Ok - so within the past few years we have heard that there were issues w/ weak blocks in the 2005 engines. Now is there actual truth to this or is it false? I know of a few people in the past that had 05 and blew their block, but maybe there isnt as much truth to "its an 05 issue" - comment guys. lets hear the details. thanks,

 

05 tc, 2 years boosted. only problem i have is possibly bad rings. :/

 

I have my 05 TC boosted at 11 psi since October 06 (approx 46000 miles) and i have not had a problem at all. Just make sure who ever is doing your fuel management tunning knows what their doing. I have IHI VF22 at 11 psi and approx 290 HP to the wheels.
I got my turbo from www.tbkperformance.com you should check them out!

 

Olomoco, is your boosted tc a DD or only for track?
I need my tc for DD and afraid to go turbo.

 

05's dont have a weak block... however the newer 07+ engines do have oil squirters which probably will make them a little more reliable under boost.

 

well I was getting that from topics that we had back in 06. I lost most of the posts so its a hinderence to look up. I know that there were people blowing holes in the side of the engines (it was atleast a few people because I remember small bits).

 

I don't think 05's had weak blocks, they had crappy ROD/MAIN bearings that kept spinning and crewing stuff up. That may have been what you heard about weak blocks.

 

The block is no weaker than any Honda. They both have free standing cylinders, they are really only a problem if you are getting serious with the boost and hard racing. The rods in the 2az are skinny little beams, thats why they put windows in the side of blocks when abused. After market rods requre some grinding on one side of the block. The mains are offset to one side of the center of the cylinders, thats why the stock rods are so skinny. As for the deck, you can do expensive darton sleeves or something like in this pic.
https://www.scionlife.com/gallery/?photo=67135

 

whats sleeve cost?

 

I think dartons run 100 ea or a little more. machine work is the killer with them. For sleeves like I have its like 90 a hole machine work, and the sleeves are like 45 ea I think. I would have to check tomo for actual prices.

 

I believe the whole "05's have weak blocks" to be a myth fabricated by people that tried to build 500whp cars on stock bottom ends and ended up with a paper weight because they kept pushing the stock motor past its limits. With a built bottom end and a good tune with the proper supporting mods, these blocks can hold 500whp or more on stock sleeves. Myth busted.

 

bump

 

i did go through one block in my car, i believe it was my bearings and rings that caused it tho, it started just dumping smoke like crazy...

 

05 blocks are the same as 07 and up.. block is same but minor changes on the internals like oil squiters as mentioned

 

there were a ton of changes to the internals to the '07

here's a little sample:
http://tijil.org/Scion_Docs/Scion_06...er/2azfe15.pdf

now the block itself is fine, however as OC3RULZ mentioned above, there were issues with the bearings... specifically #1 rod bearing... there were plenty of instances of failure from that specific one.

it was mostly due to oil issues, thus the added squirters in the '07... as well as the change in oil weight in early 2006.

other changes to the 2007 were more for economic/performance type stuff.

 

Ahh - so for users knowledge reading this thread, which bearings and rods should be upgraded to safely yield a tC owner a 350whp car .....for a lengthy time? From what I gather, the pistons are rated over 400hp so they could be kept stock.... or maybe they shouldn't? My goal is to build knowledge on the topic of a 350whp build (not a ***** to the wall build - I know that once you go over that 350 mark there surely is more you need to start thinking about) Please comment on the engine (its a given that at that point you need a clutch upgrade also).

 

i say for a 350hp build you need, rods, pistons, bearings(all of em because oem is around the same price as callico coated), deff need fuel upgrade, pump, injectors, etc....thats about it...if i missed something someone will point it out

 

350whp can be achieved safely on a stock block and head with injectors, fuel pump, and aem fic or greddy ultimate and a good tune ( meaning no excessive timing advance or knock). Closer to 400whp youre going to start bending rods.

 

Ya tell me about it! lol many know that's what happened to me. The issue happened in 05 and some early 06 motors.

 

if i plan on keeping my car for a while more - im honestly thinking about getting as much done to the engine ...but things that i dont have to fuel manage yet. I dont want to go that step yet .... i will if i go FI - but if i dont ....then Ill just have a good car with a good engine. I like my tC and i am still not sold on any other car. Should I think about new pistons? If so I would want to stay around the same compression so i dont need to be tuned but are fine if ... if i go FI in the future of a year or two. I already have my clutch and flywheel replaced (and the limited slip installed) - so I have a quality car/setup. Can someone build me a detailed list of things I can/should upgrade all in one shot. Should the engine be coated? is it needed for a minus 350whp engine? I know rods and head gasket are a must. Can a few people build me a full detailed list of the total options so I know what im working with. Also, if I get tuned would i be able to safely raise my redline a small amount? Second gear I think could use a small amount more