blu1

As many of you saw my previous thread with new numbers and some severe valvetrain issues up top.

Well I decided to go with PAC 1518 springs, ti retainers, and switching back to the stock rockers. I ended up needing shorter pushrods as well.

Before numbers are with the laboring Patriot duals, yella terra RR's and 7.425 pushrods.
New numbers are the PAC 1518's, comp ti retainers, 7.35 pushrods and stock rockers.



Both are SAE smoothed to 5, the before CF is 1.00 and the after is 0.97. Going to try and get the run files so I can do some more overlaying and see what the car was actually making.

Here is my other thread I was referring too: https://ls1tech.com/forums/dynamomet...er-change.html

Note that with 440rwhp and 400rwtq the car went 7.01@100 in the 1/8th

Sales2@Texas-speed

iTrader: (5)

What camshaft? Not surprising that a heavier rocker and incorrect pushrod length could cause that "laboring", IMO....what test did you do to isolate the three parts changed to see which made the difference? What install height were the Patriot springs at? And the PAC's now?

I don't want to sound like a dick, but the title makes it sound like PAC springs fixed your issues, when in fact you changed at least 3 variables in the valvetrain that each could have contributed to the problem.

blu1

I like how you make yourself sound foolish with your "incorrect pushrod length" crap. That would be making a sponsor bash another sponsor because Tick Performance did the install and measured the lengths, preload, install height and everything else you are trying to blame it on.

Ask Jonathan at Tick if you want all those details to blame the problems on. The fact is the pushrods were ordered to spec of the size needed and the yella terras were shimmed to fit perfect and have the best wipe pattern. Sorry I don't just order the "standard" 7.4 pushrod that "most" vendors send with their cam packages.

He tested the previous springs and they varied in heights as much as an 1/8" standing beside each other and the springs varied from 120-145 lbs on the few that were checked at 1.780" where they were installed. Hows that for putting your argument to rest?

The cam is a 230/236 .613/.609 111+1 xfi lobes. Anything else that you feel the need to defend?

Sales2@Texas-speed

iTrader: (5)

I don't need to defend anything...I don't have a dog in the fight. Just curious how PAC is the hero on the deal when there were at least parts changed? We deal with Tick all the time and they are great guys to deal with. Did they spec your old valvetrain setup and install it? I'm not blaming anything on anybody, just hoping people reading here don't think that somehow the PAC springs were the end all be all fix for your issues, when they weren't necessarily. The fact is, it could have been the pushrod length, rockers, AND/OR springs.

Why so defensive about simple questions?

blu1

Yes they installed it, measured lengths, tuned it and everything else. Patrick G spec'd the cam. Jonathan wouldn't install something that wasn't measured and correct lengths, install height, etc etc.

The reason I say it was the springs because of the tests done with the springs. If the springs tested ok I would have kept them and saved my money but they fact is they were bad, really bad. I had planned to put the YT's back on but I just wanted to get the car back and enjoy it. If you think I could have gotten the same results with the Patriot springs by just switching the rockers and pushrods then somethings wrong!

Why so defensive? Because you jumped in here and started blaming it on improper setup when you didn't know anything about it.

If I blamed it on something that hadn't been tested then assumptions could be made but thats not the case here.

blu1

And I know its a quick swap to switch out the RR's but my car needed to get off the dyno for the swap and it would have been another day or so before the tests could get done. I was too anxious to drive the car since its so nice out.

Sales2@Texas-speed

iTrader: (5)

Just to clarify my original post because it seems you didn't read it fully...it says COULD have caused the issues. I asked questions and was not placing blame.

blu1

My bad for misinterpreting what you said.

Sales2@Texas-speed

iTrader: (5)

No worries. I know what "camp" you hang with when not on LS1tech, and I really wasn't attacking you for it. Purely curious with no alternative agenda here!

Patrick G

iTrader: (14)

The shorter pushrod makes sense if you went from a Yella Terra to a stock rocker. The YT rockers typically give the best wipe pattern with a .050" shim (which the stock rockers don't need). What plunger depth (pre-load) did you choose for the lifters? With a 7.350" pushrod, I would assume your pre-load is shallower than stock.

blu1

That would be a question for Jonathan at Tick. There is a reason I pay for someone else to do this stuff haha.

blu1

I don't really have a "camp" I'm everywhere. I also run your head and have been going pretty quick/fast with it. Do I think I have a good chuck to gain with a newer/better casting yes, am I going to swap? Nope not until the cubes go up.

Sales2@Texas-speed

iTrader: (5)

Cool, glad to hear. Best of luck!

ScreaminRedZ

iTrader: (3)

Nice improvement.

FASST LN

iTrader: (5)

Wow! That is great!
I'm amazed how similar our graphs are considering the variation in our heads and cam choices/specs.

It looks like the slight dip at 4,000 rpm might be related to the Air/Fuel mixture getting a bit lean? I noticed the A/F ratio drops at that point and mirrors the power output step for step. I'm surprised Alvin wasn't able to tune that out? Must be something more happening there.

I didn't remember you're cam was a 111 LSA. That thing must cam pretty hard! Can't wait to hear it one day.

What tires are you running with this setup?
Congrats!

blu1

The actual dip from 3600-4000 is from it running rich, not sure why it didn't get tuned out but other than that the car is running great. Idling at 875ish and pretty mild street manors for the setup.

94 guy

iTrader: (125)

what lifters are you using and what preload are you running?

blu1

they are comp 850-16's and the other specs I don't know, Tick installed everything.

Phil99vette

iTrader: (11)

Has anyone compared the weight difference between the stock rockers and the YTs?

blu1

I'll see if I can get that info today, the YT's are off and I know they have some stock rockers sitting around.