2116 replies to this topic

[oakmere]

Which brand/type did you use? I have Schrick camshafts and valve springs. I was not going to bother with camshafts but I got them at very good price. OBD software works fine with the cams but I am trying to achieve a flat idle. Every z22se engine with camshafts fitted has lumpy idle.

[NickB787]

With the comp cams they can have poor idle due to bad position of the fixed gears they need to be adjustable to get them half decent

[Mike (Cliffie)]

Which brand/type did you use?

I have Schrick camshafts and valve springs. I was not going to bother with camshafts but I got them at very good price.

OBD software works fine with the cams but I am trying to achieve a flat idle. Every z22se engine with camshafts fitted has lumpy idle.

I have Comp Blower cams. No amount of mapping will give OE idle on high lift cams though.

[techieboy]

That blown up engine is really getting into your head huh.

Not so much killing the engine. That's kind of almost acceptable given the number of trackdays I'd done and the abuse it was given. It would certainly have been nicer for it to have happened to the OEM engine, before it had had all the forged bits fitted though.

It's more the whole Z22SE engine I don't like. The strained revability of an over-square engine (even with no balancers and lightweight fly, it still doesn't feel/sound like it likes it), the piston slap thing, the oversized bores with increased oil usage (and probably weakened liners as a result ), the lumpy blower cams, the bodged PCV setup, the too safe fuelling and lack of proper IAT monitoring and the ecu actually being able to deal with that.

Hence wanting to go to an OEM engine that's a bit stronger out of the box and hopefully retaining OEM reliability. No idea whether things like the piston oil jets really help (can't see them hurting though) but having stock bores, forged crankshaft, square dimensions, proper LSJ supercharger cams, etc, will hopefully make it a nicer engine all round. An extra 1.5 litres of oil in the sump probably isn't a bad thing (as long as it doesn't mean the crank drags through it on sustained high G cornering). Might even be nice to use the standard LSJ cam driven vacuum pump to keep the brake servo nicely topped up, whatever the throttle is doing. I'll probably give away some torque and peak bhp by losing the 200-300cc difference in capacity but I can live with that, as I thought the car was better balanced at 260bhp and a nicer drive than it is with 300bhp anyway. Sh!t, I've almost talked myself into going in to the garage again.

[smiley]

I think you will love the characteristics of a 2.0 lsj or saab techie. I know i did on a short demo.

[oakmere]

Cliffie The frustrating part is I have almost got it with the Schrick cams. I agree the wilder the cams get the lower the chance of getting good idle.

[Mike (Cliffie)]

Cliffie

The frustrating part is I have almost got it with the Schrick cams. I agree the wilder the cams get the lower the chance of getting good idle.

But then if we all chased perfection, none of us would have bought a VX220.

[techieboy]

I think you will love the characteristics of a 2.0 lsj or saab techie.
I know i did on a short demo.

I really hope so. Last chance saloon for the car, this time. I really do need to enjoy driving it again and if I don't like it after this, it's probably a case of scrounging up a vanilla Z22SE and getting rid, I think.

[oakmere]

Cliffie

The frustrating part is I have almost got it with the Schrick cams. I agree the wilder the cams get the lower the chance of getting good idle.

But then if we all chased perfection, none of us would have bought a VX220.

True

[ultimate]

for my understanding:

we're talking about the red marked in the picture when talking about "PCV"? Is that correct?



In the intake manifold is a valve that opens under negative pressure so gases can pass through at low throttle. This valve closes under boost so no boost can pump up crankcase.

This hole was closed (Z22SE head-hole and valve in the manifold are not in the right position together) at my first hitec conversion.

Since running the B207 engine the position is right. So the system works.

I sended Peter a mail about that... Or perhaps he answers here.

Edited by ultimate, 19 April 2013 - 04:51 PM.

[PaulCP]

Just been trying to read/take in today's posts Fcuk my head hurts ! Just un-sorned the car today and it can stay as it is. - no more messing with it

Edited by PaulCP, 19 April 2013 - 06:02 PM.

[Kieran McC]

Just been trying to read/take in today's posts


Fcuk my head hurts !

Just un-sorned the car today and it can stay as it is. - no more messing with it

I dont believe that Paul

[PaulCP]

Just been trying to read/take in today's posts


Fcuk my head hurts !

Just un-sorned the car today and it can stay as it is. - no more messing with it

I dont believe that Paul :happy:/>

You're right, I'll need to get the oil changed

[CocoPops]

And didn't james deliver some parts to you recently Paul?

[rik]

I have Comp Blower cams. No amount of mapping will give OE idle on high lift cams though.

blower are idling ok here

[oakmere]

Rik What idle advance are you running? Take a look at Chris's thread on the project page (2 vids) how much better is yours?

[ultimate]

I talked to Peter. No need to close PCV with OBD-Tuner. My B207 has a working PCV System and mapping was no problem. I am using catcam "fast road turbo" cams in my b207(light flywheel and balancers deleted) and idling is not very good. My ignition is programmed to 6 degrees when idling. I noticed that idling becomes better with setting little more ignition. But i love that lumpy idle so i did no more test with that. It remembers me to my good old times 10 years ago when i was driving cars from the 70's and early 80's with tuned N/A engines and very heavy cams ;-)

[ultimate]

Idling in the upper video is set to 900. In the following video you can hear the engine at 1300 rpms and cold start. Cold start idling at the higher rpms is okay. ignore the chap at the end of the video ;-) it was one of the first starts with the new engine after installing it. So i was very happy that it runs and reacts to throttle ;-)

Edited by ultimate, 19 April 2013 - 11:00 PM.

[oakmere]

Sounds nice! It is a great feeling when it starts for the first time and everything works.

[CHILL Gone DUTCH]

I've been mapping today, Lower revs up to 4k isn't a problem But there seems something very wrong with reving high with low acceleration (load) I'm not finding it easy to get the boxes green but they have gone grey