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displaying posts 1 to 18 of 18
| Author | Subject: ITB's |
 mark t
Junior User  Location: Wantage Registered: 28 Feb 2011 Posts: 93 Status: Offline |
Post #1
Couple of quick questions. What sort of gains can be expected from running ITB's on a standard engine and has anyone here fitted bike ITB's before? Are cams required to really make a difference and what can you run before taking the engine appart?Sorry for the daft questions Mark |
 Posted 6th Mar 2011 at 22:30
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mark t
Junior User Location: Wantage Registered: 28 Feb 2011 Posts: 93 Status: Offline |
Post #2
Just read Kent PT81's are close to the limit on the cam front, are they a regrind or from a blank and are solid lifters/double valve springs required? |
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Posted 6th Mar 2011 at 22:37
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pugjim
Seasoned Pro  Location: Sheffield Registered: 11 Mar 2007 Posts: 1,380 Status: Offline |
Post #3
I built an engine with piper 270 regrinds, a bit of head porting, fully balanced bottom end and lightened flywheel, cosworth green injectors, jenvey 45 TB's and port matched jenvey/longmann manifold and saw 215bhp at flywheel on dyno. |
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Posted 7th Mar 2011 at 00:25
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mark t
Junior User Location: Wantage Registered: 28 Feb 2011 Posts: 93 Status: Offline |
Post #4
Good results, who did you get your Jenveys from? |
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Posted 7th Mar 2011 at 00:26
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pugjim
Seasoned Pro Location: Sheffield Registered: 11 Mar 2007 Posts: 1,380 Status: Offline |
Post #5
mark t wrote: Good results, who did you get your Jenveys from? Direct from jenvey, think they were about £360 |
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Posted 7th Mar 2011 at 00:28
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mark t
Junior User Location: Wantage Registered: 28 Feb 2011 Posts: 93 Status: Offline |
Post #6
Standard ecu remapped? and did that include the manifold? |
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Posted 7th Mar 2011 at 00:29
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daveyboy
aka Jim Davey  Location: Southampton Registered: 01 Oct 2007 Posts: 8,648 Status: Offline |
Post #7
For comparison I had Jenvey 45s on a completely standard engine, with a S/Steel exhaust and a decat and I got 179.________________________________________ R H Davey Welding Supplies. I sell new and used welding equipment in the Hampshire area. I take on welding jobs in the evenings, ally casting repairs are one of my specialities but I can weld pretty much anything. PM me with your requirements.Some of my services: (See my for sale threads) Engine mount/chassis repair Solid Beam Mounts BACK IN PRODUCTION Harness bars |
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Posted 7th Mar 2011 at 00:29
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mark t
Junior User Location: Wantage Registered: 28 Feb 2011 Posts: 93 Status: Offline |
Post #8
Really? what's standard again 167? |
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Posted 7th Mar 2011 at 00:31
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pugjim
Seasoned Pro Location: Sheffield Registered: 11 Mar 2007 Posts: 1,380 Status: Offline |
Post #9
mark t wrote: Standard ecu remapped? and did that include the manifold? That was a DTA E48 ecu, manifold was about £120. Also it is in a 205 GTi (not like that should make a difference) |
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Posted 7th Mar 2011 at 00:31
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rallyeash
Seasoned Pro  Location: Devizes Registered: 11 Dec 2006 Posts: 4,424 Status: Offline |
Post #10
yep, generally standard tb'd engines turn out 185hp________________________________________ 230 hp 2.1 16v XU 205 rallye on jenveys Project thread here309 3dr K20 Type R |
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Posted 7th Mar 2011 at 00:33
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daveyboy
aka Jim Davey Location: Southampton Registered: 01 Oct 2007 Posts: 8,648 Status: Offline |
Post #11
mark t wrote: Really? what's standard again 167? 12-14 years ago, before a a few thousand miles of accumulated wear and neglect yeah  ________________________________________ R H Davey Welding Supplies. I sell new and used welding equipment in the Hampshire area. I take on welding jobs in the evenings, ally casting repairs are one of my specialities but I can weld pretty much anything. PM me with your requirements.Some of my services: (See my for sale threads) Engine mount/chassis repair Solid Beam Mounts BACK IN PRODUCTION Harness bars |
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Posted 7th Mar 2011 at 00:33
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daveyboy
aka Jim Davey Location: Southampton Registered: 01 Oct 2007 Posts: 8,648 Status: Offline |
Post #12
mark t wrote: Just read Kent PT81's are close to the limit on the cam front, are they a regrind or from a blank and are solid lifters/double valve springs required? Steer clear of solid lifters unless you are going for high rpm and radical cams. The valve springs are doubles as standard. However if you want to set any kind of performance cam correctly you need to pocket the pistons for safety, it's just too close to take a chance, especially if the head has ever had a skim. ________________________________________ R H Davey Welding Supplies. I sell new and used welding equipment in the Hampshire area. I take on welding jobs in the evenings, ally casting repairs are one of my specialities but I can weld pretty much anything. PM me with your requirements.Some of my services: (See my for sale threads) Engine mount/chassis repair Solid Beam Mounts BACK IN PRODUCTION Harness bars |
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Posted 7th Mar 2011 at 00:36
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maddriver9
Regular  Location: nr leek Registered: 12 Mar 2008 Posts: 341 Status: Offline |
Post #13
my mate has weber throttle bodies and omex doing 186 bhp but my standard 6, well just an air filter and decat made 178 bhp on the same rollers. ________________________________________ 178bhp 205gti6¼ mile in 14.2 |
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Posted 7th Mar 2011 at 00:41
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mark t
Junior User Location: Wantage Registered: 28 Feb 2011 Posts: 93 Status: Offline |
Post #14
By the sounds of things it is best to either not go with camshafts at all or something very mild ie regrinds. Also read that the standard heads cant be improved upon. ITB's don't seem to have much bang per buck either.Prob best to concentrate on suspension and brakes lol |
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Posted 7th Mar 2011 at 00:42
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ryangti6
Seasoned Pro  Location: Pontypool Registered: 01 Sep 2006 Posts: 1,839 Status: Offline |
Post #15
It's not that the standard head cant be improved it's more of a case that it flows well enough to get the power most will be chasing so no real gain to be had. I've never been in a cammed one but power for money doesnt seem like it would be worth it to me tbh and it doesnt seem like there is much point in Itb's without cams. You are right that it's probably best to concentrate on suspension and brakes etc but again unless you want to spend a lot of money I would go for new o.e parts. Good condition standard items are more than good enough for a car with standard power unless you are looking to do track work. It's the balance these cars have as standard that make them great Imo ________________________________________ Ryan |
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Posted 7th Mar 2011 at 01:18
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mark t
Junior User Location: Wantage Registered: 28 Feb 2011 Posts: 93 Status: Offline |
Post #16
Some fair points there, just out of interest (I know its the wrong section but cant see any point starting a new thread lol) are the front struts an outer casing with a replaceable insert? |
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Posted 7th Mar 2011 at 01:23
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pugjim
Seasoned Pro Location: Sheffield Registered: 11 Mar 2007 Posts: 1,380 Status: Offline |
Post #17
mark t wrote: Some fair points there, just out of interest (I know its the wrong section but cant see any point starting a new thread lol) are the front struts an outer casing with a replaceable insert? nope |
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Posted 7th Mar 2011 at 01:31
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mark t
Junior User Location: Wantage Registered: 28 Feb 2011 Posts: 93 Status: Offline |
Post #18
Cool, thanks |
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Posted 7th Mar 2011 at 01:36
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