1497 replies to this topic

[Nev]

Its good to hear you are up and running Nick. I'm looking forward to seeing a dyno plot on that beastie.

Yea, me too. I saw Nicks car sitting at Courtenays 8 weeks ago when I dropped my own car off and had a snoop round. I am a little surprised to hear that just a couple of degrees on the cams caused so much problem with the mapping TBH, but maybe the Z22 is unusualy fickle about such things. Even if you stick vernier wheels on your cams, its really hard to line them up with more accuracy than +/- 1 degree either way anyway.

[MAXR]

Nick, Glad you're finally getting there...just the matter of the mapping now & we're all waiting to find out what she makes on the dyno! ...in the meantime, I'll just sit back an wait for all the problems to be resolved, then I'll make a decision on the Harrop. Mind you, I'm happy with mine now. I'm sure your car will be mental on track...So, make sure you pack baby wipes!

[FLD]

I feel a harrop GB coming on!

[Exmantaa]

I sent them the Saab cam gears, same as oem but no positioning lugs on them, so they needed to adjust them manually. sounded a bit of a pain to do, but they did it. It does sound like all my hassle right back to the start of this episode may have been due to the comp cams not having the lug in the correct position. (worth 3 IMHO)

Finally some good news, so awaiting dyno results next.

(The whole cam degreeing procedure on a GM Ecotec engine is very well described in the GM LSJ build book. Did not look to difficult to me, if you have 2 dial micrometers and a degree wheel. Do you know how much your Comp cams were out? )

[FLD]

Even if you stick vernier wheels on your cams, its really hard to line them up with more accuracy than +/- 1 degree either way anyway.

Yeah, aint it just!! The way I found around this was to drill the cam / sprocket and use offset alignment dowels. If its a keyway you can use offset drive keys to similar effect. I find this more reliable but more time consuming than using a vernier wheel.

[alanoo]

Yep, thing is, to do it perfectly you need to replace the hydraulic tensioner for a mechanical one and fit a pair of solid lifters if possible

[NickB787]

Even if you stick vernier wheels on your cams, its really hard to line them up with more accuracy than +/- 1 degree either way anyway.

Yeah, aint it just!! The way I found around this was to drill the cam / sprocket and use offset alignment dowels. If its a keyway you can use offset drive keys to similar effect. I find this more reliable but more time consuming than using a vernier wheel.

Amazing that such a small error can cause so much trouble probably doesn't matter too much on an oem setup but any modding to big power seems to make such a difference.
Would also explain why there is such a difference in the running of cars with comp cams some seem very smooth others not so.

think people better start buying some oem lsj cams

[Mike (Cliffie)]

Piper has always been able to supply cams for the Z22SE and have a really keen profile that I have in mine. I can't honestly say whether they would cause issues further up the power range, all I can state as fact is they produced 268 BHP on a stage 2 with standard internals and pulley on the M62.

[Muncher]

Mine produced 266.5bhp at Courtenays on a standard engine and pulleys.

[Exmantaa]

"think people better start buying some oem lsj cams" LSJ cam profile is identical to the 2,2 L61 engine (=Z22SE), only timed differently...

[NickB787]

"think people better start buying some oem lsj cams"

LSJ cam profile is identical to the 2,2 L61 engine (=Z22SE), only timed differently...

I thought the lsj with the s/c as standard had different cams, just that the americans get much better bhp than us with the harrop bolted on to the lsj. if the cams are the same they should have topped out at about 320bhp which is where I did regardless of what pulley was fitted,

[Exmantaa]

As said, the LSJ cams are timed differently. (intake 16*, exhaust cam 8* difference) The US guys can probably tune a bit more aggressive (timing advance) with their ecu. Not sure how much knock "fail safe" Courtenay keeps with the Z22SE mappings. (No IAT measurement...) And don't know how the US WHP dyno's compare with our BHP measurements. Some say the numbers are quite close...

Edited by Exmantaa, 02 August 2011 - 09:49 PM.

[Muncher]

I think I have all the bits I need now, other than the loom. Porsche Throttle Body TB to SC Adapter Plate VXT ECU VXT Immobiliser Code Programming Z22YH Coil Pack Z20LET knock Sensor Z20LET coolant sensor 90541937 VXR AMM Z20LET Map Sensor (uses a Bosch TMAP sensor (0261230042)) I've seen an atmospheric sensor is also mentioned, any idea of a part number for that?

[Nev]

Any more progress Nick ?

[NickB787]

Jon will be back tomorrow so I will call him then

[Muncher]

Has anyone posted a guide detailing how the looms need to be modified?

[NickB787]

not as such. Vocky sorted the loom I am using, might be something around here or the z22se site. sorry can't help sim time again when over( passed) will search

[FLD]

From what I was told its just a case of making sure the plugs are moved tio the right positions from VXT to 2.2. No big deal so no guide needed really.

[Muncher]

Ooh, that would be handy. Is any wiring change required for the Porsche TB?

[leevx2.2]

Ooh, that would be handy. Is any wiring change required for the Porsche TB?

No plugs straight on TB