Nope. Im doing a few more little things to my car and then retire it from daily driven duties and making it a weekend car. Gonna get a beater and put the modifying hobby aside for a bit so I can start saving for a house.

 

how does this 46 trim compare to the hahn turbo?

 

I assumed VE was ~100%, probably a little lower at low RPM and higher at high RPM.
The points are plotted starting at 2000RPM, 3000RPM, 4000RPM, 5000RPM, 6000RPM
Air flow: 6.5lb/m , 9.7lb/m , 13.0lb/m, 16.2lb/m, 19.4lb/m
Pressure Ratio: 1.0 , 1.55 , 1.55 , 1.55 , 1.55

*The plots and numbers rough estimates for the 2.4L.
I am pretty sure I calculated these correctly, but
please feel free to add any comments or correct me if I am wrong.

 

i dont really understand the maps but the 46 trim looks like its more of a flat progressive climb in power and the gt28 is more of a straight climb....i could be reading them wrong i have no idea....which turbo would be better? the 46 trim or the gt28?

 

The plots show the demand of the engine for air throughout the RPM range. Then we overlay the demand onto the various maps. These turbos are all decent fits so the plot in on the chart the entire time, which is good.
My only concern with the T04E 46 trim is that it get close to the surge limits which is bad.
The reason the LSJ can run the T04E 50 trim is because they are boosting ~20psi and we are only boostin ~8psi that brings the Pressure ratio up from 1.5-1.6 to 2.4 see how this changes the chart I plotted.

This is an example of a poor turbo choice for our engines!

 

ok i see what you mean....so the 46 trim wouldnt be a very good idea....which turbo would i be better to go with then?

 

Well that depends on how much $$$ you want to spend!?

 

lol sadly yea it does....id ike to keep it under 700...if thats at all possible....any recommendations?

 

Garrett T3 w/ super 60 trim would do nicely and aren't badly priced.
See Ebay item: 110202820266

Otherwise you can pick up a new GT2860RS for ~$1200
Garrett has the 2.4 partial kit w/manifold and turbo for around $1900!

http://www.turbobygarrett.com/turbob...letCobalt.htm#

 

good luck with the turboing, you're gonna love it. I'm running about 8-9 psi right now and plan to up that a bit soon.

 

you wouldnt consider this turbo to be outdated or anything of the sort would you? the auction says its only good for 300hp max..i dont want to be maxed out right away

i notcied the solstice 2.4 werks kit is using a 50 trim...they dont seem to be having any problems

[QUOTE=Red2.4SS;1738770]Well heres the deal about hp and flow. If you are leaving the internals stock you can only boost about 8psi stock and up to 10-12 if you have a great tune and are brave!
That will give you about 280-300 BHP (crank) @8psi. The flow at 100% volumetric efficiency at 6000 RPM is about 19.5 lb/min or 254 CFM, this is because the engine only draws in air once every two rotations!

It looks like you would be fully spooled by about 3000RPM.
I can chat more tomorrow, feel free to ask away.[/QUOT

ive been looking over these maps and im tryin to figure out where you got the 19.5 lb/min, 254 CFM from?

 

All it said about the werks kit was a "50 trim" it doesn't say which turbo housing? T3,
T3/T04?

The T04E 46 trim seems like it would be good for you @ 8-10psi. If you are planning on building the engine and boosting a lot more than that then, yes a larger turbo would be needed. Just remember that bigger isn't always better.

254CFM ~= 19.5lb/min of air
Remember the engine only draws in air once every two rotations (four cycle engine)
This I calculated @ 6000 RPM a 2.4L engine @ %100 Volumetric Efficiency will draw in
(2.4L*(6000RPM/2)) = 7200L of air per minute
7200L = 254ft^3 ~= 19.5lb of air

 

o ok...i was just wondering...yea the werks kit uses a t3/t04e turbo...not sure of the exact specs on it though...what problems would i run into if i went with the 50 trim?...which ive seen a few different sols using...?

 

Hahn is using the TD05H-16G for the 2.4L solstice kit. That compressor map also looks good for our engine as should be expected. Do you have any links as to who is using the T04E 50trim? I just think it is to big for the 2.4L stock.

 

i dont have any direct links but i have been talking to a person on the sol forums...zzzibyl i think it is...and the said that they dont have any complaints with, as well as the few others who bought the werks kit

 

You do realize the LE5 is good for about 380-400whp. You dont need to touch the engine itself if your going to go with a bigger turbo. You may want to drop the compresson but thats about it. Oh and swap to the LNF cams seeing how they are much better for boost.

Also 20 lb/min of air will produce just under 200hp. Instead of trying to calculate what your compressor will make then try to determine from there, why dont you calculate how much air you will need total for your HP Goal then pick the compressor based off that. It just looks like you guys are making it a lot more difficult then it really is.

 

i figured i would need roughly a 450-550cfm capable turbo. i wish to push 300-350hp...not if thats correct but thats what i got

 

Its easier to use HP to calculate the lb/min then find a turbo that can support that flow. most compressor maps are lb/min. Im sure you've seen others but i've tried to make turbo calculations easier here. That should help you pick a turbo without much confusion or doubt.

 

i tried to use it but i forgot i dont have excel. I plan to push out around 280-290 for starters and then up the boost later on maybe after some engine building. I think ive pretty much decided on a t3/t04e seeing as thats what the sol members are using and having no problems with