Home | Register | Login | Contact Us

 
Auto Math
Classifieds
Forum
Gallery
Games
Garage
Tech Articles
Utilites
 
FAQFAQ    SearchSearch    RegisterRegister    Log inLog in    Log in to check your private messagesLog in to check your private messages    Forum Subscriptions1/4 Mile Table 

Challenge for all the gear heads, The quest for gas mileage
Goto page Previous  1, 2
 
Post new topic   Reply to topic    SMOKEmUP.com Forum Index -> Chevy - Big Block
View previous topic :: View next topic  
Author Message
10sec.et
Member


Joined: 29 Mar 2006
Posts: 3473
Location: Houston,Texas
346658.74 points


1969 Oldsmobile Cutlass

PostPosted: Sat Mar 16, 2013 10:13 am    Post subject: Reply with quote

clay wrote:
I believe Transgo has a kit that will allow you to run a 4L80E full manual. found this for the valve body... http://www.makcotransmissionparts.com/T34173E.html


I don't know what temp thermostat you have but run it hot as possible. Do you have the intake exhaust crossover blocked? If so I would open it up to heat up and vaporize the fuel as much as possible. Also do you still have the factory heated air system on the air cleaner? Clay



added a link to your post Wink

interesting approach to getting the fuel vaporized. he will definitely need that EGR to keep the cylinder temps down and out of detonation. my concern with that is the intake cooking the fuel in the Qjet. speaking of Qjets, i just thought about those well plugs that tend to leak over time. something to check. that will certainly kill your economy.

_________________
af2 wrote:
It seems we can look at our magical Balls and come up with a fix?

Back to top
View user's profile Send private message
Knarley Darley
Member


Joined: 22 Apr 2004
Posts: 1247

540238.26 points



PostPosted: Sat Mar 16, 2013 10:36 am    Post subject: Reply with quote

It does still have the stove and pipe pre heating the air cleaner snorkel, the stock intake is open to the exhaust under the manifold, the carb has been rebuilt, and the well plug has been JB welded. I have had good luck with improved fuel mileage switching to MSD, but they have always been points distributors previously. Since this one already has a factory HEI there may not be any gain. It seems like the MSD would help because the rpm is always low enough to be in the multi spark mode.
Back to top
View user's profile Send private message
Paul P
Member


Joined: 15 Aug 2002
Posts: 2404
Location: Townsend, Mass.
81616.60 points


1971 Chevrolet Chevelle

PostPosted: Sat Mar 16, 2013 1:17 pm    Post subject: Reply with quote

SMOKEmUP wrote:
Everything Paul said is a great start. However not sure I buy leaving the tail gate up.

Get a wideband O2 sensor with datalogger. Use this to determine the air fuel ratio and where the engine spends most of its time. Then try to optimize the BSFC for those rpms. Or possibly change gears to get the engine where the BSFC is optimum.


Mythbusters proved it was better up. Here is a link that says the same thing since Mythbusters was blocked on You Tube.

http://www.youtube.com/watch?v=xocaC15WwA0

UP forms bubble air flows over bubble....

Off was also ok but I was only talking about up/down.

Other items i did not put on the list.

11. Electric fans
12. Electric water pump if you dare...
13. Underdrive pulleys
14. Serpentine belt system will be more efficient

Paul.

_________________
2001 Focus 2.0 Zetec
stock cams, bolt-ons and tune
15.63@87 MPH 1/4mi

1971 - Chevelle 408 SBC N/A
6.86@102.5 MPH 1/8mi
10.78@122 MPH 1/4mi
Back to top
View user's profile Send private message
Knarley Darley
Member


Joined: 22 Apr 2004
Posts: 1247

540238.26 points



PostPosted: Sun Mar 17, 2013 1:19 pm    Post subject: Reply with quote

Good ones. I didn't think of electric fans. That would help a lot. I have a twin fan and shroud setup from a 2000 camaro. I wonder if that would be enough to keep it cool. It does have a big radiator. The fan on the truck has a very aggressive clutch on it that sounds like a 747 most of the time.
Back to top
View user's profile Send private message
clay
Moderator


Joined: 24 Nov 2002
Posts: 3209
Location: South Carolina
318129.23 points


1972 Chevrolet Nova

PostPosted: Sun Mar 17, 2013 3:07 pm    Post subject: Reply with quote

I was pretty sure it did have a clutch fan and there wouldn't be much room for improvement but if you're hearing the fan, I definately think an electric fan would help. The fan clutch locked up on my S-10 years ago and it was a definate drop in economy before I replaced it. Never checked how much though. If the Camaro fan doesn't work you could always go the old standby fan - Ford Thunderbird or Crown Vic. I don't think it gets much more impressive than them. Clay
_________________
I have done so much with so little for so long, I can now do anything with nothing.
Back to top
View user's profile Send private message
squeeezer
Member


Joined: 02 Mar 2007
Posts: 2427
Location: new richmond WI
191524.76 points


1991 Chevrolet Camaro

PostPosted: Sun Mar 17, 2013 3:12 pm    Post subject: Reply with quote

Yup advance can raise compression overdrive trans and adjust timing accordingly
Now you have 13 mpg.....elec fan.....13.15 mpg

_________________
Back to top
View user's profile Send private message
af2
Member


Joined: 01 Sep 2003
Posts: 5558
Location: grassvalley, ca
71227.76 points


1933 Willys Coupe

PostPosted: Sun Mar 17, 2013 5:49 pm    Post subject: Reply with quote

squeeezer wrote:
Yup advance can raise compression overdrive trans and adjust timing accordingly
Now you have 13 mpg.....elec fan.....13.15 mpg


And leave the EGR in your case.

I had the same deal on a 77 4WD 400 in 1982 or so that I swapped in a REED cam with a SP2P intake. The thing would ping like crazy. Re installed the EGR and it was nice getting 15 around town after I put in the part time kit on the full time 203 transfer case..
Back to top
View user's profile Send private message
squeeezer
Member


Joined: 02 Mar 2007
Posts: 2427
Location: new richmond WI
191524.76 points


1991 Chevrolet Camaro

PostPosted: Sun Mar 17, 2013 10:10 pm    Post subject: Reply with quote

Transplant 8.1 and trans,computer
_________________
Back to top
View user's profile Send private message
Paul P
Member


Joined: 15 Aug 2002
Posts: 2404
Location: Townsend, Mass.
81616.60 points


1971 Chevrolet Chevelle

PostPosted: Tue Mar 19, 2013 1:36 pm    Post subject: Reply with quote

squeeezer wrote:
Transplant 8.1 and trans,computer


Laughing Rolling Eyes

_________________
2001 Focus 2.0 Zetec
stock cams, bolt-ons and tune
15.63@87 MPH 1/4mi

1971 - Chevelle 408 SBC N/A
6.86@102.5 MPH 1/8mi
10.78@122 MPH 1/4mi
Back to top
View user's profile Send private message
Knarley Darley
Member


Joined: 22 Apr 2004
Posts: 1247

540238.26 points



PostPosted: Wed Mar 20, 2013 4:34 pm    Post subject: Reply with quote

Well that was interesting. Yesterday I had to travel to the next city for my tax appointment, and on the way home I ran out of gas on the freeway. Luckily I was able to coast (barely) off the nearest offramp, and call my brother who brought me gas. So my first test is a bit squid. I did learn that it runs out before the gauge is on Empty!
Back to top
View user's profile Send private message
10sec.et
Member


Joined: 29 Mar 2006
Posts: 3473
Location: Houston,Texas
346658.74 points


1969 Oldsmobile Cutlass

PostPosted: Sat Mar 23, 2013 11:52 pm    Post subject: Reply with quote

make sure you buy fuel from the same station, same pump and average several trips. DOT checks the pumps here to verify they are pumping the ammount of fuel they say they are. i have, on more than one occassion, purchased more fuel than what actually went into the tank. i dont care who you are, you cant put 25 gallons in a 22 gallon tank. if youre not paying attention, and only do 10 gallons, it will screw up your mileage calculations.
_________________
af2 wrote:
It seems we can look at our magical Balls and come up with a fix?

Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    SMOKEmUP.com Forum Index -> Chevy - Big Block All times are GMT - 5 Hours
Goto page Previous  1, 2
Page 2 of 2

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
Home | Contact Us | Automath | Cam Files | Dyno Search | Forum | Garage | Picture Gallery | Reaction Timer

Copyright 1997-2016 SMOKEmUP.com All rights reserved.
Advertising Info     Disclaimer     Privacy Policy