Must build if using GT2871r?

[Gmac03]

As the title asks, I have a very nice GT2871r laying around and as my MS3 currently hits 51k, I'm looking to do this with when the expired powertrain warrantee goes away.

I'd be using the GT2871r with the ATP 3in intake and exhaust and oil lines.

Us a COBB ap tuned by a local buffalo company, innovative tuning.

And run a Perrin PWI-1 meth inj, to lower temps internally and hopefully keep it all safe.

Now the big question would be do I need to build my engine for this setup. I'm not looking for anything outrageous, but I do want to keep the turbo happy and put the boost within it's island on the compressor map.

I've searched a ton and there is obviously no definitive answer on this, but it seems if we tune it to move the power curve further back in the rpm's, which it would because of the larger turbo and greater turbo lag, then this would help.

I'd like everybodies opinion though.

Thanks.

Gmac

 

[rmgedon69]

you might as well...

GT2871r is capable of what...400 - 500 hp?

i think you should (sooner than later) for longevity and reliability purposes. might as well go all out...know what i mean?

 

[Domino81]

Anything beyond 350whp scares me with stock rods.

 

[Gmac03]

My only issue with building the engine is I don't want the down time with this car, I have a nice third car right now that I'd have no problem driving around, but still I don't want the car down for a couple of months.

And when and if I built the engine, I would find it hard to just do the rods and pistons. I'd like to do a full build, minus maybe sleeves (own personal opinion). But I don't think the aftermarket is out there for our cars engines, not yet atleast, ie cams, valves, guides, retainers, springs, crank, crank scraper, etc.

And now I get in over my head and I'm looking at another 6,000 into a engine. I've been there and though it's nice, you really never want to drive your car any more and I'd want more power then that gt2871. Haha, what a mess.

Can the engine handle a GT2871? I guess that is the question.

Gmac

 

[Gmac03]

Anything beyond 350whp scares me with stock rods.

I've heard that as well. Can't seem to find any proof other than, zoom zoom boom. I'd like to know why they throw a rod.

Saw your car yesterday on Taft, sounded good.

I'll have to meet up with you sometime, check it all out.

Gmac

 

[rmgedon69]

Can the engine handle a GT2871? I guess that is the question.
Gmac

sure it can...but you won't be able to use it's full potential. you'll always be watching all your sensors and guages so you won't see your internals out of the engine block. i don't think you would like not having the full benefits of a much bigger and stronger turbo.

for me...it's like knowing there's a cookie in the cookie jar but i might break the jar if i reach for that cookie...lol...or something like that.

do it right or don't do it @ all.

 

[Gmac03]

do it right or don't do it @ all.

Agreed.

Haha.

Gmac

 

[Domino81]

I've heard that as well. Can't seem to find any proof other than, zoom zoom boom. I'd like to know why they throw a rod.

Saw your car yesterday on Taft, sounded good.

I'll have to meet up with you sometime, check it all out.

Gmac

Did you pass me on 81 on Thanksgiving?

 

[Gmac03]

Maybe...there are only two other MS3's around here. Your blue one and a white one.

Gmac

 

[blumpkin69]

The factory setup can handle way more than 350 as long as your power band is upstairs. Peak torque at 4k or higher is recommended . My turbo is way bigger than that and I have no problems with my setup. Also if u have all the supporting mods u will be fine.

 

[blackdragon0731]

I've been told we're factory equipped with forged internals already to support the turbo setup from the start so I'd say go for it but don't expect to be running that turbo as high as it can handle without beefing up the internals first, but I think that's the case with any turbo... we can up the boost on our stocker as is, it's not like everyone runs upgraded turbo's at their highest potential... running the same amount of boost as stock on an upgraded turbo already yields impressive results, why not just keep it safe?

 

[anm6]

Sure run it but like said above if the peak TRQ number is close to 3500-4k you ok, The issue is that the rods in this car SUX and with the 2.3 and small turbos. K04-2871 they spool so fast and make all the TRQ down low where the rod snap.. I have read a lot of guys are going GT30's to so the TRQ is up a bit higher, Saving the rods.. But if you have the $$ just change the rods and the rest is GOOD..

 

[cpolly69]

a good question to ask yourself before upgrading the turbo would be - what kind of shape is my motor in now?
with that in mind - how does it stack up on a compression test? how about a leak down test?
btw this turbo will at best get you a little better then stock hp - it will spool about the same as stock and get you mid 300's on a dynojet or low 300's on a mustang dyno...
these numbers are with the most aggressive tuning

 

[Speedkid]

You should be good with a gt2871r because there is a speed 6 around my way with a gt3071r and he has been running for about 2years with it but he doesn't run it hard alot tho.

 

[essejkcamraw]

2871 will be fine on stock internals, so long as its tuned to hit boost in the higher rpms. there are quite a few 400hp speed3/6's with stock internals running around. it all comes down to tuning, as long as you have a capable and knowledgeable tuner you will be fine. this is where it's key to run a big turbo on these cars... its not the internals of the motor it's how they are tuned stock.

too much torque and boost at such a low rpm will destroy any motor. these k04 turbo's are the problem here, honestly a 3071 is PERFECT for this car. safe for stock internals and good enough to hit the 400's where as the 2871 will be lucky to see 375.

the real answer here is, what are your goals and money situation? is a built motor required? no. is it nice? yes. a properly built motor and you wont have to think about throwing a stock rod through the side of the block again.