this would be on a 100% street car, looking for 650rwhp on a 393w, could only run a max of 8-9 psi. Would be on a pony down stage 3 hotside

 

if your only looking for 650hp, the GT45R is much too big. Thats a 1200hp turbo. You need a GT42 or GT42R. The GT42 is a lot easier to fit in the engine bay and works a lot better with your 3.5" down pipe. The GT45R needs at least a 4" down pipe or you'll likely run into back pressure issues.

As far as the comparison between the ebay GT45 and a real Garrett GT4508R. There really is no comparison. The ebay version is just a basic 70mm journal bearing with a ported shroud and divided t4 housing. Its made to look similar to a real one but is smaller and doesn't perform the same at all. A real one only comes as 80mm with dual ball bearings. The compressor cover is large frame and the whole turbo is v-banded. Its a big turbo, similar to the size of a GT47 series. The GT4508R uses an 87mm turbine wheel and 4" outlet. Those are two completely different turbos.

 

I have read on another forum that the ebay 80mm gt45 is a copy of the magnum 80mm turbo.

 

I have not seen the 80mm version. But if the magnum is labeled gt45 it's also a copy. So the eBay version must be a copy of a copy.

 

sorry I should have been more specific, im talking about the ebay/chinese gt45 vs the eby/chinese gt45 80mm. The link below is the one im interested in. Just wondering if I could fit it under the hood.

cxracing.com: GT45 GT45R Ball Bearing Turbo Charger 80mm T4 1.15AR + Oil + Flange 900 HP

I have also been looking at the turbonetic tc78 .96 a/r, could I reach my 650whp with it

 

I have a turbonetics t series 76mm on my 383 w/ the .96 hot side and I love it. For being a street truck 90% of the time it's spools instantly and you can be in the power all of the time.If that's your goal the tc 78 would be another great choice and turbonetics make great units. 650rwhp will not be a problem.I think it would be a better choice than the gt turbo. Just my opinion.

 

Physicaly, there is no difference inbetween the 74/80/88mm versions. Its all in the wheel. I have a GT45-88 on my 410W and it is the same as the GT4202 that was on it. I got my GT45-88 from VSracing, a sponser on turbomustangs.com. Id go there before CXracing.

Note: My GT45-88 has a T4i flange on it. I had to enlong the holes on the exhaust housing to fit a T4 flange. Just something to be aware of.

 

if you are talking about real garrett turbos there is a huge size difference between a gt42 and a gt45, also theres no such thing as an 88mm gt45

 

Ummm, no there is not. Side by side there are identical. Want to know how I know? I have both...... Uses the same Discharge and Downpipe Flanges as the GT4202.

And yes, there is an 88mm. I mean, I do own one.
http://www.theturboforums.com/threads/370894-GT45-76mm-80mm-and-88mm-turbos-restocked-again




How you like them apples?

Mww460 - I run a Custom Ponydown B series Hotside with a Custom 4" Downpipe. I don't have a pic of it installed, but for sake on LS1kiler calling my a liar, here is a vid of it installed and running:

 

toxicgt, what turbo kit you running? Also what size downpipe you running. You have any pics of it under the hood?

Rudder9, what size downpipe you running on the t76?

 

The downpipe on my 76mm is 3". I know some would say that's small, but that's the flange size of the turbo.For what I use the truck for, which is 85-90% street and some fri. night and track rentals it's fine.Isn't hurting me yet.

 

I would just get a s475 and call it a day. They are a reliable turbo and sell new for $600ish and can usually be had for $400 used. They make great power. Tons of people running them on all kinds of motors. Great turbo hands down.

 

The turbo on the right is not a real Garrett gt4508R. Doesn't even look the same. Show a pic of your supposed 88mm GT45. Show me the Honeywell number plates

 

this is a real GT4508R..The v band was cut off to use hose couplers. I know a bad idea...



Oh and that 88mm you supposedly have? VS racing sells them for $599. That is a chinese knockoff turbo. Its not even in the same BALLPARK as an 88mm garrett GT series turbo.

 

Yeah, and?

He didn't ask for a GT4508R, he asked about a GT45-88 ebay turbo, which is what I have. Try reading Post #6.

But hey, someone wants to spend $2700 on a "real" turbo, go right ahead. These "knockoffs" have been proven time and time again to make power.

 

In the op it says gt45, nothing about Chinese. When somebody tells me they have a gt45 I assume we're talking about authentic stuff here. If a Chinese turbo is labeled gt45 it's not a real gt45 and shouldn't be referred to as such. The real gt4508r turbos are much bigger, more reliable, quicker spooling and make more power. You show a real gt4202 in the picture on the left but your comparing it to that eBay gt45 should give you an idea about the size difference of real Garrett stuff. There's a reason they cost $2700

 

well i found a rebuild garrett gt4202 turbo for 600.00. Ordered a b&g hot and coldside but it gonna take 14 weeks before it gets here, guess ill have plenty of time to get the car rerady for the swap