Careless Posted November 30, 2007 Share Posted November 30, 2007 I've never really heard of quite literally going with like parts and not going turbo for that reason, but pushing for na power is commendable either way. Quote Link to comment Share on other sites More sharing options...
CArFAn Posted November 30, 2007 Share Posted November 30, 2007 I don't think anyone touched on the gas mileage you would get if driven daily and making 400-450hp. I would like to know. Quote Link to comment Share on other sites More sharing options...
getoffmyinternet Posted December 1, 2007 Share Posted December 1, 2007 I think that's because to have the mindset of wanting 400hp you have to also be thinking gas mileage isn't an object. No matter what you do, more power equates to more heat, more wear, and more gas. That's why these guys run dual 255lph pumps... I'd be more interested to know what they make stock and go from there. Sometimes it's quite a surprise. My jeep got 15mpg and I was thinking that doesn't make sense. What am I getting out of a car if it is neither built for power or for mileage? I'll take 10mpg if it's a 10s car, or 50mpg if it's top speed is 65. Some have claimed that turbos and blowers greatly increase mileage, but the only reason people see lower is because they strap them on to be able to punch it more. They say that this is because the turbo especially makes up more power than it uses, but fundamentally that doesn't make any sense to me. A machine that produces more than it uses. By definition, the more complex a machine, the less efficient. Obviously a turbo increases power, but that's simply because it lets the engine stuff more fuel. Anyway it all depends on the car. I'm gonna try to find out what my rb26 gets completely stock after I put it in, and hopefully the number won't deter me from any upgrades. In retrospect my buddy's 72 dart 318 gets like 10mpg, and that's what I call poopdick. But I digress. Quote Link to comment Share on other sites More sharing options...
Racinjitter Posted December 3, 2007 Share Posted December 3, 2007 My stock Rb25det in my 88 300zx gets between 25-30mpg on the highway. When I drove to the drag strip (90miles) made 8 runs and came home (90miles) I averaged 22mpg. At the strip I turned up the boost to 13.5psi. Quote Link to comment Share on other sites More sharing options...
Careless Posted December 3, 2007 Share Posted December 3, 2007 My stock Rb25det in my 88 300zx gets between 25-30mpg on the highway. When I drove to the drag strip (90miles) made 8 runs and came home (90miles) I averaged 22mpg. At the strip I turned up the boost to 13.5psi. you... me... we gotta talk about z31 RB's. Quote Link to comment Share on other sites More sharing options...
Racinjitter Posted December 4, 2007 Share Posted December 4, 2007 you... me... we gotta talk about z31 RB's. Anytime Raff!.... anytime. Anything I can help you with I will! Quote Link to comment Share on other sites More sharing options...
triple B Posted December 4, 2007 Share Posted December 4, 2007 yeah racinjitter has been a big help on my RB project in my Z31. he only lives like 2 hours away but still we have not met up at the track or in detroit yet to swap car stories Quote Link to comment Share on other sites More sharing options...
Careless Posted December 5, 2007 Share Posted December 5, 2007 Anytime Raff!.... anytime. Anything I can help you with I will! LoL. I'd like for you to visit my Z31 at my parents house when you're down here for the engine. I'll send you and scotty pics first. There are others that also asked for em, but seeing as you'll take the one with the casting slump aswell, i'd be more inclined to sell to you cause getting it sold was part of the deal for me getting the other block. Raff Quote Link to comment Share on other sites More sharing options...
Booztd 3 Posted December 5, 2007 Share Posted December 5, 2007 Go both, thats what I did.... And the transplant for my S14.... Quote Link to comment Share on other sites More sharing options...
aziza z Posted December 5, 2007 Share Posted December 5, 2007 btw about the oiling problems that the ls motors have (mentioned by Mikelly earlier in this thread), that seems to be a very easy fix. A catch can can be placed and the switching out of the pcv valve to the revised pcv valve (GM part #12572717)will fix this problem. oh yea and theres companies that already sell the catch can for the ls motors. http://www.eliteengineeringusa.com/Catch_Can.html Quote Link to comment Share on other sites More sharing options...
Booztd 3 Posted December 5, 2007 Share Posted December 5, 2007 For all you guys worried about bad gas mileage this, bad gas mileage that...........GAS MILEAGE ISNT IN THE PARTS - ITS IN THE TUNE! We have fuel systems with returns, that means we're recycling what we're not using.......if you can get your hands on one of those fancy standalone ECU jobbies, and be on the hook with a good tuner, you'll see amazing gas mileage. I average 30+mpg on the highway and 24-25ish in the city on my 550rhwp daily driven tune......and if you really want good gas mileage, keep your foot OUT of the pedal Quote Link to comment Share on other sites More sharing options...
getoffmyinternet Posted December 7, 2007 Share Posted December 7, 2007 Do standalone ECUs really help? It pretty much goes without saying that your foot has a heck of a lot to do with mileage. But it's just so dang hard to control. I don't know about it not being in the parts though. If you get wild cams and whatnot to advance your timing and increase compression, there seems to be little your foot can do to keep your mileage from going down. But I guess if you had an economy tune on your ECU, the fuel rate you're adding with your parts would in turn cause the ECU to lean the mixture and counter it when you don't need the power, in theory. But whatever, I'm a leadfoot so it's not going to make any difference unless my car has so little power that I get good mileage even when I squeeze every available hp at all times, but then that's the exact opposite of the direction I'm going for. Would be nice to have different tune settings for in town though. My first major purchase will probably be a boost controller, which would help IF I ever get myself to turn it down instead of up. Quote Link to comment Share on other sites More sharing options...
scottyMIz Posted December 7, 2007 Share Posted December 7, 2007 i have no idea what my rb gets for mileage but it doesn't matter no v8 can sound like an rb Quote Link to comment Share on other sites More sharing options...
Racinjitter Posted December 8, 2007 Share Posted December 8, 2007 i have no idea what my rb gets for mileage but it doesn't matter no v8 can sound like an rb LOL!!! Aint that the truth. RB sound ftw! Quote Link to comment Share on other sites More sharing options...
CArFAn Posted December 8, 2007 Share Posted December 8, 2007 I like the sound of both, but i would like to get a decent gas mileage at 400 or so horsepower. I have to make 120(includes both ways) mile trips every other week end.The RB sounds sick as, but the LS1 sound like a monster raping something. RB is cheaper but parts are sorta hard to get, ls1 cost more and parts are easy to get but I'm on a real tight budget.( i read all the threads on the cost of a RB and LS1 swap) I know how much it takes for a complete swap. And I'm going to cut out the middle man to save money and do as much work i can myself. Quote Link to comment Share on other sites More sharing options...
getoffmyinternet Posted December 9, 2007 Share Posted December 9, 2007 Is the rb really cheaper? Parts may be more, but the bigger issue is finding them. I don't like most of those threads on how much it costs. I think it's a reaction to how people always underestimate that they go and do the complete opposite. Quote Link to comment Share on other sites More sharing options...
getoffmyinternet Posted December 9, 2007 Share Posted December 9, 2007 Will you have any exhaust tips for me? I sure don't wanna screw that up. I'm especially curious at the sound difference between single and dual exhaust and also different pipe sizes. Quote Link to comment Share on other sites More sharing options...
Cal Poly Zmanaustin Posted December 9, 2007 Share Posted December 9, 2007 RB is cheaper but parts are sorta hard to get, ls1 cost more and parts are easy to get but I'm on a real tight budget.. I don't know where you are getting your figures but I can assure you the RB is NOT cheaper. There is a reason RB and cheap don't come up much on the search function. Quote Link to comment Share on other sites More sharing options...
CArFAn Posted December 9, 2007 Share Posted December 9, 2007 Compared to buying a ls1 motor set (not a front clip) is upwards of 3k (ebay prices) and a rb25 (not a rb26) is under 3k for a full front clip from venus auto. Other locations are will have different prices but where i have looked the ls1 is always higher. It cost more than just the motor to do i swap. i understand. Im just saying the motor it self is cheaper than a ls1. Quote Link to comment Share on other sites More sharing options...
getoffmyinternet Posted December 9, 2007 Share Posted December 9, 2007 I was thinking you were comparing prices with the 26, which is a big difference. The 25 itself would probably be attainable at like $1500 minus the trans. Quote Link to comment Share on other sites More sharing options...
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