tu5j4 valve size

1. da1gingertiger L-plater Joined: Feb 2012 Posts: 61

   #1 31st March 2014, 17:35

   Hi after abit of advice middle of last year had car rr achived 186hp not really happy with results current spec
   
   high comp pistons
   forged rods
   newman stage 5 cams
   headwork
   at power itb's
   omex 600
   2" exhaust (being changed as 1 of the restrictions)
   
   is it possible to fit jp4 valves or is it not worth it or just fit proper oversized valves dont want to change head as spent alot on headwork thanks
2. welshpug Saxperience Forum Bum Joined: Jul 2010 South Wales Posts: 3078 ZX 16v, 205 GTI, 309 Goodwood, 405 MI16.

   #2 31st March 2014, 19:54

   no need for bigger valves, but I would change the bodies to a Satchell/Brown inlet.
   
   
   also, was that on an engine dyno or a rolling road? where were those figures given?
   
   
   cam timing confirmed? good map?
3. raunchz Saxperience Addict Joined: Jul 2005 Solihull / Bournemouth Posts: 14233 2015 Lapiz Blue Golf R

   #3 31st March 2014, 20:12

   Define headwork - who did it?
   
   
   Sent from my iPhone using Tapatalk

   1 user thanked this post: user_39461
4. da1gingertiger L-plater Joined: Feb 2012 Posts: 61

   #4 1st April 2014, 16:34

   The figure was given on rolling road at northhampton motor sport cam timing was adjusted needed more but maxed out as only using original pulleys at the moment changing when exhaust done as for head work cant be sure but could find out the build wss done at a engine builder near me but they sent head somewere as they dont do much on the head work side how much of a difference would changing the at bodies make ? Thanks
5. user_13958 Saxperience Forum Bum Joined: Feb 2007 Posts: 3068

   #5 1st April 2014, 17:04

   How does it drive?
6. da1gingertiger L-plater Joined: Feb 2012 Posts: 61

   #6 1st April 2014, 18:13

   It drives fine pulls well from 3500 to around 7800 bt makes power to 8500
7. raunchz Saxperience Addict Joined: Jul 2005 Solihull / Bournemouth Posts: 14233 2015 Lapiz Blue Golf R

   #7 4th April 2014, 19:29

   I'd look at how the bodies, exhaust manifold design, headwork and the cams are all working together.
   
   Get those all right to work together and I think you'll free up more power (dare I say near 200bhp?!)
   
   What exhaust manifold you using? What exhaust? CAT fitted?
8. da1gingertiger L-plater Joined: Feb 2012 Posts: 61

   #8 4th April 2014, 21:42

   Took head back to builder today to be checked and valve guides to be cut back if possible exhaust manifold is a piper exhaust is a saxsport being changed to a 2 and half custom with decat other changes will be pulleys asked builder to get a graph for the head when it was on flow bench
9. raunchz Saxperience Addict Joined: Jul 2005 Solihull / Bournemouth Posts: 14233 2015 Lapiz Blue Golf R

   #9 5th April 2014, 08:51

   Sounds like you're going the right way - keep up updated.
   
   
   Sent from my iPhone using Tapatalk
10. welshpug Saxperience Forum Bum Joined: Jul 2010 South Wales Posts: 3078 ZX 16v, 205 GTI, 309 Goodwood, 405 MI16.

    #10 5th April 2014, 09:49

    You don't need flow bench data, Sandy Brown doesn't use a flow bench and builds probably the most rounded and powerful TU engines out there at the moment.
11. da1gingertiger L-plater Joined: Feb 2012 Posts: 61

    #11 5th April 2014, 15:07

    I no what your sayin but as I have read on here sandy is the one and only when it comes to these engines and so doesent need the data but as my head wasent done by him just for piece of mind I would like to no if the head will flow for what I want to achieve if it comes back that it will onto changing the other parts that maybe stopping me
12. raunchz Saxperience Addict Joined: Jul 2005 Solihull / Bournemouth Posts: 14233 2015 Lapiz Blue Golf R

    #12 6th April 2014, 11:47

    You're only problem is that flow bench data doesn't normally tell the whole story - it should give you an idea but won't necessarily equal good performance.
    
    Am interested to see how this unfolds as it's always interesting trying to find the bottleneck holding things back
    
    
    Sent from my iPhone using Tapatalk
13. da1gingertiger L-plater Joined: Feb 2012 Posts: 61

    #13 6th April 2014, 17:30

    I will let u no how it goes should be back on rr in a month or so was never expecting sandy power as all parts are off the shelf I surpose head cant be that bad as 186 not to bad hopefully changing exhaust to 2 1/2 and the manifold collector to 2 1/2 does the trick thanks for replys will update asoon as its done

    1 user thanked this post: raunchz