Need help with Schrick camshafts 264/256

[redlinealley]

I want to install these cams into my S52. But do I need to replace the valve springs? Motor has 105,000 miles on it and I don't plan on tracking the car. Just looking for some more power and I'm not spending 5K+ on a supercharger. From what I searched out, these camshafts are a drop in with no modifications. If I have to replace the springs I'll probably not do the upgrade.

[Ateyourv8]

You dont "need" to replace them, but i would with a reputable aftermarket brand for a piece of mind while the cams are out.
Although you will need a spring compressor and will have to pressurize the cylinder to avoid the valves dropping. Its fairly simple with the right tools.

[bluptgm3]

Not required, stock springs work. New BMW or INA (OE supplier) lifters is a good idea.

VAC sells a set of stock valve springs rated 10 percent over stock pressure.
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[redlinealley]

I was looking at new INA lifters, are stock lifters ok?

[bluptgm3]

Yes, INA is OE supplier of lifters for S52 (M/S5X)


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[redlinealley]

Awesome because there only 13-14.00 each.

[JustinHalverson]

I have a a couple of more basic questions, "How much of a performance increase do you expect from these cams?" "Is there DME programming required to obtain additional performance with the cams?"

[bluptgm3]

3.5 inch MAF (Euro, 540, Bosch 803, Bosch 809 depending on software), larger fuel injectors, S50 intake manifold (and headers) plus software (shark injector is one choice) for best results.


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[Mr Bingley]

I have a a couple of more basic questions, "How much of a performance increase do you expect from these cams?" "Is there DME programming required to obtain additional performance with the cams?"

3.5 inch MAF (Euro, 540, Bosch 803, Bosch 809 depending on software), larger fuel injectors, S50 intake manifold (and headers) plus software (shark injector is one choice) for best results.

Accurate response better left unsaid. Have fun with it and don't look too deeply into the numbers.

[redlinealley]

I have the M50 intake, aftermarket headers and supersprint exhaust. After I install the cams my tuner will tune the car. As of right now he doesn't think 3.5" MAF and 24lb injectors will be needed. If I was going with a Supercharger, then the 3.5" MAF and bigger injectors would be needed. 20-30 HP gain

[328 Power 04]

Bigger MAF is needed, as most S52 will reach the stock MAF maximums with just M50 manifold (which contributes greatly to the poor gains of M50 used alone). In this case, when it reaches signal maximum, the car estimates fueling poorly and car runs rich. This is after 2+ years of tuning on these.

Larger injectors are not necessary. The stock pinktops still have enough capacity to them.

3.5" MAF and larger injectors are not a matched item.

[rf900rkw]

It's not so much that it needs a bigger MAF as it needs a rescaled MAF table. Many supercharged cars are running the stock MAF with nothing more than an inline resistor.

[328 Power 04]

Correct. The tube size is not the restriction, it's the measuring capacity. Stock is 725kg/h at 5V.
A resistor still needs a retune of the MAF scaling, similar to changing the MAF type.

[Mr Bingley]

Supercharged here with stock MAF, resistor, and tune. No need for a bigger MAF. I did, however, go with a BBTB, and that made a noticeable difference. So did rebuilding the VANOS, btw and fwiw. (o k, I'm having a little fun with acronyms and initialisms).

[bluptgm3]

VaNos.....


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[redlinealley]

I rebuilt the Vanos last year

[Remotion]

I tuned M52 and with mixed Schrick / S52 cams and I needed bigger injectors and scaled maf/maf-table. Ofcourse it breaths very well.