Hey all, I will (or want to be) hopefully be getting the ball rolling in getting an oversized TB from Online Performance Autos (http://www.onautos.com.au/) for my TF. Now reading through old posts I have some questions...

1. Looking through past threads there is confusion for me around high flow versus oversized. Is there a difference really between them overall? I am still asking for an OSTB regardless, and will see what they say, but is there anything I really need to know?

2. What do I need to be cautious about in doing all of this? (if anything!)

3. Anyone who has had one installed, can you give me some feedback please and maybe some updated costs (including fitting). Also any performance figures/gains.

4. Should I kill two birds with one stone and get the FPR while I am at it (if possible), if so, please refer to questions 2, 3 and 4!

4. and finally SHOULD I DO IT? (thumbs up or down! be as brutally honest as you need to be, but not too brutal!)

This is all in the hope that I can actually get what I want!
An answer to any or all of these is welcome. I know this ground has been covered before but it doesn't hurt to refresh the topic.
A big thank you in advance :bowdown: Cheers Neil.

Sounds interesting, but I cannot find any magna parts on that website? although I just woke up, but I don't think that is the problem?

I am by no means a mechanic, but I would't bother with the fuel pressure regulator.

High flow and oversized is different. Oversized is potentially more useful if you have other mods like headers or cams to take advantage of it's ability to suck more air volume through. I too would be interested to see if they actually have an OS for a Magna. I'd doubt it but keep us posted.

The difference between the oversize and high-flowed designs from RPW is essentially that the high-flow version has fundamentally the same bore and retains the use of the factory butterfly but has a lot of the cruft ground out of it making it less restrictive.

An oversized unit has been bored out (in RPW's case: by 5mm over stock) and has the butterfly replaced. This one can flow much more air because of its larger diameter, but RPW had problems with the butterfly sticking open or something because the springs weren't up to the task.. and they couldn't get it to work on cruise control models.

I suppose I can comment on this one - as I had one of the RPW O/S 70mm T/B on my TH 3.5L. It was GREAT - at WOT it pulled soo much harder as it was getting ALOT more air in!!

However, there were issues with sticky throttles, the factory spring can't close the butterfly, therefore it can't work with CC.

But if the spend a little time thinking about it - I am sure they could upgrade the spring as well as the butterfly - and then it shoudl work better - I have a video of what my car sounded like while it is on a dyno - if i could get some one to host it i can upload it - but yeah - it had a real "lump" to it and i loved the sound it made!!

But don't forget - my T/B was in conjunction with headers / Pod / FPR / Greddy Emanage

but yeah - I TOTALLY recommend one if you are looking at upgrading!! but you don't need a big one - 70mm will be all you will need.

Manual

Thanks for those who replied... I was waiting for some feedback before submitting my query to them but will now go ahead. Any further info/advice is bery much welcome. Cheers, and I will keep you posted :D


Sounds interesting, but I cannot find any magna parts on that website? although I just woke up, but I don't think that is the problem?
I am by no means a mechanic, but I would't bother with the fuel pressure regulator.
Thanks Gone..., To be honest, I saw the letters RPW as soon as I opened the site and being out in the eastern suburbs I was eager to get on board with someone who was stating "We are the Victorian Distributor for RPW". Yes I have read some bad press, but if there is anyone out there supporting performance products for the Magna then they at least should have a chance and I hope to provide 'good press', they are also my first only obvious lead in possibly the right direction. Hoping that if they cant help, they might be able to direct me as to where to go (apart from to 'get stuffed! lol ).
Thanks for the feedback on the FPR. I thought if there was a change of flatenning out any flat spots it would be a bonus.


High flow and oversized is different. Oversized is potentially more useful if you have other mods like headers or cams to take advantage of it's ability to suck more air volume through. I too would be interested to see if they actually have an OS for a Magna. I'd doubt it but keep us posted.
Thanks for the info, I guess this too is explaining to me that this project might be more challenging than I was hoping for. teK suggested I go to an experienced fitter/turner and get the job done myself. Tempted but I will exhaust other avenues first.


The difference between the oversize and high-flowed designs from RPW is essentially that the high-flow version has fundamentally the same bore and retains the use of the factory butterfly but has a lot of the cruft ground out of it making it less restrictive.
An oversized unit has been bored out (in RPW's case: by 5mm over stock) and has the butterfly replaced. This one can flow much more air because of its larger diameter, but RPW had problems with the butterfly sticking open or something because the springs weren't up to the task.. and they couldn't get it to work on cruise control models.
Thanks for that clarification. I am actually tempted by the high flow if it reduces complications at the spring and butterfly as mentioned by yourself and Manual, but the attraction of the OS is still hard to get past. I don't want to take a happy engine and turn it into a nightmare as it has been totally reliable thus far.


I suppose I can comment on this one - as I had one of the RPW O/S 70mm T/B on my TH 3.5L. It was GREAT - at WOT it pulled soo much harder as it was getting ALOT more air in!!
However, there were issues with sticky throttles, the factory spring can't close the butterfly, therefore it can't work with CC....But don't forget - my T/B was in conjunction with headers / Pod / FPR / Greddy Emanage...
...but yeah - I TOTALLY recommend one if you are looking at upgrading!! but you don't need a big one - 70mm will be all you will need. Manual
Thanks Manual, you sound convincing that it is worth doing fueling my interest further. The complications as I said before I could do without though so will be doing my homework before going ahead with it. I have a few mods under my belt already and I was holding off on any ECU mods until late so as to not keep having to tweak it to suit.

G'day MagMag

I was skeptical about the throttle body too but went ahead with it and fitted it myself (the joys of being young and stupid and not having an idea what i was doing) Its a bit of a challenge trying to remove the accelerator cable - probably spent about an hour trying to do it/looking at it until i worked it out. From there is was easy. Im not a mechanic and used a 2-dolla shop socket set to do the job. Its just like Lego :)

The improvement noticable at the start. Other mods i got done in this order are Redback Exhaust, K&N panel(tried a POD but its too loud on the exhaust), FSE FPR, RPW high-flowed throttle body, extractors.
As my car is a manual, the responsiveness improved greatly at the start. However my old throttle body was full of oil and junk as a result of the POD Filter and was very sticky. So im not sure if just cleaning it would have made the same difference as put a new 'high-flowed' unit in. Comparing this mod dollar/gains wise to an exhaust/extractor upgrade the high-flowed throttle body is a thumbs down in my opinion. If youve done everything else, why not. The bonus about this mod is you dont really need to declare it for insurance purposes - it looks exactly the same in your engine bay.
A more noticable improvement is blocking the resonators that sit after the MAS Sensor. And thats free :)

hows it goin everyone ? anyways, i'v got an oversized throttle body on my 3L and would recommend getting one, purely for the increased responsiveness,

it made my car alot better to drive daily, and i think it gained a little bit of top-end aswell


so yeah, overall, definetly worth the money, especially if you are going to mod your magna further

later :cool:

G'day MagMag he he, magmag?



I was skeptical about the throttle body too but went ahead with it and fitted it myself (the joys of being young and stupid and not having an idea what i was doing) Its a bit of a challenge trying to remove the accelerator cable - probably spent about an hour trying to do it/looking at it until i worked it out. From there is was easy. Im not a mechanic and used a 2-dolla shop socket set to do the job. Its just like Lego :)
Jeeze you're game, impressive! I would like to get into it but for now I will leave it to the experts. Safer!



The improvement noticable at the start. Other mods i got done in this order are Redback Exhaust, K&N panel(tried a POD but its too loud on the exhaust), FSE FPR, RPW high-flowed throttle body, extractors.
I was wondering, if you increase the amount of air, wouldn't you need to increase the amount of fuel too? or does something compensate for it? I was wondering if the FPR would compensate somewhat for this or am I way off the track?



As my car is a manual, the responsiveness improved greatly at the start. However my old throttle body was full of oil and junk as a result of the POD Filter and was very sticky. So im not sure if just cleaning it would have made the same difference as put a new 'high-flowed' unit in. Comparing this mod dollar/gains wise to an exhaust/extractor upgrade the high-flowed throttle body is a thumbs down in my opinion. If youve done everything else, why not. The bonus about this mod is you dont really need to declare it for insurance purposes - it looks exactly the same in your engine bay.
he he, sounds good to me!



A more noticable improvement is blocking the resonators that sit after the MAS Sensor. And thats free :)
I am going to have to look into this now... cant say I have heard talk of this before but I would be out there tomorrow doing this change if I can work it out!

Thanks heaps for the feedback.

hows it goin everyone ? anyways, i'v got an oversized throttle body on my 3L and would recommend getting one, purely for the increased responsiveness, it made my car alot better to drive daily, and i think it gained a little bit of top-end aswell so yeah, overall, definetly worth the money, especially if you are going to mod your magna further later :cool:

Thanks heaps... I think I am sold on the idea. Appreciate the feedback. can you tell me how much it cost if you dont mind, parts and install...approx even. Cheers Neil

I have sent of the request form now, just waiting eagerly for a reply...

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hmmm when am I going to buy a new computer? keep spending most of my hard earned cash on the car! by the time I get my machine to schmick condition my PC wont work anymore thus I wont be able to show it off! catch 22

Well here is the response to my email... Now just have to put my money where my mouth is! Once again if anyone wants to put their twenty cents in, please go ahead.


Neil,
Thanks for your enquiry. The oversized throttle body for your Magna is $220
(+ $110 deposit - changeover - refunded when old unit is returned). I would
have to order it in which takes a week or so.

Borison at BT Autotech would be able to fit it for you and I can ring him
and get a price if you want.

If you have any other questions please contact me at any time,
Thanks

Trevor H
Online Performance Autos
www.onautos.com.au
sales@onautos.com.au

PH 03 9584 6431

Hey dude..

Given that Online Performance Autos are the RPW dealership and RPW aren't making the O/S throttle body any more chances are you're getting the high-flowed unit instead.. the price lines up too I think with the high flowed item. :doubt:

Hey dude..

Given that Online Performance Autos are the RPW dealership and RPW aren't making the O/S throttle body any more chances are you're getting the high-flowed unit instead.. the price lines up too I think with the high flowed item. :doubt:
Hey, Not that i doubt you but how do you know this? but thanks for the pre-warning though... I will be asking the question. To tell you the truth, I am not going to be too bothered if the high-flow is the only one they have available. obviously O/S is preferred. :D
Cheers Neil.

I've got a few questions about the OS Throttle Body.. I thought this place would be the best to get these answered!

1) The Oversized Throttle Body does not allow cruise control, correct?

2) The OS T/B gives greater throttle response?

3) How hard is it to install the OS unit?

Thanks in advance!

SuFz :rant:

Sufz, there is no O/S throttle body anymore. There was only about 3 made by RPW. They had sticking issues. The last one made was tried on the TT and a sticking throttle body on a turbo car is particularily bad so it went onto Manuals car.

I only want a Oversized Unit.. not a Hi-Flowed Unit!
Yes, I'm a picky mofo!

I'll only give up Cruise Control if its an OS unit.. :(

SuFz :rant:

Redav,cthulhu, I really didn't want to believe it was true but...

An email to Trevor...
Sorry, one more question... I have just been informed that RPW don't make oversized TB's anymore instead they have the high-flow ones, can you please confirm this?
Cheers again Neil.

The reply from Trevor
Yes I just checked with them and they are a hi flow version.

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Which now leaves me with the immediate option of going the high-flow after all that. I will press ahead and just have to lump it. Thanks for the warning!

i have one of those 3 oversized throttle bodies fitted on my car and i think its fantastic.
So manual had one, i have one, who has the last one?

I believe the third one was sold to a guy over east - who has just sold his magna as well - for memory - it was "UND13S" or BlackSports I think his username was - but yeah - I would hold off and wait for the fitting of these new twin T/B setups.

Manual

Cool so that means I could have a 1 in a kind 70mm O/S throttle body on these forums now!
Maybe I should put it up for an auction, i like the idea of having the only one of here though

Mitsiman,
Thank you for the information provided. It is a shame about the OS but I understand the point of not doing it if it is fraught with headaches. You have got me interested in the twin now dammit! :headbange though I am curious as to what the twin has to offer as far as gains are concerned and if there are other mechanical issues I may be facing once installed.

I have this money burning away in my pocket and I guess I might just have to wait now to see the developments (and no, I am not going to donate it to another worthy Magna! :hand: )

Thanks again and PLEASE keep us informed of the twin TB. Cheers Neil

In reply to Mitsiman's post..

Do they make an O/S Throttle body for the 3.5L V6 (163kW version) that allows for cruise.. or did none of the units allow Cruise Control..?

SuFz :rant:

Cool so that means I could have a 1 in a kind 70mm O/S throttle body on these forums now!
Don't get your hopes up :badgrin:


In reply to Mitsiman's post..

Do they make an O/S Throttle body for the 3.5L V6 (163kW version) that allows for cruise.. or did none of the units allow Cruise Control..?

SuFz :rant:
The throttle body use on the 6G74 and 6G72-S4's are essentially the same unit. Only slight variations in vaccum lines and cruise control. So his answer will be no.

You got it in one - no oversize unit was ever made for cruise control.

And the twin unit utilises a twin52mm or twin 58mm butterfly system and the way we are designing it there will be no mechanical issues and will work with the use of teh air flow meter and a greddy piggy back ecu with a FSE FPR unit.

And yes you willl need a rising rate FSE FPR because when you hit the accelerator this system is going to want some fuel to match the trebled air flow being fed into the manifold - and the stock accelerator pump settings will be set too low to avoid a flat spot (And these are non adjustable with any piggy back ecu system).

As said we are putting one together now with the aim of having it running on a car at the end of this monthon a magna.

Thanks again Mitsiman,
So I am thinking from what is being said here that this pretty decent sounding TwinTB could potentially be superior to the 70mm OSTB? :confused: :)

And that in order for it to function properly the rising rate FSE FPR is required (which I accept and understand) but assuming would be complimented by the Greddy? or would the Greddy be recommended also? I plan to get the Greddy down the track but if I really need it with the TwinTB I need to work out the total cost.

I may be getting ahead of myself but could you foresee the estimated cost of this new unit? And if there is any chance of getting any sneak peak photos posted, it would be much appreciated.

Cheers Neil. :thumbsup:

Thanks again Mitsiman,
So I am thinking from what is being said here that this pretty decent sounding TwinTB could potentially be superior to the 70mm OSTB? :confused: :)
It should, it should also allow a better feed to the rear two cylinders. Problem is, it will only be of better use if you've got decent breathing and exhaust mods. A cam and head upgrade should also bring the best from this swap.


I may be getting ahead of myself but could you foresee the estimated cost of this new unit? And if there is any chance of getting any sneak peak photos posted, it would be much appreciated.
It won't be cheap. I'm pretty sure it requires a new custom plenum. Can't wait for more details and pics.

Oh, I checked out the price on a throttle body from Japan on another Mitsu engine and it was NZ$1200 worth :shock:

Yes you will need a greddy or equiv to run the twin system in conjunction with the fpr unit...
...Won't be cheap and way superior to the o/s 70mm we use to use.

Cher Ching $$$ :shock: Well I am still keen to keep pressing on with this project though sounds like I need to do some more overtime!!! lol

So, I throw it out to the AM members again... (I know I could look but it doesn't hurt to ask).
1. How much to expect to pay for a Greddy?
2. How much to expect to pay for a RR FSE FPR?

Cheers.

I think there may be too many TLA's! lol