Sizing the turbo compressor

[ezrollin]

After doing some some compressor map comps. I conclued that a t-61 had the highest efficinecy for my 3.4 (93-95) 15 psi @ 6000 rpm, to be used as a hp street engine. Anyone's input is welcome !

[rickykline]

10psi with my 60 trim is easily achievable at 2800 rpms...

[Guest]

a 35R is probably better then a 61

[ezrollin]

Isn't a 35R a ball bearing turbo,about $1500 ? Actually of the turbos I checked the t61 had the highest % of eff. but I there are other factors to consider,Like where do I want my boost to kick-in,goal was 400 hp. My pr for 14.7 psi is 2.0 (15 psi is 2.02) airflow is 43 ib/min. The to4e 57 looked good too.

[Guest]

you can get the 35R wheel without the ball bearing option. Saves you some money. about $500 or so.

precision turbo sells them. So does full race. i think full race sells it under hte T3/61 Precision sells it as the SC6152E

[timg]

The T series are all older, less efficient designs. Be very careful with the terminology and similar names of many turbos. If you want something cheaper than the GT series of turbos, but with most of the performance, look for the GT series compressor wheels combined with an older T series turbine in a typical T3 or T4 setup. Here are some examples. For under $900, the first two are my favorites.

GT35R compressor wheel in non ball bearing combined with a T4 turbine

http://cheapturbo.stores.yahoo.net/gat4b.html

Same compressor, but with a T3 turbine

http://cheapturbo.stores.yahoo.net/t3b.html

Older T3 and T4 turbines combined with the older 60-1 compressor wheel

http://cheapturbo.stores.yahoo.net/gat3w82ar.html

http://cheapturbo.stores.yahoo.net/garrettto4s601.html

Tim

[timg]

Isn't a 35R a ball bearing turbo,about $1500 ? Actually of the turbos I checked the t61 had the highest % of eff. but I there are other factors to consider,Like where do I want my boost to kick-in,goal was 400 hp. My pr for 14.7 psi is 2.0 (15 psi is 2.02) airflow is 43 ib/min. The to4e 57 looked good too.

The 57 trim T04E is too small for 15 psi on a 3.4L motor. My calculations were showing about 54 lb/min at 6500 rpm and hitting 43 around 5200 rpm.

I've seen the GT35R from reputable dealers for as low as $1199 shipped. Check Honda-Tech for awesome deals on turbos from their sponsors.

Tim

[nocutt]

Look for hybrids* if you do not want to spend money on overpriced and overhyped* turbos...go to precision (PTE, amongst others)...they tend to use the newer internals with journal bearing hairdriers...