goats&guns

Been lurking for years and signed up just to thank you for such a great read!
Keep at it! I for see 8's at some point. Knowing you, You'll end up with a couple 5.3's and awd....

mightybird

bad *** builds man !! thanks for the reply's on the cam and injectors ***** gunna be fun !!

a4ls2goat

What do your afrs look like on the bottle??

Boosted Firehawk

iTrader: (11)

so what did it dyno with 317s

denmah

iTrader: (2)

i never put the 317s on i installed 799s and it made the same power as the 706s

Boosted Firehawk

iTrader: (11)

gotcha well that sux to make the same power

dirty_old_chevy

Do you measure boost at the turbo or the intake? If you think your coldside may be restricting you, you should compare the two. Maybe your 2.5" piping or your intercooler or both is bottlenecking the system. It seems you never really picked up much on the dyno since your 4.8 days. If there is a major restriction, it will just take more drive pressure on the exhaust side to make that boost, making your efforts fruitless.
I am not an expert by any means, it's just a suggestion.

Tjabo

I looked back about 20 pages, but I never did find the specs on the turbine of your new turbo to compare it to the GT45. Any idea what it is off hand? Not that it should be choking you out, but just curious if it's smaller than the GT45 turbine....

denmah

iTrader: (2)

rob from modular turbo would have to tell you the size of the exhaust wheels,

its a 80/109 compressor 1.15AR exhaust not sure on the wheel sizes though.

denmah

iTrader: (2)

i measure boost at the intake on the megasquirt and on the boost controller.

Tjabo

Ok, thanks!

Here's what I found on their website:

"Turbine 77.5mm exducer 88mm inducer"

That looks to be a hair bigger than the GT45s wheel, so I guess my suspicion that the turbine might be choking things up is unfounded. I was just thinking that could be the case because you reported that the new turbo is more responsive than the GT45. With it having a significantly bigger compressor wheel (which I thought would tend to make it less responsive) I thought maybe it was one of those hybrids with a rather small turbine wheel to help responsiveness... It's definitely an interesting thing to ponder what the bottleneck is, I can't wait to hear.

Thanks for letting us all enjoy this project vicariously through you! (and maybe find some joy in your job next time you do a burnout! Haha)

ModularTurbo

iTrader: (14)

I don't really see a bottleneck.

The car trapped 140mph with stock casting heads and its only a 327ci

Thats brutal no matter how you slice it. That dyno reads low I promise.

86lxnotch

iTrader: (3)

i dont think the dyno reads low personally, its used on some serious powered cars. mine has been on the same rollers. something is off its just a matter of figuring out what it is. i havent paid too much attention but could the cam be a issue now? i know it makes good power but it doesnt mean its optimal

lavoy

iTrader: (2)

i tend to agree, something seems to be holding it back, one thing is why does it pick up such little power after a point no matter how far u turn up the boost. my JY stock bottom 4.8 made 600 on only 17 psi with a smaller turbo. i dont know enough about his set up to offer advice but i can pretty much tell its bottle necked just by what i have read.

lavoy

iTrader: (2)

doubt it , i would look at the intercooler first, i run a ebay one as well, xs power its a massive 4 inch one.

lavoy

iTrader: (2)

on the foot brake a controller wont help cause the spring isnt open any way at that low of psi, and i think you run e85 correct? if so e85 generates much much more exhaust gas then pump gas does at a given rpm and this allows faster spool and more spool on the brake.

jleews6

iTrader: (2)

I wonder if its the ls1 intake that is holding it back. I would have to think that seeing that an ls6 intake flows more if you put one on this motor the boost would drop. Now turn the pressure up to the same as with the ls1 intake and I would think it would make more power.

denmah

iTrader: (2)

well i bought all 3 inch IC piping and im gunna upgrade to that, its 2.5 mostly.

then the 3 inch intercooler i will swap out to a 4 inch, then if its still low i will re do that hot side, and then maybe even buy a ls6 intake, after that i just wasted hundreds to make the same power ill be pissed off for listening to LS1 tech and go back to building junk lol

i mean if you figure the turbo outlet is 3.5 inches, the throttle is 3.75 and my piping is 2.5 lol

friend of mine with a ford small block 332 cube, s480, 3 inch intercooler, but 3 inch piping made 716rwhp on 20lbs on this dyno and he traps 138mph on only 14psi at the track

ill find whats holding it back hopefully.
just a matter of time, i just hate upgrading stuff if it doesnt need it. i guess we will find out what really matters sooner or later here.

if 2.5 piping and reverse T merges make the same power then i dont wanna be right.

lavoy

iTrader: (2)

how long is the 2.5 pipe? does it have any bends?

i used to run a ls1 intake on my older set ups, i currently run a fast intake , the ls1 intake always did ok for me but i never went past 600 with it, my old 6 speed ls6 set up made 605 /645 with a 72mm and 12 psi with that ls1 intake.

6point7s14

iTrader: (3)

My buddy has been 135mph 1/8th with a 3 inch ebay intercooler and 3 inch piping, hate to see u throwing money at it