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largest turbo to run on kelford 272s?

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vr41mpg

10+ Year Contributor
38
2
Nov 4, 2008
Queens, New_York
I have decided on Kelford 272s on my 6bolt 2.3L for my weekend warrior.

My question is should I run a 64lb/min turbo or a 79lb/min turbo?

Both turbos are 1.05AR twin-scroll.

I plan to run anywhere from 30-40 psi on pump and rev up to 8k or 9k MAX on an automatic.


Is the kelford 272 in the efficiency range for these turbos? I think im going to go research how to read these compressor maps, LOL.
 
You really should be deciding on cams based on turbo and application rather than the other way around.
 
Well, from all the reading I have done on the forum, it seems as if the Kelford 272s are the most aggressive cams that have the most street manners. So that is why I feel like these are the ones I want.

Considering that to be true, I want to know if the 79lb/min turbo would be better suited with bigger cams, or if it would run well on the K272s. If it would be a stupid idea to put a 79lb/min turbo on these cams, I'll just go with the 64lb/min.

Everyone says go big or go home and that I don't want to waste my money just to find out I want to go bigger. I see people running the PTE 6262 on these cams so I think I should be ok, I just wanted to double check.
 
What turbos are you looking at that are 64 and 79 lbs/min? That's the potential of 150hp difference which becomes quite a lot at those levels.
 
Well, how much power are you looking to make?

Personally I'd favor the smallest turbo that will get you the power you want with a little cushion, expecially with an auto.

Well, how much power are you looking to make?

Personally I'd favor the smallest turbo that will get you the power you want with a little cushion, expecially with an auto.
 
My goal is to raise hell on the streets, LOL. Maybe ill bring it to the strip just to see what I can do with it, but not going to be competitive or anything like that... For the sake of my drivetrain, I will probably not launch it too often.

Borg Warner EFR 7670- 1.05AR Twin Scroll rated 400-650hp... (is this crank or whp?)
Inducer: 57.2mm, exducer: 76mm, Turbine Wheel OD: 70mm

BW EFR 8374- 1.05AR Twin scroll rated 500-800hp
ind: 62.6mm, exd: 83mm, turbine: 74mm


I think I am leaning towards the larger one. Originally I was looking for a turbo that I would be able to spool around 4 to 4.5k and rev to 8 or 8.5k.

The 8374 looks like it hits full power at 5k rpm on the Sierra Evo 2.2L but supposedly that was at high altitude with some prototype cams. So, I'm hoping on a 2.3 I can by 4500 or 4700rpm and ride it out to 8500 or 8700.
 
I dont have a power goal. My goal is to push the limits of reliability.


I may have to go with the 7670 just because of room in the engine bay since I want to keep my AC. I am waiting back on a few emails/pms in regards to this.



edit: i know im good with the kelford 272s. What im wondering is if they are good enough for the 79lb/min or should I just go with the 64lb/min
 
Even as comparably big as the TX272s are, they are a bit small for a 2.3.

Get the 280/276 and go for the bigger turbo.

You have the displacement to play with, and you can still wind a 2.3L quite high.
 
I was afraid someone was going to say that. :ohdamn:


I don't necessarily have to rev high, I meant I don't want to rev over 8500 for the sake of the drivetrain.

Arent the 280/276s going to be rough idle on the street?
 
Not on a 2.3. Get some gears play with the overlap.

If you are looking at ~65+ lb/min turbos you shouldnt be worrying about lope anyways.

Make sure the clutch isnt dragging, give her good fluids and wind it out.

I've been running stocking gearboxes past 9k for years.

If you are worried about the drivetrain, you should not have gotten the 2.3 which is going to churn out a ton more torque at the bottom end and mid-range. Thats is far more likely to break parts than stretching the redline a bit.

What rod bolts did you use on your 2.3 build?

Hope you are investing in springs.
 
Drivetrain is 2g automatic (ratchet shift, high stall conv, etc), kiggly beehives, arp rod bolts.

I just hate the sound of the 280 cams at idle, LOL. Maybe I can get over this. IDK.. now you got me thinking about the 64lb/min with the 272s.

So its basically

64 lbs/min turbo with kelford 272s
or
79 lbs/min turbo with kelford 280s

because
79 lbs/min with kelford 272s is not a good idea, right?
 
I don't know what kind of intake manifold you have but I would just get the kelford 272's, the 7670 and a jmf drag or magnus cast. I'm running a stock intake manifold on a 2.3 with 272's and a 65ish lb/min turbo and I can definitely tell the intake manifold is holding me back. You should have no troubles making mid 600whp wheel and I believe the spool will be much quicker which is important on the street and especially with automatic.
 
Just remember you have more motor with different piston speed and dwell times than those cams were intended to be used with.

You can run either turbo on either cam, but you should take full advantage of the motor you have and compliment it with the bigger turbo and a cam that suits them both.

If I were going to run the 79lb/min turbo with a big turbine wheel and housing on a 2.3L I would even start looking at the 288 or 292s and get the most out of it.

That may sound extreme but remember the advertised duration was meant for the 2.0s

Edit: thecman02 raises a good point.. what are you doing in terms of intake and exhaust manifolds?

What size exhaust? How much power do you aim to make?

Because that will determine how much wastegate you need, among other items.

there is a lot more to this than just the turbo and cam.
 
Old motor fp272s gt4294 2.4- 621 on 30psi pump gas very low timing

New motor kelford 272,kigglys, billet gt4271 jb, 2.4.

Its a full interior street car.

Automatic helps with big cams at idle while street driving. Guys have made over 800 on hks 272s.
 
I have decided on Kelford 272s on my 6bolt 2.3L for my weekend warrior.

My question is should I run a 64lb/min turbo or a 79lb/min turbo?

Both turbos are 1.05AR twin-scroll.

I plan to run anywhere from 30-40 psi on pump and rev up to 8k or 9k MAX on an automatic.


Is the kelford 272 in the efficiency range for these turbos? I think im going to go research how to read these compressor maps, LOL.

On my 1g AWD Auto Im shifting at 9k without any issue. Im using the Borg Warner s372 with race cover. Im not using as big of an A/R as you plan on using.

My goal is to raise hell on the streets, LOL. Maybe ill bring it to the strip just to see what I can do with it, but not going to be competitive or anything like that... For the sake of my drivetrain, I will probably not launch it too often.

Borg Warner EFR 7670- 1.05AR Twin Scroll rated 400-650hp... (is this crank or whp?)
Inducer: 57.2mm, exducer: 76mm, Turbine Wheel OD: 70mm

BW EFR 8374- 1.05AR Twin scroll rated 500-800hp
ind: 62.6mm, exd: 83mm, turbine: 74mm


I think I am leaning towards the larger one. Originally I was looking for a turbo that I would be able to spool around 4 to 4.5k and rev to 8 or 8.5k.

The 8374 looks like it hits full power at 5k rpm on the Sierra Evo 2.2L but supposedly that was at high altitude with some prototype cams. So, I'm hoping on a 2.3 I can by 4500 or 4700rpm and ride it out to 8500 or 8700.

Come link up with me!

The only thing with the bigger turbos and the autos is the TC. Its hard to get it to stall high without n2o but I think I fixed that lastnight seeing over 4k on the foot brake with no n2o.
 
Last edited:
I wont be street racing. It will be 3" from the turbine outlet to the muffler tip.

Either going JMFab top mount GVR Twin scroll T4 Manifold or Full-Race TS T4 with the MVS or MVR wastegates.

I think I have my heart set on that Magnus v3 Cast with a Q45 TB.

And let me put it this way...

I realize that I will not be maximizing the full potential of the 79lb/min with the kelford 272s.

However, will the 79lb/min with the 272s outperform the 64lb/min with the 272s?
 
DWR what cams do you use?

@landspeed... I am not trying to set a land speed record :)
 
I understand, I just know how these things start to snow ball and I am trying to save you the money on the pricey bits so you'll have more room to grow and still have fun in the short/medium term.

With that much motor, those intake and exhaust manifolds, a 90mm TB, etc. just go for the 79lb turbo and a cam that'll make power to 9k where you're in the fat part of that compressor map on full boost.

Those Gamma-Ti turbine wheels with a ball-bearing center section are gonna make great torque with excellent transient response and huge top end on the ~80lb/min wheel.

I think you will appreciate what I am saying once you drive a setup like that. Besides as an auto.. you only have to spool it once.

Get the right converter after you've sorted out the rest of the setup and you'll have a mild-mannered monster.

Just my 2psi.
 
"Automatic helps with big cams at idle while street driving."

Why is this so?
 
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