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MG MGF Technical - surprise

My garage exchanged my plastic throttle housing for an aluminium Trophy one today, and when I collected my car this afternoon I was surprised by the effect of this relatively simple operation. I accelarated like I normally do, but to my surprise the car almost jumped away. Either my throttle must have been in a bad way, or the slightly larger air valve (48-52mm) has a larger impact than I thought. Does anyone of you have the same experience?
Kryn Saman

Yep, the larger diameter has a very nice effect :o)

Many Elise drivers have made the swap for just that reason (someone did a before/after rolling road test and the difference was something like 6bhp IIRC)
Dot

Kryn,

Nice to see things worked out!
cheers,
David.

Oh yes...I experience the same feeling. Unfortunately, after a while, you get used to it. Hence other mods are needed to keep the grin
david

Hi,

welcome to the engine breather club :)
Though, just purchasing the part is boring, you know what I mean *grin*

BTW, if you know anyone in B or NL who wants such a D- made LHD big bonnet box, I've now got one for sale. (175 EUR fixed price, new).
:)

Cheers
Dieter
Dieter K.

i have a 2001 mpi, with alloy throttle body but it's only 48 mm ...
does the trophy one will have the same impact on my car ???
Benjamin

It's the size that matters,
so yes!
Hanah Kim

ok , what can i expect with a kn 57i kit fitted +big throttle body??? how many hp???
Benjamin

I've fitted both to my 99MPi, and I would guess around 12 HP. The car responds a lot faster. The TTB will make the K&N louder.

regards,

Alex
Alexander

where can i buy the TTB??? only in GB???
Benjamin

By post from Mike Satur or Brown & Gammons?
JohnP

Benjamin,

Try www.mikesatur.co.uk

I prefer buying from Mike as he helps out with a lot of stuff, and B&G seems to make money out of delivery costs. So try Mike he will be the man for ya.

Regards,
Hanah
Hanah Kim

ok , thanks a lot...
i know mike satur ,it seems to be serious..
is it an easy DIY job (k&n+TTB+rover 820 airbox???)
Benjamin

So let's see,

MPI
K&N + 8BHP (+ 15BHP VVC)
Exhaust + 4BHP
TB + 6BHP

Total +18BHP MPI
Total +25BHP VVC

Naaaah!


Tony Escort Driver

Or to put in another way, is an MPI with exhaust, filter and throttle body as quick as a TF135 (+- a couple of HP). Probably, I reckon. However, the 135 does have those high lift cams....

Darren



Darren

Can this modification be done to the TF135 - or has the breathing been improved in this engine?

TIA
Dick Morbey
Richard Morbey

Simple answer - no, it's already been done!
There aren't any real proven methods of improving HP on a 135 as the breathing's much improved over the F anyway, well not without getting the head off or doing silly things with multiple throttle bodies. However, I'd speculate that a good qualify cold air box (ITG etc) or an exhaust would improve bhp/torque marginally. As usual, speak to a specialist such as Mike if you're in need of more power!

Darren
Darren

Kryn,

to ask a real Dutch question: how much does it cost to have the throttle housing replaced by a trophy one. And -maybe this should have been my first question - what exactly is a "throttle housing" (what's the Dutch word)?

Robbert.
Robbert

Expect 130, and its the whole piece that fits between the airfilter and the inlet manifold (where the throttle cable goes)

Will
Will Munns

Or talk to Dieter and ask how much for an adapted Opel throttle body (much cheaper, but a little more work).
Tony Escort Driver

Robbert

<<<And -maybe this should have been my first question - what exactly is a "throttle housing" (what's the Dutch word)?>>>

If you mean a throttlebody, translated in Dutch it is a 'Gasklep'. I paid around 200 euro to had it replaced.

regards,

Alex
Alexander

Dieter,

I am interested in the bonnet box. Send me an Email OK?

SF
Scarlet Fever

This thread was discussed between 25/09/2002 and 27/09/2002

MG MGF Technical index

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