Larger Throttle Bodies

ruchi · Post by **ruchi** » Tue Aug 03, 2004 11:48 am

Beme007 wrote:I dont see why a Performance Part Company dont give a dyno result to back up their product.

I agree, it's a bit like a car stereo manufacturer not publishing the specifications of their products. Would you fork out $$$$ for new ICE without knowing what the specs were?

ruchi · Post by **ruchi** » Wed Aug 04, 2004 11:25 pm

just had a thought...

you'd probably get a better response by spending your money on a CAI over a bored out throttle body, as it will increase the density of the air going to the engine having the effect of a massively bored out TB.

fto12345 · Post by **fto12345** » Fri Aug 06, 2004 12:25 pm

Hi guys,

Could, who ever posted this, give us a quote as to how much it'll cost to have this done?

Cause I am getting my clutch replaced at the moment, and my mechanic told me that he could do this, and I think he mentioned that it'll be about $300~$400.

I'll ask again when I pick up the car this afternoon, but is that a good price?

I don't really doubt this guy cause he does a fantastic job and quite cheap too...
He is replacing my clutch for around about $330.
And he is replacing these bolts that are loose, and getting the fly wheel machined and everything.

But let me know what you guys think...

Thanks,

ruchi · Post by **ruchi** » Fri Aug 06, 2004 12:58 pm

Are you sure you REALLY want to get your flywheel machined? What is it you're hoping to do and are you aware of the effects and risks?

HRD2BQT · Post by **HRD2BQT** » Fri Aug 06, 2004 5:56 pm

Machining the flywheel is basically lightening the unit...
by shaving off a little bit of metal to reduce weight will result to a faster reving engine response....quicker acceleration but be prepared to sacrifce uphill driveability of the car - not much though that u wont even notice if u dont often drive on this kind of road.
its better done while changing clutch - saves u $$$ of labour if u do it separately....

Leigh · Post by **Leigh** » Fri Aug 06, 2004 6:00 pm

I think he means it "machined" as in re-smoothing the surface, rather then reducing the weight.

HRD2BQT · Post by **HRD2BQT** » Fri Aug 06, 2004 6:22 pm

Leigh wrote:I think he means it "machined" as in re-smoothing the surface, rather then reducing the weight.

Dude,
why would u wanna smoothened the surface of the flywheel?? you wont get any gain out of it. NO POINT DOING THIS!

Lightening the flywheel whill give pros & cons as I mentioned earlier. For me - thats what he meant by machining!!!

RallyMad · Post by **RallyMad** » Fri Aug 06, 2004 8:00 pm

I thought it was pretty common practice to machine the flywheel to make a perfect fit when repalcing the clutch and to start again with a clean surface, not to mention removing any small damage that might be on the flywheel.

fto12345 · Post by **fto12345** » Sun Aug 08, 2004 6:21 pm

ok ok ok...
Sorry guys for not being so specific about this...

When I was getting my clutch replaced, the guy said he needs to have the flywheel machined, because it will have a lot of uneven surfaces.

Any manual car, when you are replacing the clutch, they will most likely have to machine your flywheel to get an even surface for the clutch, otherwise, it will not fit with your new clutch properly and the contact surface will be uneven, which in the long run will eventually ruin your new clutch!

That's what I meant!

Now, for the other question I had!
How much is it to have the throttle body machined and have the new butterfly valve fitted?

Thanks,

GWIDO · Post by **GWIDO** » Mon Aug 09, 2004 11:36 am

if you dont get the flywheel machined the clutch will shudder when you engage it. Lightening will be of litle benefit unless you get a lot taken off, which means its replace time when you do the next clutch.

CAI would be a better first step over throttle bodies. But throttle bodies will still be a huge improvement once you have it.

cost me about 550 to have done me thinks. Sounds like a good price.

Post by **smorison** » Mon Aug 09, 2004 11:49 am

Gwido buddy

do you have any dyno results of your car???? i would love to see them...

RichardH · Post by **RichardH** » Mon Aug 09, 2004 11:56 am

Speaking of results (or lack of 'em), I can't find that review/test I had in a mag of throttly body boring out on a GPX. Bugger. And now I'm drowning in the magazines I up-ended looking for it! aargh....

Hey Gwido. Want to organise a back-to-back dyno run up at Hyperdrive in a month or so? ie. September some time? It'd be fun...

- Rich

Leigh · Post by **Leigh** » Mon Aug 09, 2004 11:59 am

hey dont forget me too!

RichardH · Post by **RichardH** » Mon Aug 09, 2004 6:02 pm

Hey... good plan!

I can go up against The Freak II... again. And lose... again.

A month or so would be good.

- Rich

GWIDO · Post by **GWIDO** » Tue Aug 10, 2004 4:09 pm

would love to rich but the cars in the shop atm. Gettin some panel work touched up and body kit fitted. Aswell as a bit of rice too.
Unfortunately its hard payin for mods on a students income so will be a couple of months till she's back...
I wish i had dyno figures for my car Steve but unfortunately that costs too.
Will get it done soon, maybe after the panel and paint, definately before i get NOS.

RichardH · Post by **RichardH** » Wed Aug 11, 2004 3:16 am

Body kit, bling and nitrous oxide on the shopping list first!

Now that's what I call setting priorities!!

So no dyno comparison then. Ah well. Once your car's back, are you still up for a head-to-head at MC Motorsport? I'll be back at the monthly practice days from September/October, and competing here and there as well...

- Rich

J1 · Post by J1 » Wed Aug 11, 2004 9:13 pm

i rang RPW the other day... to get the TB bored out to 63mm costs about $350 inc the butterfly valve... to get the whole unit replaced with a 65mm unit (inc all parts) was around $800... don't think that includes postage though...

$800 seems a little pricey for an extra 2mm though to be honest... and i'm personally not looking to have it done for a few months cos i'm just too broke right now (which i'm sure many of u can relate to

might get the old one bored out to 63mm and let u all know how it goes... btw, where do u ppl get your cars dyno'd? i need to do that at some stage

payaya · Post by **payaya** » Fri Aug 13, 2004 10:43 pm

boring out the throttle body might give an ample power increase, but do people really notice the gain while driving? I guess no?

Just say the power increase is 5KW at the fly, that equates to somthing like a 3% increase in power, but how is this noticable to anyone?

I dunno not saying its a not worthwhile modification, but in my eyes, its just a waste of money unless you go to the strip often and want to improve your times by .03 down the quarter.

But to the average guy, who never goes down the strip, is it really necessary?

Just my opionion i guess, i guess i expect too much

Post by **smorison** » Sat Aug 14, 2004 3:20 pm

payaya wrote:boring out the throttle body might give an ample power increase, but do people really notice the gain while driving? I guess no?

Just say the power increase is 5KW at the fly, that equates to somthing like a 3% increase in power, but how is this noticable to anyone?

I dunno not saying its a not worthwhile modification, but in my eyes, its just a waste of money unless you go to the strip often and want to improve your times by .03 down the quarter.

But to the average guy, who never goes down the strip, is it really necessary?

Just my opionion i guess, i guess i expect too much

your absolutely right, a lot of the power gain is in the mind... what sh*ts me is getting past on the front straight of a race track by 4cyl turbos... every little gain (Whether or not i can feel it) i'm after...

off the line speed is now however i'm more focused on mid to high end speed as that's where i use it... lowdown trque i can prepared to sacrafice a little for a better mid to top end run...

this is all based on my driving style... i'm not so worried about the street light 1/4 mile... whilst its nice to smash cars ... as a recent video shows my car isn't quicker from the start but it does start to pull away once we get into mivec range...

with the new mods (just at UAS and they are working over the weekend to modify a plenum and TB) ... we should be looking at a 10% or better flow increase... this won't show up low down however at the mid to high end it should allow the engine to run a bit leaner and produce more power.

payaya · Post by **payaya** » Sat Aug 14, 2004 3:48 pm

see in your situation that little bit extra will do you good, as you race etc.

So 10% extra flow which doesnt mean 10% more power, so whatever increase in power it is, its not going to be felt if you never go on the strip or track.

I highly doubt such a small performance mod can be felt by just driving around streets. For sure you want every little bit, you have a sort of marker to show if the mod works or not, by lap times, and quarter mile time slips.

So if you didnt race on the track or go down the quarter would you invest in this mod?

I guess im different, if the mod doesnt improve performance by a reasonable amount i wont do it.

For example i wont change all my plugs, leads, underdrive pulleys, lightened flywheel, just for tiny increase in power. If i wanted a quicker car i would get something that got more CC's or is forced induction.

Ive got the intake and exhuast all sorted out, obviously these two mods yeild one of the highest amount of power for the FTO. IF something like a cam or whatever comes along and shows it increases power substantially i'll consider getting them.

FTO AUSTRALIA

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