25psi on GT2871R turbo

[aaronamerica]

ok I finally got my car to run good afr's and its running very very strong now...I love the look on muscle car guys face when I pull away from them in a 4 door sedan lol but anyway..... are you guys able to hit 25psi on your gt2871r? for some reason I can only get up to 22-23psi and sometimes it will hit 24psi on a cold night but very rare and thats with the boost controller set at the highest level... I have the greddy profec B spec2 electronic boost controller. I'm assuming thats all the this turbo can put out, is this correct?

[SeanF]

thats not likely the highest it can reach.. im assuming its internally gated... whats the wastegate set at? the spring could likely be holding you back... have you adjusted the actuator?

[mike-2ptzero]

Is this on pump or race gas? Having raced a few 2871r setups I have yet to see any of them hit over 25psi while running thru the gears.

[aaronamerica]

well its on pump gas but right now I'm just trying to get the boost set to hit 25psi for my hi boost setting so I can switch it over for when I run race gas and low boost setting will be18-19psi

[aaronamerica]

thats not likely the highest it can reach.. im assuming its internally gated... whats the wastegate set at? the spring could likely be holding you back... have you adjusted the actuator?

you mean the actuator on the wastegate, can that be adjusted?

[AudiRacerS4]

yes the actuator arm that connects to the wastegate on the outside of the turbo can be adjusted to allow more boost

[aaronamerica]

yes the actuator arm that connects to the wastegate on the outside of the turbo can be adjusted to allow more boost

really!!! I didn't know that, so how do I do this do I losen it or tighten it, I'm trying to just make 25psi consistent on race gas

[oneup]

you might need new actuator that has stiffer spring in it. denpend on what wastegate spring rate you have.

[aaronamerica]

thats not likely the highest it can reach.. im assuming its internally gated... whats the wastegate set at? the spring could likely be holding you back... have you adjusted the actuator?

yes its a internal

[AudiRacerS4]

well you would want to tighten it so the wastegate doesn't not open as early so you can make more boost

[aaronamerica]

well you would want to tighten it so the wastegate doesn't not open as early so you can make more boost

so by doing this will allow for more boost?

[NyteEscape]

try water injection or meth injection. that might help.

[BJC]

Is this on pump or race gas? Having raced a few 2871r setups I have yet to see any of them hit over 25psi while running thru the gears.

Chris Tapp's file on the GTRS runs 25psi.

[BJC]

really!!! I didn't know that, so how do I do this do I losen it or tighten it, I'm trying to just make 25psi consistent on race gas

Better be carefull and not overspin the compressor wheel.

[BranCKY3]

My 2871r has hit 28+ psi a few times, thanks to a kinked hose going to the wastegate.

[Tiluleshpingen]

wow when u hear about you guys hitting 22-psiand up i get scared.. isnt this dangerous?? i have ko3 giac file.. i hardly hit 19 psi.. and i thinks thats dangerous..isnt that right?

[mike-2ptzero]

Chris Tapp's file on the GTRS runs 25psi.

And Greg has ran 30psi when he had his, but on pump gas it is best to stay below 22psi. Running higher boost produces higher IAT's which in turn will cause the ECU to pull more timing which can cause the boost level to drop off. This might be why he still cant hit 25psi even though his boost controller is set for higher boost, the effects of this will be a spike then a drop in boost till it levels off.

[01'A41.8T]

I run 25 all day long, although not with my Greddy. I hated that thing so I took it out. It was almost impossible to get it to push even 24 psi.

[01'A41.8T]

Keep in mind I also have methanol injecton

[aaronamerica]

thats what i was thinking I'm going to swap to my other boost controller and see what happens

[bitterchild]

you could just pull off the actuator boost source and see if it peaks over 25psi. The turbo itself can make that pressure; even the eliminator

[CO AVANT]

Be thankful you can even get anywhere near 25psi. I run a GTRS at 5000ft in elevation, and it absolutely kills this thing with combating the thin air. The GTRS won't push any more than 23psi up here, and that's with my AVC-R EBC set at almost 100% duty. I don't run any more than 22psi since it's already overworking this turbo up here. I really want something that boosts to 30psi, maybe a 3071R...

[94jedi]

Be thankful you can even get anywhere near 25psi. I run a GTRS at 5000ft in elevation, and it absolutely kills this thing with combating the thin air. The GTRS won't push any more than 23psi up here, and that's with my AVC-R EBC set at almost 100% duty. I don't run any more than 22psi since it's already overworking this turbo up here. I really want something that boosts to 30psi, maybe a 3071R...

^ is your motor built to handle 30psi from a Gt30?

[EuroA4]

Is 25psi out of the efficiency range of the 2871R?

[1 ate T]

Is 25psi out of the efficiency range of the 2871R?

no...

[CO AVANT]

^ is your motor built to handle 30psi from a Gt30?

82mm 9:0:1 forged JE pistons
2.0 forged crank
eurospec forged connecting rods (yeah, I know...)

Cat 3651 cams
ferrea exhaust valves w/ valve job
Cat springs
OE retainers
New Hydro lifters
Ported and polished ports into the valves (exhaust & intake)

[jrodmk2]

^^^^nice response

[94jedi]

^^^^nice response

yep, lol I saw his thread in the b6 forum.

[CO AVANT]

How much psi can you push with that T3/T4 of yours? ^^^^^

[94jedi]

How much psi can you push with that T3/T4 of yours? ^^^^^

efficiently? maybe 27psi. I run 20 daily and my race gas file calls for 25. Anymore than that and I'm probably not able to cool the charge w/ my ebay FMIC. not to mention that 30psi is probably out of the eff. range. I'm not sure though, since I've never seen a compressor map for my turbo.

[CO AVANT]

Is the .48a/r small for that turbo or is that what all T3/T4's come with? Should have some good spool up time I would believe huh?

[94jedi]

Is the .48a/r small for that turbo or is that what all T3/T4's come with? Should have some good spool up time I would believe huh?

yea, the .48 is the smaller a/r. t3/t4's come with all different combo's supporting from 300 - 600 hp. when I discussed my needs/wants/budget with bitterchild (helped me put together my BT setup) he thought the combo of the small a/r and 50 trim comp would be perfect. it's very torquey and pulls hard in the midrange. It spools quick for a jb turbo. full boost (20psi) by 3700 if I recall. I basically wanted a nice street light turbo. something that I could launch hard and surprise people with. for that it's been perfect but of course now I want more power and I'm willing to sacrifice some spool time/bottom end power. I've been thinking of going w/ a gt30 of some kind but I've also thought of just going w/ a 57 trim .63 a/r t3t4 which is the more common t3t4. the major limiting factor for me is #1 - $$$$ and #2 my internal wgate. Since my mani doesn't have provisions for an ext gate...I'm a bit limited in what I can do. And I don't want to spend more $$$ than I have to. I'd love to do a t3 flanged 3071 w/ int wg or maybe even a 3076 but from what I've been reading, people don't recomend going int. wg on those turbos.

[CO AVANT]

Yeah I totally forgot about that. Pretty sure my ATP mani will get in the way of an external wastegate. A tubular mani would be nice, but I havent seen one yet for AWD that has not had problems of some kind. Reading on Vwvortex, guys are saying they can get a 3071R with a 56 trim to spool to 20psi by 4000rpms or less. Somehow I find this hard to believe, espeically on revo BT software. Do you mind me asking how much Chris Tapp charged you for a custom tune? Where is he located?

[94jedi]

Yeah I totally forgot about that. Pretty sure my ATP mani will get in the way of an external wastegate. A tubular mani would be nice, but I havent seen one yet for AWD that has not had problems of some kind. Reading on Vwvortex, guys are saying they can get a 3071R with a 56 trim to spool to 20psi by 4000rpms or less. Somehow I find this hard to believe, espeically on revo BT software. Do you mind me asking how much Chris Tapp charged you for a custom tune? Where is he located?

CTapp is very competitively priced. I paid $800 for a 2 file ecu(pump/race) w/ a flip switch. of course, I still had to buy the requisite injectors, maf,maf harness and adj fpr (or static 3bar). I also had to buy some part to fabricate my own TIP but that's more because of the odd turbo I'm using than anything else.

CTapp is in Canada. Ottowa I think. Check his website tappauto.com