I keep hearing guys talk about their 20 MPG (and that neighborhood) in cars very similar to mine and I just don't get it. I get 10 MPG IF I'M LUCKY!!! Is there any way to squezze better mileage from a 350 with a Holley 750? My gears are 3.25's (or so I was told) and I have a 700R4 tranny. Am I just doomed to filling up every 3 days? (If answering, keep in mind that I don't want to sacrifice too much performance, it's pretty damn scary for a daily driver.)

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"If you ever drop your keys into a river of molten lava, let'em go, because, man, they're gone." - Jack Handey

 

hmm... new air filter, new sparkplugs, new distrib. cap, new wires, new o2 sensor... Those could help.

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89 iroc-z 305 tbi
k&n filtercharger, open element air filter. nuffin' else

 

Doh.. That's a carb isn't it.. Do you even have an o2 sensor? hehe

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89 iroc-z 305 tbi
k&n filtercharger, open element air filter. nuffin' else

 

Yea its called EFI

Sorry for not having a worthwhile reply.

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1987 IROC-Z L98,SuperRam,EB 6085's,LPE 219/219 Roller, Crane 1.6RR, EB TPI Base, 58mm TB, ADS 24#, AFPR, K&N, EB TES, Catco Cat, 3" Borla Cat-Back, Accel cap,rotor,distro/other crap, MSD 6AL, MSD Blaster 3, Aluminum DS, 94 Disk Rear, Adjustable Valve, Precision 3.73 Gears, Sub-Frame Connectors, Hotchkis Lower Control Arms, KYB Shocks/Struts, Suspension Techniques Lowering Springs, Polyurethan Bushings all over the place, Moog Upper/Lower Ball joints and Tie Rods ends/Idler Arm,

To see the ROC, Check out the webpage Here

 

Have you tuned the carb or is it "out of the box" ?

If out of the box, lean it up some. Out of the box my edelbrock carb ran WAYYY too rich.

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Two 1984 Trans Ams and some other stuff
Order of the Cacti: www.lotusforum.net/

 

I get 24mpg on the highway with my 383.



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*I do custom performance mods on Edlebrock Performer carburetors (dualplane intake mods in the works),
White 1986 Irocz, 305 with iron #416 heads,
383 with aluminum TFS heads,
Edlebrock Performer-RPM intake and Performer #1407 carburetor, +110hp shot of crack, 700R-4 tranny, Vigilante 2400 lockup converter, 3.25:1 Ford 9" rear, Mcreary Road-Stars, SLP-stainless 1.75" shortie headers & Y-pipe, single 3" Borla exhaust, Linginfelter-TPI camshaft part number 74216 pulls 17" vacuum solid. Cam specs 213/219 @.050 114-LSA, sometimes advertised at 216/219 @.050 112-LSA .462/.470 lift @1.5:1 ratio. Using Harland Sharp 1.65:1 roller rockers. MSD-6AL, billet distributor, multi-retard, blaster-3 coil, and RPM switch. SouthSide machine subframe connectors, SSM lift-bars, Moroso 4" underdrive crank pulley.

N/A runs 10.9 @124,
Crack-runs 10.3 @135
haven't run at track since Oct-99
* vizit miy homepayge * http://www.geocities.com/trailerparkpage/

 

It's out of the box (about 2 months ago). I know it's running rich, but it idles at 600 in park and I don't know enough about carb tuning to do it myself w/o a little help. I'm afraid that if I cut off any more fuel, it won't run at all. Anyone have any tips on tuning a Holley 750?

 

Everything under the hood is new, including the engine. And no, I don't have an O2 sensor on my carb.

 

YEAH!!!! SEE WHAT I MEAN?!?!?! How are you doing that?!?!?! And why are you rubbing my nose in it without giving my any constructive advice?!?!?!

 

Go to the carb board and ask how to tune a Holley. I only have experience with the Carter style carbs. It will help your mileage immensely.

 

YOU CAN GO 3 DAYS BETWEEN FILLUPS? consider yourself lucky. really, i get about 8mpg on average. its the cost of power... well maybee its the 750 dbl pumper. by the way, i run 110 octane fuel at $3.99 a gallon.
hows evansville? havent been there in a while. theres a really hot chick that works at Dennys by the airport, i see her every time i go there
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85 IROC 350 11:1keith blacks,.555lift erson roller cam,1.5 crane roller rockers,edelbrock intake,holley 4150 750dbl pumper, nitrous oxide,full length heddman headers,true dual exhaust, 11"stall converter, 700R4, 3.73 locker

[This message has been edited by bottledpower (edited March 30, 2001).]

 

110 octane? What kind of compression ratio are you running? If it's not sky high, either you don't need 110 octane, or it's not 110 octane, and they are just playing on words since everyone assumes higer octane=higher power, when really all it means is flash temprature i.e. at what temp will it ignite. Due to the universal gas laws, a higher compression engines compression will heat the gas to a higher temp and could cause detonation/dieseling.
(Just to clarify)

As for MPG I get SH*T 3.73 gears (after destroying 2 sets of 4.10's) And the other mods, and I get 10-12. Driving from Denton Tx to Fort Wort costs me about 3/8 of a tank both ways (This is also at between 70-80 MPH running at 2500-3500 RPM the whole way)


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Corry Lazarowitz
clazarow@voicenet.com
clazarowitz@hotmail.com
SLP 1 3/4" headers, 3" cat back (stock cat )MSD ignition. MSD Blaster SS coil. More soon when funds are avail...

 

OK, so I get a chance of slamming someone for a change.....

Just kiddin'

A NOS powered car, even if running a lower compression, must use more octane to get out of the ballpark of 'ping'...which could completely obliterate the motor if enough juice is squeezed with cheap gas with a higher risk on cheap pistons, too tight ring seal, no extra oiling hole..........

Nitrous.... the whole different animal!

 

85firechicken,

tell me some more about your engine setup like cam specs, exhaust, ignition etc.. maybe I can figure what is going wrong if it is not just your carb leaking or way out of tune. Most people just allow their carbs to get dirty over time which ends up clogging the airbleeds for the idle & transition slot, or even the main well. Clogged airbleeds will definately cause a severe rich condition.

 

To all: Thanks for your replies, it turns out that a new neighbor of mine came over to check out my car after hearing me in the driveway attempting to tune it... Long story short, he's a holley-tuning machine and now my T/A runs like a raped ape. knowledgeable neighbors rule! Again, thanks for the help.

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"If you ever drop your keys into a river of molten lava, let'em go, because, man, they're gone." - Jack Handey