m42 schrick cams and chip

[B15NAC]

hello
just a quick question i got a m42.I have a evolve chip in the ecu and i have fitted schrick cams yet its only producing 140-145 bhp on the rolling road! is this what you would expect? any advice would be great

thanks neil

[Alex]

Depends how accurate the rolling road is, My iS has been chipped and on the rolling road it produced 152bhp???

Not sure that would of been right like

[jann]

Just abit of topic, but how are those cams? Any good?
Cheers
Jann

[B15NAC]

It makes the car scream to 8000rpm they are great I must admit They really do feel like they make it really racey lol an it only makes it a tad ruff on idle

[emdog16]

that dual mass flywheel is killing a lot of power. Port the head a little, have a free flowing exhaust and intake. You should see about 170 with that setup.

[B15NAC]

yea i got a supersprint exhaust! but it still seems low at 140!!!

[DHFiS]

Did youu have it dynoed before the cams were fitted?

[emdog16]

Bigger fuel injectors could help as well. maybe just needs a tuneup? Try another dyno as well.

[jann]

Didn't only AC cars come with a duel mass flywheel?

[emdog16]

All of the m42's have them. Do an m20 flywheel conversion you will notice a difference.

[B15NAC]

i have a m20 flywheel so may do that mod. yes cook had it dynoed when he owned it an it was 140 so by chipping it and caming it ive got no more power!!

[emdog16]

try a few dyno's they all vary.

[B15NAC]

do they? yea its just odd that at the same dyno it made 140bhp before the chip an cams and now its still 140bhp

[emdog16]

Hmm, how long ago did he dyno it? Go through your drive train check the guibo, change trans fluid, check the LSD (if you have one), make sure stuff isn't loose/ needs replacing. 140 without those things is quite odd to be completely honest with you. Chip, intake, exhaust etc. usually yeilds around 140 to 150.

[Cook318IS]

try a few dyno's they all vary.

So your saying change dynos until you find one that gives you the figures your are looking for?

I got it dynoed at the same place when i owned it, so at least it will give a rough idea on any gains by dynoing it at the same place again.

As i said earlier Neil, i'd change the chip back to the standard one then go from there. But then if it drives better like you say, do the numbers really matter?

[B15NAC]

yea its all well its got all new oil in the diff and gearbox no air leaks all in good condition o and new spark plugs. i think it was 2008 he had it dynoed!

[emdog16]

try a few dyno's they all vary.

So your saying change dynos until you find one that gives you the figures your are looking for?

Nah just try a few and average out the results. But when you are modding it is good to use the same dyno so you can see your gains.

[e301988325i]

Was there a general feeling of low readings? It could be as simple as a poor batch of fuel.

[Cook318IS]

Was there a general feeling of low readings? It could be as simple as a poor batch of fuel.

They were fairly low, but still good. The dyno operator did make a comment that it was sooooo cold (must have easily been in the minus's!) so that it is a possibility that the ecu's could be causing overfuelling

[Brian28]

Neil highly unlikely that you have a dual mass flywheel, never seen one yet on a UK car. The M40 flywheel (that you very likely have) and clutch weighs about the same as M20 flywheel and clutch so nothing to be gained there really. A lightened one would help the engine spin up quicker rather than giving a huge power increase. What was the power at the wheels? All dynos/dyno operators tend to allow a different % for power loss to give the flywheel figure. How were the cams installed? I have read (but no first hand experience) that aftermarket cams like shrick need to be properly timed with dial guages, the standard timing marks can be way out.

[monkey]

Niel i think try the standard chip again chap as the cams worked well in my m42 before they got fitted into yours . also my figures where lower than last time

[appletree]

You can also ally flywheels made for the M50, i'm sure kedge fitted on to his IS before he sold it

[magpie]

a lightened fly wheel will not give any more bhp but it will make what happens happen quicker.

i think my car was 1.7 seconds quicker than another 318is at santa pod both cars were chipped,only mine had a 6.7kg m20 fly wheel

[B15NAC]

Okay thanks guys, I will try the standard chip, and go from there. I have an M20 flywheel so I may get that lightened slightly at some point and whack it in one weekend.
Matt- where do you get yours lightened and can I use an M20 release bearing and starter motor as some people use a 323 release bearing but I don't think you have to.

Cheers,
Neil

[magpie]

you don't need a 323 thrust bearing your pedal will only drop a bit or you can weld a thick slug on the fork prongs to level the pedal out.

i only have a 323 thrust bearing coz i'm spesh

you will need a 6-pot starter or the pinion gear from one on you m42 starter.

it even sounds like a 6-pot on crank over.

[B15NAC]

Okay thankyou how much did you have shaved off your flywheel?

Cheers,
Neil

[magpie]

i think they are 11.7 kg in standard guise but could be wrong!

[B15NAC]

So how much do you think I should take off the standard m20 flywheel? As I believe I've got to shave some off the back to get it to fit without fouling the engine

Cheers,
Neil

[Kedge]

All of the m42's have them. Do an m20 flywheel conversion you will notice a difference.

I've stripped/removed numerus M42s and never seen a dualmass flywheel. All have been M40 flywheels.

You can also ally flywheels made for the M50, i'm sure kedge fitted on to his IS before he sold it

Well remembered there Matt . I had a JBR Ally M50 flywheel on my iS, expensive but transformed the car. Straight bolt on replacement for the old flywheel (same starter ring gear), then a 325 E30 clutch kit was fitted. Current owner fitted a 323 release bearing though when recently changing the clutch.

[DHFiS]

Bigger fuel injectors could help as well.

Would they? There are plenty if 150 bhp M42s using standard injectors.

[B15NAC]

yea i just cant understand that after a evolve chip and schrick cams im getting the same power as before i started and its on the same dyno so i have got no where by fitting these but do cams give you more power? do they just move the power up in the revs?!!!

[DHFiS]

yea i just cant understand that after a evolve chip and schrick cams im getting the same power as before i started and its on the same dyno so i have got no where by fitting these but do cams give you more power? do they just move the power up in the revs?!!!

Where did the cams come from, how much were they and who fitted them? I am surprised there wasnt any technical data with them that provided performance data.

[B15NAC]

I bought them from a chap on here called Monkey. He had them in his M42 for a few years before putting an M50 in his. He bought them off a chap in America I believe, brand new, I have got some technical data books with them. I will have a look through them when I get a chance. I fitted them with my mate and it's all timed up correctly.

Cheers,
Neil

[DHFiS]

Do you think its possible they are standard BMW cams not Scrick?

[B15NAC]

no theyre 100% schrick and it has a rough idle. Really don't understand what it could be!