RW99

Is there a downside to going with the Gold Extreme dual springs on a boosted application?

I have a mild cam 224/224/114 0.588, but there's a possibility that I'm getting some high rpm float at higher boost settings... once I go past 10 psi or so (T67 front mount, 346 ci) I get fluctuating power at upper rpm.

Stock springs: open pressure 310 lb., closing pressure 110 lb.
Gold duals: open pressure 380 lb., closing pressure 135 lb.
Gold Extreme duals: open pressure 410 lb., closing pressure 155 lb.

Thanks for any advice...

99Z28LS1

iTrader: (4)

my patriots duals work just fine and i make a ton less power. i imagine they would hold just fine for you

Country Boy

iTrader: (24)

The gold extremes may need an aftermarket lifter like the Comp Rs. I had the golds with 12 psi and even seen 16 once and they worked fine.

RW99

...looking for somebody that's used the Extremes...

Wnts2Go10O

iTrader: (12)

you CAN have too much spring pressure. just get the reg golds=)

lt1_fool

You have a 224 cam with < .600 lift. The golds are more than enough.

A buddy ran the plain ol' golds on his 242/244 cam / ported heads / stock cube ls1. No valve float at all. He had some cheaper springs when he ran a TR224, and didn't get valve float either. Extremes would be overkill for your little cam.

Country Boy

iTrader: (24)

Awww come on, bigger is better!

black98ws6ta

iTrader: (77)

Ive read some posts about a cadillac lifter, any details on those?

Wnts2Go10O

iTrader: (12)

eh, if its one thing ive learned on good ole tech... its that bigger isnt better

RW99

Is that still true if I push past 15 psi on the T67, or maybe go up to a T76 and run 10 psi or so?

camarols1

iTrader: (17)

RW99
It depends alot on the boost level,rpm you are trying turn,
and the intended HP.
Big HP builds often run much higher spring pressures by shimming
the springs until you get .050 away from coil bind.

The Caddy lifters are a good idea if you are spinning it over 6,500rpm.
They have a ceramic internal check ball that is reported to be more stable at
high RPM as well as providing a quieter idle.

I will be shooting for around 200lbs on the seat to help control the
heavy intake valve on my L92 setup. My cam will be 236/240 though.
I think that your setup would be fine with the regular Gold's.
Just because I plan on spinning 7,200 does not mean that you want
or need to.
You are paying for the build, so use whatever parts needed to
reach your goals for the car.
Good luck with the build!

qqwqeqwrqwqtq

I would run the gold extremes or better. It's not that you're at a higher boost level, the problem is that you're at a much higher backpressure level which the exhaust valve has to overcome in order to close controllably and not bounce on the seat. This will show earlier on a smaller turbo like you're running as backpressure is higher at any given boost level compared to a larger turbo.

Also, we have run 200lbs on the seat with comp stock replacement lifters at 20+psi boost, 1100+rwhp and 7,500+rpm's with no issues to date.

camarols1

iTrader: (17)

+1
Did not catch the rather small single turbo being used.
Good post.

RW99

Maybe another way to phrase the question:

Does anyone predict any sort of problems if I go with the Extremes on a forged 346, AFR225's, 224/224/114/0.588 cam, pushing 11 psi from a T67, not revving past 6500?

Would better lifters (over what came with the AFR's) be required?

Thanks for all of your help.

L"SS"1

iTrader: (14)

I dont predict any problems. I am running a 244/248 612 lift cam on 6lbs of boost and have had no problems at all on patriot golds. These springs imo are the best bag for the buck.

stevewix

I had mega huge valvetrain issues in the chevelle for a long time, cadillac lifters and extreme valvesprings fixed ALL of it.

I drove it a lot with the stock rocker arms, but it is a good investment to use a non-adjustable roller-tipped rocker arm! (Harland Sharp)

ninetres

iTrader: (35)

Here is my set-up:

patriot xtreme springs,
24x/23x 64x--61x cam
stock rockers and tsp chromoly push rods
7k rpms
364ci
20 psi T76

Should be running in a few weeks (been saying that for a month now, lol)

blown69nova

I am currently running a Comp 224/236 .573/.593 116lsa cam (1.52 ratio) in my gen 1 sbc and TFS heads with their springs. 125 seat, 36x open (18-20psi boost). I can't rpm past 54-5600. I thought I was running out of fuel because of my afr's going from 10.5 to 14+! I did not burn plugs,pistons or blow head gaskets despite leaning out on top.
I'm hoping this is also a spring issue. What do you guys think?
Steve

RW99

Just an update on this to add info:

Went with the Patriot Golds instead of the Extremes. Top end is now happier (red curves):



The boost curve is now flat as Nebraska. Surprisingly, it looks like it spools a little better, too... but all of this is after a retune. I think the comparison is legit, though, because the tuner worked real hard to get the previous (blue) results.

Worth the $$, I'm happy.

camarols1

iTrader: (17)

Congrats! It looks like the Golds were enough to fix your problems.
It's good to see they worked out for you.
I went with the Extreme Duals from Speed Inc. per their advise,
but I have a much more aggressive setup.
They are a great bang for the buck, and the kit is matched and ready to go.