I havent dynoed so not sure of hp. I run a mikuni hsr carb so a bit different to the norm. I had been running 7-9 psi for 10 yrs with no issue. Have only been running high boost 103mm pulley for approx 6 mths but all seems fine so far, good reliability. Pulls pretty well and does 14sec qtr mile but quite drivable. Open diff helps the torque steer. Doesn't help the wheelspin though!


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1310 SC 1969 Morris Deluxe - 15psi boost
1293 1968 Morris Deluxe Miglia - 45 Weber
HSV Maloo Z Series - Comp Cam - 300rwkw
Ford DF LTD - 5Ltr

Thanks for the info. Sounds like a nice setup. I busted a gearbox layshaft bearing which is why I'm now a little cautious. I use the Quaif ATB and love it!

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Build thread for Supercharged 1275 1967 Deluxe Resto
Build thread for Mini ute conversion 998cc Turbo

Ok, no worries. Layshaft bearing busted sounds ugly. I havn't seen that happen before.
No gearbox issues here so far, touch wood (rod change 3.44 diff on 12 x 5.5 wheels).
My stock head and cam + 15psi may equate to a similar output to your 9psi with high flow and charge cooling.
Do you have a 1/4 mile time at all? I use the Drag Racer app.

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1310 SC 1969 Morris Deluxe - 15psi boost
1293 1968 Morris Deluxe Miglia - 45 Weber
HSV Maloo Z Series - Comp Cam - 300rwkw
Ford DF LTD - 5Ltr

Yeah needed engine and gearbox rebuild. Back in the road last weekend. I had 2.9 diff but during rebuild switched it to 3.2. Rod change. On 10s

3.44 plus open diff would in some ways be better, for durability. I had 2.9 diff with ATB diff, plus super sticky tires A032Rs. Asking a lot of the box. Whereas if open diff and spinning wheel, the wheel would slip before too much strain is on box.

Not sure on 1/4 mile times...will have to check, maybe I'll do that at some stage

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Build thread for Supercharged 1275 1967 Deluxe Resto
Build thread for Mini ute conversion 998cc Turbo

True, tall diff, LSD and the Yoki slicks would load up the box.
The poverty pack 3.44 open with wheel spin - the ultimate in durability. I have blown a few 3.44 diffs in my day though, not with this car, but I used to have a 1275 LS as a young fella and unfortunately it experienced many 2nd gear burnouts with the handbrake on.
Usually the gears smashed through the diff housing and didn't pollute the oil pre shut down.
Heads up on the 1/4 mile app, I got up to about 95mph so you need a special place to do it.

Sorry mrberry, I don't mean to hijack your thread. Hope you don't mind the added discussion, should be relevant to your build though.

cheers
Rick

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1310 SC 1969 Morris Deluxe - 15psi boost
1293 1968 Morris Deluxe Miglia - 45 Weber
HSV Maloo Z Series - Comp Cam - 300rwkw
Ford DF LTD - 5Ltr

Not a problem Rick