ITRCA

Just looking to get some more power out of whip, should I upgrade my throttle body to a bigger bore? Which size?

Head:
Ferrea Valve Springs
Ferrea Retainers
Skunk 2 Adjustable Cam Gears
Buddy Club Spec 4+ Cams
RC 370cc Injectors

Block:
Oversized CTR Pistons 81.25mm - Yielding 12.5:1 Compression
ARP Rod Bolts
ARP Head Studs
Toda Timing Belt
ACT Clutch
TODA 10lb Flywheel


Exhaust:
Header-Tech Header (3” Collector)
Thermal R&D 3" Exhaust

Thanks.

What intake system are you using? stock, aem cai, mugen, injen ?

Unless you are using a Mugen I would get that first. delivery of the air might be more benificial then the 62mm hole it goes thru.

AEM 3" CAI

Bore it, but I agree with Rob, if you want max power do the Mugen intake first, then bore it.

What do you guys think of the the Spoon throttle body? It creates a venturi effect IIRC.

Dave B wrote:Bore it, but I agree with Rob, if you want max power do the Mugen intake first, then bore it.

Bah, I don't feel like buying another intake. I rather just get ITBs and call it a day

I had mine bored. Cost me like $100 if that. It is a taper bore meaning that the butterfly end stays the same and it "tapers" out to 70mm. Spoon spec basically. I believe the butterfly end stock on an ITR is 62mm. Most peeps that are considering an upgrade in the TB area would want a bigger bore at the butterfly, ie: 68-72 or 70-72 or 70-74.

Would I do it again? Hard to say. Maybe. If I were running a lot of boost or a huge N/A set-up *cough, cough, Bradstard, cough, cough* then it would seem to be more relevant.

Just my $0.02.

how much is a spoon throttle body worth now a days anywho??

white rocket wrote:I had mine bored. Cost me like $100 if that. It is a taper bore meaning that the butterfly end stays the same and it "tapers" out to 70mm. Spoon spec basically.

Hmm... I didn't know that the spoon TB still has the same size butterfly. Ill cross that off the list then.

So my original question wasn't really answered, what would be a good size for my engine? And a good brand to go along with it?

http://www.maxbore.com - best pricing, great turnaround time- if you send the itr TB he can make it 65mm taperd to 70! which IMP is suitable for alot of NA type setups.

neo_ wrote: So my original question wasn't really answered, what would be a good size for my engine? And a good brand to go along with it?

I still say, maximize your intake potenial first, then worry about the TB.
Once you have maxed out the intake you can adjust your TB to the proper volume needed.

<-- Just my .02

Bbasso wrote:

neo_ wrote: So my original question wasn't really answered, what would be a good size for my engine? And a good brand to go along with it?

I still say, maximize your intake potenial first, then worry about the TB.
Once you have maxed out the intake you can adjust your TB to the proper volume needed.

<-- Just my .02

Show me Dyno graphs of the AEM 3" vs the Mugen please. Everyone says its better, but I haven't seen a dyno of them compared.

I can't really see my buying a $650 intake. I might just as well dump a little more cash and get ITB's.

if anything.. i have an ericks racing TB for sale.. its 70 mm... lookin to get 250 for it?

lmk

Increasing the bore of a single throttle body should be one of the very last things you do to your motor build.

Almost everything else will be a better return for the money.

For example, the Spoon throttle body will give you about 2 HP in addition to all your other improvements. It will give you the edge against other cars in a race, if everybody is otherwise adhering to the rules, but you can see that it's a relatively high price to pay for 2 HP.