Hey,
I am looking to upgrade my turbo. I have been boosting a disco potato for years to its max and it finally failed on me. I had the CHRA swapped out by Garrett and plan on selling the redone turbo to a buddy and going a bit bigger.

Right now I am having to use speed based boost control to keep the low rpm tq from roasting the mt et streets (w/quaife lsd) so I feel like I could step up a frame size with no low speed losses what so ever.

The motor is sleeved with a 9.2:1 cr.

3" exhaust.

Manifold.
http://img828.imageshack.us/img828/8920/passside.jpg

I am looking to make 450hp minimum maybe 500+. Current turbo is GT2860RS laying down 353bhp.
I was looking at a GTX3071r or GTX3076r. Good idea? Your thoughts?

 

3076 is an awesome choice but there is something called the silver surfer which is a custom made turbo from stc that i think is right up your alley.

https://honda-tech.com/forums/forced-induction-16/my-b18c1-engine-build-assembly-2951496/

check this thread out and see what u think. surfer is my next snail for sure.

 

353bhp GSR with a GT28 must be one helluva fun car to drive around!

 

Prob has a really nice powerband. I wouldnt go much larger. Going to completely change the characteristics of the engine.

 

but for 450 and the elusive 500+ he will definately need some lbs/min.

 

Yes in deed. Op needs to decide 450 or 500+ because properly sized turbo will be best. 500+ is going to make it a top end beast

 

It is a hell of a lot of fun, that is the truth. I honestly do not want to loose that fun but have too much down low and have to use traction control to keep the tires on the ground down low. So my thinking was that I could step up a size, fit that low end curve a little better, and get some free top end.


This is a slightly lower power pull. I don't have the higher one online but its pretty much the same just taller.


Car also has a cat on it for emissions...
Also stuck with a t3 input and 5bolt output flanges. My disco has an ATP hotside so anything I get will need to stick with that format. I can have the downpipe cut and vbanded if you guys tell me I have to but I would rather not if possible.

While I was at the turbo shop the other day they were telling me the gtx3071 would spool up almost as fast as a gt2860. They told me to go with a .62 AR but I saw somewhere that a 3071r with .62 in the atp t3/5bolt housing would have too much back pressure so go with the .82.

They also told me to look into a gtx2868 ??

I don't want to screw this up.

Whiterice I will def look into that turbo. Thanks for the suggestion.

 

^^^nice looking powerband

 

Thanks

OK lets say I am aiming for 450.

I am thinking the cat will have to go. Seems to hold up just fine right now but I am not sure it can handle 450 without melting down...

Do the GTX turbos have the same CHRA exchange program as the GT series?

 

Why don't you run a gutted cat? If its a 94 you shouldn't have to do actual emissions testing just have the equipment still on the car. The surfer is def a turbo your should look into. A lot more responsive than other turbos in its power range from everything I've seen.

 

I moved to Colorado. They put the cars on rollers and actually run it up to 60mph...

Your lucky if you get someone who wants you to pass. Usually you get an excited kid who wants to boost your car when on the rollers as much as possible.

 

Precision has some Garrett upgrades that i've used and have worked out really well...keep them in mind.

http://www.precisionturbo.net/turboc...replacement/20

 

i always get confused when i look at dyno charges based on mph vs. rpm ...

hum...honestly think you should be able to find a turbo that would perhapse take 300-400rpms longer for full spool, loose 3-6% power across midrange but definity make up for the extra 100whp above say 5400rpms...

Not sure if that makes sense or not...


Maybe the GT3255b might do 450whp but that's pretty much maxing it out.

The silver surfer will do 450whp... maybe 18-19psi, that turbo maxes out at about 530whp 26psi or so..

if you'd like to run a slightly larger turbo which will allow you to make 450whp at lower boost like 15-16psi but still hit 500whp then go with the GT3540e/s turbo.
that's what i have on my EF gsr (stock) 10psi 320whp full boost right at 4500whp.
Next month i should be retuning with nicer FIC 1100 injectors and E85 so should do 380whp with easy.

I'd talk to mac about the surfer.

 

Get a Silver surfer ! You won't be disappointed ! Pm TheShodan for info. https://honda-tech.com/forums/members/theshodan-999301704/

 

The surfer is a great turbo but if the op wants to stay within the same line of turbos th gtx3076r is the way to go. Same chra as the gt the denotes a billet compressor wheel

 

Yea i agree with TUrbo -Ls....If OP has the funds definatly go with the gtx3076r.

 

The GTX3071 outperforms the GTX3076. The GTX 71mm comp wheel can max out GT30 turbine. You need to step up to a larger turbine to make use of the GTX 76mm comp wheel. I vote for the GTX3071 for him.

 

Waits for mac to chime in

 

Good to see another PFI tuned car on here. Looks good! Did Brent tune it?

 

Funny guy. And the thing is, I haven't been on in a couple days.

Unfortunately, no. You must purchase a new turbocharger completely in order to upgrade to the GTX turbochargers.

For 450whp, I'd stay in the 52lbs/min to 60lbs/min category, as anything higher would put you in GT35R territory and would change the effective response of what you like so far.

What turbine housing, wastegate and flange combination do you have? I'm sure we'll stay in the GTR series of turbochargers just for ease of integration with what you already have.

Please, if possble, show some pictures of what you have. It doesn't have to be of your exact turbocharger. some likeness will do, as long as it shows multiple angles.

 

OP, how did the turbo fail? My GT3076R went out just short of 20k miles. Something caused it to get starved of oil and the CHRA was a total loss. I've got a new CHRA in my old housings and so far it seems fine. Just curious how many miles you got and how it failed.

I've always loved my GT3076R for a daily driver. I run 17-18psi on 93oct which is good for north of 400whp. It made 550whp on 113 leaded at 25psi.I'm actually thinking about putting a Precision billet journal bearing 5557 (535hp) on my s2000. The $900 shipped price tag got my attention even though it's not dbb.

I've found that lag isn't always a bad thing when you're making 500whp on a fwd with regards to traction.

 

Thanks for the replies. I'm working out of state and have the slowest internet possible. If I miss something its not intentional.

Yup Brent from PFI tunes it. I feel confident with him behind the tune.

I'm not really sure exactly why it failed but I'm going to cover all angles in case its something that will effect the new one. We do have a pretty good guess. About 9 months ago I got pulled after hauling *** through the mountains... He caught me going 5 over (luck) but pulled me anyways. I assumed that he knew I was sliding around corners and was pissed but I ended up with no ticket and a lot of compliments. I shut down without a cooldown. It ended up overheating the drain, kinked it, and was blowing oil through the seals for 15 miles. Next morning I took the car out and realized it when I produced a smoke screen. It seemed fine but I could tell something was up bc it was progressively taking less time to stop spinning after shutdown. There was zero notice between working fine and depositing metal on the housings. They suspect the damage happened that night and took a while to show its ugly face. I got tthe urbo used and we both beat it up. No idea about milage but I know I put less then 5k on it. I've had it for 6 years at least. Not daily driven but when it is driven I make sure to make the miles count

 

I tried to pull up atp website but the net is just too slow and def too slow atm for pics.

I have the atp t3 5 bolt external wastegate turbine housing. I think the rest is a standard potato. I can have a vband welded to the downpipe if I need to but would rather leave it as is. I have a recirculated dump so changing that side might cause a headache.

 

Also it has a tial waste gate I think 38mm?

Has anyone heard that backpressure on my turbine housing would be a problem with a 3071 with .62 ar?

As far as the chra exchange program I am just curious because that program is what keeps me a Garrett customer. I don't want to step up to the gtx if they don't offer it and I'm not worried about cost if what I'm getting in the end is quality. I've played games with a lot of different turbos in the past.

 

How is PFI and Brent L doing?

That guy was the reason I fell in love with honda tuning/turbo set ups back when I was 16. He was still starting PFI up from out of his basement at his house in Loveland. (14 years ago lol)

He did some work to several of my cars back when I lived in colorado, stand up dude

Sorry dont want to thread jack here.....