cablebandit

iTrader: (37)

i keep wondering if a t-76 is too big for my ls1.
I dont need to make over 500 rwhp. Not understanding compressor maps doesnt help either. The reason I ask this is because of lag and KR. I get KR on 16.5 degrees of timing at 7psi...like 6 deg of kr. I get it with 24 degrees of timing at the same 7psi but maybe only 4 deg of KR. It seems to get the most kr when i am in the "ideal" gear and nail it. If i run it on out thru the rest of the gears it seems to go away. I wonder if its the t-76 spooling up closer to my peak cylinder pressure than the incon kits do. I usually dont have max boost till about 3300-3400. Its like the "rush" of boost causes this....once boost is stabalized it seems to get less KR. Since I never hear any detonation, it might possibly be false but I'm not crazy about monkeying with the knock sensors. I wonder if a smaller turbo that spooled faster would eliminate this situation. I'm tempted to try the smaller t-60hifi and see what it does as far as lag and KR. Course it would take more boost i suppose to get the same output but thats not the isssue. Any ideas or thoughts? If incon can make approximately 450rwhp on stock programming and 94 octane, I should be able to make 400-425 on 93 octane with a max of 16.5 timing and not get KR. I know the incon has a much better intercooler setup but my low timing has got to compensate for that weakness on my turbotech kit. Tell me what you guys think?

1997 vet

iTrader: (2)

I have a 60-1 hifi that came from a Turbo Tech kit that I would be willing to sell. It is on my 85 vet right know. It has about 2k miles on it and is in perfect condition. I am wanting to get a bigger turbo. If you are interested please email me at eger62@hotmail.com

jhelms

iTrader: (2)

[quote]Originally posted by cablebandit:
<strong> I'm tempted to try the smaller t-60hifi and see what it does as far as lag and KR. Course it would take more boost i suppose to get the same output but thats not the isssue. Any ideas or thoughts? </strong><hr></blockquote>

Yes, sell me your t76 and get a t60 kit!! <img src="gr_stretch.gif" border="0">

<img src="graemlins/gr_cheers.gif" border="0" alt="[cheers]" /> <img src="graemlins/gr_cheers.gif" border="0" alt="[cheers]" />

smokinHawk

iTrader: (48)

Ever think of rigging up a sequential system. This idea has been pondering in my head. Im not sure If any one has done it, maybe someone with a Grand National. Not sur exactly whats involved either. But if it wasnt to difficult to fab, watchout!
Maybe we should ask the mazda boys.
I need to learn more about that setup.

smokinHawk

iTrader: (48)

Maybe turbotech intercooler is junk that could attribute to some of it.
(note: not sure if it is actually junk, just a suggestion)
Cause on The T-76 you can keep cranking the boost.

smokinHawk

iTrader: (48)

fORGET WHAT I SAID ABOUT SEQUENTAIL SYSTEM I DONT THINK ITS ANYTHING WORTH GETTING INTO.
From what i just got done reading up on it seems to be to restrictive, to complex to many problems.
There is a lot of RX-7s changing over to a single.

You just need to find a way to reduce lag. Whould a better BOV help? Are you routing it bake into the intake or letting it out in the atmosphere?

Give me an idea what your lag feels like? Your starting to scare me about putting my T-76 in. I already turned down a T-60 to get the 76. Should come this week or next <img src="gr_grin.gif" border="0">

cablebandit

iTrader: (37)

The lag is not THAT bad. Its just that I dont have full boost till 3300 rpms (i checked it today) and i want it at 2300 like incon does <img src="gr_grin.gif" border="0">
Once Harlan has the 2 step done, this will kind of be a mute point... Really I just dont like shifting down to the appropriate gear...I am usually 1 gear higher and no lag would make that perfect. Its nice to just roll into the boost. I'd definitely get the t-76 if i had to choose between one...and get ls1 edit. My bypass valve vents into the intake piping.

SlowZ28

I thought lag was only a concern for the smaller displacement import cars with huge turbos. With 5.7 liters pushing that turbo, there shouldn't be any lag.

Alan

smokinHawk

iTrader: (48)

T-76 = big turbo
takes alot to push even for a V-8

By the way what is a "2 step" I havent ever heard of that before, must be my ignorance <img src="images/icons/confused.gif" border="0">

wot247

my idea of a two step is an rpm limiting device that creates a load on the motor by restricting spark through a module, and thus creating a load for the turbo to spool, or more consistant launching at a set rpm for any car.........someone correct me if im wrong but i think i got it right........

<img src="graemlins/camaro.gif" border="0" alt="[Chevrolet]" />

MIGHTYMOUSE

iTrader: (59)

I got the tubo and all the piping/clamps and connectors you need.. turbo was recently rebuilt before I upgraded to the one you have. Let me know if you're interested its just sitting here taking up space.

p.s. i think the lag is just a side effect of the exhaust routing and the pipe diameters, the t-60 still spooled nothing like my friennds incon mustang.

cablebandit

iTrader: (37)

wellllldamn...i'm gonna have to work on that then.
Maybe Rob Raymers stuff will be the ticket

Slow Z28

iTrader: (19)

well if you think about it, the incon system uses two turbos yeah, but they are a lot smaller than that big t-76, so it takes less to spool them up. lag, even with the large 5.7L motor is just something that will be there with that large of a turbo. there are ways to reduce it and get close to eliminating it, but i don't think you'll ever get to exactly the point of the Incon spool up.

Chris

smokinHawk

iTrader: (48)

I'd have to say its the pluming. Got to be a way to make it more efficaint. Ive been looking aroung and found some shorty headers that bolt up to the stock y-pipe, they (well it since you'll only use the one side) should help out some.

TurboBob

iTrader: (1)

Face it, a T76 is a big turbo..... Even with a
V8 it takes some FLOW to spool it. Small pipes
(I haven't seen the TT LS1 kit, but my LT1 kit has small pipes) don't really hurt.

My T60 spools to 5 psi at 2100 RPM on my Impala. I also have a smaller A/R turbine housing (which might help you a little).

Check out www.turboneticsinc.com they have compressor maps and wheel dimensions there.

There are many sizes of compressors in between the 60 and the 76. BallBearing is another option, it lowers the starting point of boost and increases the climb rate. Makes a 76 act like a 72....(rumor has it)

TurboBob
Impala SS Turbo
GN
<img src="gr_images/icons/cool.gif" border="0">