30 replies to this topic

[rabidh]

Well, I was just browsing ebay, and am now the proud owner of a gas flowed Z22SE head with some interesting cams. I'm guessing this is pretty much useless without a decent inlet/exhaust, so whats actually required to get some power out? I'll definitely remove the pre-cat, but is it worth replacing the std air filter? What gains would I get because I'd like to keep everything looking standard if possible... Will the gas flowing have increased the inlet diameters, so will I have to cut some of the inlet manifold away? Should I go and order a 68mm TB (and will that fit the original air filter pipe)? I may also remove the main cat too (and get an 02 sim), and I guess i'll have to remap the engine to get any serious power out - or will it be able to adjust itself enough to give a sensible performance boost? I'm trying to do this all on a (small) budget so I can justify it to myself - I'd like to keep it looking standard, and keep it reversible... I've been trying to buy a 2nd-hand cat pipe from Thorney for ages, but no luck yet Is it worth me skimming the head a bit while its off? It'd be good to increase the compression ratio a little - or are the valve clearances so close that this would be a problem? thanks, G.

[speedster]

Full Milltek with CELL 200 CAT + ITG Induction kit + 68mm throttle body + Remap done on an Rolling Road. To get the most out of your head you should also acquire a high flow exhaust manifold!

[minime]

might be worth looking at the dbilas inet and exhaust manifolds + itg+ remapp+ a good exhaust with a 100cell motorsport cat

[pauln]

Full Milltek with CELL 200 CAT + ITG Induction kit + 68mm throttle body + Remap done on an Rolling Road. To get the most out of your head you should also acquire a high flow exhaust manifold!

Do peeps here match the ports up with the manifolds?

Curious as we found gains could be found doing this on some K-series engines.

Also, who does the porting and are there various types of port. Again on the K-series, there were various types of ports and an engine drove differently depending on who ported it.

I have an AMD ported car. Who will have done that work?

Just curious.

P.

[christurbo]

How much BHP will this give us???

[rabidh]

but i'm not sure they'll be cheap And most of those will be very obviously non-stock Any chance you could put prices by those? Full Milltek - £1000+ 200 cell cat - £60 if DIY 68mm TB - £100 RR Remap - £250? ITG Induction - £100 WeaponR Exhaust manifold? Dbilas Inlet? Dbilas Exhaust? edit: No idea who did the work. Prob some chav with a dremel No idea even what type the upated cams are - It was a bit of in impulse purchase - For £200 it seemed like a fair chance to take.

Edited by rabidh, 04 May 2006 - 02:51 PM.

[clipping_point]

You cannot port the standard manifold to the area of a ported head. Also the dBilas inlet manifold is made for a standard head, not a ported one. Thats why I will try to make one of my own, I´ve got 16 cm2 ports in my head.....

[rabidh]

Thats why I will try to make one of my own, I´ve got 16 cm2 ports in my head.....

I must admit the same idea occurred to me. Do you think it is possible/sensible to make an inlet manifold out of glassfibre? I seem to recall seeing some porshe race engines that used fibreglass components

tbh I don't think i'll be very concerned about tuning - just go for the widest + smoothest path to the TB.

[meldert]

Dude used to have a fiberglass intake manifolt on his race speedster. Well, the plenum chamber was fiberglass and the runners/trumpets (whatever they are called in english) and the attachment to the head were made of aluminium.

If you'r really handy with fiberglass you may be able to do all of it in fiberglass but I doubt that's practical...

There is a swedish guy on a swedish race/sports car forum who even makes (among other things) his own trumpets from carbonfiber, vacuum bagging and everything, all at home in his garage... It's quite amazing, lots of specially made CF parts for an old Austin Healey Sprite...



So I guess everything is possible.

Edited by meldert, 04 May 2006 - 03:27 PM.

[rabidh]

Nice So Dude used throttle bodies? Why do I get the impression this is going to get much more expensive than i'd hoped for? I guess I might as well look at using some bike TBs - off ebay they seem about the same cost as buying the 68mm one. Any cheap progammable ECUs people know of? They don't have to be fbw, as i'm pretty sure I can get around that with a PIC/Servo arrangement. edit: I know of megaSquirt, but last time I looked this didn't do spark timing. Has it changed?

Edited by rabidh, 04 May 2006 - 03:45 PM.

[meldert]

Nice So Dude used throttle bodies?

No dude didn't (don't) use 4 tbs he has one large TB into a plenum chamber with trumpets directly to the head...

Here is a pictur from his race car thread:

[rabidh]

Ahh right. Well, that looks pretty good though. Definitely achieveable. So... anyone have any ideas for *cheap* modifications? Ideally I want all this to cost me less than £500, but thats probably hopelessly optimistic. So far, I have: 68mm TB homemade intake manifold remove precat/cat rolling road remap how much is a proper RR remap likely to set me back then? Thorney doesn't give any prices on his site as far as I can see.

[vocky]

I saw the head on ebay, it's still got the standard valves might be worth fitting some competition valves instead looks like a courtenay head to me, so hopefully it's the piper cams in it I would recommend the weaponR 4-2-1 exhaust manifold, as for the inlet probably the dbilas is easiest to fit. I did fit a vw 16v inlet manifold with some major mods, but the ecu didn't like it, I will try it again later in the year The standard inlet can be modified to give better flow, this I also recommend and it's cheaper 68mm TB is quite suited to a gas flowed head + cams, needs a couple of mods to fit it

[rabidh]

looks like a courtenay head to me, so hopefully it's the piper cams in it

Thanks - thats good to know. Shame about the valves, but i'd imagine it would still be a lot better than stock. Are competition valves bigger (so they need new inserts?) or is it just that heat dissipation is better?

How much did the weaponR and dbilas inlet set you back? The weaponr looked awesome. Does it fit in a normal VX or do you have to remove the boot?

Are the mods to the 68mm TB just mountings, or are the electrical connections different too? Will the standard ECU be happy? i could imagine that a bigger TB would really confuse it.

[vocky]

competition valves are a different shape and flow better, but you can buy them the standard size clipping point is the best person to ask about fitting a weaponR, but you do need to loose a small section of boot space as for the 68mm TB, an adaptor plate is required and the electrical connections require changing, but the standard ecu will run fine with it

[rabidh]

Thanks. I'll definitely take a look at the 68mm TB and valves then. As for the weaponR, I can't really go for hacking my boot around. The VX is my only car, and I need all the boot space there is I'd also like anything I do to be reversible.

[meldert]

As for the weaponR, I can't really go for hacking my boot around. The VX is my only car, and I need all the boot space there is I'd also like anything I do to be reversible.

Well, you could always build your own exhaust manifold...
I have actually started on one myself, it's not finished yet and will be combined with a full custom 2,5" exhaust system. It's similar to the One in Dudes race car but made to be able to fit without removing any boot space...

A couple of pics: (I should probably start an own thread about this...)





Yes, even my exhaust manifold will probably need a wery small modification of the boot, but it it possible to aviod that...

The material cost for the full system made of stainlees steel (including race cat and silencer) will probably be somewere around £700-£800... As for preformance gains, nothing is guaranteed, we will see in the end...

Edited by meldert, 05 May 2006 - 02:23 PM.

[cicastol]

Well, you could always build your own exhaust manifold...
I have actually started on one myself, it's not finished yet and will be combined with a full custom 2,5" exhaust system.

!!!
Well done,where did you taken the exhaust flange??

[meldert]

Well, you could always build your own exhaust manifold...
I have actually started on one myself, it's not finished yet and will be combined with a full custom 2,5" exhaust system.

!!!
Well done,where did you taken the exhaust flange??

At the moment the exhaust flange is just a blank dummy plate during build up and welding of all the tubes, when that is finished I have a water cut exhaust flange that I vill use. I got that one from Dude, he had a few of them made for his race car. They probably just copied the original or maybe the gasket, I'm not shure...

[rabidh]

It looks great. And thats all made of those angle sections you can buy? It must take a while, but I'd imagine its worth it. What do you do about vibrations from the engine? Didn't the original have a Stainless Steel woven thing to allow for some slop, or isn't it really a big deal?