Ok I'm just about to order this turbo but I'm wanting to check it out with ya'll being that ya'll know turbos a lot more then I do. I know how they're setup and how to build them but the trim and air flows and everything confuses me. Anyways the turbo I'm looking at is:

Memenclature (tag ID) T4 GT 45 Y2004K
Inlet (exducer/hot side) T-4 Flange 70.1mm x 82.5mm
Outlet (exducer/hot side) 4.25" V-band
Inlet (compressor/cold side) 109mm
Outlet (compressor/cold side) 86mm
Exducer A/R 1.05
Compressor A/R 0.66
Bearing type - Ball Bearing
Cooling/Lubrication Oil/Oil
Oil Supply Fitting Flange
Oil Return Fitting Flange
Compressor major diameter 98mm

Ok I get what some of this is but the rest I have no idea what the rest means or anything. I was planning on doing a twin turbo setup but by the sounds of this turbo I think I'll only need to do a single. This kit Is going on a 2002 GT and I'll have a built bottom end with 8.0:1 compression and ported heads with cams. What size intercooler should I run or does it not really matter, just as long as it cools right? Ok that's enough questions for now, I'll ask a few more later I'm sure, thanks for the help ya'll.

 

need some more info on your setup, such as ci, drag/street car, how much poer you are trying to make.

 

I'm probably going to leave the motor the stock bore size, 281 ci and i'm going to leave it the stock stroke, i will have port/polished heads with cams, the car is going to be a street/strip car, and i'm looking for around 700-800rwhp. Is there anything else you need, that's all that i can think of.

 

I believe that you are going to have to spin that motor pretty high to take full advantage of that turbo. It's going to be pretty laggy on the street, but on the track if it is setup right and you are leaving off the t-brake you should be able to build a decent amount of boost off the line.

 

Do you think it'll do better if I was to bore the block .020 over to unshroud the cumbustion chamber a lil bit, and then throw on some fully port/polished and cammed heads and maybe a different intake manifold. Like I said I'm knda hoping for around 700rwhp on the street, and 1000rwhp at the track. If I can only get it for track like that then i'd rather do a different turbo. And if you don't think this turbo would be a good street candidate then what do you think a good turbo for a single turbo setup would be for around 700rwhp? This is the thing that's getting to me, I wanna do a twin setup but it cost a lot more, unless I can find two T4's for cheap. What's your honest opinion on this, what woud you do?

 

Well if you are looking to reach upwards of a 1000hp for the track you will need a turbo that size. The lag will be very noticable on that sized motor especially on the street. The only way that turbo would be a good street candidate is if you have a big ci motor. going .020 is not going to significantly help. What transmission are you running? Do you plan on seeing more street duty with the car?As far as what single turbo I would choose that should come pretty close to your goals would be the Precision Turbo T76GTS with a .81 exhaust housing. i think this would be quite an improvement, especially on the street. It is pricey, but I do not know what your budget is.

 

or do a VT 5L stroker

 

Right now I have the stock Tremec 3650 but I'm going to put in a TKO 600 when I blow this one up. Budget is whatever this cost, I'm wanting it to be as little as possible but I'll pay what I have to in order to have big power.

 

Thought about it but I'd rather stay with a modular motor and I'm not to big on stroker motors, especially with the modulars. They have a high enough stroke as it is already. But boring them .020 over or doing a big bore .030 over is a possiblity, but that's like an extra $1000 in block prep for the sleeves.

 

Much better off with a MP T70 with a .68 A/R or a 62-1 with a .68 A/R as the 1.00 A/R is gonna kill you. The MP 62-1 will easily make 600 RWHP (well beyond the stock limits) and the MP T70 will make 700 RWHP and has great resale value.

 

The MPT70 will not reach his 1000rwhp goals unless he has two of them.

 

What twin setup should I go with? I'll just merge the two turbos into one pipe into the intercooler and that's how i'll save the extra room I guess. Then I'll run them into one exaust pipe and then split them back into two. How does that sound?

 

I forgot to ask but what intercool would support that kind of horsepower from either a single or twin setup? The highest ones I've seen only go to about 700rwhp.

 

there are several intercoolers that support that much hp. what's wrong with a stroker mod motor? they are a square motor. meaning almost same bore and stroke. easier to rev that way. the only way you will enjoy a turbo that large is by a bigger motor. if not a gt40 would work great, the 76gts like stated above. what intake are you planning on running?

 

The mod motors have big enough stroke in them, if you stroke them anymore the piston almost ends up going over the deck height. I was going to go with the P51 intake but then I saw the $1000-1200 price tag and said nevermind. Thought about going with the typhoon intake but heard they were shit. So now I'm looking once again. Thought about just having a custom one made or porting my stock intake. Oh and were have you found intercoolers that can support that much power. Do you have a link?

 

Well with the kind of set-up you are seeking nothing is going to be very cheap. If you are heading to a twin set-up i would go with 2 MP t70's. A cheap intercooler off of ebay will not work well for your set-up. I have had good luck with the precision and spearco intercoolers, but expect to pay in the 5-700 range for one. I would not merge the downpipes. That will be a lot of pressure your are trying to squeeze through 1 3" pipe. i presume you are going with a 3'' exhaust. Also I would get creative on your intercooler piping and get an intercooler set up for a twin setup with a 2inlets and 1 outlet. You just have to decide if you want this to be a primary track vehicle that will se the street rarely or a street terror with occasional trips to the track. What kind of time slips are you looking for? Have you planned out your fuel sysem to support 1000hp?

 

This is going to be a street terrorizing machine that eats little rice cars for breakfast and will see the track a few times a year. I'm starting to think going with a 700 hp setup will be a lot easier and a lot more cost effective. And yes I'm planning on running 3" exhaust. If I do a twin setup I was going to merge the two into the intercooler but keep the exhaust side seperate. And the intercooler pipes were all going to be 2.5" but if I'm not mistaken shouldn't I run at least 3" through everything for at least 700 ponies and higher? I think this would be easier if I set this up with either a single T70 or twin TO4B and just deal with whatever power I get out of it. I know it'll be a lot with that alone. And the fuel system I'm going to run with is Areomotive and I'm going to throw in an 03' Cobra tank as well. Oh yea I keep forgetting to ask. I'm going to be buying the new bottom end pretty soon here, what crank do you suggest? I think I'm going to go with Manley I beam rods and some forged 8.0:1 pistons. Any other suggestions? I don't know if I said it already but thank you for sticking with me on this and helping me out.

 

I think that for a street terror you will find a single t70 to be more then adequate. You will make 600+hp with it and have a hard enough time trying to get traction on the street. with a setup like this you will rape 99.9% of the cars out there. As for the crank I am not familiar with what the hot set-up in the modulars is. Manley rods are great and I always like cp gas ported pistons. Make sure you get a stick set of rear tires such as mt drag radials or m&h radials. With that kind of power it is going to be an animal.

 

Yea this is starting to sound much better and a lot easier to build. Do you think with a T70 I should still run 3" tubing with everything and then with the exhaust split it from 3" to 2.5"? And should I go with a .68 A/R?

 

I think if you are going to push the turbo to 600-700hp I would go with the .81 housing so it does not run out of steam on the top end. I would also upgrade to a 3'' x pipe and catback also. Turbos love the least amount of backpressure. As for the coldside piping I would go with either 2.75 or 3''.