Hey guys, I'm looking into buying a turbo for my 2.8L engine. I found one that I can get for cheep, Its a Garrett with a .42 compressor .48 turbine a T3 flange. The guy I'm getting it from says it looks like a stock Chrysler turbo. So I'm guessing its off of an old Labaron? What I want to know is will this size turbo work alright on my engine? I'm not looking to make too much power out of it, probably around 200 HP at the most.

Thanks,
Paul

I had one of those LeBarons......the turbo lag was nearly dangerous.

quote Originally posted by Big Paul: Hey guys, I'm looking into buying a turbo for my 2.8L engine. I found one that I can get for cheep, Its a Garrett with a .42 compressor .48 turbine a T3 flange. The guy I'm getting it from says it looks like a stock Chrysler turbo. So I'm guessing its off of an old Labaron? What I want to know is will this size turbo work alright on my engine? I'm not looking to make too much power out of it, probably around 200 HP at the most. Thanks, Paul

If it's a straight T3 turbo, then it's probably too small for the 2.8.

I went with a 50 trim T3/T04E for the 3.1 I'm building. I've since come to the conclusion that this is really too much turbo for that engine since the old gen ! and gen II iron head engines just can't take enough boost to take advantage of that turbo.

After looking at many compressor maps, I've pretty much come to the conclusion that the Mitsubishi 16G (either the EVOIII or the small 16G) with the TD05H turbine is very nearly an ideal choice for a 2.8. They're readily available new or used, and quite inexpensive compared to Garrett units.

quote Originally posted by TiredGXP: If it's a straight T3 turbo, then it's probably too small for the 2.8. I went with a 50 trim T3/T04E for the 3.1 I'm building. I've since come to the conclusion that this is really too much turbo for that engine since the old gen ! and gen II iron head engines just can't take enough boost to take advantage of that turbo. After looking at many compressor maps, I've pretty much come to the conclusion that the Mitsubishi 16G (either the EVOIII or the small 16G) with the TD05H turbine is very nearly an ideal choice for a 2.8. They're readily available new or used, and quite inexpensive compared to Garrett units.

By straight you mean the fins on the turbine correct? If the turbo is not a straight T3 then would it work good? Or do you think I should look at different turbos all together. Like the ones you mentioned.
Thanks for your help!

[This message has been edited by Big Paul (edited 01-08-2012).]

Using Garrett's Boost Adviser to look up your numbers, that turbo is too small.

For a 2.8L engine making max 200 crank hp at 4500rpm then you need 8.75 psi boost which equates to a pressure ratio of 1.62 (at 1000' above sea level) and a corrected non-intercooled airflow of 18.34 lb/min. Using the .45 trim T3 here: http://turbocharged.com/catalog/compmaps/fig2.html it shows it's too small. If you jump up to the .60 trim T3 off a 1983 Ford Turbo Coupe then you are in the middle of the compressor map and good to go.

quote Originally posted by Big Paul: By straight you mean the fins on the turbine correct? If the turbo is not a straight T3 then would it work good?

Bad use of language on my part - I was asking if it had a T3 compressor as well as a T3 turbine. Many turbo's have a T3 turbine combined with larger compressors from different turbo series (hybrids like the T3/T04E). The smaller T3 turbine aids spooling, but T3 compressors just don't flow enough air for the 2.8.

Here's a page with the various T series compressor maps - I wouldn't bother looking at anything other than the T04B or T04E series.
http://www.turbocharged.com...g/compmaps/fig6.html

Here's a good site on the Mitsubishi turbo's, with a fair discussion on analyzing which one you may choose:
http://www.stealth316.com/2-3s-compflowmaps.htm

Here's a rough plot of a T3 45 trim compressor. Obviously too small
http://www.squirrelpf.com/t...7=31.1&product_id=76

For a T04E 50 trim compressor - a bit too large
http://www.squirrelpf.com/t...7=31.1&product_id=57

And for the Mitsubishi 16G (small) - just about right
http://www.squirrelpf.com/t...w7=450&product_id=87

Here's the configuration I used to come up with these plots:
(link is too long, you'll have to copy and paste - remove the space after http)
http ://www.squirrelpf.com/turbocalc/index.php?version=4&target_peak_power=250&pr_ref=14.696&engine_disp=2.8&engine_disp_factor=0&target_af=11.5&bfsc=0.51&max_ic_loss=1.7&rpm_redline=6000&rpm_peak_power=4800&rpm_max_boost=3200&rpm_min_boost=2000&vol_1=78&vol_2= 80&vol_3=80&vol_4=77&vol_1=78&vol_2=80&vol_3=80&vol_4=77&intake_temp_1=80&intake_temp_2=100&intake_temp_3=112&intake_temp_4=115&turbo_n=1&map_sel0=87

Oh ok, I get what you are saying. Thanks for all the help guys! Those links are very helpful!