Porsche 928 Episode 124 - Tuning the Transmission

This week Im going to really fix my gear changing... honest.
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BACKGROUND : Welcome back guys to my Porsche 928 restoration! I bought the cheapest 928 in the UK and its going to be a battle to bring her back to life...
... and to make matter worse, Im not a mechanic! Im just a regular guy 'having a go', and it doesn't always work out!
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[@johnmcdermott5505]

I had an ‘82 with the 3spd auto as a daily driver for 10 years. If I floored the throttle and kept my foot to the floor it would hold a gear through to 6,000 rpm before changing up. However I found it more enjoyable to shift it like a tiptronic. Moving the shifter to 1st to start off it would hold 1st until I moved the shifter to 2nd.

[@MrToddgibbs]

Thats what Im aiming for. Manually changing all works fine, its just the early-shifting when in D. But 5k is almost there...

[@mcr1photo]

Good info

[@MrToddgibbs]

Thanks :)

[@Landshark928]

Nice episode Todd, sort of casino how far the rpm could go. You unleashed 25 extra horses between 4k rpm and 5k😊. Offtopic : is known why the cold start takes so many cranks? Our 928 had such an issue too and it turned out be a fullpressureregulator

[@MrToddgibbs]

I want those 25 :) I noticed while editing the video how differently it accelerates each time (I just plant my foot, nothing fancy). Sometimes it seems to really take its time, others it whips the needle round… Cold start. It always needs 2 turns of the key. Even if I crank it for ages on first key turn it won’t start (I’ll test that tomorrow just to be sure)

[@Landshark928]

@@MrToddgibbs hopefully soon you get the V8 run up to 6k🙏 to unleash the last 25 horses to come to the claimed 240hp🤗 good luck!

[@MrToddgibbs]

I'll keep working on it off-camera :)

[@MD-318]

Great progress this week. What an absolute nightmare of a problem!

[@MrToddgibbs]

Think I have it sussed now. Hoping to get into some juicy jobs soon…

[@Carmalarky]

Nicer, more appropriate sound with the silencers! With gear changes, do you think you’re getting full throttle travel when accelerating?

[@MrToddgibbs]

Agreed, exhaust is a little more refined. I’m going to modify the straight pipes a little …. Yes it’s getting full throttle. One time you can see it visibly accelerating slower, that’s because the Bowden cable is too tight and it’s stopping full throttle

[@grid212]

Great video, enjoyed watching the problem solving.

[@MrToddgibbs]

Thank you for watching :)

[@gazfish]

You seem to skip the part where you jammed the throttle peddle down and checked the cables, if the arm at the transmission is at its full travel there’s nothing left to give. If there’s still some play and no adjustment left you could put a knot in the cable under the hood.

[@MrToddgibbs]

Hey Gaz, yeah I filmed it but it’s hard to show under the car so I cut it. With pedal pushed fully down the cables are all tight…. I even over tightened it such that the throttle wouldn’t fully open. So I know it’s all adjusted ok now.

[@MrToddgibbs]

My piece of fuel pipe is similar to putting a knot :)

[@BradleyPieters-uw8ow]

I have done s similar adjustment process and come to the conclusion that the only way to get full rpm is to change the gears manually. Maybe thats how its supposed to be.

[@MrToddgibbs]

Hi Bradley - ah interesting! Yes manual change works fine. I might adjust it a bit more…. I’m sure I can get 5500rpm

[@BradleyPieters-uw8ow]

@@MrToddgibbs i adjusted mine until until it only changed gears when i release the throttle. Still didn't get the desired revs.

[@Morrisonspouch]

Nice work Todd

[@MrToddgibbs]

Thanks man, happy with that result.

[@Morrisonspouch]

Must remember it’s not a sports car, it’s a GT car!

[@MrToddgibbs]

True, but I still want it to rev :) quite frustrating when it changes at 4k

[@neildonaldsonlotusexcelresto]

Nice work Todd... If you put the gearbox in 1 or 2 (as opposed to drive) will it rev to the 6000 rpm redline when nailing it?

[@MrToddgibbs]

And beyond :) yes no issues with engine

[@Tumbling_Dice]

Change the modulator switch Todd.

[@MrToddgibbs]

Hey! Do you think that will help the gear change rpm? (Is it the think I adjust with the little key?)