ge_forcez22

iTrader: (3)

well just got back from the dyno, pretty dissappointing as the car would make power after 5400rpm. Kinda stumped on the issue, thinking either plug gap or valve springs. plugs are tr7's at 0.032" and springs are the ones that come with the ETP 225cc heads, bought used unsure of milage or use. Running with a TC-78 turbo and an AES 390ci.

So any one with some serious experience please chime in, thanks

-Garrett

http://www.youtube.com/watch?v=RpoPitBsZY0



http://www.hptuners.com/forum/showth...020#post263020

XtraCajunSS

iTrader: (2)

Well, if they are ETP heads, they definitely have some age on them... What cam are you using and what rockers are you using?

Shane

Patrick G

iTrader: (14)

+1. Your cam choice and spring choice will speak volumes here.

ge_forcez22

iTrader: (3)

magnesum rockers ls1 rockers (orange in color)
springs are the double spring that came with the head
cam is an MT1 boost cam, .560 .560 224/224 144lsa.


it litterally sputters and dies at 5400.

itsslow98

iTrader: (18)

My guess is ignition problem, possibly blowing the spark out. You may want to pull a valvespringspring or two and have them tested to make sure they arent bad as well since its unknown mileage.

ge_forcez22

iTrader: (3)

which plugs do you think I should run? I am running TR7's now

itsslow98

iTrader: (18)

Im not an expert by any means lol, just an assumption based on the research and reading that ive done since ive been wanting to turbo my ls1 mustang.Someone with more knowledge may be able to lead you in the right direction.

Nitroused383

iTrader: (10)

Not sure if that is your AFR on the bottom of the graph, but if it is I would regap your plugs to .026". Lean spikes in your AFR are a misfire, same issue I had and it ended being my stock ls1 coils were junk! Just a heads up too, that TC76 is going to choke out huge on that setup, way too small of a turbine wheel for those cubes. This will cause excessive back pressure and exhaust valve float. Good luck!

Patrick G

iTrader: (14)

Sounds like Harland Sharp rockers which are HEAVY. Couple this with ETP 225 valves which are HEAVY and you most likely have too much valvetrain weight for the boost and valvesprings you're running. With just .560 lift, I'd replace the rockers with stock LS1 units and add some PRC .675" EHT dual springs. Problem solved.

djjonesivs

iTrader: (2)

Don't want to sound like a echo.

But
Really double check the springs in those heads

Some etp heads came with crane dual springs which were a 1.460 dia spring that had only 130# on the seat.

Basically spring pressure of a stock ls2 spring.

These heads work fine with stock rockers no need for roller tipped units.

A set of patriot dual springs will work fine I'm those heads
You just need the larger diameter spring bases for bronze guides.

You also would need to absolutely check the installed heights of these springs.
Also .80 wall 5/16 pushrods should not be used with these heads.
Get thicker dia pushrods.



Check out my graph with etp heads.

XtraCajunSS

iTrader: (2)

Again, another echo, Patrick is right on the mark...

Harland Sharps WILL NOT WORK. Also, ETP's heavy valves won't work with the lobes on that cam or the Harland Sharp rockers. It's going to be near impossible to make this combo work with that cam N/A not to mention throwing a few pounds of boost on the back of those large HEAVY intake valves...

I have used ETP, PI, and now MAST heads for years. I've used them in almost every configuration you could think of. Valvetrain setup on these is ultra important due to the huge changes in valve weight and valvetrain geometry. I've worked with Cary and Craig, who've designed and built those heads from the beginning, to solve these problems. You will need a MUCH more mordern and stable lobe design and springs with much more pressure and better harmonics than any Patriot or other bargain spring will provide.

If you'd like to have this issue taken care of, give me a call or shoot me a PM, I have a set of these heads on a 88mm turbo'd 6.0L in a car running 5.40's in the 1/8th mile with no valvetrain issues.

Thanks,
Shane

AES Racing

iTrader: (6)

Most people had issues with those Crane springs.

Need 200lbs seat/500open for your application Garrett.

ge_forcez22

iTrader: (3)

Thanks Fraser. Thanks everyone else, I just ordered some badass springs!

LS6

things to learn

AES Racing

iTrader: (6)

Any update?

ge_forcez22

iTrader: (3)

I will be bringing it to the track tomorrow night for the first time with the springs, slicks, more boost and the cage... if I can finish welding it in tonight. I drove it once and it felt perfect, so a log down the strip will tell the story. I will update you, thanks again Fraser!

-Garrett

BLINGOLE

iTrader: (5)

holy crap dude i read this tread a few days ago but dam i just noticed you have a 390 with a tc78!!!! Dude your back pressures threw the roof!! thats why it falls on its face! man with 370's at 13lbs its way to much on a tc78! let alone a 390



I cant believe no one has said this!

BLINGOLE

iTrader: (5)

man and with good heads and a good cam! that things probaly 50lbs of pressure in the hotside


Did you just add the note of the tc78? i read this tread before and i wouldnt of missed that i think

BLINGOLE

iTrader: (5)

man with a real turbo your pickup 200 horse easy..

hellbents10

iTrader: (10)

No matter what is done to the valve train that turbo is still to small on the turbine side, and is going to compound your problems.