1JZ BPU Gas Mileage?

[honestabe]

Just curious as to what everyone is getting for mileage on their BPU 1J's. I'm running a Walbro 255 LPH fuel pump, 3" free flowing exhaust without cat, cold air intake, and 14 PSi of boost. I'm thinking 13 if my foot is in it, 18 if it's out. I'll find out tomorrow what I'm actually getting, but I'm just curious. I figure on 6 full tanks of gas for my 1200 mile drive to Portland. Let's hear what y'all are getting.

Adam

[AF1JZ]

I got 25mpg on the highway with a 3'' exhaust, chinaman y-pipe, high flow cat, 24x12x3 FMIC, at 11psi. This was also with the silencer in the muffler. Around town, I get maybe 15-18mpg. I don't really calculate it. I'm mostly driving my Lexus anyway.

[OneJArpus]

25 mpg is cool

im lucky if i get that in my 7m

[drewgo]

I am single with 468 rwhp.... On a good week I get 24.5 average..
If I goof off I'll kill my gas mileage.

[honestabe]

Sounds like this trip won't cost me anywhere near as much than. I'll report what my actual freeway mileage is when I get to San Francisco tomorrow night at Lau's house.

Adam

[OneJoeZee]

You've had a 1J for a while now. You should be aware what the mileage is like. :dunno:

[HIDPLANET]

I got 78 miles to a tank once :aigo:

[Ds650rida]

how big are the a70 fuel tanks?

i averaged about 21 mpg on a rich running 7mgte with downpipe, intake, catted exhaust & higher comp pistons

[honestabe]

Joe, I've had my 1J for over a year, but I've only put on 3000 miles during that time. I calculated it once to be 17 MPG, but that's city and freeway with both sane and crazy driving.

Ds650rida, the Supra's fuel tank is 18.5 gallons, with a 2 gallon sediment bin (16.5 gallons of usable gas, meaning when you run out of gas, you actually have 2 gallons of fuel left that your fuel pump won't touch).

[swaq]

Ds650rida, the Supra's fuel tank is 18.5 gallons, with a 2 gallon sediment bin (16.5 gallons of usable gas, meaning when you run out of gas, you actually have 2 gallons of fuel left that your fuel pump won't touch).
Are you serious? I've never heard this before. What is the purpose of a sediment bin?

[honestabe]

Dead serious swaq. It's supposed to catch crap in the fuel and prevent it from going into your motor.

[Spaniard]

So what happens when you go with a fuel cell? you just run a big ass filter? I think having two gallons of unusual fuel acting as a "buffer" if you will adds a lot of weight.

[Ds650rida]

sounds like dead weight to me thats a pretty big tank, i could only get about 14 gallons out of the pump when filling up, so your saying i had like another 2 gallon s of usable fuel left?

do 88's have like a low fuel warning light? i thought i saw one but it never went on idk if mine works or not, and i dont wanna find out the hard way.

[honestabe]

Yes, all MKIII's came with a low fuel light, and I'm pretty sure the MKII's did too. When you get a fuel cell, the inside of the cell should be filled with a special foam that prevents your fuel from sloshing around. I'm not sure if you need to add a filter on top of that, but I don't think you do. Although if you do, it doesn't have to be very big at all. I haven't heard of a fuel filter clogging up in 15 years, and that was in a Chevy Lumina.

Adam

[1jzMoe]

24-25 on highwas and ~18 mixed both on the gas all the time

[str8_6]

30mpg with normal driving and very few wot. i bet i could get more if i did no wot and precision fuel saver skills. its kinda hard to NEVER go wot though, sometimes you just have to speed up to get to highway speeds, its like that here. 35mph then all of a sudden 55mph.

i'm also single, so turbo does not spool as fast as the stock twins. also i think i average out better because i weigh less, less motor work, etc.

[bobiseverywhere]

Well to about 60 Liters i will Get anywhere between 300 - 400 km

I am pretty heavy with the pedal i guess

On the good side for me that works out to 15L/100km or 15.68 mpg that is mostly city and some highway

On the bad side 20L/100km or 11.76 mpg :3d_frown: :aigo:

My mods are very few.
Just and intake HKS Mushroom and a close to free flowing 3" exhaust no cat but stock Y-pipe the Exhaust has a res and a large muffler it is an HKS Turbo Cat Back Exhaust system. Everything else is stock. guess i need to work on that milage :(

I will push though between 13 - 14 lbs of boost usually and some time i'll hit Fuel cut at 1bar


BTW Our tanks have a total capacity of 70 Liters or 18.49 Galons

[honestabe]

Atleast I've learned to only drive hard when someone new is in the car, or when getting onto freeways (1st, 2nd, 3rd, 5th).

Adam

[Ds650rida]

damn i need to get my car done, i still have half a tank of premium in there!

[foreverpsycotic]

damn i need to get my car done, i still have half a tank of premium in there!
You think thats bad? I have a wrecked car in my garage that has 1/2 a tank of c16.

To add to this thread, i got 297mi to 16g

[annoyingrob]

I find it funny that over the years of mods, my car STILL gets the same milage that it always has. From stock 1JZ to big single standalone 1.5JZ

In the city, 60L gets me ~350km. On the highway, 60L gets me ~630km (even with boosting, and excessively speeding). I drive with a pretty big lead foot.

[Ken]

on my stock ecu i was getting incredibly shitty gas mileage. i used a whole tank to go to dallas, which is about 250 miles.

on my sard ecu it only takes half a tank to go 250 miles.

i avg about 24-25 mpg.

[SupraClaou]

damn i need to get my car done, i still have half a tank of premium in there!

Me to bro,me to.....
Let's get those motors fired up :icon_bigg
Tommorow I am going to work on the jz project,from 18:00 till 00:00.
With a little luck I should get it ready in 2 weeks :icon_surp
Can't wait that moment of me puting the key into the ignition :love:

[Ds650rida]

i need money, i still gotta get $1000 worth of stuff

with the 7m i got about 320 miles to 14 gallons cuz i'd always fill up at the same level and always came out to 14

[10secdream]

I am getting about 400kms of city driving in 50L on my 1JZ. Only mods are full 3 Inch Exhaust, HKS Front Mount Intercooler and an HKS Intake. Stock boost still as well. On the highway I get about 750km per tank.

[becauseican]

I normally get around 300-400 kms on a tank but have gotten as little as 240 kms on a tank with a very heavy foot and lots of racing. I get 450-500 kms on the highway. This is with a DBB SP61, 550cc injectors, 3.5" exhaust and a Mines ecu/ SAFC.

[viperkillertt]

HAHAHA! :aigo:

I got 78 miles to a tank once :aigo:

[honestabe]

Finally calculated my mileage on 92 Octane Oregon gas with hard driving, 15 MPG. Ouch! Average speed for 212.2 miles is only 21 MPH, so I'll count that as heavy footed city driving. I'm going to try driving gentle and see where that gets me. That, and getting some wider wheels.

Adam

[viperkillertt]

Mine have been super erratic. The first fill up after the swap i calculated about 21. I was extatic, after that it was like 16. Since then it has been between 12 and 17. I just changed my thermostat to hopefully help, but i am kinda worried. I really dont drive with a heavy foot, so i was expecting in the 20's. That really was one of the main reasons to do the damn 1jz swap. I do think i need a new fuel pump also. it is a bit fishy at low rpms and has run a little lean under boost. Nothing bad, just sticks at about 14.5 afr under boost some times.

[OneJoeZee]

Nothing bad, just sticks at about 14.5 afr under boost some times.


14.5 under boost is bad.

[viperkillertt]

i know, but i am also not redlining her, i have only taken her to about 4700rpm. That was when i had the bad thermostat in. The last fuel map showed 12.5 under full boost. I am being very careful. I am guessing it is just the 7m fuel pump. Anyone else have ideas? It has the little rpm bump at idle and lower rpm and leans out under full boost. Any other ideas?

[OneJoeZee]

12.5 is still pretty lean, man.

I'd be careful. I don't know if it's your pump or not. Could be on its way out.

I only had the stock pump in my blue car and it was fine running a 1JZ around 11-14psi.

[viperkillertt]

12.5 is still pretty lean, man.

I'd be careful. I don't know if it's your pump or not. Could be on its way out.

I only had the stock pump in my blue car and it was fine running a 1JZ around 11-14psi.

How is 12 lean? What are you running under full boost?

[supraracer49]

I say I have gotten anywhere from 12 to 25 mpg on mine. All depends on how you drive it with the stock twins

[annoyingrob]

How is 12 lean? What are you running under full boost?
It all depends on the tune ;)



My stock twins used to run 12.5:1 on the dot, and it was awesome. It had a very good tune though.

[OneJoeZee]

It all depends on the tune ;)



My stock twins used to run 12.5:1 on the dot, and it was awesome. It had a very good tune though.

You have a standalone.

[viperkillertt]

So again, i am wondering how 12 is considered lean?

[OneJoeZee]

How are you achieving AFRs of 12 or higher with stock twins and stock ECU? What's your boost set at?

12:1 AFRs are a little on the risky side for a stock ECU. Not worth it to me. I would tune it a little more conservative than 12.5:1. And definately not 14.5.

And with a stock ECU, you don't have timing control, which is an important part of a safe tune.

You might be able to do 12.5:1 and be ok but if that's the lowest AFR you're seeing and 14.5 is the highest under boost, you're asking for trouble.


conservative tune is 11.5:1 range. most lean youd ever want to go is 12-12.3:1 it will make a little more power running that range, but less room for error. 11.5:1 range you can make really good power yet still have a good margin of safety.



http://www.supramania.com/forums/showpost.php?p=159348&postcount=2

[viperkillertt]

Mine is a remapped ecu by Blitz. I believe they adjusted the timing.

How are you achieving AFRs of 12 or higher with stock twins and stock ECU? What's your boost set at?

12:1 AFRs are a little on the risky side for a stock ECU. Not worth it to me. I would tune it a little more conservative than 12.5:1. And definately not 14.5.

And with a stock ECU, you don't have timing control, which is an important part of a safe tune.

You might be able to do 12.5:1 and be ok but if that's the lowest AFR you're seeing and 14.5 is the highest under boost, you're asking for trouble.



http://www.supramania.com/forums/showpost.php?p=159348&postcount=2

[buldozr]

It all depends on the tune ;)



My stock twins used to run 12.5:1 on the dot, and it was awesome. It had a very good tune though.

:werd: Just a basic piggy back like emanage blue or emanage ultimate will yeild you timing control(not very expensive) Timing control is where its at, you can crank up the timing off boost and reduce the lag times significantly. :naughty: