Author Topic: Tuneup advice needed  (Read 602 times)

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Offline skinner36

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Tuneup advice needed
« on: December 26, 2017, 03:47:37 PM »
Hi,
I have a 289 in my '65 Mustang with Electronic ignition, full length extractors, Edelbrock 1405 0040 carburetor and an aftermarket inlet manifold. I couldn’t see any writing on the inlet manifold so I attached a picture.
 
I am afraid that that is about as much as I know about the engine.
 
I only get 12 mpg out of the car which I wouldn’t mind as long as I got what seems like 12 mpg worth of performance.

My question is can anyone recommend a tuneup place in the Eastern Suburbs of Melbourne, around the Ringwood area?

Would a dyno tune be better than a “normal” tune?

Edit: This is an A code car

Thanks for any advice

Online Clubman7

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Re: Tuneup advice needed
« Reply #1 on: December 26, 2017, 05:07:17 PM »
600cfm carb is a bit big for a stock 289.
Have you had any work done to the engine?
I have a 500cfm Edelbrock on my 289 and get about 20mpg on rural roads

Offline barnett468

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Re: Tuneup advice needed
« Reply #2 on: December 26, 2017, 05:55:48 PM »
.
1. ok, you need to recurve your distributor and properly set your vacuum advance. Good luck finding anyone whom can actually do that properly.

2. That carb is decent once it is PROPERLY tuned. Good luck with that also. I would throw it in the nearest trash can or give it to someone I hate immensely.

3. Do a compression test.

4. What is your tire size and rear gear ratio?


Online GEOFF289

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Re: Tuneup advice needed
« Reply #3 on: December 26, 2017, 06:45:52 PM »
John, I have no direct experience but have heard good things about this place in Wantirna not so far from you.

https://www.facebook.com/pages/The-Carby-Shop/642330942480810

If you don't know much about the engine a compression check as suggested would be a good idea. If the efficiency of the engine is escaping past worn out rings or valves or both it'll both use more juice and be no ball of fire and you might want to pause before spending money on tuning or new parts. I know my tired old 289 was way more thirsty than the new roller cam 5.0 I have in it now despite the new one having way more mumbo. I have a compression gauge if you want to borrow it.

There's a number of basic checks and adjustments you can do on the carb and timing to see if there's any no or low cost tuning opportunities that might improve things a bit.


Offline skinner36

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Re: Tuneup advice needed
« Reply #4 on: December 27, 2017, 10:20:35 AM »
.
1. ok, you need to recurve your distributor and properly set your vacuum advance. Good luck finding anyone whom can actually do that properly.

2. That carb is decent once it is PROPERLY tuned. Good luck with that also. I would throw it in the nearest trash can or give it to someone I hate immensely.

3. Do a compression test.

4. What is your tire size and rear gear ratio?

The tyres I have on the back are Cooper Cobra Radial G/T P225/70R14

I jacked the rear end up and put the transmission neutral, marked the driveshaft and the right hand rear wheel. Turning the wheel once turned the driveshaft 1.5 times. According to things I have read this does not seem right though.

I haven't got a compression testing tool yet

I had the distributor rebuilt a short time ago.

Offline scollist

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Re: Tuneup advice needed
« Reply #5 on: December 27, 2017, 10:27:34 AM »
The tyres I have on the back are Cooper Cobra Radial G/T P225/70R14

I jacked the rear end up and put the transmission neutral, marked the driveshaft and the right hand rear wheel. Turning the wheel once turned the driveshaft 1.5 times. According to things I have read this does not seem right though.


If you have an open diff (not an LSD) you will only get half of the ratio if you only turn one wheel. So it is likely you have a 3.00 diff. Get someone to turn the other wheel at the same time (so you are turning both rear wheels simultaneously) and you will get a proper reading.

Offline skinner36

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Re: Tuneup advice needed
« Reply #6 on: December 27, 2017, 10:36:57 AM »
If you have an open diff (not an LSD) you will only get half of the ratio if you only turn one wheel. So it is likely you have a 3.00 diff. Get someone to turn the other wheel at the same time (so you are turning both rear wheels simultaneously) and you will get a proper reading.
Will do

Offline skinner36

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Re: Tuneup advice needed
« Reply #7 on: December 27, 2017, 10:54:21 AM »
I checked the diff again turning both wheels and the ratio seems to be just a smidgen under 3 turns to 1 so I would say it is 3.00

Offline skinner36

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Re: Tuneup advice needed
« Reply #8 on: December 27, 2017, 10:58:12 AM »
Do you think that this compression tester would do the job?
http://www.supercheapauto.com.au/Product/ToolPro-Cylinder-Compression-Tester/12556

Online BAC

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Re: Tuneup advice needed
« Reply #9 on: December 27, 2017, 11:09:59 AM »
Cheers,
Brian

Online GEOFF289

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Re: Tuneup advice needed
« Reply #10 on: December 27, 2017, 11:18:21 AM »
Do you think that this compression tester would do the job?
http://www.supercheapauto.com.au/Product/ToolPro-Cylinder-Compression-Tester/12556

Looks like the same one I have. They don't show the packaging in that photo but mine is a Stanley rather than Toolpro, but looks identical and the description is verbatim from the packaging mine is in. It works fine. Biggest hassle is getting it screwed in to some of the plug holes in these narrow cars.

Offline barnett468

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Re: Tuneup advice needed
« Reply #11 on: December 27, 2017, 01:02:47 PM »
I checked the diff again turning both wheels and the ratio seems to be just a smidgen under 3 turns to 1 so I would say it is 3.00

It's probably 2.75 - 2.80, 3.00 is fairly rare.

Changing the gear ratio will make it accelerate quicker but run higher revs per each kph.

3.25 and 3.43 are common mild performance upgraqdes.

Offline skinner36

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Re: Tuneup advice needed
« Reply #12 on: December 27, 2017, 02:15:06 PM »
OK. I thought 3.0 as my door plate says 3.0

Offline barnett468

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Re: Tuneup advice needed
« Reply #13 on: December 27, 2017, 02:27:50 PM »
OK. I thought 3.0 as my door plate says 3.0

should be 3.0 then but you said it did not make 3 full revolutions.

 

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