SR20, RB20, RB25? BEST daily driver and weekend warrior!

[dank311]

hey

here's the deal, UH was supposed to get me a redtop but its been 4 months and now they said they can MOST LIKELY get an RB20/25 faster. so here is my situation...This all for my 95 240SX(S14)- probably weighs 2700-2800lbs...I have a FMIC, intake, BOV, fan kit, clutch, flywheel, boost controller, turbo timer, exhaust, downpipe, and gauges, and i was planning on adding a T3/T4 turbo (or something that is able to have the most streetable power with a 350-375 range on the street and 400-500HP range for the track and weekend fun) and a few extra goodies for the new turbo(ECU retune, injectors, manifold, ETC)...I WANT TO RUN 10-15 PSI on the STREET and around 20+ PSI at the Track..i probably wont be in any competitions, this is just a hobby and to have fun before i die. my questions is..if i put all this on a SR20 how much HP/TQ, 1/4 time for street and track settings would i get(estimate)? for the RB20 Hp/Tq 1/4 time? for the RB25 HP/TQ 1/4 mile time?

i was thinking that the SR20 or the RB25 would be the best way to go...i just want to have all of the bolt on's and an upgraded turbo package w/o spengin an extra 5 grand doing the internals, but i also want it to be reliable at the same time. What engine has the strongest internals?...FOR EACH ENGINE, what HP do the stock internals hold?? i dont wanna spend the extra money on the RB25 if i can get to my HP and 1/4 mile ET goal w/ an SR w/ the turbo upgrade...what do you think would be easier, more reliable, more fun to drive, and easier to find replacement parts in case something broke...

also i have researched thourgh many nissan boards and everyone says the I6 has more linear power and doesnt feel as peaky as the I4(SR0)...what exactly does the mean? how does the driving feel different?? i have never driven a turbocharged car before.
ANYONE please post your opinions/flames/ideas or whatever about the decision b/c i have to decide in a few days and i need to know all the good and bad about each engine...oh, and BTW, dennis at unstable hybrids has gotten in touch with me and he is a very nice guy and his helping me out greatly now with getting me an engine ASAP...thanx
Jon

[J SPEC SilEighty]

On the sr, you wont get 350-375 at 10-15 psi just because of the smaller displacement and not putting out as much exhaust gas as a bigger motor would. On the SR at 10 psi, 7500 RPM (redline on S13 SR), .85 volumetric efficiency, 12:1 air/fuel ratio, and a .55 BSFC, you will get around 260-270 HP. With all those same variables but 15 psi on the SR, you will see around 310-320 HP. Of course all of that could change significantly depending on how your motor is running. Say that you have a very good engine management control system and you are running as lean as 10.5:1 air/fuel ratio then you will get around 300 HP at 10 psi and 360 HP at 15 psi. So that would get you to your power levels but 10.5:1 is very dangerous and you have a good chance of destroying your motor. To get to 350-375 with all of the first variables I used, you would need to run around 19 psi. On the RB25 though, using all the same variables as the SR, then at 15 psi you could have just shy of 400 HP due to the larger displacement. For the times, you can use this as an example.... Aubrey in the Atlanta area currently has 343 HP and 320 lb-ft of torque on his S13 SR and he is running mid 12's on street tires.

It sounds like you've got a nice setup going on so far. Hopefully you will get your engine soon. The T3/T04E turbo would be a good choice for a street driven car and one that you can still take to the track and put down good times. For the SR20, the highest HP on stock internals I have seen is 350 HP, but some say it can handle up to 400 on stock internals. As for the RB25, I'm not really sure.... I think that the SR would be easier to maintain then the RB just because there is more and more support for the SR here in the states all the time. So if something broke, then you could probably find the part you are looking for here in the states.

Hope some of this helped Good luck on your project