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Spot the difference (snail-net beware)
Posted: Sat Jan 19, 2008 12:42 pm
by Woo
The stock throttle body (55 mm) is only good for 300 HP, so it had to go. The only problem is that as everything in the MX5 is such a tight squeeze. The only replacements available were too long and my intercooler bend is tight enough as it is ....
Alternative,
I'm happy with the result, gives me ~30% more area (75 mm). The Phosphour bronze for the butterfly is coming on Monday, so should be ready to fit next week 'bout time too
btw the stock TB is on the right
Woo
Posted: Sat Jan 19, 2008 2:02 pm
by neil d
Did you buy this item or get it machined?
I'm keen to find out more details.
Neil
Posted: Sat Jan 19, 2008 2:39 pm
by mr_rotary
Very nice and well made. Any performance gains from one of these on an N/A engine?
Re:
Posted: Sat Jan 19, 2008 4:12 pm
by Woo
neil d wrote:Did you buy this item or get it machined?
I'm keen to find out more details.
Neil
Brought the billet of T4610, machined it on a FANUC lathe and OKI 5 axis mill (both CNC via Mastercam), Neil. Really only built as a one of, I'm not trying to sell them.
Mr_rotary, upto 300 HP, the throttle body isn't a restriction, so it wouldn't help N/A (probably make the low revs worse). Generally the manifolds, valves and head will be the bottleneck before the TB.
FWIW, Skunk make a 70 mm (Skunk2 actually) that is good for 6-700 HP that with a bit of modification would fit, unfortunately the IC to TB pipework comes from below on my F/I, hence the lack of room to fit one of these.
Anyone contemplating the Falcon TB swap, imho it's more agro than it's worth (totally different configuration).
Cheers,
Woo
Posted: Sun Jan 20, 2008 10:15 pm
by neil d
I was looking at a similar job and just interested in if you fabricated it or purchased it over the counter.
Looks good.
Neil
Re:
Posted: Sun Jan 20, 2008 10:45 pm
by OMY005
Woo wrote: OKI 5 axis mill
Nice machine.
Good job as well.
Andrew.
Posted: Wed Jan 23, 2008 10:16 pm
by Sean
AVO used to rebuild standard one to (ithink 4mm) oversize, complete swap over item, can't remeber exact specs or price.
Hardest part is getting the new throttle plate to seal well.
Posted: Wed Jan 23, 2008 11:11 pm
by Okibi
Wow all sounds and looks very impressive
Re:
Posted: Thu Jan 24, 2008 9:43 pm
by Woo
Sean wrote:Hardest part is getting the new throttle plate to seal well.
With the CNC most of the hard work is done for you. Of course you could always put a smeer of latex on like Mazda did
Thanks
Woo
Posted: Tue Jan 29, 2008 7:16 am
by hamish71
Yes, have seen that thread....note that \"Woo\" did this himself, and is not a \"supplier\" as such. I have been chatting to him about the options.
I was hoping that someone could verify whther there was a melbourne business, such as efi hardware, had done this sort of work for mx5s before.
Posted: Tue Jan 29, 2008 7:17 am
by hamish71
oops....wrong thread...sorry