Hi ppl

Your help would be appreciated, Im gonna be boosting my ITR soon and im looking for between 350 and 400hp and hoping to run early 12s late 11s.

Im stuck between which turbo to go for should it be the gt30r or the t3/t4e 50 trim. The obvious difference is the cost between the two and i could use that for the tuning. Im intending on running 9.1 comp on a 81mm b18c5.

Whats the difference in spool times between these two turbos and the peak power, which woould you recommend even if it is a turbo i havnt mmentioned.

Thanks

 

A member of the GT30 family should work well but it will come at a price as you know.

 

Either 30R (71mm or 76mm) will get you there, power-wise-speaking.

All three are excellent turbos with the BB units having the advantage of faster boost onset and response times and the 50 trim having an advantage in price.

There are too many variables involved to give a patent answer on the difference in spool times. Roughly speaking I would imagine the GT3071R would spool 5-800RPM quicker than the 50 trim and the GT3076R to be about the same but having a distinct advantage in responsiveness, meaning quicker to rebuild boost between gear changes.

With all that said the 50 trim is a great turbo. If money were NOT an issue I would go with a GT turbo, and for your power level the smaller 30R. If money were an issue I would go with the 50 trim and not feel bad about it at all.

Peace and good luck with your project.

 

how are you comparing a 50 trim to a 30r, if anything the 57 trim would be closer in size

with that said for your power goals the gt2871 would work just fine and have better response/spool time then any of the turbos listed

 

Depends on your budget. 57 trim is what I would pick over a 50 trim.

I have the 3076r and If money isnt a issue, then deff pick the 3076R!

 

Thanks, nice reply mate. Ive spent quite a bit already, so i really wanna keep the price of the turbo down. Ive previously owned a t3/t67, why im trying to keep the lag down :-) . Id rather not go with a GT30r unless the benefits massively outweigh the 50 trim. I could spenf that money on tuning and other bits that need doing.

i wonder what would be the difference in spool time between a 50 trim and a 57 trim t3/t4e in that case. Or shall i stick with the 50?

 

Funny that the compressor map for the 50 trim always looks better to me (more surge resistance and more efficiency in relavant areas) than the map for the 57 trim, but people on here don't give the 50 trim any love. Makes me wonder if the maps aren't accurate, or if people just don't try them all that often because the 57 trims are all over the place and the 50 trims have to be assembled by one of the turbo vendors. One of the mysteries of my life! LOL. . .

 

You are comparing apples to oranges here really. For that power go with the 57trim as the 50trim will be running out of breath. I had a 60trim before which is pretty much the same as the 57trim and it was perfect for the street.

 

I know there are many different factors such as displacement etc that can effect the spool times. But on an engine with all factors kept the same what would be the spool difference and full boost on these Turbos and efficeincy ranges. I dont mind going big but as i said earlier on the last project i got carried away from a t3 i ended up with a t3/t67 and lag.

 

I hear you on the map comparo... The DSM and Nissan folk love the 50 trim and the Honda folk love the 57 trim. I always attributed it to the higher flowing heads on the Hondas allowed the 57 trim to provide more TE than the 50 which may be better suited to the torque producing and less rev-happy 4G63's.

Re: the GT2871R... which version are you referring to? Some share the 56 trim 71mm compressor of the GT3071R and some have a smaller 52 trim 71 mm wheel. Either way they are matched with the smaller T2 housing which would be far too restricitive for a head that flows as well as a Honda.

If your reply is you can get the 2871 with a T3 turbine than I would say go all they way and get the proper GT housing with the conical discharge (as opposed to someone just machining a T3 to fit) and the Garrett designed 84 trim 60 mm turbine wheel as used on the 71 and 76 mm 30R's.

IMO, the choice is between the 30R or the GT2860RS if you want to go smaller foot print/fewer HP's.

 

You've been pm'd. I've developed an alternative to better fit the GT30R crowd. We've called it the GT3000 Predator. Less than a GT30R with the same characteristics.

 

T3/T4e 50 trim .63 AR is a great pump gas turbo that is WAY cheaper to buy then a GT30 as well as being WAY cheaper to rebuild if needed.

 

Mac, does that turbo look like THIS?



I'll be contacting you shortly on this particular unit, bro.

 

An example of it used on a Subaru STI. The Dyno is a "heartbreaker" so add 12% for SAE correction. Even the GT30R rotated had to work to get similar performance.

http://www.youtube.com/watch?v=CWRXFrxsges

The advantage is GT3076R characteristic performance, rebuildable, no need for water lines, and less cost.

 

That is interesting!

 

so whats the difference between this one and the silver surfer seem real close

 

Whats your budget like? The 57 trim and 30R are very good choices, but if you have the money, the new Precision billet stuff is awesome.

 

Silver surfer has a bit more top end power than the GT3000. Maximum pressure reached on the GT3000 is about 3500-3700rpms as opposed to about 4200rpms with the surfer. I'm not sure how high the GT3000 will be on pump gas w/ a honda, but about the 460whp mark or so, while the Surfer can easily do over 400 on pump gas. The GT3000 uses a 53lbs/min compressor wheel, while the surfer is 61lbs/min

 

That is an option, as I'm a precision dealer, the billet sizes start at 58mm. They also take a bit of time to make. Longer than even me.

 

With all due respect... how does a car on a dyno sans results demonstrate anything?

 

Go into the Youtube URL itself and you'll see the results and what was actually done to the car. You'll see the specifcations in the right hand corner. Again, add 12% for SAE correction from what was posted on Youtube.

This was to also show that the Predator has already been tested on a vehicle.

 

Are you able to throw out some specs for a 58mm version? Sounds like it might be a bit more responsive than my SC61, and maybe make similar power? Or no?

 

Just get a t3/t04e 50 trim. It is a fine turbo. It won't run out of steam for 400hp. The turbo flows 50lb/min. A B18c5 only needs about 35 lb/min to make 400whp.

 

And to make 400whp, you'll need MUCH more than a 35lbs/min wheel, that's for sure.

 

Havent you seen the billet 55mm? Ive used a couple of the small billet stuff so far, only took about a week to get for journal bearing.

Very similar to a 3076 in size, both turbine and compressor. It will make power almost like a 35R but spool like a 30R.