CliveF just got quicker

[spitfire4v8]

I've had the pleasure of Clive's company for the last 2 days for some more mapping work on his Sagaris. Clive's done a very nice stainless airbox with the short airbox lengths that I'd proved on the 3.6 engines. The results are great on the 4 litre too!

Graphs :

std car as tested last year:


then Clive fitted some high lift cams and we ran it again but the low injector flow rates were causing us all sorts of problems:


then Clive returned with bigger injectors and a new short airbox:


As you can see the car is now genuinely over 400bhp so we're very happy with that. Smiles all round For those people who prefer wheel numbers it made 338 at the wheels. Very healthy!!

[haircutmike]

I know very little of the speed 6 engines but thought a standard 3.6 produced more then the standard graph shown.

The final graph shows how I thought the power would be produced, obviously far better then standard!

A very good result if just the injectors and airbox were changed.

[Alexdaredevilz]

100 hp per liter! Good job

[dpd3047]

Nice one Clive you must be chuffed with that, good work jools.

[scotty_d]

Very healthy figures indeed

[Ant.]

Nice one gents............

So now there is S6 400 club?

[natben]

Good figures, has this been achieved with a new cam, airbox and injectors, has anything else been done to the 4.0L.

[Podie]

Top work!

[clive f]

natben said:

Good figures, has this been achieved with a new cam, airbox and injectors, has anything else been done to the 4.0L.

Nothing done to the engine apart from the cams..
I have also ported the throttle bodies and thinned the spindles as shown on my thread sag remap in the s6 engine forum.

Can reply better when home struggling with fat fingers on phone at themoment.

[Geoff Ashcroft]

Very impressive results indeed Clive, with a damn good improvement with torque from 4500-6500

[Cooper Green]

I respect the op's and tuners exceptional credentials, and admit i know not of the tech aspect of engine power, but is a 66 bhp drop in power between engine and wheels really a good result ? And in that case what can we normal 3.6 and 4.0 speed six owners really expect from our standard units ?. What is a realistic at the wheel figure for a 4.0 s6, in good health but with no mods, which was originally quoted at 360 bhp from the factory ? I am begining to wonder if it is just the fact that these cars are so lightweight that gives the performance we experience.

Sorry if i may be a bit naive.

[clive f]

Joolz is probably better equiped to answer that one, its a question covered many times before with what people regard as a reasonable transmission loss, I think, general rule of thumb is 20%, the dyno works all of this out and shows the figures at the end of the run, it would take someone with dyno operator experience to explain it properly........I `ll just open another can of worms by getting it wrong

edited to add link to thread showing airbox etc.
http://www.pistonheads.com/gassing/topic.asp?h=0&a...

Edited by clive f on Sunday 8th July 08:32

[s5tvr]

Great work but it doesn't surprise me that some gains can be had by optimising the air flow through the air box as it seems to be the case from Dom's work that "breathing" might be a limiting factor with the SP6 as capacity increases.

Edited by s5tvr on Sunday 8th July 09:41

[RedSpike66]

Well Done Clive & Joolz

Can you feel the difference in driveability Clive ??? As the torque looks much better, coming in from about 3000 rpm rather than 4000 rpm and more of it too !!

What are the cams you've put in ??

[clive f]

hi mike, oh yes the pick up and acceleration is certainly better, the cams came from dave at www.rndengineering.co.uk

[s5tvr]

So a 27.6 bhp increase by fitting new injectors and the air box. Do you know what contribution each of these made to the increase ?

[clive f]

s5tvr said:

So a 27.6 bhp increase by fitting new injectors and the air box. Do you know what contribution each of these made to the increase ?

a few details here,

http://www.pistonheads.com/gassing/topic.asp?h=0&a...

[s5tvr]

clive f said:

a few details here,

http://www.pistonheads.com/gassing/topic.asp?h=0&a...

Missed that one - thanks

[spitfire4v8]

s5tvr said:

So a 27.6 bhp increase by fitting new injectors and the air box. Do you know what contribution each of these made to the increase ?

yes but the 377 is an artificial low to some extent because we couldnt control the fuelling there. If you see what I mean. With bigger injectors from the start that 377 would have been higher, but I dont know how much really as that wasn't tested directly. previous testing suggests the airbox on its own is about 10hp so the injectors were costing 16hp if you want to look at it that way around. the whole lot is definitely a package upgrade, ie you couldnt really do it without the injectors changed ..

[RedSpike66]

Jools, Fully understand the package thing, but just a couple of questions...

1. What do you think Clives throttle body mod does for the figures ? and
2. If I had ACTs c/f airbox, what difference/effect do you think the c/f trumpets would make ??

I'm more interested in lbs/ft between 3000 - 7000 rpm than headline bhp...

Thanks
Mike