Guy Croft Lincoln UK 01522 705222

Guy… thanks for the link regarding the cam timing diagram and especially for the Excel file (which can be modified)! I am impressed. I have some more information for you. I have been in contact with ‘BoazG’ on this forum (the other Thema Turbo S3 owner with the similar 'soggy' bottom problem) and ca...

Guy; thanks for help so far and speedy reply. I have just found out the information I acquired for the S3 Thema cams both having a lift of ‘8.6mm’ were wrong, not by much and I don’t think it changes theory you have suggested so far, however for your reference here are the correct timings from an ac...

Guy; thanks for a superb answer and enjoyable read! I am sure so many others will benefit from this knowledge. You were correct with all of your assumptions! I will definitely do one step at a time as you suggest from now on until this problem is resolved. Regarding my ‘soggy’ bottom: I feel it must...

Hello… I’m a little stuck and would really appreciate some advice on my cam setup on this rather unusual twin cam! Here are the technicalities to aid your answer: The Thema S3 Turbo timing is: Inlet opens: 0 deg BTDC Inlet closes: 43 deg ABDC (223 duration) The exhaust cam is identical (43-0). The T...

SteveNZ; your image is great! Can you explain it a little better?

It sounds to me like your saying your exhaust cam was a tooth out, thats 16 degrees right? Was that advance or retard?

Hope to hear some answers soon!

Guy is it worth really advancing or retarding the tipo inlet cam then?

If so is advancing or retarding better for less turbo lag... and technically why is this?

Thanks so much.

Guy; I will be changing my cam setup to include the Tipo N/A inlet with standard turbo exhaust cam. I recall reading on another forum that advancing the Tipo cams 1 degree was the best setup, but also remember being told that retarding them 5 degrees would give much improved turbo spool and improve ...

From experience I had a similar problem, it was a faulty after market rising rate fuel pressure regulator... try turning down your fuel pressure... you may be suprised! If this is the problem buy a SARD regulator, they work perfectly! Apart from this my only one and last suggestion is to use Iridium...

Nabil, another very interesting post! Well I suppose you can minus your ECU from the equation, right? The only other suggestion I can think of is that your injectors may be at there maximum duty cycle and that an increase of fuel pressure may longer help provide the fuel needed for extra boost? What...

Nabil that¢ž¢s for sharing your experience with the cam setup in a 16v Turbo. Guy, what an explanation, I had to print it off and read it three to four times before it all sunk in, a very pleasurable and informative read! Thanks so much! So in layman¢ž¢s terms more overlap equates to more blow...

Hello Guy, 'Turbo spool' in my opinion would be the speed that the turbocharger is accelerated from exhaust gases to produce positive boost pressure. I found this on a Google search, not sure of the source: …œA side benefit of reducing overlap is going to be a smoother idle. Increasing blowdown t...

Interesting discussion... Just wondering what affect an n/a inlet cam on a 16v turbo will have on low down power and turbo boost pressure build up... I am concerned that the n/a steals power from the bottom to feed the top and that this results in slower turbo spool up. Can anyone confirm my suspici...

Where did you get your very nice looking manifold please?

That is very interesting Boaz.

I always wondered if it was a bad idea moving to the bigger inlet valves?

What power are you now making and do you have a R/R graph?

Guy: Does this shed any more light on design philosophy please?

Hi Guy.

I am sorry I do not have the S3 Thema Turbo manual for this information, perhaps someone else on this forum does?