2.4 Inlet General 2.4 Inlet Manifold Questions

[Hareng]

jAMEe I put one of these on last week.
The 2" bore downpipe butts up and does not fit inside. Says 270mm long, think what you chop out is either 320 or 340mm long close to the original length.
http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... :middle:uk

It does make exhaust note deeper, no raspyness and generally louder all through the rev range.

 

[Jamee]

All in all, worth it then and is it easy to fit, or just fiddly??? What about response, quicker.

 

[Hareng]

My lambda or IAT or something is playing up, but there are gains as well as being more economical. One less restriction and legal.
I did mine on my own, just cut out the cat section square, deburred and filed the rust off the joints. Replaced flexi while i was at it.
I would bolt the downpipe to the three bolt flange and the lambda sensor tubing cut off after the cat on to the exhaust- Line up the cat and tack weld unstressed, same with flexi or guaranteed to break. Remove complete and fully weld.

Can sense the exhaust manifold is now the weak link, now on hold.

 

[markv]

Fitted my 2.4 manifold last week. Results are on the link below:

http://www.verboom.net/projects/speedst ... index.html

Pretty happy with the results

Mark

 

[vocky]

that's a very decent gain from just the inlet manifold 8)

 

[TimSri]

Hareng - After fitting your new cat, did you have issues with the emissions light cumming on?

 

[markv]

that's a very decent gain from just the inlet manifold 8)

Well it is not only the inlet manifold, it is the combination of the 2bular exhaust with the inlet manifold. Still, it is a huge gain for such a bolt-on change.. If I use the standard way to calculate from wheel power to flywheel power it should be about:

(156 + 10) * 1.10 = 182hp

So that is 35hp gain by these two mods on a NA engine. That is quite rediculous and only possible because the engine was probably designed to be restricted this way...

Mark

 

[vocky]

35 bhp from two mods

that's amazing 8)

but not totally unexpected, gm certainly restricted the z22se and we have found the restrictions

 

[JohnnyN]

that's a very decent gain from just the inlet manifold 8)

Well it is not only the inlet manifold, it is the combination of the 2bular exhaust with the inlet manifold. Still, it is a huge gain for such a bolt-on change.. If I use the standard way to calculate from wheel power to flywheel power it should be about:

(156 + 10) * 1.10 = 182hp

So that is 35hp gain by these two mods on a NA engine. That is quite rediculous and only possible because the engine was probably designed to be restricted this way...

Mark

Mark, have you had any head work done or cams fitted?

 

[Maik]

As I said before, great gains Mark! I'll have to drive your machine in the very near future to feel it showo.. cheers..

 

[JohnnyN]

That power graph is mental! The line is almost vertical from the start!! That's almost like a turbo graph.

Still the characteristic z22se dip in power at around 2500rpm.

 

[vocky]

Mark, have you had any head work done or cams fitted?

I don't think so dunno..

that's the first z22se I've seen smash the 170bhp barrier without cams showo..

I've been telling you to get an exhaust manifold for ages Johnny :roll:

the pair of manifolds would push yours over 200 bhp showo..

 

[JohnnyN]

Bugger! I'm gettin a semi!

 

[vocky]

tms manifold £1k

2.4 inlet manifold £200

£1200 = 200+bhp drool.gif


ps: yes I am trying to wind Johnny up

 

[joey]

Kleenex for Johnny.

 

[Vix]

tms manifold £1k

Does it matter that the TMS manifold is 4-1? I thought 4-2-1 was better for the NA? :?

 

[markv]

Well the bit that the graph is vertical is normal, I mean you have to start pressing the gas pedal at some point in time . So it the just maxes out for that rpm. So it is like 170Nm at 2000rpm? If you have a good turbo car with 2.2 liter displacement it should be WAY higher

Only mods I have done to the engine are:
- BMC CDA airfilter with "rainpipe" air intake
http://www.verboom.net/projects/speedst ... index.html
- 2Bular 2.5" exhaust system (everything except the manifold)
http://www.verboom.net/projects/speedst ... index.html
- 2.4 intake manifold with standard 58mm TB
http://www.verboom.net/projects/speedst ... index.html

I have had the car remapped in early 2005. But the tuner didn't understand the ECU well enough . Right after flashing their maps I took it out for a spin to measure the new power with the accelerometer. I showed VERY decent gains. But after 30 minutes of driving it felt different. Measuring again all the gains had disappeared. Showed that they were not able to turn off the auto learning mode of the ECU .
So basically the ECU has been mapped, but from what I've seen and understood about this ECU it has no effect on my car..

Best thing now would be to get the ECU mapped and the revlimiter raised. Problem is that I don't know of a good ECU tuner for this engine.. Want somebody that can make a good map for this ECU. From what I saw in the brief period that the map did work, significant gains could be had..

Mark

 

[JohnnyN]

I think the 4-2-1 gives a better power band throughout the rev range. The 4-1 gives better power at top end revs.

 

[vocky]

tms manifold £1k

Does it matter that the TMS manifold is 4-1? I thought 4-2-1 was better for the NA? :?

depends :?

I have always prefered the power curve of a 4-2-1 over the 4-1 showo..

but :roll:

the 4-1 bolts straight on, whereas the 4-2-1 needs to be modified to fit (a new 2-1 section has to be made)

 

[vocky]

so that's a 35 bhp increase with the STANDARD cast exhaust manifold

[14 bhp exhaust system + 21 bhp inlet manifold]