Modifying tip needed

hough

Road Burner
Points
67
Location
Poole, England
Car
VW T5 swb 2.5tdi
Hi iv got a 1999 BMW E46 328i touring i have got a induction filter and a new exhaust system waiting to be fitted, but what other mods can i do to this engine and do mods like alu pullies help????
 

obi_waynne

Administrator
Staff member
Moderator
Points
1,137
Location
Deal, Kent UK
Car
A3 1.4 TFSI 150 COD
I think underdrive pulleys and lightweight pulleys are over rated, they make some difference but not much of one for the hassle they are to fit.

The best mods for a car engine are as follows.

Internal work yields the biggest gains, head work like porting polishing and 3 angle valve jobs will maximise the airflow and raise the power.

If you want to go to the max then cryo treat the block, get it rebored and look into blueprinting and balancing as well.

Bigger valves are an obvious addon but not all engines are suitable as it depends how close together the OEM valves are.

A fast road cam will yield good power gains, especially in the top end of the rev range. Don't go mad though a profile of up to 270 degrees will give the best gains without the engine becoming cammy.

The most popular power mods are induction kits (which are questionable as power mods but they can sound nice if that is your sort of thing) and sports exhausts with sports catalysts or decats.

To keep the car legal I'd recommend a sports catalyst rather than a decat.
The last mod should always be a remap as this will allow you to fully realise the power gains on offer from your mods.

It's worth having a read of the articles on www.torquecars.com/tuning/ for more information on these mods and what the terms mean.
 

pikey motorsports

Track Warrior
Points
172
Location
hampshire
Car
None! 04 GSXR 600
Ally pulleys are definitely worthwhile, but only if you have had the engine blueprinted and head worked as per waynnes previous post. a lighter perfectly balanced engine is far more efficient, hence less power wasted getting things going!

A vernier pully on an uprated cam is a must to be able to take full advantage of timing advance etc.
 

hough

Road Burner
Points
67
Location
Poole, England
Car
VW T5 swb 2.5tdi
thanks guys will look into the above tuning tips, and wanye that exhaust box is nearly finished but have been taking pictures so when complete will post the project so other can see..... then next im going to look at making my own headers
 

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