Jaguar AJ V6 3.0ltr (in S-Type 240Bhp Flavour) - Options

[AutoTaT]

Hello Folks,

I have been looking at S-type Jaguars with a view to buying a 3.0ltr petrol manual as an engine and gearbox donor for my old Reliant Scimitar (SE5).

I suspect that due to the complexities of the security system I will have to go for stand alone aftermarket management.

In standard tune they push out 240Bhp with little left by way of additional tuning options which I can understand as it's pretty tuned as is. However, for full retro effect in the Scimitar a set of throttle bodies would be great. The question is, would this give any performance gain or would I just loose all the mid-range and end up with a peaky screamer?

Does anyone have any thoughts/experiences?

Regards,

AutoTaT

[annodomini2]

Being DOHC vs the pushrod Cologne my first concern would be check it fits.

[AutoTaT]

Oh it will fit alright, perhaps a little fetling of the bulkhead but not enough to stop the conversion. The quad-cam Vauxhall V6 from the Omega has become a popular transplant and is of similar arrangement (albeit being a 55deg V as opposed to the usual 60deg) and the Cosworth V6 has also appeared in them in the past.

[anonymous-user]

It's not a "bad" engine, just a bit lame by the latest standards. In the Jag application, with it's worldwide emissions and noise certification, the exhaust is fairly restrictive, and a decent set of exhaust manifolds and low loss exhaust system should see quite a bit more power being available. Ultimate power is limited by what i would call a "low performance" intake port and valve design, but frankly, a genuine 300Nm/260bhp in your car would probably be plenty wouldn't it? Personally, for the sake of keeping costs low, i'd run with the std intake system, at least initially, as throttle bodies will only really help you at high rpm, which that engine isn't really designed to do.

[AutoTaT]

That was my suspicion.
The stock 240bhp will make a Scimitar entertaining after the 132bhp all iron Essex and the reduced weight will make a huge difference. It's good to hear that the exhaust is restrictive as it gives a bit of extra potential to claw back anything I loose from running the original management.