T4 on a 420a

[Nathank]

i'm wanting to put a GT45R T4 on my 420a. It is fully built from the ground up. It is going to be a time attack/road course car. This is a semi-daily driver, but mostly race car. Will this work for my needs? Here are the specs on the turbo:
Maximum Horse Power 400-600 HP
Type of Cooling Oil Cooled
Inlet Size 4"
Outlet Size 2.5"
Type of Bearing WET FLOAT BEARINGS
Maximum PSI Capacity 28 PSI
Compressor .70 AR Compressor
Compressor wheel exducer: 84.20mm/ inducer: 66.71mm

Turbine 1.00 AR Turbine
Turbine wheel Inducer: 73.60mm/ Exducer: 63.56mm
Type of Flange T4
Type of Down Pipe Flange 3.25" v-band

 

[white92talontsi]

Are u serious?

Sent from my PC36100 using Tapatalk

 

[Nathank]

I'm new to turbos, so this is a serious question.

 

[RadDsm]

Rofl

Do some searching on how big a GT45 is. It would be a good turbo if you want an extremely laggy 900whp fwd auto-x car.

Needless to say, this is not a good choice of turbo for a road race car.

 

[95TalonOwner]

I wouldn't go with something that big for road course racing.

 

[Nathank]

What is a good one for my needs? Should I just stick with the traditional t3/t4 that I hear so much about?

 

[agentorange313]

"uncle must do research!" - Uncle from jackie chan adventures.

You need to do some research.
What are tour power goals? This turbo is over kill for most peoples applications. What psi are you planning on running this turbo at? You might be better off with a smaller turbo for your power goals.

That turbo is huge, I would not consider it a "streetable" turbo, but some think the 35 is streetable. not in my book. You internals seem to be fine for running this turbo.


To answer you question, yes this turbo will work for your needs. Now if you are wondering if this is right turbo choice for 400-600 hp, no I think thee are better/cheaper options.

 

[snowborder714]

What is a good one for my needs? Should I just stick with the traditional t3/t4 that I hear so much about?

What are your goals? I see you want to build a road race car, so there's a variety of different turbos you could run, all depending on how much lag you want, how much hp you're looking to get, how much money you want to spend, etc.

 

[Nathank]

This is my first build so 300-400hp. Not wanting to wait for spool up till the next corner, so very little lag. Cash flow isn't an issue. Just want something with quick spool decent power and something that'll keep me in the race.

 

[agentorange313]

t-4 is a huge housing for your powerplant. I would stick with maybe a tdo5 housing with a holset turbo. That might meet you power requirements. OR even use a t-3 housing. There are plenty of dsmers using t3 hosuing making that power.

 

[snowborder714]

I'm not sure how putting turbos on 420a's work, but an Evo 3 16g would work just fine for that hp range and would have a quick spool.

If you want something that makes more (and costs a good bit more), you can look into the FP 68HTA. Looks like a 16g, but flows more.

A turbo in between the 68HTA and the HX35 would be an FP 3065, which will cost you a good chunk of change.

If you want something even bigger yet, I'd say look into a Holset HX35.

 

[RvlutionMtrsprt]

Simply and kindly put, no.
Looks like you pulled those turbo specs straight off an ebay page. Think about it, a GT42 is a DRAG RACE turbo that's known to make 900+whp. The GT45 is even bigger (more lag).

 

[Nathank]

that was a copy/paste deal. just wanted some more opinions. i'm a big boy so "no" won't hurt my feelings.

 

[cookmeup272]

I wouldnt go with something that has a DSM flange, if money isnt an issue then some sort of twin scroll T3 turbo might be best. Possibly a twin scroll hx35 or something like that.

 

[JusMX141]

Here's a GT45R (left) compared to a standard T04E Garrett Hyrbid (right).

The turbo on the RIGHT is too big for time attack / road course use...so what is the turbo on the left?

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[cookmeup272]

Lol how much does that thing even weigh?

 

[richard33]

This is my first build so 300-400hp. Not wanting to wait for spool up till the next corner, so very little lag. Cash flow isn't an issue. Just want something with quick spool decent power and something that'll keep me in the race.

if cash flow isnt an issue why turbo a 420a? Why not just buy a GSX and do it right.

 

[96awd]

if cash flow isnt an issue why turbo a 420a? Why not just buy a GSX and do it right.

that's what i'm saying. If you have all that money in your car, and it's a nice car, you could get an ok piece of change out of it and with that buy a car that is already turbo'd and add to it..

 

[richard33]

that's what i'm saying. If you have all that money in your car, and it's a nice car, you could get an ok piece of change out of it and with that buy a car that is already turbo'd and add to it..

some people want to be different (slow)

 

[Shake_Zulla]

I think its the american way to think bigger = better, right? Anyhow, a little more info on what your setup is might be helpfull. Built motor? We are left to guess that you forged the pistons and rods and lowered the compression down to 8.8:1 and maybe some head work right? Any other mods? Stock fuel pump? Ignition? Injectors? management system? All that needs to be considered before IMO going above 8psi. Plus what does your autocross track looks like? Ours in Boise are mostly tight small tracks where its hard to get out of second. There you want a smaller turbo so less spool time since it's hard to float in the higher rpm's. Plus more gains would be achieved by putting in a LSD and a good suspension setup then blowing all your money getting to 25psi. Without knowign any of this, however,, I would say a 16G would be just fine. Nice to see another built 420a though. I will be starting my second this summer. Good luck man!

 

[ziggo0]

I think its the american way to think bigger = better, right? Anyhow, a little more info on what your setup is might be helpfull. Built motor? We are left to guess that you forged the pistons and rods and lowered the compression down to 8.8:1 and maybe some head work right? Any other mods? Stock fuel pump? Ignition? Injectors? management system? All that needs to be considered before IMO going above 8psi. Plus what does your autocross track looks like? Ours in Boise are mostly tight small tracks where its hard to get out of second. There you want a smaller turbo so less spool time since it's hard to float in the higher rpm's. Plus more gains would be achieved by putting in a LSD and a good suspension setup then blowing all your money getting to 25psi. Without knowign any of this, however,, I would say a 16G would be just fine. Nice to see another built 420a though. I will be starting my second this summer. Good luck man!

That's a stupid assumption...he clearly stated he is new to turbos, when I first got into turbos the only thing I ever heard of was a GT35R...now there are so many numbers in my head it hurts - give him a break.

 

[Shake_Zulla]

That's a stupid assumption...he clearly stated he is new to turbos, when I first got into turbos the only thing I ever heard of was a GT35R...now there are so many numbers in my head it hurts - give him a break.

I'm sorry I wasn't trying to be a jerk about this don't get me wrong. He stated above that he has a motor built for boost and I was trying to say that more information is needed. I didn't make fun of him for his turbo pick I was only stating that you need to consider all the things in my post. It sounds like he doesn't want to start small and work up so a clear plan is needed. To the OP: 2GNT.com - Power_Stages this should give you some info. Also on Hahn's page they talk about the diff between the 15G, 16G and 20G. Seriously my previous post was givin in the best of intensions.

 

[TheDamnCobraGuy]

Judging from this

Maximum Horse Power 400-600 HP

I'm going to go out on a limb and say that it is either a Master Power GT45, or a eBay Brand one, those aren't actual GT45's, a real GT45 can support 1100+.

Also the wheel specs.

Exd. Wheel

84.20mm

A real GT45 is 108mm.

Ind. Wheel

73.60mm

A real one is 80.8mm.

For road racing, a GT30R would be good.