imported_Paolo

Hey guys, when i was looking on the internet for dyno charts for stock Boosted LS's i had alot of trouble, and alot of inquiries on how bad ebay turbo kits were, so now that iam completely finished my car, and its been to the dyno twice, i would like to post my set up, for anyone who is looking to boost an LS, or just anyone who is interested.

My set up:

Completely stock LS
No name ebay turbo kit
RC 440 injectors
2.5 " exhaust ( bottle necks into a 2" near the muffler)
T3/T4 .63 A/R, .50 A/R Compressor
Cast iron log style manifold
2 1/4 " charge piping

It was street tuned by Zeeman, only about 2 hours, and tuned for 91 octane ( he recommended 94 ) but i decided to go 91 octane. I had a wastegate problem, i was boosting @ 11psi, with a 7 pound spring, dont know why, this was my result at the dyno @ 11psi




I changed the wastegate a month later, and i just went back to the dyno with a brand new Turbo Smart wastegate, and Zeeman dyno tuned it..




the first run was @ 9psi, with zeeman just starting to tune, and the last one was @13psi, and the big dip in the chart is me letting off the gas, to be honest it was making a crazy noise when is spooled, i thought something was wrong so i let off, i made the same power,and like 30wt @2 psi less this time, by zeeman doing it on the dyno, i strongly recommend dyno tuning , i am really happy with the results,and i really recommend Zeeman, he was a great help during the turbo build, and he has tuned for me 3 times now, and i am more then happy with his street tuning and dyno tuning results, considering this is a $1400 Ebay turbo kit, that i have been driving for 6 months now. Zeeman has also done other minor things on my car, answered alot of questions, and still has not steered my wrong, i recommend him 100%.

This thread was only made to help show Boosted LS results, please dont post dumb replies just to say something, im not comparing my set up to anybodys, dont post saying u dont like the numbers or anything like that, or ur set up is way better, or produced way more, I am more then happy with what i have.

imported_Paolo

I forgot to mention, The first pull i did @9psi, was 210whp, 208wt, the one in red on the graph is run 5, the car was really hot, and losing power. I also did 237whp, 243 wt @ 11psi

imported_Zyepher

andrew is the shnizle for nizle

imported_MiC

not bad!
those are good numbers.
keep up the good work!

brianmcgaugh

not trying to come down on your setup or anything but get a bigger exhaust (or a cutout), itll be a totaly differnt car if you did
Im a big fan of boosted LS's i had one and it was full of tq and fun as hell to drive.
Just for a comparision heres what i gained from closed cutout, through stock exhaust 1 7/8" vs open cutout 3"

imported_Paolo

i know a bigger exhaust would equal more power, but then i need another downpipe aswell, and a new muffler, there are other things on the car i would like to spend that $1000 on instead, the set up is in a EG hatch, the tires already spin steady, im happy with 255whp, but i understand what ur saying

imported_Paolo

im curious to know @ what psi did u run those numbers on brianmcgaugh?

brianmcgaugh

I would at least have it full 2.5, 2" is a real bottle neck.
youll have a faster spool, make better #'s with less boost, possibly save your turbo

Sorry that was the wrong dyno sheet that sheet was my buddys setup almost identical to mine but he ran a 2.5" exhaust turbo back and the same amount (if not more) boost.

i edited it

it was on 11 or 12lbs for the 302/262 and with the same WG spring id only boost to 9lbs for the 201/189

imported_Paolo

nice numbers, the upgrade in exhaust might be a future project, but i doubt it, like i said i have a few other things i need to worry about on the car first

brianmcgaugh

the 2.5 is ok (not optimal) but that 2" really has to go

imported_Paolo

understandable

dingus888

you should do the restrictor mod...seems that too much oil pressure kills thsoe ebay's fast, they don't need 50-60 psi of oil pressure

b18bHatch

restrictor mod? ive been hearing this what is it?

zeeman

iTrader: (1)

its where you put an oil restrictor in the turbo oil feed line, its basically just a fitting with a smaller hole in it to limit the amount of oil that passes through it.
Definately a good idea on all boosted setup.

chris_si98

I agree..

And if anybodies actually seen the tiny turbo seals, you'd see why. They should only be seeing around i'd say 12-15psi. On a cold start up oil pressure can be pretty damn high too... almost 4x that

imported_Paolo

Thanks for the input Zeeman, ur my hero, N.A.U.C

b18bHatch

an ebay turbo puttin out these #'s...impressive...ive really been thinking about an ebay turbo kit as its the only thing i can afford at this time.

brianmcgaugh

Thats what i thought as well
but i decided to email precicion about my SC6152SP, this is my email and there response

Hi,
I have a SC6152SP and I will be using it on my built Honda. As Hondas can make over 80psi of oil pressure I was wondering if I should be using an oil restrictor. I have been told both yes and no. Most, if not all, say that with a -4an feed line yes its need, then a lot of people I have talked to differ on a -3an feed some say its not needed some say yes use a .06" restrictor.
Can you help clarify when an oil restrictor is needed?
Thanks,
Brian McGaugh

Brian,

Thanks for your inquiry. Typically on non ball bearing turbos, we will not recommend the use of an oil restrictor. In some very rare instances, the use of a restrictor is necessary. On ball bearing turbos, we recommend the use of an oil restrictor.

Regards,

Joe @ Precision Turbo

I also asked stan from fast-turbo, i bought my oil lines from him he had an amazimg deal at the first of the year, and he said the same that with a -3an line no restrictor is needed (just make sure your drain is perfect).


none the less with an ebay turbo id run one. just get a ss fitting, weld it and drill it out 1/16"

zeeman

iTrader: (1)

well, i've personally seen a non ball bearing turbo (i believe it was a t3) just recently too, **** oil out of the seals from not having an oil restrictor, he thought his turbo was pooched. But he put in an oil restrictor and problem gone, no more smoke, no more oil pissin out of the turbo. But a few weeks done the line, the seals on the turbo went and he had the same problem.
I'm willing to bet that he'll keep the resitrictor in his oil feed line. B/c it didn't take long for the seals to crap out on him, i mean he put maybe 10 kms on that turbo and maybe an hour of the engine running before having oil **** out of the turbo seals and putting the oil restrictor on, this was a brand new turbo as well. Then he put in his restrictor, we tuned it, and it was fine for a few weeks, but now his turbo is at the rebuilders.

But at the same time, the MAJORITY of turbo cars i tune do not have an oil restrictor and their turbos have lasted them a long time (one person has been year round daily driving his car for 4 years now, on a greddy kit).
When i boost my car, i'll be using a restrictor, prolly regardless of what type of turbo i decide to use.

Anyways, paolos car is the perfect example of amazing bang for buck. I don't wanna speak for him, but he's got very little money invested into this car and put down 251whp and 237ft/lbs on a very very simple setup.
It also illustrates the importance of dyno tuning for someone who'd like to get the most out of their setup. Now he and i both realize that we most likely could have squeezed more power out of his setup with more time on the dyno, but he was quite satisfied with the results after only a few hours.
If you compare his new dyno sheet to his old 91 octane street tune (with lots of timing pulled out for safety using the 91) at 5300 rpms he made 237ft/lbs while on his old 91 octane tune he made 165ft/lbs. So that is a net gain of 72ft/lbs at only 2psi more boost and a 94 octane dyno tune.
Just in terms of peak power (which isn't the most important thing) he picked up 42whp and 60ft/lbs.

Just for ***** and giggles i overlayed his old dyno sheet with his new one so you can really see the difference.
http://img.photobucket.com/albums/v2...sdynocopy4.jpg

You can see, at 4800 rpms he gained almost 100whp over his 91 octane 11psi street tune.
Overall, the car is hella fun to drive, starts up and runs mint everyday, doesn't smoke, makes wicked power and didn't break his bank.
Good job with your car paolo, its been a pleasure helping you along with your build.

brianmcgaugh

Its all who you ask i guess.
i find its about 50/50 for using a restrictor or not, for -3an for -4an almost everyone agrees its to big and should have some restriction.
what size line and what turbo was he using when his seal went in 10 min? If oil was blowing past the seals in 10min thats gotta be a turbo problem...pre-installation failure.