Warren G
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Registered: 14th May 06
Location: Kent
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right which sizes are best to use 38mm (gsxr 600 bodies) or 42mm (gsxr 750/1000 bodies) bearing in mine power is useless if its still riseing above the rev limit! so my thinking is 38mm more touque (better driveablity) and less power but not so high rpm. will rev no more that 7500 to 8000rpm
by the way on a x16xe project (gathering parts  )
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RobHayes
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Registered: 6th Sep 03
Location: Lincolnshire
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id say 42mm, most 16xe kits are either 40mm or 45mm (mine are 45mm)
38mm would be slightly small i'd say
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Warren G
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Registered: 14th May 06
Location: Kent
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i see you've got throttle bodies (real ones  ££££)
iv got a fse boost valve, but everones saying there crap??what do you use?
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Warren G
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Registered: 14th May 06
Location: Kent
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http://www.migweb.co.uk/forums/vauxhall/mechanical-electrical/253703-c16xe-help-info-bike-bodies-2.html?highlight=throttle+bodies
read near the end, was going for 42mm, but read that and fort 38mm could be better, is your power still rising past 7500rpm?
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Sly_SRi
Premium Member
Registered: 9th Apr 04
Location: Reading, UK Drives: Corsa C
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why not use 42mm bodies but use longer trumpets to increase the torque
Corsa C Z20Let
Black Sleeper Turbo Project
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Warren G
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Registered: 14th May 06
Location: Kent
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its pretty tight to fit 90mm trumpets isnt it? one thing i dont understand is why cant have curved trumpets? so they then face up towards the bonnet, would that be better 
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RobHayes
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Registered: 6th Sep 03
Location: Lincolnshire
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i have an FSE boost valve, and they are crap. im after a fixed rate unit, but they're more expense, which i dont need at the minute
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ed
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Registered: 10th Sep 03
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Get a fixed rate Webber FPR. One off of a 2WD Sierra Cossie will fit apparently.
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ed
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Registered: 10th Sep 03
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If you have problems with your FSE. You can get a pressure gauge for the FSE to make it easier to adjust too.
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James R
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Registered: 4th Feb 03
Location: 205GTi16/306GTi16
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Unless you are intending to go for 190BHP, then 38mm will give much better midrange response over 42mm.
remeber Grp A WRC cars, run 300BHP of air though a single 34mm appeture. so no tliek flow till be an issue.
FSE valves, the diaphrams are known to fail. You can buy webber jobs for abotu £30, you dril out the plug and they are adjustbale. you leave the vac line disconnected with bodies aswell.
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TomSBD
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Registered: 22nd Jun 06
Location: Spalding, Lincs
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quote:
Originally posted by warren.g
its pretty tight to fit 90mm trumpets isnt it? one thing i dont understand is why cant have curved trumpets? so they then face up towards the bonnet, would that be better
not that tight mine fit ok, and thats on a 2.0
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Dave A
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Registered: 10th Dec 03
Location: County Durham
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I would go for the 38mm ones. (i would actually just buy a proper set-up)
its the shape and length of the inlet that will make the most difference to where the engine makes the torque.
my trumpets are 90mm and im also using a 30mm stack so they are infact 120mm trumpets.
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Warren G
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Registered: 14th May 06
Location: Kent
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proper set it too much for me, think il go for the 38mm bodies (go cheaper than 42mm too )
bought a sbd inlet + fuel rail(for bodies) so will be atacting to that so 90mm to 120mm are best then?
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Sly_SRi
Premium Member
Registered: 9th Apr 04
Location: Reading, UK Drives: Corsa C
User status: Offline
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You can get curved trumpets from jenvey 
Corsa C Z20Let
Black Sleeper Turbo Project
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Warren G
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Registered: 14th May 06
Location: Kent
User status: Offline
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@ £37 each? £150 for 4 airhorns!!! 
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Dave A
USER UNDER INVESTIGATION - DO NOT TRADE
Registered: 10th Dec 03
Location: County Durham
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dont bother with curved ones. get the 120mm ones anc cut a hole in the bulkhead.
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csweatherston
Member
Registered: 16th Jan 06
Location: Devon
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dont use any....attach a 'viper' cold air feed to each throttlebody....
put 1 - under your front numperplate..
1 - in your n/s/f wheel arch
1 - in your o/s/r wheel arch
and the other inside the car.....
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Warren G
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Registered: 14th May 06
Location: Kent
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dave, what about filters, iv heard 'sock' filters rub power (cant see how)
http://www.sbdev.co.uk/Main.htm - normal filters, or NO filter? some people run with no filter iv noticed
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ed
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Registered: 10th Sep 03
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Sock filters ruin the venturi effect (I think) you create when using trumpets. The best way of running TB's is either with no filter, or to seal the trumpets in an airbox with a single filter. You can buy off the shelf setups.
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Dave A
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Registered: 10th Dec 03
Location: County Durham
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I was concerned about the filters I was using at the moment so when I went to get more mapping done at Noble Motorsport recently they did a power run with and without the filters. ther was no real difference in the 2 results.
this is the type im suing, only £15 from Rally design:
as long as you have plenty of clearance between the mouth of the trumpet and the inside of the filter you will be fine. I know single sock filters can sap power though.
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Warren G
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Registered: 14th May 06
Location: Kent
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i no its not related but are you running an up rated clutch? (guessing you are) or is the standard clutch able handle 160bhp? if it is il fuck mine up and get a new one parts warranty thats when i take the lightened fly out of currant car
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Dave A
USER UNDER INVESTIGATION - DO NOT TRADE
Registered: 10th Dec 03
Location: County Durham
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Im using a sachs uprated clutch. pretty sure the standard one will cope anyway as its the torque that kills them rather than high bhp.
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RobHayes
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Registered: 6th Sep 03
Location: Lincolnshire
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im using a standard one, and a standard f13cr g/box
loves every second of it
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James R
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Registered: 4th Feb 03
Location: 205GTi16/306GTi16
User status: Offline
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quote:
Originally posted by ed
Sock filters ruin the venturi effect (I think) you create when using trumpets. The best way of running TB's is either with no filter, or to seal the trumpets in an airbox with a single filter. You can buy off the shelf setups.
The power difference between a dome or sock filters is negliable. The air box set up only improves power if made correctly to act as a Hertz resonator and boosts torque, dependant on the volume you make relative to the cam timing, inlet length and so on. Most ppl just do it to keep noise down for trackdays.
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Warren G
Member
Registered: 14th May 06
Location: Kent
User status: Offline
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quote:
Originally posted by RobHayes
im using a standard one, and a standard f13cr g/box
loves every second of it
whats the f13 box off, arent most corsa's fitted with f15's?
and also is the gm head gasket up for the job, or would you recommend a sdb one, dave? 
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