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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 09-15-2014, 02:30 AM   #1
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Default Next Catfish Engine Build

I'm building two engines, actually. #1 is a 1.8 NA8 that will be replacing the NA6 in the Catfish now. The car will be going back together, cleaned up and will end up in Seattle. Not exactly roadster weather, but I'll be putting seat heaters in.

The turbo is for:
1999 engine
Supertech springs and +1mm over valves
84mm 9.5:1 pistons
forged con rods
polished crank
Happy Meal and light weight flywheel
Exhaust TBD
700cc Deatschwerks injectors
IC setup

The logical choice for an all-around turbo seems to be the T2560. My question; what setup would make you think about using something else?

How about a GT2835 with .63 A/R and a V-band exit?
Or a GT3037 with a .63 A/R?
Or...?
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Old 09-15-2014, 02:49 AM   #2
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Originally Posted by cordycord View Post
The car will be going back together, cleaned up and will end up in Seattle.
Are you moving or selling it to someone up here? If you are selling, make sure the new owner makes himself known to the PNW crowd!
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Old 09-15-2014, 11:40 AM   #3
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The logical choice for an all-around turbo seems to be the T2560. My question; what setup would make you think about using something else?
EFR6258 for obvious reasons.
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Old 09-15-2014, 12:00 PM   #4
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oh man this sounds like it will be a hoot

I'd skip the dw's and go with ID's. also turbo choice will depend on power goals. I highly doubt anyone is crazy enough to really need something bigger than 2560 on a catfish, but who knows. it would be either gt2560r or efr6258 IMO. If you want a fancy garrett I'd look at the gtx2863 or something, with a tial housing.

Last edited by 18psi; 09-15-2014 at 12:20 PM.
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Old 09-15-2014, 12:12 PM   #5
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EFR6758: for doing rolling burnouts in 1st through 5th of a 6-speed.
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Old 09-15-2014, 09:54 PM   #6
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Are you moving or selling it to someone up here? If you are selling, make sure the new owner makes himself known to the PNW crowd!
The Catfish is staying in the family...my sister said she'd take good care of Catfish #1.

I'm building a mild NA8 engine and putting on the same 2560 Churbo system on it. Boost will be turned down, and seat heaters added. It will probably also end up being the first car with a full width windshield.
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Old 09-15-2014, 10:21 PM   #7
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Originally Posted by 18psi View Post
oh man this sounds like it will be a hoot

I'd skip the dw's and go with ID's. also turbo choice will depend on power goals. I highly doubt anyone is crazy enough to really need something bigger than 2560 on a catfish, but who knows. it would be either gt2560r or efr6258 IMO. If you want a fancy garrett I'd look at the gtx2863 or something, with a tial housing.
Okay here's the deal; I'm looking at testing out a new turbo manufacturer who doesn't carry the 2560. However, they do have the following:

GT2835 0.57 or 0.72 a/r
GT2835 0.63 or 0.82 a/r and stainless steel body
GTX2860R 0.57 or 0.72 a/r
GTX2863R 0.57 or .072
GTX2867R 0.57 or 0.72 a/r
GTX3067R 0.63, 0.82, or 1.06 a/r
....many, many more choices...

These are not Churbos, and the "X" models have actual Garrett CHRA's. None are internally wasted, and the default among all are V-band mounts for hot-side connections.

Now that the toy box is open, what do you bolt to a mildly modded 1.9? Here's the caveat; I drove home from Laguna Seca wishing that the 22 year old 1.6 had been fun and REALIABLE for the whole weekend. If 300whp can be reliable with a fully forged engine, then that's what I want.
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Old 09-15-2014, 10:24 PM   #8
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I just got a boner from that list. gimme a few min I'll clean myself up and try to provide more opinions
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Old 09-18-2014, 11:53 PM   #9
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Default here's what I think...

This is a tough crowd at MT.net, and you'all are afraid to voice an opinion because it will immediately be shot down. Don't fret, as I've already made a decision....BUT, I wanted to know what you'd put in your own car.

Remember, this is a track-oriented build, and not a dyno or drag queen---did I just say that?

The one thing that I'm grappling with is the fact that this build will happen without an internal wastegate. In performance terms that should be good. In terms of fabrication, that brings up questions.
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Old 09-19-2014, 12:30 AM   #10
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9.5:1 seems a touch high from what I've been told. 8.6:1 seems more popular. Also, if you want to consider running E85 you might up the injectors to 1000's and throw in a DW 300. Looking forward to seeing your build up. Your goals and mine are very similar.
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Old 09-19-2014, 12:39 AM   #11
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Originally Posted by TheBandit View Post
9.5:1 seems a touch high from what I've been told. 8.6:1 seems more popular. Also, if you want to consider running E85 you might up the injectors to 1000's and throw in a DW 300. Looking forward to seeing your build up. Your goals and mine are very similar.
I chose 9.5:1 at the suggestion of "someone who knows", and because I wanted the engine to work on its own before the turbo began to spool. E85 was never really on the list. My MSPNP2 can adapt to E85 maps, but I'd rather not have to plan out my gas station visits.

Luckily 300hp equals about 6:1 horsepower to weight ratio--even counting my lard ***--so huge horsepower isn't so important.

edit--BTW, I found out today that my engine builder lost my Happy Meal...
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Old 09-19-2014, 12:46 AM   #12
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I'd go with a bigger turbo and less psi for a track car. Thanks for the T shirt at MRLS!
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Old 09-19-2014, 02:04 AM   #13
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I chose 9.5:1 at the suggestion of "someone who knows"
They don't know jack **** about turbo pump-gas BPs, then.
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Old 09-19-2014, 02:15 AM   #14
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They don't know jack **** about turbo pump-gas BPs, then.
He is actually more of a Rotrex guy.
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Old 09-19-2014, 10:25 AM   #15
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I saw no mention of the GT2871.
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Old 09-19-2014, 10:30 AM   #16
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Probably because the selection he has to choose from most are cooler newer designs of that turbo.
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Old 09-19-2014, 10:54 AM   #17
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GTX2867R and low boost because you bought the wrong pistons.

Smaller turbos that would spool faster need to make more pressure to achieve the same power but make more heat. You can't handle as much heat because you chose a higher compression piston. Therefore your car will be a slower spooling compromise.

For a serious car, I would use the 2867 at high boost with the lower compression pistons. And if it was track only, i'd consider e85.
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Old 09-19-2014, 11:16 AM   #18
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Quote:
Originally Posted by y8s View Post
I saw no mention of the GT2871.
The GT2871R is available, including a 3" outlet model, 0.57 and 0.72 a/r

There are turbos available with T3 mounts too, which means that some off the shelf manifolds would be avaiable
GT2835/GT3071R with GT2835 T3
GT3037
GTX3071R using a GT3037 T3
GT3076R using a GT3037 T3
GTX3076R using a GT3037 T3
GTX3576R using a GT3582 T3
etc. (much bigger available..)
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Old 09-19-2014, 11:27 AM   #19
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oh c'mon guys, seriously??!!

gimme a break.

9.5 vs 8.6 and now the engine is next to useless? I realize all the track 1337's look down on us street car peasants, but to go this far is getting ridiculous.

This thing is light. really light (less load and heat). it will have rods. stock pistons are good to AT LEAST 300whp, and if the rest of his setup is really efficient and capable, this thing will be just fine with the 9.5's.
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Old 09-19-2014, 01:18 PM   #20
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Quote:
Originally Posted by sixshooter View Post
GTX2867R and low boost because you bought the wrong pistons.

For a serious car, I would use the 2867 at high boost with the lower compression pistons. And if it was track only, i'd consider e85.
This is my choice as well. I have played with most of the compressor options and to me the 67mm GTX style matched the turbine the best. Better spool than both the 60mm and 71mm. Plenty of top end power available too. Great for lower boost for your 9.5:1 build and better if you add race gas/E85 and turn up the wick.
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