Im back

[alphaseinor]

I'm not too sure on the T70, you can always calculate it... lets see... a 3.4l... say 6500 RPM... 5lbs: intercooled
Lbs/Min Peak 35.13358433
Pressure Ratio 1.340136054
The T70 will spool, but what a waste... It'll start spooling somewhere around 3500 to 3750.

8lbs intercooled
Lbs/Min Peak 40.48387636
Pressure Ratio 1.544217687
It'll spool somewhere around 3250 peak boost about 5250-5500 RPM.. then it'll fall off.

14.7 lbs intercooled
Lbs/Min Peak 52.43286189
Pressure Ratio 2
It'll spool about 3500 RPM, and peak about 5500... lots of room for that 9000 RPM redline... LOL

I would look at the T68-1 over the T70... for low boost
5lbs intercooled:
1750 - 2000 RPM spool, Peak efficentcy 4000 RPM, then it'll drop off, but still be producting boost through the redline.

8lbs intercooled:
2500 RPM spool, Peak at 4500 RPM, then it'll drop off, but still produces boost thru redline.

14.7lbs intercooled:
3500-4000 RPM spool, peak at about 5000 RPM, then drop off fast to redline.

Hope this helps...

[alphaseinor]

I also wouldn't discount the GT35R if your are going to go with the 14.7 boost... you'll have power from about 1750 all the way thru redline, with a peak at about 5000 RPM... but man that's an expensive turbo.

[StEvEzAsYcHo]

I know Alpha.. I WANT the 35r.. But I dont have that kind of green.. Not to sink into a single component.. The to4es are cheap enough to take that 1500-2000 and buy the turbo, BOV, WG, IC, and possibly some piping

[alphaseinor]

You know TEJohnson is running a SSautochrome (he'll kill me if i'm wrong...) t04e 60 trim... his problem is the nosedive of boost at 4700 RPM (unless that's valve float). Since both of you are a 3400-ish ccd the selection of turbos is going to be the same. you can pick them up for about $350, either a t04e or a t70

I have a 3400 and I'm looking at the t66 for my 5lb application, a t68-1 for my 8lb track setup, and a t70 for when I let it loose on the strip... definately if you have a 96 or newer PCM invest in the DHP powrtuner, that way you can get a better MAP (2 or 3 bar) and bigger injectors, just program them in.

I have done some rear mount turbo setups in the early 90's... I'm almost always right... I use the method for finding the proper size turbo to figure out aproximately where the rpm will spool the turbo at, since the pressure ratio is always the same (if you have a good wastegate... I use TiAL)

I've already started making my own exhaust manifolds for my car since I don't know when i'll have the rest of my stuff from Germ and DPP. I'll have a friend weld them up this weekend or next... 3 weeks isn't bad from start to finish on a prototype set.

[timg]

A few things. Some 96 Z34's got a 4T65E, BUT it used the old 4T60E transmission controls. The 97 Z34 4T65E should be virtually identical to all of the later 4T65E's.

The Ebay T70 is NOT a T70 at all. Beware as there are NO accurate compressor maps for it. Some ebay turbos can be very good, some are nothing more than shiny (or not so shiny) repackaged crap.

Another thing- ebay turbos typically have VERY small turbine sides designed for small displacement 4 cylinders. Avoid them at all costs. The compressor and turbine sections MUST be properly matched. A proper match will maintain power all the way to redline while still being responsive. A 0.63 a/r T3 stage 3 turbine is WAY too small for anything over 2.5 liters. I would be hesitant to even run a 0.82 a/r stage 3 T3 turbine side.

The 60-1, 62-1, 60 trim T04E, GT35R, GT40R, GT4088, GT4082, and T04R should all be very good matches (though all focus on different parts of the powerband). I do NOT recommend a T66. The 60-1 and 62-1 will be cheaper and spool much better. The GT40R will spool faster than the T66 and it's a pretty large turbo!

My 60 trim T04E holds boost all the way to redline- there's absolutely no drop. The only difference in wheel size between the 60 trim T04E, 60-1, and 62-1 is the inducer. All have 3" exducers on the compressor and all are available with the same turbine sides.

If anybody wants a copy of my turbo calculation spreadsheet, PM me with your e-mail address. It has charts (boost vs RPM) with the GT35R, and GT40R plotted. The numbers themselves should be helpful for plotting the engine on the compressor map for any other turbo though.

Tim

[nocutt]

...A proper match will maintain power all the way to redline while still being responsive. A 0.63 a/r T3 stage 3 turbine is WAY too small for anything over 2.5 liters. I would be hesitant to even run a 0.82 a/r stage 3 T3 turbine side.

Tim, it really depends on what amount of boost you will run...and also if "stg" literally means stg'd. I have seen a ebay staged wheel (III) and it was nothing than a gn wheel. My point is, if we are trully talking stg wheels here, then the amount of boost (well I guess to some extent displacement matters)...but you seem to be making a broad stroke assertion...a stg III wheel for example will flow like a mofo on an LQ1...especially in an .82 housing!!

...
The only difference in wheel size between the 60 trim T04E, 60-1, and 62-1 is the inducer. All have 3" exducers on the compressor and all are available with the same turbine sides.

...If you looked at them for face value, you will miss other differences that are as important...while I agree with you on some levels...look at an H-trim versus a 60-e wheel. Yet a H-3 will outflow a 60-e. Pitch is quite different...the H & 6X dashes are a completely different family...they are for the most part not suited to high PRs, but do flow like a Mofo ...

[timg]

I have made some pretty broad claims. I think the stage III T3 with a 0.82 a/r would work pretty well on the 3.4 DOHC. It should spool significantly faster than the P trim. It's probably much better for a 5-7 psi low boost setup than the P trim is. I just don't like the thought of a T3 turbine side on anything over 3 liters. With a T3, if you decide that it's too small, you will be limited. With a T4, if you decide it's too small, there are lots of upgrades out there. On the other hand, the P trim is not exactly known for being fast spooling...

I understand that there is more to compressors than trim, wheel size, and a/r ratio, but they are good predictors of spool, powerband, and ultimate power potential.

The wheel stages I was looking at are from http://www.turboneticsinc.com/pa_turbwheels.htm The stage III is the most common wheel in T3/T4 hybrids. The stage V is a larger wheel and halfway between the T4 P trim and the stage III T3. Here's an example of the type of turbo I'm talking about. http://cheapturbo.stores.yahoo.net/gat3w82ar.html

The ebay turbos are different because they seem to be marketed by people who have absolutely no idea what they're selling. When it comes to specifications, they seem to label them with whatever they think is trendy and will sell rather than what they are.

Tim

[StEvEzAsYcHo]

Great info guys! I appreciate you sharing it here!

I found an HX35 on eBay I am looking at, and a few t04es, but they are ridculously small..

..THe HX35 has 5 days left on it, so I am going to sit on it, and research some more about my Turbo application.. Woot!

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[StEvEzAsYcHo]

Hah! I think THIS is the way to go:

T04P; Turbo T61, 62-1 / T4 .60 / .84 Borg Warner Shaft

eBay Link

Good turbo?

Also, what do you guys think of the internally Wastegated turbos? Any good? I was thinkin of goin with an external gate anyway, just not sure what to go with there.. I was thinkin DSM stuff.. Cheap and plentiful

[timg]

By the wheel sizes, it appears to be a T61 with a P trim T4 turbine. It's NOT a 60-1. It is larger than a 60-1- it's similar in size to the GT40R's compressor. It will be laggy, but the compressor seems to be a great match for the LQ1. I'm going to guess that it won't be loads of fun off the line, but would be awesome once the car gets into second gear or higher.

Tim

[timg]

I'm a big fan of external WG's. I've been using a Tial 38mm and a Turbonetics Deltagate. I have a Tial 44mm waiting to go on the Monte. Tial's are nice, but some of the ebay knock offs are much cheaper and pretty good. BOV's and WG's seem to be good places to go with knock offs if you want to save $$.

Tim

[StEvEzAsYcHo]

Hmmm.. Second gear.. Well, that would be fun since i am goin 6 speed with this.. Like i said, I am window shopping turbos right now.. THanks Tim.. I was planning a Tial external WG for my setup, but I was just curious what people like in their WGs.. Internal, external, or what..

[nocutt]

Hmmm.. Second gear.. Well, that would be fun since i am goin 6 speed with this.. Like i said, I am window shopping turbos right now.. THanks Tim.. I was planning a Tial external WG for my setup, but I was just curious what people like in their WGs.. Internal, external, or what..

I agree with Tim on the specs...although the sellers are throwing wrong nomenclature all over the place.
IMO, this is not a fun turbo for street duties...if you can live with the lag then fine...BTW it is a T04S spec'd housing...that is 4" comp inlet and 2.5" comp outlet. That is Huge for a street app that is a lil over 200ci. Also find out whose compressor wheel they are using...

[StEvEzAsYcHo]

Good call guys.. I was wondering if I was just stupid when they were throwing some of that stuff out there..

..It is hard it seems to find a turbo with a 60 trim or better.. A lot of the t04es are 57 trim turbos.. Oh well.. The quest will continue!

[StEvEzAsYcHo]

Update 7/24: The motor is ready to be de-pistoned! PICS!

***56k alert!!! HUGE 5MP images!***

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Now, I need ot start looking at getting forged pistons and rods, and also some other parts for it.. I AM wondering how people here (If anyone is using them) likes the light weight lifters for their LQ1.. DO you like em? If so, why? Howdifferent does it fell with them in? Don't like em? THoughts? hehe..

As for everything else, I am going to buy the parts literally from the ground up.. Forged rods, then pistons.. Then do some head work (I AM going to check and see if the heads warped at all when it overheated).. then go up to the valves n such.. I KNOW I need new ones as about 12 of them hit the floor when my friend lifted the first cam carrier..

I am going to get my transmission and turbo around the same time I am hoping..

WOOT! Im still sore from the wrenching cause a lot of them bolts were on tight! Oh well! WOOT!