SD99TA214

iTrader: (27)

Its a f-11 , Futral motorsports, 228/230 576/595 112+4
I know its not ideal but could i really be losing alot of power from it?

Update, same setup but now its a 6.0, same problem

TTI .70 a/r on the compressor side with a 70mm inlet.
.96 0n the exaust. 3 inch down pipe to 4 inch over axle through straight through 4 inch magnaflows. ported (cleaned up) 317's patriot gold's (new) hardend pushrods stock rockers , Lq4 shortblock (iron 6.0) stock ls1 intake front mount intercooler, 3inc in and out, 90 degree IAT temps.

2 bar SD tune openloop. hptuners perfect afr, 12 degrees total at wot.

ALL this and 13 psi.............................. so far 460 ish rwhp.

BigRich954RR

iTrader: (1)

Losing power compared to what ?

'Trust'

iTrader: (24)

That has +5* of overlap so it will bleed some boost yes.

ModularTurbo

iTrader: (14)

Yes that cam is hurting you. LSA 114 minimum on a turbo setup

SD99TA214

iTrader: (27)

thats what i was thinking.

I had just compared my setup to my friends and they our almost identical motor wise except cam. hes running a stock zo6 cam and his car makes way more power and has alot broader and smoother powerband on less boost. And i tuned both cars on a dynojet and this is my second short block with identical dyno results.

Seems on semi stock , boosted ls1s, smaller cams with less of a split and more Lobe sep. work better.

MY POINT: i was just comparing my cam specs to other "good" turbo cars , and my cam seems way out to left field.

MosesMcgregor

iTrader: (16)

do you have a dyno you can post up? what is the car puttin down?

SD99TA214

iTrader: (27)

i can get one ya, on a dyno jet on 15 psi 91 octane its only hitting 499 and 482 through a A4

Zombie

iTrader: (2)

Cam isn't hurting you, I bet your turbo is though. What A/R you running and is it tang or on center? What turbine wheel is in it?

Read the cam thread I started, had some good clues in it. Several fast guys are running 15-20 degrees of overlap at .050 lift.

BTW, tuning a turbo car on a non load cell dynojet is a great way to blow up your car when you take it on the street.

SD99TA214

iTrader: (27)

its a .70 a/r 70mm on the compressor side and a .96 on the exhaust.

its the TTI kit so it sits off the front off the left turbo log style header and has a cross over from the right manifold under the oil pan, that feeds to the back of the left header.

And ya we use the dyno strictly for the measurement of part interchange. i prefer street and track tuning.

thanks for the tip on the thread, ill look it up right now

BigRich954RR

iTrader: (1)

Zombie is Right on with this one. Lsa and over lap is not the end all. On a 364 ci i did 700RWHP with a 113 lsa cam at 10 psi with maybe 11 degrees of overlap. Could i have made more power with a different cam maybe. But i was happy with the amount of money i put out at the time.

SD99TA214

iTrader: (27)

ok ...........theres hundereds of guys out ther making WAY more power, not a little , im talking hundreds of more horse power and torque then me with smaller turbos and smaller cams , and less boost with a4s. so if my camshaft isnt the limiting factor in my cars lack of power what other issues could be?

tuned by 2 other WELL known tuners and this techinacly is the 3rd short block(all 3 were stock) ya ya i know. so i know its not the tune.

4 inch exhaust.

ls1 intake (not the best but definatly not hurting)

"cleaned Up" ported 317s.

stock rockers, hardened pushrods , stock lifters , blue stripe 918s.

so is there anything else that im missing that could factor into why my car just doesnt like to make power under boost?

im about to change the cam so we ll have some for sure facts, not just opinions. i have had my car on the same dyno for countless hours. and im one of those "this works and this is why,,,and this doesnt work and this is why" kinda person. Much like you zombie

Professor_speed

iTrader: (8)

Its tough to say with out seeing a dyno plot but Id bet you one of two things going on. 1st possibility is that you are very close to the surge of that turbo and the small amount over lap is pushing you over the surge limit. #2 The red flag I saw in post #11 is 918 springs. its likely you just have a valve float issue. under no boost they might work fine but at 15lbs I don't think they will get the job done. I would run doubles.

calongo_SS

iTrader: (7)

I'd change the springs before the cam.

droksformula

iTrader: (18)

Possibly the converter is not the ideal setup.

SD99TA214

iTrader: (27)

!!!! How could i miss the springs! i BET that could be a definately good place to start looking.. the car peaks hp at 5500.

FWIW the converter is a 3600 vig single disk lockup.

im going to try to post a dyno sheet in a bit.

TurboAv

iTrader: (6)

+1 on springs. I've seen people running a Torquer V2, which is on a 112 make mid 600's through a TH400.

calongo_SS

iTrader: (7)

I'm running that same converter on my turbo setup. It holds OK on the street, but I was blowing through it the one time I had it on a dyno. I was still able to put down some decent numbers though. Still, it's not ideal for a turbo car.

SD99TA214

iTrader: (27)

ya it seems like its not the most efficient on the street but on the dyno i am locking the coverter up manualy.

calongo_SS

iTrader: (7)

I'd be very careful locking a single disc converter at WOT when making the kind of power you're trying to. They're not designed for that.

engineermike

I'm with Zombie. That cam is not the problem. Up to at least 10 deg of overlap has proven many times to help power in turbo setups.