking it was maybe blow by at first but it ran no prob until i let off the throttle then it would load up with oil and smoke like crazy. My best run with the 20" wheels on it was 15.3@90mph then i swapped on the skyline wheels and i ran a best of 15.0@93mph. I think i could have got 14's if the turbo would have been working properly and if i could get traction. I have a heck of a time getting traction most the time it wheel hops, i have a four link in the back with air ride so im gonna try stiffer shocks and see if that helps. i'll post some vids when i get time tonight. what do you guys think?

best way i found to tell its the afm is to take the cover off and rev it up if it hangs up use ur finger and push the arm inside a little one way or the other. If it revs up more just by moving the arm then it's off and can be adjusted by loosening the screw and turning the wheel in the direction it ran better.

sad to hear man but it is good to know, from what i read he said he was shooting a 200 shot of nos is that right?if so basically anyone running in the 20's of boost should be just fine. I ran mine at 25psi for a long time before the haltech finally did the engine in. I had big problems with the haltech changing timing when ever it felt like it cuz of the stock cas wheel. I too would rev it up to 8k pretty often and rev my rb20 to 8k all the time. How much would 1 inch change everything for you?

thanks

thanks legit, the rb20 is in my 99 sonoma. I dont mind the fabbing and i plan to run a ms2 on it, just gonna mod the cas to work with the rb's direct coils. I plan to make my own intake manifold as well as the ic piping off of the turbos. The dp's should be just fine and the exhaust should be pretty straight forward. I was just worried about lag on the twins, would you or anyone know what the max boost is on the stock rb26 turbos?

it does look nice and i cant wait to change my turbo to a better one. I just have two filters on mine but after a while the filters get saturated and it pushes oil out on the valve cover. I think i am gonna get a catch can and plumb it so it works to keep the oil from getting on the manifold. I get more oil on the exhaust side than the intake side so it makes sense to make that the outlet and the intake side the inlet.

got mine for 1200 and i love it i say go for it

sanded down the white part of the back of the speedo so the 200sx cable will screw on. Also i had to cut a little off the end of the outsideof the cable that goes in to the speedo. The center kept workin its way back inside the cable so i just used a pipe cutter to cut about 1/2 inch off then reflared it with a pair of needle nose pliers.