Noob Questions on B16A Fuel mileage etc.

[Varao]

I have a JDM B16A in my 93 Del Sol Si that came with a D16Z6 and I had a few questions on the fuel management. Any and all help is appreciated.

1) What kind of gas mileage should the B16A be getting with 91 octane? I am not getting that good of mileage right now a full tank will get me right around 250 miles use to be alot more. I know it will never be as high as the D-series but does that sound right?

2) With this swap I didnt change out teh fuel pump or relay. Should I get those parts and if I do what difference will it make? Should I get one or the other or both?

3) I am curently running the D16Z6's injectors and fuel rail. Do I need to get the B16A's fuel rail and new injectors?

4) What are the benifits of getting a Fuel Pressure regulator running all motor? Is it worth it if so what brand or features should I look for when buying one?

Sorry for all the noob questions but it would be a big help if someone could help me out thanks in advance!

[M@]

1) I think with my B16A2 N/A I was getting around 320 a tank.

2) A bigger pump will only make your mileage worse.

3) How in the hell are you pulling that off? As far as I knew the D-series rail wouldn't fit the B-series intake mani.. maybe I'm wrong.

4) You'll only want to run that if you plan on increasing the air intake (indiv. t/b's, forced induction, or even n2o). And even then, you won't really need it unless you start getting pretty serious with the build.

[2genCRX]

i get around 25-29 mpg with my crx b16a 1st gen 91 oct. i feel thats pretty good

[ChewiSi]

I get about 280-300 on my turbo'd b16 right now. if i beat on it every day, now thats a different story.

[STIBungy]

I was getting around 28-30 mpg on my oil burning B16A.

[M@]

I get about 280-300 on my turbo'd b16 right now. if i beat on it every day, now thats a different story.
I was about the same on the turbo. Normally was right around 280, if I was nice, it was like 305.. if I was really mean, it was 250ish.. heh.

[Varao]

Thanks for the help guys so I guess its about right then on the mileage. Yeah the rail dosent bolt up to the intake mani its a little jerry-rigged right now. I better get one of those.

[B20badboy]

Hey I got a JDM B16 as well na with a Fuel Pressure regulator and I am pulling like 350Km as my guage cluster is JDM as well. The motor is na now and am boosting very soon. I do know with my motor I always put 91 octane in and i can run for about a week and a half (10 days or so) But it is hard to remember since I havent driven my car since the last race of the year. That also depends on how hard I get on it I like to go to 8K+ all the time.

[floored4door]

http://i18.photobucket.com/albums/b148/Floored4door/Random/stfunoob.jpg

hahah JK!

[oldskoolracer]

after we had servion put the sol on the dyno boosted ls we were getting
about 26-27 in city and 34 on the highway

[Varao]

http://i18.photobucket.com/albums/b148/Floored4door/Random/stfunoob.jpg

hahah JK!

Indeed SHAHAHAHAH!;NutKick;

[Mark_H]

Do the JDM B16A's require 91 octane? If not, try 87 and don't beat on it. I bet you would see 300+ a tank.
I'm sure we've had octane vs. mileage arguments before but higher octane generally produces worse mileage because it burns hotter. Somebody feel free to correct me if I'm wrong.
Mark

[blackciv4]

I have a bone stock SI and I get 250-280 out of it just driving around town.

[Varao]

Hmmm I guess I am at what is normal. Just wierd going from the D16 to B16 to see that big of a difference. As long as thats what it should be doing I am happy!

[Enthalpy]

after we had servion put the sol on the dyno boosted ls we were getting
about 26-27 in city and 34 on the highway
With good EMS tuning using a load-holder, you can get fantastic mileage! My EMS-ed 309 rwhp turbo MR2 2.0 liter gets 34 mpg after I tuned it. This was recently measured to and from Castle Rock doing 65-75. I could get better if I did 55.

[boostedEG]

well first off all del sols, civics, etc (can) all have different sized tanks. my HF crx was 8 gallons, my DX crx was 11 or 12 gallons, so lets not speak how many miles your getting per tank, but how many miles per gallon.

bigger fuel pump wont effect mileage, and you dont need one, neither will bigger injectors, and you dont need those either.

fuel pressure regulator... well if you leave it at stock pressure where you want it (for your stock motor) then it wont do a damn thing. if you add fuel pressure you will get worse gas mileage and probably lose a little power. if you make it go lean you mike get SLIGHTLY better mileage but you dont want it to be lean. most likely whats causeing your worse gas mileage is not the B16 engine, but the B16 tranny, its geared really low/short, and keeps you in high rpm's. get yourself an LS 5th gear.

[ChewiSi]

A b16 requires 91 octane b/c you'll start knocking if you stomp on it (from what i've heard)

[B20badboy]

A b16 requires 91 octane b/c you'll start knocking if you stomp on it (from what i've heard)
I know the comp is like 10.2 or 10.4.1 and I don't want to take the chance of not running 91.

[Zach]

when i had my civic, (now nxbrennan's) i would use 85 all the time. for the first month or so i ran strictly 91, but after i accidently put in 85 one time, and didnt experience any knock whatsoever, i ran it exclusivley. i would get 34+mpg city, and better highway.

[Mark_H]

A b16 requires 91 octane b/c you'll start knocking if you stomp on it (from what i've heard)

Hmm, can comebody with a 99-00 Si check their owners manual to see what it reccomends? I'm just curious here. I used to have a turbo Si and got away with 87 octane with no knock on 7-8psi(stock motor,stock compression). I got away with 91-93 octane in my turbo ITR running 14psi(stock block and rods, 9.2-1 compression)
I speak simply from experience and what I've read in the past but lower octane generally gets better gas mileage. There is a technical/scientific reason for it but I just have no desire to retain or worry about that type of information. So somebody may or may not chime in with that info.
Mark

[Varao]

I just wanted to make sure that I wasnt running something wrong. But as long as everything is right I am happy.

Also does anyone know the tank size of the 93 Del Sol Si. I was curious to find out. I dont trust gas pumps cause its always different at everyone. So if someone knows the factory size that would be great.

[ChewiSi]

Hmm, can comebody with a 99-00 Si check their owners manual to see what it reccomends? I'm just curious here. I used to have a turbo Si and got away with 87 octane with no knock on 7-8psi(stock motor,stock compression). I got away with 91-93 octane in my turbo ITR running 14psi(stock block and rods, 9.2-1 compression)
I speak simply from experience and what I've read in the past but lower octane generally gets better gas mileage. There is a technical/scientific reason for it but I just have no desire to retain or worry about that type of information. So somebody may or may not chime in with that info.
Mark

It does require 91 octane, I have a 2000 Si. b ut i think the jdm motors might be different???LoL, I am 100% sure the b16's are 91 only/

[blackciv4]

It does require 91 octane, I have a 2000 Si. b ut i think the jdm motors might be different???LoL, I am 100% sure the b16's are 91 only/

The JDM B16 has a slightly higher compression than the US version. The US B16 is 10.2 and the JDM is 10.4. IMO I would only run 91, but that is just me... I wouldn't want to find out the hard way.:)

EDIT: I check the owners manuel and it states 93 is to be used, but 91 is what we get, damn altitude.

[boostedEG]

It does require 91 octane, I have a 2000 Si. b ut i think the jdm motors might be different???LoL, I am 100% sure the b16's are 91 only/


thats at sea level though. my friend ran 85 in his B16 del sol (now mine) with no problems.

and if you run too low of an octane it wont knock and break shit, it just pings, and wont really hurt anything, however if it pings you do need to run higher octane.

and yes i know pinging and knocking are the same thing, but generally knocking is considered to be a lot more severe.

[Mario]

The JDM B16 has a slightly higher compression than the US version. The US B16 is 10.2 and the JDM is 10.4. IMO I would only run 91, but that is just me... I wouldn't want to find out the hard way.:)

EDIT: I check the owners manuel and it states 93 is to be used, but 91 is what we get, damn altitude.

91 at altitude is the same as 93 at sea level, that's why most pumps only go to 91. :)

[im_slow!]

if anything, the japanese would run higher octane levels to deal with their rigorous air restrictions. had a 99si and its recommended that the owners run 93.