lee987lee
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| posted on 24/8/11 at 03:56 PM |
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Throttle bodies to replace twin 45's but witch one
Hi.
I'm running a 2.0 zetec engine with twin 45's at the moment.
I'm wanting to put some throttle bodies and new ecu on to get the most bhp I can with a re-map
I'm unsure what the best throttle bodies to use are I've been told both gsxr1000 or r1's will be good but as anyone used any?
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JimSpencer
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| posted on 24/8/11 at 04:18 PM |
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Hi
Unless the 45's are set up badly the ultimate BHP shouldn't change much.
ITB's score on their driveability, better fuel economy and theoretically a bit more mid range torque, but ultimate top end there's
normally next to nowt in it
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lee987lee
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| posted on 24/8/11 at 05:06 PM |
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quote:
Originally posted by JimSpencer
Hi
Unless the 45's are set up badly the ultimate BHP shouldn't change much.
ITB's score on their driveability, better fuel economy and theoretically a bit more mid range torque, but ultimate top end there's
normally next to nowt in it
a few people have said that but im getting quite a few flat spots at low revs, the other reason for getting them is my mate is a mapper and said he
can get 200BHP safe with them and a new ecu
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andylancaster3000
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| posted on 24/8/11 at 05:13 PM |
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Take the contents of the carbs out of the bodies. Replace the chokes with a 45mm ID sleeve. Ta da - throttle boddies!
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big_wasa
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| posted on 24/8/11 at 05:24 PM |
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You will not get 200bhp out of a zetec without cams and a good head porting.
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Paul Turner
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| posted on 24/8/11 at 05:28 PM |
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big_wasa is spot on. The most a pair of TB's will add over a pair of well set up carbs is 10bhp if you are very lucky, however they will vastly
improve drivability (if mapped correctly) and economy and emissions.
Paul
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big_wasa
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| posted on 24/8/11 at 05:39 PM |
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remember the chokes on a set of 45's are going to be 36~38mm the ports on a standard head are about 40mm so there is no point in going much
bigger.
I couldnt get the 45's set up spot on either and the efi is much nicer. Bike carbs would be a cheaper option but once you go efi you wouldnt
want to go back to carbs.
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austin man
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| posted on 24/8/11 at 05:56 PM |
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b rother in law runs amapped 2 litre with new cam, fully lightened and balanced, stage 3 head and TB's from he is getting 199 bhp. Engine was
built by Stanwood engineering (who build zetecs for Formula Ford) and tuned by Dave Walker. If your mate can get 200 from a standard lump lets have
his details could save me a fortune on tuning my 1.8
Life is like a bowl of fruit, funny how all the weird looking ones are left alone
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cliftyhanger
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| posted on 24/8/11 at 05:59 PM |
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I reckon 175bhp is about the max on a std zetec and TB's. that is what dunnell claim with their kit, and they seem to know whats what. I suspect
a good mapper should/may get close to that with a well built setup, dunnell supply Jenvey TB's.
http://www.dunnellengines.com/zetec_inj_optionkits_4.php
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teegray19
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| posted on 24/8/11 at 07:03 PM |
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zx10r?
ive got some 2006 zxr10r TB's pritty cheap from ebay, they can be spaced or re packaged, that's why you would have been advised on the
gxr1000's however look at something with a big figure of torque and hp, otherwise you may be needing to fit another line of injectors for the
fuelling at high revs.
ive actually went back on my idea of TB's when i was speaking to a professional on tuning, he was saying crazy fiqures like 800quid for a ecu
map and tune, baring in mind my engine cost me 150quid.
id go crazy and turbo some bike carbs, and get a piggy back ecu to change the timing to make it more drivable, trust me its the most fun!
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mrwibble
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| posted on 24/8/11 at 07:04 PM |
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quote:
Originally posted by cliftyhanger
I reckon 175bhp is about the max on a std zetec and TB's. that is what dunnell claim with their kit, and they seem to know whats what. I suspect
a good mapper should/may get close to that with a well built setup, dunnell supply Jenvey TB's.
http://www.dunnellengines.com/zetec_inj_optionkits_4.php
reckon 150 is more realistic.
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austin man
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| posted on 24/8/11 at 08:10 PM |
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Tuned standard engine griffin induction will give around 155, pair of Mild Cams 165
Life is like a bowl of fruit, funny how all the weird looking ones are left alone
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Fizzer
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| posted on 29/8/11 at 08:00 PM |
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My Spec:
2.0 Blacktop zetec (£100 from a breaker) 
weber 45's
newman fast road cams
Lightened flywheel
+
3 hours @ Northampton motorsport
= 179 BHP
It's pretty driveable too, it used to have flatspots and ran like a dog when I bought it. I managed to tune them out myself. NM sorted out the
'fine tuning' with the jetting and ECU.
I reckon I could get closer to 190 with TB's - not much gain for large expense, I spent the money on better brakes and an ARB instead
I think my only reason to change is if I 'went boost'
with zetec's - as far as I could tell:
standard efi + normal cams - 130
carbs or tb's + normal cams - 145-155
carbs or tb's + fast road cams - 175-195
if it's dunnel, add 10 hp for good measure - and a few hundred quid 
as others have said above, switching from carbs to tb's gains some power, but mostly driveability etc.
larger power gains come from improving the breathing (decent exhaust, hot cams porting/polishing)
+ a decent engine tuner will be the best bhp your money you can buy (let's face it, it sounds like your motor isn't making you smile right
now...)
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