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just return from dyno...only 255ps :-(

The math on the KL springs says you get more seat pressure with roughly the same spring rate as a stock Volvo spring. Make sure you have the correct factory seats and retainers for these springs.
 
Swedbrick said:
Hmm interesting I run the heavier ones and haven't ran into this issue yet. The double springs will do more to cancel out the valve float harmonics iirc
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I recently saw someone post on FB with a broken aluminum retainer that looked identical to the KG one. I?m not a fan of aluminum retainers, I've seen them fail too many times. If you?re inspecting the valve train often, and replacing the retainers every few years? you?ll be ok. But long term usage will result in a failure.

And yes, double springs do help reduce spring harmonics vs a standard single spring. Usually just through friction between the coils.
A beehive or conical spring is much better at managing spring harmonics, but looses the spring redundancy (if that?s important to you).
 
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Definitely looks like you have some sort of air restriction. Turbine housing too small makes a lot of sense, given the high boost pressure.

I like beehive springs.
 
I would think so, but I'm not quite a valve spring expert so I'd also defer to someone with more knowledge on the subject.
 
Nikolaos244Turbo said:
Already have ordered Forge adjustable wastegate actuator.Will set boost controller off and will see (fingers crossed)

Want also to replace the valve springs.Due to customs cost is been to much to order from US so I found at KL racing from Sweden. Those "39kg" will be adequate to ipd cam and 1.7bar boost?
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The single 39kg springs from KL Racing will work with that setup, it's a slight upgrade over stock but will work with larger than OEM cams up to high revs ~7500 in my experience.

https://shop.klracing.se/sv/artiklar/enkel-ventilfjader-volvo-8v-39kg.html
https://shop.klracing.se/sv/artiklar/ventilbricka-8v-standard.html
https://shop.klracing.se/sv/artiklar/underlaggsbricka-8v-standard.html

As I mentioned in an earlier post, I think the dual springs are a better value. It's a slight price increase for a lot more performance, and you won't have to worry about a single valve spring breaking and causing issues.
 
culberro said:
I recently saw someone post on FB with a broken aluminum retainer that looked identical to the KG one. I?m not a fan of aluminum retainers, if seen them fail too many times. If you?re inspecting the valve train often, and replacing the retainers every few years? you?ll be ok. But long term usage will result in a failure.
Click to expand...

I believe I saw that post too, but it appeared to be a drift build spending it's life at redline for several years, so I'm unsure if that would be a valid comparison to a street setup. I'll have the head apart somewhere next month, so hopefully it will look okay:roll:
 
Update: Forge wastegate arrived equipted with a blue spring. Need some modifications in order not to interfere with chassis but job done.
Mechanical boost pressure is now 1.4bar all way up to 6.500rpm-before despite the aim of bolst controller,was 1.25
unfortunatelly I had no time to check with boost controller connected but I assume the main problem was the soft wastegate.
Though,I'm planning to replace the valve springs just in case
20221023-170408.jpg
 
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