DODGE SUPERVISTA

So you're actually getting 55 at the wheels. 89 ft/lbs is pretty good, and with a fairly linear spread over 2000rpm

4650583641_dba2503b41_o.jpg

"You,re only supposed to blow the bloody SLIDING doors off"
Founder of the 6 speed club
 
Where did you take it Jim?

I sorted my garage into 4 piles of stuff.
1. Stuff I`m keeping
2. Stuff I`m not getting rid of.
3. Stuff I might use..one day.
4. Stuff that might come in handy.
 
55 bhp...uggghhh ;)

Was a place called Autotronix...if you look at the top of the picture with the graph, all the details are there.

The Blue Toaster
commercrop_zps68ea08d6.jpg
 
Just be glad it's not an original engine, that would barely push 40 :I
Also remember that Rootes figures are on an ENGINE dyno - power at the FLYWHEEL. A rolling road is more realistic as it accounts for transmission and frictional losses and the result is what you actually get at the wheels :)
What is does show is a struggle to breathe over 3500rpm, which is a cam issue.
For a comparison my J4 saw 98@wheels ;)

4650583641_dba2503b41_o.jpg

"You,re only supposed to blow the bloody SLIDING doors off"
Founder of the 6 speed club
 
'What is does show is a struggle to breathe over 3500rpm, which is a cam issue'

...that's exactly what I thought Tim!!!??? ;)

So that's when it drops off significantly on the lighter shaded line - is that the torque then and does that show breathing issues?

cheers

Jim

The Blue Toaster
commercrop_zps68ea08d6.jpg
 
Yes, the lighter line is the torque curve, which is read off the lbs/ft scale on the right. The BHP is the dark line read off the left hand scale. The torque is what is important, not the BHP, as it's what accelerates you and pulls the van up hills. Your peak torque is about 3500rpm and you're only about 7 lbs/ft down at 4500rpm, so it's not a sudden drop, but the way it tails off says the engine is struggling for air as the revs get higher. Torque is totally a product of airflow and brake mean effective pressure (BMEP). It's a case of pressure/time/volume in the cylinder. The more you can get in and the harder and quicker you squeeze it, the more torque you get :)

4650583641_dba2503b41_o.jpg

"You,re only supposed to blow the bloody SLIDING doors off"
Founder of the 6 speed club
 
To get max acceleration you would have to work out the RPM drop for each gear ratio, rev it past and get it to drop bang on 3500 when you change gear, so you get max torque ;)
Should be easy with 6 Nick :D

4650583641_dba2503b41_o.jpg

"You,re only supposed to blow the bloody SLIDING doors off"
Founder of the 6 speed club
 
Need to get a rev counter with a shift light[}:)]

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Founder of the Non-Facebook Club
 
Would be interesting to know what revs I'm doing at 55, probably a lot! Any idea what extra speed id get going from a 5.12 to a 4.77 diff? I guess about 5mph

The Blue Toaster
commercrop_zps68ea08d6.jpg
 
You can calculate it, but 5-10 will be about right.


4650583641_dba2503b41_o.jpg

"You,re only supposed to blow the bloody SLIDING doors off"
Founder of the 6 speed club
 
Thanks Stephen, just arrived in Portsmouth in the dark so will look tomorrow. Found an empty spot of land behind a boat yard only us and the harbour next door, proper lovely. Sailing 7am tomorrow. Van been great not missed a beat fuel econ looks alright but not worked anything out yet, Tim what's the capacity btw, never asked. Been cruising about 60 most the way with a stop off in Oxford and a bite to eat at Jamie Oliver's Italian...its nice, bit pricy, posh pub food really.

The Blue Toaster
commercrop_zps68ea08d6.jpg
 
They are slightly smaller than yours Panky. I made some adjustments to give a bit more fitting tolerance. I don't actually know the exact capacity now :I

4650583641_dba2503b41_o.jpg

"You,re only supposed to blow the bloody SLIDING doors off"
Founder of the 6 speed club
 
Well so far so good, made it round Normandy ok and running lovely. Been to the landing beaches today, proper moving stuff and still a few Tanks and stuff around from the d day weekend.

Ok tyres, they are 15" 185c 103 102p running through a 5.12 diff and on an overdrive box, so what you think that would on a 4.77? Runs so well up hills but an extra few revs would help the motorway. The soundproofing is doing its job though can have a good conversation at 55 :)

Cheers

The Blue Toaster
commercrop_zps68ea08d6.jpg
 
The following speeds are calculated at 3250 rpm, for your tyre size.

Have used the Overdrive ratio that I have in my Triumph, which has a J type, of 0.797:1 as my Commer workshop manual doesn't detail the overdrive or it's ratio. Let me know if not right and will make corrections.

The 3rd diff ratio of 4.55 is for the Humber diff that Miss Piggy gave me.

Diff ratios 5.12 4.77 4.55

Gear Gear Ratio Speed in MPH
1st gear 4.105:1 13 14 15
2nd gear 2.331:1 24 25 27
3rd gear 1.516:1 36 39 41
3rd O/D 1.208:1 46 49 51
4th gear 1.000:1 55 59 62
4th O/D 0.797:1 69 74 78

Cheers Stephen
 
The 'J' type fitted to Rootes cars is the same, 'D' type is .803:1

41fa30c8-22ce-43e8-bd12-188475a80292.jpg

Founder of the Non-Facebook Club
 
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