RotorMotorDriver

iTrader: (1)

Well, I finally managed to control myself with the Weber (keep my foot out of it ), and pulled of an amazing 14 MPG with it the other night. Im expecting about the same with this fill up. It honestly almost like the more mods I do, the better gas mileage I get. With my stock 85 GSL, I was getting 9 MPG. Then, I went to the 83 with RB exhaust and got better mileage. Now, Im getting the best mileage ever with the exhaust and Weber. Maybe its just because they are more efficient? Oh well, Im not really complaining .

Anyway, here are two things I did that I think helped:

1. Stiffer throttle return spring. This helped with my problem of subconciously relaxing my foot on the highway and giving it progressivly more and more gas. I would then I let off to slow down, and do it all over again. Besides, I wanted a better spring, and this one just feels better .

2. Re-Installed the cruise control. Im sure this helped too, as I dont even have to have my foot on the gas now . This was actually really simple to do. I just used an extra opening in my throttle cable bracket I made, put the cable in with the main throttle cable on the carb linkage, used a spare port on the manifold for the vacuum signal, and everything else is the same as stock.

Heres a quick run down on the throttle cable bracket.

Originally when I made it, I planned on using the top hole that the cruise control now uses. When I tried it however, it was clear that the hole wasnt low enough to fully open the throttle on the carb. So, I just put the throttle cable lower in one of the other holes. I had planned on cutting the top off to make it look better, but now Im glad I didnt . I got to thinking that the cruise control is never even gonna have the throttle more than 1/2 of the way open anyway (probably not even 1/4), so the top hole would be perfect for the cable because the fact that you cant get WOT from there wouldnt matter. So, I put it in, and then realized I needed a source for the vacuum signal. Well, luckily there was a 1/8" NPT port in the manifold that I had just plugged because it wasnt used by anything, and I just happened to have a 1/8" NPT to 1/8" barbed hose adapter fitting laying around from a previous OMP injection idea. So, I popped that fitting in there, ran the hose to it, plugged it all in, hooked it up, and took it for a spin, and it worked just fine.

The only things I want to do to the setup are:

1. Figure out a way to shorten the cable. You can see in the pictures that its too long and it has to "loop around" the throttle cable linkage.

2. Get two nuts for the cable to be held in place with like the throttle cable. As you can see, I needed a way to keep the cable aligned with the hole, so I used a zip tie to hold it parallel with the throttle cable. Without this zip tie, it would go in at an angle, and cause the idle to come up. The other zip tie is on the cable itself. This one was needed to keep the cable from coming out of the bracket when the throttle was moved with the pedal and not with the cruise control servo.

3. Repaint all the pieces. Im in the process of cleaning and detailing my engine bay (its a long process, give me a break), so I want everything in there to be the best looking it can .

Anyway, I know this is rambling on, so Im just gonna shut it down here.

~T.J.

PS - Pictures are at:
http://www.angelfire.com/space/rotor...ber/index.html

thorin

heh.. sweet. I wanna get a webber, and since my 85 gsl gets 14mpg bone stock... Ill be getting better mileage than a geo by the time i'm done modding! :p

timmya2

wats a webber and how much is it

RotorMotorDriver

iTrader: (1)

A Weber is a carburetor. Look at the picture in the bottom right of my signature, or look at the pictures at the link I posted above.

~T.J.

SoRRoW

Ok the 4 lines on your intake what are they,
2 bronzed OMP lines
1 Big brake booster line,
and whats the other.

Can you take me a close up pic of yoru OMP I need to redo my lines and want to see how you have it set up,I want to go with copper or aluminum lines.

RotorMotorDriver

iTrader: (1)

2 copper OMP lines
1 brake booster
1 cruise control line (just added)

As for the picture, yeah, I can try and get you one if I remember. All I did was use crush fittings for the copper tube on the manifold end, and then used two little sections of 1/8" rubber fuel line on the OMP end. One end of the small piece slides onto the OMP, and the other end slides over the copper tube. Just like the stock setup with the rubber tube at the end of the plastic lines, only with metal OMP lines instead of plastic ones.

~T.J.

SoRRoW

Post it when you can,Im tring to order a nipple from RacingBeat so I can run a oil line into my carb to the fuel bowl sites,I got a friend who said hes done it,and bought it from them,and they said they dont sell a nipple for that.

PaulFitzwarryne

timmya2- like you I would like to know what a Webber is. Could be a cheap Chinese copy of a well known carb. i notice that the new california made Weber IDA48 is nearly US$1000.

RotorMotorDriver- your consumption figures are alarming. the original figures were 16mpg city and 23mpg highway. On average you should acheive about 20mpg. On long trips I normall get 28mpg cruising at 70mph. Your original set-up must have been seriously off-tune

680RWHP12A

quote;
On long trips I normall get 28mpg cruising at 70mph. Your original set-up must have been seriously off-tune.


are you sure about that? my stock automatic 85 is tuned and it gets horrible mileage! 8-10 mpg!

pillage6

I thought I was the only one getting less than perfect mileage.

Maybe it's my lead foot and large turbo

jutny

i get about 130 miles to the tank, which is right around 10mpg... and it sucks.... i was hoping for at least 15 or so

allthough, i doubt my **** is tuned right, and i think my tank may be leaking.

question: since i'm using a dellorto (no fuel return line) should i cap the line on the firewall, or leave it open to vent?

680RWHP12A

cap the return line! i bet your loosing gas from there! i know from personal experience! your gas ank has a vent in it already..

Drifter101

Thanks man, im going to try that for sure!

Rx7carl

Sorry to burst your bubble but my stock 85 GSL auto gets 20mpg solid (city milage). It has 110psi compression, burns a little oil and still gets decent milage. My old GS 5 spd used to get 22 city and 27 hiway mpg. You all have a heavy right foot I suspect.

jutny

that might explain the VERY strong gas smell that the car emits on a more than half full tank... hmmm.

good call Robert

-Kurt

DriveFast7

iTrader: (1)

On long freeway trips I also got 28mpg with my dellorto, 39mm chokes, 12a streetport.

Somethings really wrong if you get under 10mpg.

jutny

well, i went and plugged up that return line with a bolt and a hose clamp... we'll see about mileage and smell in a few days i suppose.

i knew something had to be wrong... cause it's not running THAT rich, it's a little rich, but to consume fuel at the same rate as my rich running Chevelle with a motor exactly 6 times the size is ridiculous... that thing got 10mpg around town... ****

82streetracer

iTrader: (1)

I used to get great gas milage on my old 12 like 30 mpg.

all I had was a streetport exhaust sytem, edelbrock filter and a electric fan.

But it was running lean as ****.

PaulFitzwarryne

680rwhp12A- I am certain I get 28mpg.

One of my regular trips is about 750 miles one way.
I fill up with standard fuel drive 150 miles freeway at 75mph+ then 200 miles of 2 lane rural at 65-70, followed by 100 miles of rural highway at 75mph. The road is relatively flat and I only have to slow down for one town.


I then stop to refuel at 452 miles, driven nonstop with great West Indian music

The measured consumption is 27.95mpg with the 16.6 gal tank. I visit 3 rural hospitals where I have to drive the 450 miles as start of my various trips. The tax authorities make me keep very accurate figures!

The car is a 1985 12a, stock ported, modified Nikki with K&N filter, a RB style header and exhaust, 14" Dunlop w10 tires, deleted airpump and AC. The rwhp is 121-126 when dynoed. Its an Australian specification engine with the larger stock ports giving an extra 15hp to the USspec!

680RWHP12A

well im glad to hear you guys are getting such good mileage out of your first gens! i havent done a comp. check on my car and it recently failed the smog check(the car is so low i think the cats got damaged!)so i think thats where the problem is! is there anybody who has a automatic car for me to compare mine to? i know the tranny robs me of gas mileage for sure!you have to floor it everywhere you go!

timmya2

i got automatic ..


im from australia so i use the metric system.. kilometres

i dont know how to calculate it.. but i get really YUCKY MILAGE

half a tank will only last me a week..

and i dont even travel that far.. probably 14 X 2 KMS everyday

my car smells gasy all the time..maybe im losing fuel? wat could it be guys

pls help

thanx

PaulFitzwarryne

What gives poor consumption

an automatic car
driving in traffic
short trips
heavy right foot to get performance
crawling round the Rocks

Check your consumption by filling up the tank, zero the distance, drive till the tank is nearly empty, fill up again and check the distance travelled. Work out how many litres you used per 100km. That is the Australian fuel consumption practice used by NRMA. When doing the test carry a can of spare fuel in case you run out as guages are usually inaccurate.

Around Sydney with an automatic I would say 15 l per 100 km should make you happy, 18 would be realisic and 25 a horror requiring major tuning. But what you said sounds more like the consumption of a heavy loaded semi-trailer!

Your tank capacity is around 55 litresfor a s1-2, 65 for a s3.

bliffle

I get 20-22 on the 83GS and 12-14 on the 85GSL. Both idle well and run good, except the 85 still has a stumble at 4000. I have a new Bonerz cat and muffler to go on the 85. I plan to put headers on both cars when I get done working on the two houses I have to fixup.

B

timmya2

heavy semi trailer??

so how can i fix this

Defprun

Woah dude. Mine got great gas mileage with auto. Especially in stop-go traffic for some reason.