Magna Throttle Body?

idawina · Post by **idawina** » Tue Jul 18, 2006 9:55 pm

Ive heard that a magna throttle body can be used as an upgrade for the FTO motor. Does anyone know which model magna that fits? does the stepper motor etc. need to be modded to fit the fto? worth the trouble?

Post by **Bennoz** » Tue Jul 18, 2006 10:05 pm

Suggest you do a search on Magna throttle bodies in this section... been down that road, waste of time. Best get your own one ported out

spetz · Post by **spetz** » Tue Jul 18, 2006 10:57 pm

I have to disagree with you bennoz.

I bought a Magna throttle body the other week and it is significantly larger than the original one.

However, unless you modify the plenum it wont give you any power increase. Maybe just more response.

Post by **Bennoz** » Tue Jul 18, 2006 11:07 pm

Which model do you get it off mate?

And what part is bigger, the opening of the inlet or is the bore a larger size? (Please tell me you got verniers onto it & not just sized up by eye!

)

I have one from a TS Magna and one from a TE & they are both identical to the FTO one - with the exception of the TS one, its back to front with the return spring & cooling linlet.

JayME · Post by **JayME** » Wed Jul 19, 2006 10:58 am

When you say Magna tb - are you meaning a throttle body of a 6g72 engine??

spetz · Post by **spetz** » Wed Jul 19, 2006 2:08 pm

6G72 or 6G74

And Bennoz, I got the verniers onto them and it is 65mm throughout the whole thing.

And, I never did a head to head comparison with the FTO unit as it is still on my car, but next to the RPW thermo gasket, it is significantly larger inside

Here is a pic of the gasket that came with the Magna TB, compared to the gasket from an FTO:

khunjeng · Post by **khunjeng** » Wed Jul 19, 2006 9:13 pm

hmm so it bolts on...does the hole line up properly when bolted on the manafold though?? how much is the one you got? (gasket + tb)

Post by **Bennoz** » Wed Jul 19, 2006 9:20 pm

Hmmm that is interesting... Looks like Im making another trip to the wreckers!

Will be a pain to bore the plenum to suit thou... cause its not a straight bore it will have to be offset ground to one side.

khunjeng · Post by **khunjeng** » Thu Jul 20, 2006 12:18 am

Bennoz wrote:Hmmm that is interesting... Looks like Im making another trip to the wreckers!

Will be a pain to bore the plenum to suit thou... cause its not a straight bore it will have to be offset ground to one side.

yeah thanks Ben for the correct words

I assume u need to bore...thats a pain in the arse by the looks of it. but it shuld bolt on

spetz · Post by **spetz** » Thu Jul 20, 2006 12:23 am

The RPW intake manifold package, they claim the end part of the plenum is cut and welded to flow more.
So have a look what you can do with that.
With ported intake runners, I assume this throttle body and the cutting/welding RPW charges $800 I think.

The throttle body from what I have been searching seems to be around the $150 mark, but I bought this one, with TPS, all electrics, cruise control stuff etc for $45

I haven't taken the stock throttle body off or anything, but just judging by the gaskets this should fit straight on, and I have seen them fitted to FTO engines before (in person)
But it is true some coolant lines need extending and stuff

khunjeng · Post by **khunjeng** » Thu Jul 20, 2006 12:26 am

stock is 60mm right...I assume u get a better throttle response with 65 but what sort of gain r u really gonna get...I guess more air in but for 1000 bucks how many Kws..

spetz · Post by **spetz** » Thu Jul 20, 2006 3:57 am

It's not really $1000, it's actually not near that

And as far as gains I am not sure, but I have done quite a few other engine mods so leaving the stock unit would be a restriction

And yes stock is 60mm, and I think a 65mm can flow significantly more (maybe around 15% more?)

JayME · Post by **JayME** » Thu Jul 20, 2006 11:55 am

Quite keen on doing this myself

Need to do more homework on the Plenum though - I take it no one on here has mucked around with this yet?? Whats going on in there??

Had ideas of of bigger throttle body and customising plenum with shorter runners but not too sure if this is a good idea or not

spetz · Post by **spetz** » Thu Jul 20, 2006 3:22 pm

I think shorter runners may be ok depending on what other work you have done.

There is a formula to check what length runners you need to where it will give torque to.
ie. peak torque in an FTO is 6000rpm, and the runners (I measured all this) are the right length for torque at 6000rpm.
But if you do other mods that will raise the peak torque rpm, you need to shorten the runners about 4.3cm per 1000rpm raise in peak torque.

What I am thinking of doing, is cutting off the plenum (my runners have already been match ported) and getting rid of the long/short butterfly system as I think this would be a restriction, and mine do not work anyway and I am happy with the low end power.
Now, with shorter runners, welding a bigger plenum with a bigger opening for the Magna TB which will be bored.

In general should have significantly higher flowing intake now over stock, which will enhance top end power more. But depending how many other mods the engine has I think this may be too much flow?