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MG MGF Technical - Twin flex down pipe: RR result

REsults from hi-flow: the setup includes spaghetti exhaust manifold and twin flexi downpipe. All for 1200 OZ $ and 160 OZ $ transport. Ive heard some negative comments about this system. But I cant help believing in it: might be next mod before changing to gas flowed or S.C.

At Wheels
Final run
Baseline K&N ST. III
bhp bhp bhp
3000 55.7 57.0 60.3
3500 63.4 67.0 70.4
4000 70.1 74.2 79.1
4500 79.8 82.9 90.5
5000 85.8 91.2 100.6
5500 89.6 92.3 105.9
6000 87.2 89.9 111.0
6500 82.5 84.5 107.4

Test 1
1998 MGF 1800cc,Standard 10.5 : 1 comp.
non standard exhaust - twin outlet ms. Muffler

Test 2
Standard paper element replaced with
K&N panel element in standard housing

Test 3
1998 MGF 1800 cc, 10.5 : 1 comp.Hi-Flow K&N Induction
& stainless Hi-Flow muffler, Hi-Flow 4 - 2 -1 headers.
Wolf 3D Engine Management Unit fitted
Modified cylinder head ported to suit new headers and
quad throttle body installation
Custom Cam


David, do you also have torque figures, as getting 4-2-1 would boost up the torque more than the bhp I thought.

I also thought of getting the exhaust manifold redone, but ran out of fund + they said will take 3 weeks to make it and I will be carless for 2 days.

Hanah Kim

Thatīs all they gave me Hanah. A pitty they donīt have any BHP or torque figures of the 4-2-1 fitted to an unmodified cylinderhead. I am tempted though.

That 20 horsepower is a huge gain though!
But quad throttle bodies = expensive + wolf 3D etc etc, probably cost close to 3000 pounds I am assuming...??

Hanah Kim

Interesting figures David - but as you say, who honestly knows what contribution - if any - the manifold is providing to that highly modified engine.
Rob Bell

Torque is 'power' multiplied by 5252 and the result divided by the rpm.

In this respect the true effect of performance gains will be seen in the torque gains and where they occur. Here the first spec has a torque peak at 3000rpm, the second spec 3% higher at 3500rpm and the third well modified spec produced 8% more peak but the same figure is seen at 3500, 4500 and 5000rpm. A very flat delivery and by 5000rpm is 16% and 10.5% up on the other specs. This shows the engine will pull stronger from lower rpm and continues long after the other specs see a sharp drop in torque.

Roger Parker

This thread was discussed between 23/02/2003 and 24/02/2003

MG MGF Technical index

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