Hahn Super 20g - Overall Impression

[Jaysmith2000]

Originally Posted by Neo-Sky

You should get some vids. Im thinking of going with the s20g on my cobalt.

When I get it back in (have to replace a gasket), I'll video the dyno on it. Jeb has videos out there though if you want to check them out....just do a Hahn 20G search on YouTube.

Originally Posted by wspohn

What does Bill say the power should be on the Kappa doing what you have done, and do you/he think it is safe without upgrading the bottom end? Looks like a nice unit.

I think someone already responded, but up around 400hp without a problem. Jeb I believe is pushing 500hp with this and his custom tune and E85, but he can talk to that. I was looking for something near 400hp. It pulls like crazy.

Originally Posted by Elff

I am not sure if it was due to tuning or just sheer power,
but Jeb and Tony@ASAP are on their second engines due to this turbo.

You will want it tuned well and have the power limited if running on stock internals
This turbo is strong and can break the LNF.

Tony used to live just down the street from me and did my transformer steering wheel logo....I thought he had the 2.4 Solstice not the GXP? In fact, I was pretty sure?

One of the reasons I settled on the Wester's tune is I have had excellent luck with Lyndon in the past as far as tuning goes (not to say anything negative about Trifecta, that is great as well). However, with Wester's tune I feel confident the car is safe/strong with my current setup. If nothing else I'll be yelling "yippee" when the engine blows.

[Neo-Sky]

Originally Posted by Monadzback

Why would a quick spool hurt internals with a proper Tune?

I've talked to a few tuners and they said it put more stress on the rods and pistons. Maybe they're just bad tuners? lol

[Monadzback]

I don't know enough about it to argue, however I would disagree.

[Monadzback]

Let's say you have 2 turbos. both of them eventually make the same amount of boost however 1 comes in 2000 rpm sooner and therefore hits harder. do you take the slower spooling turbo to save your rods based on what that that tuner said? it doesn't make sense to me that a faster spooling turbo causes engine failures sooner

[miller11386]

This discussion makes me lol

[Neo-Sky]

Originally Posted by Monadzback

I don't know enough about it to argue, however I would disagree.

I honestly don't know either but thats what they said. Not my tuner but just some friends. I could see the tranny not holding as well on fast spooling turbo.

[|V3nom|]

gmtech has talked about this before. he likes a faster spooling turbo, not a sooner spooling turbo. making too much boost too soon on the little 4 banger isnt good, its physically not strong enough to take it until it gets in the higher rpms. i think 3000+ is good on the lnf, not 100% positive on that though.

[Nova-Exarch]

Seems like it may be an interpretation/viewpoint problem here...

I THINK what they may have meant was that too STEEP of a curve = bad on the engine. Not the same as where the curve is located in relation to the RPMs.

I took like 2 min to put these together :P dont bash the technicalities...

I think what the tuners were telling him was that if you had a faster spooling turbo (faster than stock) then you could be okay with the curve I colored green but possibly not okay with the curve I colored red.

The green curve is putting X amount of stress beyond what the engine was designed for where the red curve is 2X the amount of extra stress.



Doesn't really apply to the 20g since its a slightly slower spool so it'd look more like this and actually be more gentle on the engine early on:

[lllfly]

Very nice clean install .
LLLFLY