[lemans411]

no signs of detonation . actually running pretty fat. on e85. plus its intercooled . sd perf e heads 330 cfm " race port "

[Travis Q]

Hmm. Not sure. The Cometic stuff I've messed with usually sets in one retorque. How thin are the heads around those studs?

[lemans411]

you thinking the heads are crushing? stupid cars. sorry for the hijack.

[NHRASuperStock455SD]

Originally Posted by cgeise

Twin "hybrid" 88s and be carefull with the oil -- with it so high it really loads the drive components -- and if you have Ball Bearing turbos - -they dont like it and as was stated befor - 280 on the seat becomes 200 on the seat at 20lb of boost - just saying

Should we put a pressure relief valve in the oil line? What is the issue with high oil pressure? I think Tony wants this thing to be bullet(billet) 2500HP proof!

[NHRASuperStock455SD]

Originally Posted by lemans411

i have a 535 pontiac with cometics and arp studs. i have had issues with the heads lifting when i get around 20 psi of boost. when i check the studs they are loose... i have retorqued the heads many times and it seems the center stud that runs through the center 2 exhaust ports is always the loosest . followed by the outer bolts that run through the outer exhaust ports.... i guess im trying to figure out if they are just stretching or working their way loose . i torqued them right before the last race i went to and it seemed ok but really how many times do i need to retorque em before they stay? i assume your motor is dry decked? maybe i should o ring it and be done ... id be thrilled if i could get 25- 30 psi out of mine id be running 8's in a 4100lb car weeee!!!!!!!!

I believe that the biggest issue with your engine is probably heat. I am hoping with our improved water jackets and no siameze water jacket it helps with the sealing. All I know is his traction control better be hooked up.

[NHRASuperStock455SD]

Anyone have the torque numbers for NA on these engines? I would say that is a better number since these engines dont have the compression or the header sizes to represent true horsepower?

I am thinking this dude is going to make big torque N/A.

[cgeise]

Originally Posted by NHRASuperStock455SD

Should we put a pressure relief valve in the oil line? What is the issue with high oil pressure? I think Tony wants this thing to be bullet(billet) 2500HP proof!

It is my understanding that with BB turbos you need a restrictor in the oil feed -- best talk to manufacture on that one --

[cgeise]

Originally Posted by NHRASuperStock455SD

Should we put a pressure relief valve in the oil line? What is the issue with high oil pressure? I think Tony wants this thing to be bullet(billet) 2500HP proof!

It is my understanding that with BB turbos you need a restrictor in the oil feed -- best talk to manufacture on that one -- My BB stuff didnt last for **** -- just an FYI

[RAIV-Z]

Originally Posted by cgeise

It is my understanding that with BB turbos you need a restrictor in the oil feed -- best talk to manufacture on that one --

We’ll give Turbonetics a call and see what they recommend.
Are you running inline filters on your turbos? Which brand?

[cgeise]

Nope - I live on the wild side - lol, although I dont remember if there are screens in the inlet or not

[RAIV-Z]

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[twov8sandat4]

Ball-bearing turbos do not need as much oil pressure to lube the bearings as standard journal bearing turbos. Turbo manufacturer should have a recommendation of what to use for feed line (including filters and/or restrictors.)

Question for Travis. What do you use for boost control?

[cgeise]

at 44lb of boost - I dont think he is controlling it -- lol

[tjwelter]

That looks wicked. Are those Moran / 500 lbs ?

[Travis Q]

We run Turbonetics 91mm BB Thumpers, and have never had an issue. We also run over 100 lbs of oil pressure, we use Royal Purple Nitro 50 engine oil. It is the cat's meow, for sure! Our oil inlet lines are unrestricted -4AN. Never an oiling problem, no turbo problems at all.

We use the boost control that's built into the XFI system, it works great. And yes Curt, I do control boost. A little bit. LOL!! In all honesty, I think we can make close to 50 pounds with these units, then we're going to run out. We leave with a lot, and try to make boost as quickly as we can, and use clutch, gear ratio, timing, and fuel to control power. With an engine that's only 480 inches with two big turbine wheels, we have learned that you are fooling yourself trying to control boost as a means of controlling power. We have to make boost quick and keep it there. Otherwise, the engine "falls off the turbo", and it's hard to get it to recover. If the engine were larger, or we had smaller turbine wheels like a GT55, we could probably utilize boost control a little more.

[RAIV-Z]

Originally Posted by tjwelter

That looks wicked. Are those Moran / 500 lbs ?

Thanks, they are Moran 235lb injectors.

[RAIV-Z]

660HP@5800RPM
675TQ@4800RPM

535cid
9.15-1 Compression
Camshaft [email protected] .701 gross lift, 115 Lobe Separation.

[shaker455]

Any more info like carb used, jetting, timming & curve?

[Travis Q]

Bolt the turbos on, spool that big gun up and let her eat!!

[cgeise]

Originally Posted by Travis Q

We run Turbonetics 91mm BB Thumpers, and have never had an issue. We also run over 100 lbs of oil pressure, we use Royal Purple Nitro 50 engine oil. It is the cat's meow, for sure! Our oil inlet lines are unrestricted -4AN. Never an oiling problem, no turbo problems at all.

We use the boost control that's built into the XFI system, it works great. And yes Curt, I do control boost. A little bit. LOL!! In all honesty, I think we can make close to 50 pounds with these units, then we're going to run out. We leave with a lot, and try to make boost as quickly as we can, and use clutch, gear ratio, timing, and fuel to control power. With an engine that's only 480 inches with two big turbine wheels, we have learned that you are fooling yourself trying to control boost as a means of controlling power. We have to make boost quick and keep it there. Otherwise, the engine "falls off the turbo", and it's hard to get it to recover. If the engine were larger, or we had smaller turbine wheels like a GT55, we could probably utilize boost control a little more.

On the flip side -- I do use gt55 turbine wheels on my 88s and control it with an AMS 1000 -- PROB APPLES AND ORANGES with an auto vs a stick . I dont know if the extra 45 ci makes a lot of difference? And its to damn much work swapping convertors - so we control boost a lot