Pelican Parts Forums - 73T - Bob Watson Rolling Road

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73T - Bob Watson Rolling Road - Base Run

I had planned for some time to get the 911 over to Bob, as I had read good reviews here, and knew that Tuthills took their cars there as well.

So, with the sun shining, I took the pleasant cross country route from Stratford over to Middle Aston.

Bob is a really nice chap, willing to explain and spend time as required.

I explained to him that I wanted a baseline run, so that I could check the overall condition of the engine, and gain advise on any tuning etc. that may be required at a separate session.

Whilst James (Hot66) posted of his 198bhp from his 'S', I am happy to post a healthy 140bhp baseline from my 'T'.

http://i124.photobucket.com/albums/p...1/DSCF0782.jpg

http://i124.photobucket.com/albums/p...1/DSCF0786.jpg

The picture of the computer screen is in Kw and Nm, so in old money, Bob converted that to :-

140 bhp @ 5830rpm
134 ft/lb @ 4380.

There is a nice flat torque curve (can you have a flat curve Smile ), that he suggested would make for a good rally car.

The following observations were found, and I will return for a tune up and an updated post in due course.

- the 10bhp over stock is really down to the SSI Heat Exchangers
- speedo reading 60mph at a true 53mph (later electronic version ?)
- tacho reading 4,600rpm at a true 4,000rpm (cannot work that one out)
- idle jets too rich so using more fuel that needed.
- a general tune up will see 150bhp - roll on the next visit.

Finally, there is a short video of the dyno run here :-

http://uk.youtube.com/watch?v=6HRcg3c0WUc

Ian

"would make for a good rally car"

Yes, that's a great idea. :)

Quote:

Originally Posted by Highfield (Post 3406466)

Yes, absolutely. Extremely knowledgable and helpful.

Ha! Right underneath your leftmost bumper overrider in that first photo, you can see the scorch my wastegate pipe left when I went in June to check my AFR's. Freaked me out at the time - looked around because I realised the room was filling with smoke, and noticed almost the entire exhaust system casting a bright orange-yellow glow from under the car...

Bob was just amused - probably at my agitation, I think..

Nice looking longhood you have there.