David P

I've been too busy enjoying myself to make the vid-clip, yet full boost of 11lbs by 2.4k rpm.

C.W. explained that it corrodes there due to cavitation.

wojtrek, Thank you for being long posted, that's answered my sums conundrums. The transmission is controlled by Suprastick which is set to lock the torque-converter @ 2k revs. It was in Manualised Mode, maybe Dan changed up from third? torque-converter is set to slip for .2 second @ gear-changes. However, it's a bit slow and transmission functions are the next jobs on the priority list. I'll make a video clip of the rev counter and boost gauge. When the time comes, I'll drop the engine rev limit to 6,650rpm and see how it goes with a 3.6" pulley @ 12,500rpm. Thanks again for your input. Nastrovia

It'll be back on the dyno with a smaller pulley for 1 Bar of boost, as soon as I've completed development of other parts of the project. 1 Bar is the limit at which I would expect the engine, supercharger and transmission to function reliably. In the meantime, I'm curious to find the missing 150cfm. The dyno figures are related to the boost figure, but the volume is not related to the flow per rpm figures.

It's volume that's important, boost pressure is just a side-affect. The calcs I work out to be 747cfm and 150cfm = 100bhp, or thereabouts. If the throttle-body to charger induction pipe is causing circa 15% reduction to flow, that would cost a lot in generated heat to compensate for and take more power to drive it. Or I've got my sums wrong.

Boost gauge shows just over 11 lbs which is more than 4 less than calculated.

320 bhp is at the hubs, which is wheel hp minus tyre loss. The transmission was locked in 3rd (1-1) so the dip before 3k must have been Dans right foot. I will have a look and report on boost @ 1.5 - 2k. @ tick-over has no boost. The green line is the plot from my previous visit. Ginqueer! I used to be tenacious young whatsit. Cheers Thank you for the kind words, I'm "well chuffed". Now there are numbers, none of them make sense. According to my reckoning the charger should be pumping 747cfm, which on a good day should be enough for 500bhp. Crank pulley 6.78" - charger pulley 4.0" @ 112 cu in per rev x 6,800 rpm with correction for valve-overlap loss = 747cfm? I will measure the pulleys to double check, but if someone else could check my sums it would be informative.

Still going!

I'm pleased that it's now working properly and my gadgets have all survived the death or glory testing(s) with flying colours. The numbers don't tie up for me either, I had expected more torque than bhp, are the values same for both graphs? I'm curious to measure the crank and supercharger pulleys to confirm I'm using the correct figures to calculate supercharger rpm too.

15lbs boost is as far as I'd go with a stock N/A lump and as far as I'd go with the charger. Reduce supercharger pulley-size increasing boost +4lbs, better exhaust system, larger (75mm) t.b. maybe, re-time cams on dyno, add water/meth and HHO will all help in the numbers game. Watch this space. After the job list a post or two before.

Left at the gate and a brisk walk to the Pub to celebrate enough not to bother wondering why you've misquoted me.

With 11lbs that looks fine, there's more power to be had, but after more needed works have been completed and warmer weather arrives. I'm pleased to have evicted the final Gremlin, this part of the project is plain old nuts&bolts maintenance and improvements from here on.

CRACKED IT Dan couldn't fault it, so that must be "Official". Everything functioned perfectly. Zero belt-slip under any provocation(s) and it's boosting a steady 11lbs from before 3k rpm? Now the dog can see the rabbit, there's plenty of power for now and it's a pleasure to drive, even in the rain @ 5°C. After I've tinkered with the transmission and the control(s) of it, then sorted out the water/meth system and the HHO system. In the spring, I'll increase the boost a bit at a time up to 15psi. The Sky Hook Bracket proved sound and bhp still climbing @ 6,900rpm.

Have an email, the valve-body will arrive today, in the nick of lateness.

Remember to try an engine ECU swap before you hang it.

The new 4" supercharger pulley with shoulders and cross-hatching has arrived, now fitted and tested, ready for tomorrows twirl. Resolving belt-slip and discovering that boost is lower than expected, I'm tempted to use the 3.8" pulley for more psi, but curious to see what it'll do as it is. I'll save the 3.8" until after I've fitted the modified valve-body into the transmission and after winter has passed. The valve-body is now seven-weeks behind schedule and presently held-up at L.A. airport. The Gatorback belts are also overdue, not even a Robbing Tax Hoods ransom note yet. (Gates it will be then) I haven't yet upgraded the (chair-leg) hose-tails on the swirl-pot. (They'll survive a bit longer) The Water/meth system refit/upgrade is not completed. (Waiting delivery of final component)(and some better weather) Three wheels on my wagon and in need of an interim remap to keep the project rolling along.

That must be a contender for the Biggest Gayest Wing award?

Remap tomorrow.

Frost tested during final-fitting, the Sky Hook Bracket lives. To align the pulley I shimmed the idler bearing to be flush with face of supercharger pulley and with a 'special service tool' across the faces, clamped it where it needed to be, then shimmed between centre-fixing and supercharger bracket with a thin washer and nipped the bolts up where it sat. I'm test-driving the new set-up before destruction testing on the dyno. Currently running reliably with a shoulder-less supercharger-pulley and an unforgiving Gates belt, will change to new pulley and Gatorback belt as they arrive. It looks as though the previous configuration was not that far short, a little slippage yet could boost to 11.5 lbs. (charge-cooler on) With new belt-configuration there's no slip and it boosts-faster to 11.5 lbs. (charge-cooler on) Without the charge-cooler there would be around 1 lb more. I'd reckoned the boost would be around 15 psi with this pulley, maybe it's a sign of good gas flow and cool charge? Pressure or not, it'll be pumping 747cfm @ 6,800rpm. The new pulley didn't arrive today, so I've swapped tomorrow's remap to Friday, the Gatorbacks then get an extra day to turn up too? Driving home in the forecast blizzard will be enlightening?

Some pics of it under construction/development in my profile in 'Evolution' album.

Maybe there's a final winning number to reach yet.

Easy come, easy go.