Turbo Upgrade Thoughts

IGOTASTi

System Operator
Staff member
This is getting good. :)
 

Vermont

New member
You're right, to bring it back on topic... Compressor charts will tell you more about what turbo you want. You want something that flows well at low drive pressures. Most turbos are made for higher drive pressures, and as a result make crap for power on a Subaru running 93 octane.

Yes but OP is asking us because he would have zero idea on how to read a compressor map.... What the OP would like is a suggestion for a good Small-Medium sized turbo to get him into the 350-380whp range on pump gas. Then it is most common to also follow up with why you think said turbo is good for his application. You stated the FP Green with HTA upgrade but did not follow up with any reason as to why except that it flows good. Hell a Borg Warner EFR 8374 flows great but would have way to much lag and would not be in its efficiency range due to his goals. In this situation over shooting his power goals are worse than under shooting them.
 

microsnook

New member
Yes but OP is asking us because he would have zero idea on how to read a compressor map.... What the OP would like is a suggestion for a good Small-Medium sized turbo to get him into the 350-380whp range on pump gas. Then it is most common to also follow up with why you think said turbo is good for his application. You stated the FP Green with HTA upgrade but did not follow up with any reason as to why except that it flows good. Hell a Borg Warner EFR 8374 flows great but would have way to much lag and would not be in its efficiency range due to his goals. In this situation over shooting his power goals are worse than under shooting them.

This is getting good! haha.

I can't say that I know how to read a flow chart, but definitely would like to understand it. Thats me doing research on my part.

Yes, shooting under my power goals is definitely better than going higher in my case.
Simpler the better.

Really thinking about the DOM though :)
Just need to save my pennies
 

Vermont

New member
This is getting good! haha.

I can't say that I know how to read a flow chart, but definitely would like to understand it. Thats me doing research on my part.

Yes, shooting under my power goals is definitely better than going higher in my case.
Simpler the better.

Really thinking about the DOM though :)
Just need to save my pennies

If you do end up with the Dom 1.5 Then I would highly suggest getting it from Jordan@ Defined as he is the only person right now who can get an EWG bracket made for it, for cheap. Other wise if you want to use an EWG (and I would highly suggest using an EWG especially on pump gas) you will need to weld it shut, which is very stupid....
 

microsnook

New member
Someone just posted over at nasioc that they might be getting rid of their 1.5 because they want something bigger. This definitely sounds nice to save me a little bit of money.

He said it has a 3" inlet, ceramic coated, 10cm.

I don't know if this will fit with my current set up or not?
From what I read the 8/10cm spool wasn't too different from each other...

I just need to know if this will fit! haha.

And if I ordered the Dom 1.5 you said I should get it from Jordan? Couldn't he just make me a EWG bracket if I bought it from another forum member?
To save me the money from going brand new...

Thanks again guys
 

Grinder34

Track Monkey
So, others may disagree, but a turbo is one of the things I'd get new. I know it's cheaper but unless you really trust the guy selling it, i feel like its too big of an unknown for me to want to gamble on getting used.
 

microsnook

New member
Thats what I was thinking. That I should just get a new one and put out the extra bucks. Not sure how well I trust the dude.
 

Vermont

New member
Some things you can do to protect your self with buying turbos. First off check out his reviews and account history. If he only has 2 posts on a 5 week old account then you should probably forget it. Next require pictures from all angles. Then if it still looks good to you, have him send a video time stamped video (with the date and your user name hand written on a piece of paper) of him playing with the input and output wheels to check for play in them. Any movement up, down side to side is bad, they should spin round and round with out any heavy resistance and that's it. Anything else shows wear on the bearings and is a no go. Also any noise is bad, it should spin around quite as can be. Any scrapping, grinding or rattling is a no go.

I just did this my self for a member on IWSTI.com as I was selling my VF48 that I had replaced with my Dom 1.5. A used turbo can be a great option depending on the price and mileage on the turbo. If you doubt the millage on the turbo then ask for a odometer reading of the car (time stamped pic). this should give you a good idea on how many miles on it right now and then you can usually trace back their post history to find when and at how many miles they installed it. But honestly this is for if you are paranoid like me.

I would advise not to buy off NASIOC. They have serious problems with scammers and people lying out their ass on parts... IWSTI.com is a much better place for STI parts than NASIOC. Good rating system and a lot less scammers. On the flip side less parts too.
 

Vermont

New member
A;sp just FYI. If you do decide to go with the 3in inlet then you will need to go do TGV deletes to make it fit. I have the 8cm because I am obsessed with spool the 8cm will only start to become a problem if you run E85 as it loses breathing room up top. As far a spool differences there was only a 200-300rpm difference between the two. The 10cm seemed to breath a little better up top but that was it, and even then only on E85 from what I saw on the different dyno plots.
 

microsnook

New member
Ok, Im not sure how soon I would even be able to do this, but I did send him a PM just to see what he has to say. Ill definitely keep in mind everything you told me and make sure you post back with the results of everything.

And I was thinking about doing the TGV anyways :D
 

microsnook

New member
I have another question!

Since I will be upgrading on the stock block, eventually, what would be the next step as far as making the block stronger? Some pistons? Rods?
I found a nice set of used pistons for a decent price that I might want to pick up. CP 100mm. Any suggestions on these?

Thanks
 

Grinder34

Track Monkey
Pistons, Rings, Rods, Bearings, Cams, Valves, port jobs, etc... are all things to consider. Do you just want to make your engine a little "stronger" or planning on pushing everything to the limit?

http://www.igotasti.com/vBforum/showthread.php?230-EJ257-Building-up-the-heads There is a little reading about JUST the heads. Take a look at what Crawford puts into their performance heads, as an example:

Crawford Race-Prepped Heads: $4,400
- Record setting, track proven, dyno tested race heads
- Custom hand-ported and polished heads
- New Subaru OEM castings
- 5-Angle Intake Valve Job
- 5-Angle & radiused Exhaust Valve Job
- Inconel Exhaust Valves (2,400 degrees maximum)
- Stainless Steel Intake Valves (1,800 degrees maximum)
- 4130 Chromely Retainers
- High Power / High Torque Performance Valve Springs
- Hardened Steel Spring Platforms
- All heads are serialized

To stick with the Crawford theme for now, check out the kinds of things they include in this package:

http://store.crawfordperformance.com/store/products/37

- Forged, Lightweight, High RPM Long Rods
- Forged Lightweight Pistons
- Case Hardened and Heat Treated Wrist Pins
- New STI High Performance High Mileage Piston Rings
- New High Performance Clips
- New High Performance Bearings

As for specifics, I'll let someone else chime in.
 

microsnook

New member
Well I wanted to stay as stock as possible and not go all out. So essentially it would be just to make it a little stronger and NOT push the engine to its limits.

I was asking because I saw the pistons and they were a good price, so I figured maybe that would be a solid first step in making it a little stronger.

I did go through that first link you sent me a little but all of that is super expensive. My goal is all on a budget ;)
 
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