LS1Tech.com (A usefull Chit chat)

[Camshaft]

Just read this Chit Chat AMEGOO"S

first of all, i am, without a doubt putting a turbo on my car so please don't tell me to search this topic. with that aside, here's what i'm asking. i've got a 96 trans am w/ a low compression (approx. 8.5:1) 383 stroker w/ a summit crank, eagle rods and JE forged/dished pistons that is being freshened up by Texas Speed. the heads are ported and pollished as well as the intake. stock valves will probably be replaced w/ aftermarket depending on what the machine shop recommends. what i was wanting to know from the :hail: "Turbo Gods" is which turbo would be best suited for my setup? I'm not looking to have the fastest car around, but would like to have it somewhere in the neighborhood of 12 - 15 psi. normally would only run 5 - 7 psi, but might turn it up at the track. this is going to be mainly a street car but will see some track time occasionally. I've been mainly looking into the PTK because of the header setup they include. so far in my searching, i haven't seen another kit w/ these. don't really want an air-to-water intercooler either. if you need more details, let me know. thanks in advance, Johnny.

[Camshaft]

Someone else replies:-

I would probably go ahead and go with a single t76q or R trim. It will allow for a little more headroom in your setup, while still giving you as much throttle response as you could desire (probably more than you want depending on the a/r ratio).

What's really going to make the difference is the kit, supporting parts, and tuning. One of my roommate's is building a few LT1 turbo kits (has already done a few also) - you can see pics @ http://www.fastblackcar.com/camaro/turbomotor/ - that's from the first generation of kit. (That was a t-76 q trim).

[Camshaft]

another reply:-

looking at the compressor maps and the boost pressure you want to run... you could use a single a T-88 or two T60-1/T62-1's.

[Camshaft]

..Someone is disagreeing :-



i dont really agree with that but...


http://www.fastblackcar.com/camaro/.../header/coated/

are the headers(for my PTE88) going on my car..

The PTK kit is very nice, but for (i think) the power you want it might not be the best choice. The PTK kit was designed around a stock car, stock k member, ABS in stock location etc.. so some pretty big compromises were made. if you dont mind moving some small stuff around(mainly the ABS).. you can do a better job. you will notice the PTK has a 90degree bend at the cross over junction.

Dont get me wrong, the PTK setup is nice.. but its kinda like a base S-trim kit.. its meant for something, some people push it.. but its not meant for bigger/better


Email me and maybeI can help you out

[Camshaft]

Chit chat warms up.....


Just wondering.... why do you disagree? When I plotted the airflow requirements on to the compressor maps I thought it looked pretty nice for the 60 series. Maybe a little iffy on the 88. What would you recomend?

Gary

[Camshaft]

The Cool:-

I would also think a T-88 is a bit much for what he seems to be asking. Obviously it's hard to tell with just boost levels instead of HP goals, but either way a t-88 is going to be able to support a good bit more than his 12-15psi on whatever engine he wants.

A T76R trim would actually come somewhat close to a small frame T-88, and should spool better, etc.

[Camshaft]

Someone replies the cool Dood.....


ya, your right about the 88. In fact I went back and replotted everything on the T-76 map and it does look like it would work. I must have typed something in wrong the first time. The only thing I noticed is that at rpm's above 6K it (the T-76) looks like it is getting out of it's efficniency range, but that probably isn't the case on the R trim.

[Camshaft]

Stranger comes in and :-

Sounds to me like you have maybe only a few choices for an LT1 turbo kit:

Turbotech
PTK

I wonder if the Turbotech kit would support your 383ci.

The PTK sounds promising.

[Camshaft]

The Disagreeing Talks:-


PSJ- there are other choices

Anyhow, the T76/GTQ will work well, however I am of the belief that the standard t04 stuff is just too small(exhaust FLOW wise) for big power V8s. they are better in twin setups. Not that they dont make power of course.

although the 88 would work for your app, it might by laggier than a T76, and you wont be using the full ability of the 88.

[Camshaft]

A new guy comes in :-

Yah PSJ, there are others...dunno how available the one I am thinking of is though... www.chargedair.com I know he has some LS1 and C5 kits out but I might still be the only LT1 kit...

Are you selling kits Jordan?

Besides the one I am talking about, there is also one being worked on down south...I think they are looking for like X cars to put them on or something at a decent price for more testing. www.turbolocity.com. Its a twin setup.

[Camshaft]

The one who started this chit chat says:-



sorry, i wasn't very specific in my original post. i've looked into both the twin and the single turbo setups and have decided that i want a single. most have suggested the T76, however, a local guy that was sponsored by turbonetics has recommended something called a GT40. haven't heard much about these, but according to him it is hands down the best choice for my application. any1 know anything about these or if he's right? as far as horsepower goes, like i said, nothing mind blowing but above 500 RWHP. hope this makes a little more sense now. i'm by no means an expert on turbos, but i figure between the motor setup i have and a decent turbo/ic, 500 should be easily obtainable w/ room to expand. please let me know what you guys think.

__________________
1996 WS6 Trans Am- Low compression 383 stroker- eibach sportline springs- bilstein shocks- SLP CAI w/ Vortech polished elbow- '01 Vette wheels- solar wing- Soon to come: TURBO

2000 Yamaha Banshee- bored .40 over- V-force reeds- toomey T5's- ASR +2+1 a-arms- Lonestar +4 swingarm- Lonestar +4 axle- Sidewinder titanium chain and sprockets- billet everything- custom wheelie bar

[Camshaft]

GT40 Compressor map

Going to be pretty close to if not maxxed out at your 15psi value. Say around 600rwhp max. I would want a bit more headroom than this turbo offers.

Just a guess but is this local guy more familiar with smaller engines? That's the biggest "issue" you will run into - the exhaust volume you have with a 383" V8 is a big difference compared to what alot of people are used to sizing turbo's for.

[Camshaft]

For comparison here is a T-76 compressor map.

[Camshaft]

Chris says:-
Should support closer to 800rwhp MAX - but since realistically there is not reason to do a max effort setup here it would be a more comfortable choice, plus giving you room in the future if (when) you decide you want a bit more power You compression is low enough either way.




Chris

[Camshaft]

The end of the chit chat.....

Chris, that was exactly what i was looking for. looks like every1 was right in suggesting the T76. couple of questions here also, does this come w/ a ballbearing option and would you recommend going that route? also, the guy that was suggesting the gt40 to me is more familliar w/ built mustangs. thanks again, Johnny.

[west coast]

:tmi:

[ZOSicK]

those guys r so technical .. i love the way they talk bout stuff like that :bigok:

[Diablo]

Too much maybe for you Dood for us it's useful tyt.....:booty:

[Spawn]

yes it is intersting..

I usually get into Z28.com I like the way they help each other in sharing their Ideas, besides thats the whole point of a forum...sharing Ideas and having fun :bigok: