Mini tubbing 66 coupe

[zlat347ci]

Can anyone reccomend someone they have used for tubs in melbourne, good quality job?

Cheers

[barnett468]

Can anyone reccomend someone they have used for tubs in melbourne, good quality job?

Cheers

You could call Mustangs of Melbourne and see if they know anyone.

[GEOFF289]

Zlat, go here

https://www.facebook.com/John-Taverna-Chassis-272507992899290/

[skinner36]

These guys also get involved in drag racing. Maybe they could help

http://www.eastcoastmustangcamaro.com.au/

Cheers,

John

[zlat347ci]

Thanks guys, Have spoken to John Taverna real good bloke and great knowledge.

[coops]

That's a bit spooky.

[GEOFF289]

If it was the late John Taverna senior he spoke to it would indeed be spooky.

Fortunately John Taverna junior grew up in the family engineering business and continues to produce very high quality work from his second generation knowledge base.

[zlat347ci]

haha i just assumed he was John himself, regardless he knew his stuff!

Now to decide 4 Link or calvert cal-tracs and mono leaf. 

[GLENN 70]

Do not go a 4 link ,not good for street driving . Cal tracs and mono leaf all the way .

[boofhead]

A mini tub does not need a change in rear but if you want to - go 3 link with watts link and coil overs.

[zlat347ci]

Ill look into that thanks.

Whats the widest MT street e.t people have used in a 65 66 untubbed? Ive been playing with a 255 50 16 and just seems impossible.is flush with outside lip and also inner tub towards front.
Unfortunately 235 is the next size down in a 15, am i wasting my time with that tire size with 500hp+ for 1/4 mile

[GLENN 70]

A 235/60x15 ET street will do the job no problems .  It's your suspension that will be letting it down .  Try this next time at the track ,run 18 psi rear ,40 psi front , undo the front sway bar ,and see how it hooks up .  I have mates running in the 9s on 235s .  Cal tracs and the mono leaf  is the next step and will make a huge difference on the track .

[zlat347ci]

Thanks Glen appreciate the reply.

Do you know what backspacing and size rim they are running? 15x8 4" b/s?

[PET-289]

Mini tubbing and moving the springs to the inside of the rails you will fit 295x50x15 or 10.5x28 slick

[GLENN 70]

My back space is no good for you because mine has a 69 diff fitted .  With a 235 ET you can run a 7 inch rim and that will allow the side wall to flex .  ..  PET-289 the 29 inch is a bit of over kill  with only a 500 HP flywheel engine and I think with the right tyre pressures and cal tracs and mono leaf rear end he won't have a problem . I get no wheel spin at the track with std suspension ,sway bar off and 235 ET s ,and 1.6 sixty footers ?   Sure only 430 HP tho . You can fit softer front springs if you want and some 90/10 shocks . If you do the cal tracs you need to up grade the rear shocks also . I think they may use a 50/50 .

[PET-289]

Glenn, if he is going to mini tub the car, it would be better to do it properly the first time.
Can i ask what effect removing the front sway bar does..(curious) as i've never heard of that before.
With approx 520HP and 28 x 10.5's my oil burner went 11.0 and 1.4 sixty foot
I have 10" wheels and 5" b/s

[GLENN 70]

Different story if he's going to tub or mini tub the car ,then yes run the biggest wheel and tyre combo he can . Going up to a 29 inch tyre will depend on his gear ratio . I think tubbing the car is wrecking it unless it a show or drag car . Remember it's a 500 HP engine not blown or turbo forced . I don't know what diff ratio or converter size he is using . Taking the sway bar off or disconnect it allows the front to come up for weight transfer . If you use 90/10 shocks you don't have to do this if you run a std sway bar . 1.4 in the 60 foot is great but it needs traction and good HP and the right set up all round . Most good street cars set up  well on ET streets run 1.5 s ,but big HP cars will run lower . Those  electric cars , Tesla , run 1.5 all day on normal street tyres total factory specs and 10.6 in the 1/4 mile at 124 mph . One has run a 10.4 

[zlat347ci]

Wow thats insane with the Tesla cars, we transport them at work didnt realise they are that quick!

Rear end is 4.11 gears with 4200 converter.

In the intrested of cleaning it all up i was swaying towards a 4 link as opposed to caltracs and mono leaf which my engine builder swears by

[GLENN 70]

I just got off the phone to 69 ish talking about your car lol. Which one did your engine builder like ? . A 4 link does work better on the track but is not Good for street driving . Don't go picking on electric cars unless you want to be blown away .  4200 converter and 4.11 diff gears hmm be carefull you don't run out of revs with 26 inch tall tyres over the line . You may need 3.9 or 3.7 gears or taller tyres . What do you rev it too?

[boofhead]

OK so drag racing - which gear - my assumptions based on 4200 converter
1) converter should flash 1500 revs below peak torque
2) thus peak torque is 5500 rpm
3) hence peak HP around 6800 rpm
4) Hence you shift at 7300 rpm
5) Crossing the line at 7000 rpm in top gear at 118 MPH
6) assuming 26 inch tyre equals

      rear ratio should be 4:56:1  for 1:1 gear box gear.

[GLENN 70]

7300 rpm sounds great but what does he rev his 347 too ?  He should be close to 120 mph maybe . With a 500 plus HP engine and weight should be around 3100 lbs with driver but could be a bit lighter as I don't know the car . 120 mph should be around 6,400 plus converter slip ,6,800 rpm over the line ,but I don't know his rev limit ? . It depends how tight his converter is also for slip in top gear .

[zlat347ci]

I rev the motor to 6800 converter is very tight.

Peak tq on dyno was at 5100 (460ft)

Engine builder is more in favour for the caltrac setup said the 4 link was a waste for what i was going to use the car for.

[GLENN 70]

Ok at this stage your set up is pretty spot on with the 4.11 ratio but only just . I don't know what mph you will cross the line ,but around 118-121 mph  and around 6700-6800 rpm .  The suspension set up I said will work even with 235 tyres if you do the whole package . Mini tubbing is up to you and yes then you can fit a 10 inch rim and  a 255/60 or even a 275/50 depending how big you go in the tubs . How far do you want to go with your car is the question . PET-289  will tell you how to set it up as a more of a track car and I can also .  120 mph with 4.11 ratio 4200 converter = 6,400 rpm plus converter slip over the line top gear .

[Coupe66]

Hi guys.
Just thought I would share my stats from my recent trip to the drags. My car is 3100pounds with me included, has the new 347 engine with 3500rpm stall and 3.9 diff gears. I run the 235 et street radials at 18 psi.  I changed gears at 6500rpm and crossed the line at 6400rpm. The car had no traction problems but a slow 60ft time of 1.7 sec. and a 1/4 time of 11.7 @ 117 mph.
I was happy with how it went, although a bit quicker off the line would be nice.
Interesting to see if the front sway bar trick may make a difference?
Mine did get a slight axel hop on a couple of the runs which concerned me a little.
I think like Glenn said with 500hp and 235 tyres, with the right suspension, traction will not be a problem for zlat347.
Cheers.

[GLENN 70]

Coupe66 ,taking off your front sway bar won't help if you have traction and may increase your times as the engine is wasting HP trying to lift the front instead of propelling the car forward .  This only helps if you have traction problems and you don't . You do not want ANY axle hop none ,1st it's unloading the tyres which increase wheel spin . 2nd it can cause tail shaft problems . 3rd  can break axles .  You need tramp rods or cal tracs to stop it . The cheap way is tramp rods ,easy to buy or make and the bar  to go up to the spring pivot point with about 25 mm gap . I'm quite sure you could google about traction bar set ups for leaf spring cars . Even the early shelby bars will work . Without trap rods your rear springs will bend ,called spring wrap and change the diff piñon angle causing less traction and your  tail shaft could even fall out .