Question about the Garrett GT2871R
12-16-2004, 08:45 AM
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Question about the Garrett GT2871R
Atpturbo offers the GT2871R with a T3 turbine housing (which I'm going to need ) & TO4E compressor housing.
http://www.atpturbo.com/Mercha...e=GRT
My question...
Would I benifit from buying the turbo with the larger compressor housing?
What are the downfalls from doing this, if any?
I don't plan on running more than 11psi, since I'd have to change the stock MAP sensor. Which is something I don't want to do. I'd like to make 300whp (dynojet) with only 11lbs. That's why I'm concerned, going with a smaller turbo.
My setup...
Stock b18c5
Hondata w/RC750cc injectors
2.5" downpipe, 2.5" Cat-back Exhaust, and 2.5" test pipe.
Sorry for all the n00b questions, but I want to get everything right this time around. No more big huge turbos on small motors when my goals are so low.
Example... my old setup: stock b16, SC34 turbo and a goal of 300whp. There was no reason to use that turbo.
http://www.atpturbo.com/Mercha...e=GRT
My question...
Would I benifit from buying the turbo with the larger compressor housing?
What are the downfalls from doing this, if any?
I don't plan on running more than 11psi, since I'd have to change the stock MAP sensor. Which is something I don't want to do. I'd like to make 300whp (dynojet) with only 11lbs. That's why I'm concerned, going with a smaller turbo.
My setup...
Stock b18c5
Hondata w/RC750cc injectors
2.5" downpipe, 2.5" Cat-back Exhaust, and 2.5" test pipe.
Sorry for all the n00b questions, but I want to get everything right this time around. No more big huge turbos on small motors when my goals are so low.
Example... my old setup: stock b16, SC34 turbo and a goal of 300whp. There was no reason to use that turbo.
12-16-2004, 09:44 AM
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Re: Question about the Garrett GT2871R (Mpir3)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mpir3 »</TD></TR><TR><TD CLASS="quote">go gt28rs, its alot more impressive than the 28/71 IMO and it wil easily make over 300whp @ 11psi</TD></TR></TABLE>
Boosted Hybrid made 325whp @ 12psi on the dynopak (~295dynojet) with a FR manifold, AIR Manifold, ported head, etc. Plus the turbo started to loose it's fury after 7,300rpm.
Modified by NickQ at 11:47 AM 12/16/2004
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12-16-2004, 09:58 AM
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Re: Question about the Garrett GT2871R (Full-Race Geoff)
Agree with Geoff
I've dynotuned cars that picked up 60whp at the same boost level by switching from GT28RS to GT2871R. the compressor on the GT28RS is a joke and will LIMIT you to 300 whp on a good day.
Boosted Hybrid will tell you otherwise (325 hp)...but his dyno chars are estimated Flywheel HP...not wheel HP.
Modified by Enthalpy at 2:33 PM 12/16/2004
I've dynotuned cars that picked up 60whp at the same boost level by switching from GT28RS to GT2871R. the compressor on the GT28RS is a joke and will LIMIT you to 300 whp on a good day.
Boosted Hybrid will tell you otherwise (325 hp)...but his dyno chars are estimated Flywheel HP...not wheel HP.
Modified by Enthalpy at 2:33 PM 12/16/2004
12-16-2004, 10:19 AM
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Re: Question about the Garrett GT2871R (Enthalpy)
I agree !!
The GT2871 definitely is better than the normal GT28RS. For the price that is lower than the GT28RS, a lot of customer chose the 2871 over the GT28RS lately !
stan
The GT2871 definitely is better than the normal GT28RS. For the price that is lower than the GT28RS, a lot of customer chose the 2871 over the GT28RS lately !
stan
12-16-2004, 10:53 AM
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Re: Question about the Garrett GT2871R (Enthalpy)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Enthalpy »</TD></TR><TR><TD CLASS="quote">Agree with Geoff
I've dynotuned cars that picked up 60whp at the same boost level by switching from GT28RS to GT2871R. the compressor on the GT28RS is a joke and will LIMIT you to 300 whp on a good day.
Boosted Hybrid will tell you otherwise (325 hp)...but his dyno chars are estimated Flywheel HP...not wheel HP.
Modified by Enthalpy at 2:33 PM 12/16/2004</TD></TR></TABLE>I dont' have any experience wtih gt28rs on a honda but i know a few vw's pushing over 350whp with one. one of them switched to a 2871 and while it did make more power (about 30whp @ 26psi) the throttle response and lag really suffered. the 2871 car felt like any other ordinary t3/t04e 50 trim in terms of spool, etc.
Last i checked Jeff's dyno's are far from esitmated flywheel HP, In fact a few cars i know that dyno'ed there read slightly higher on dynojets
Everyone just ASSumes that a dynapack reads 15% higher
I've dynotuned cars that picked up 60whp at the same boost level by switching from GT28RS to GT2871R. the compressor on the GT28RS is a joke and will LIMIT you to 300 whp on a good day.
Boosted Hybrid will tell you otherwise (325 hp)...but his dyno chars are estimated Flywheel HP...not wheel HP.
Modified by Enthalpy at 2:33 PM 12/16/2004</TD></TR></TABLE>I dont' have any experience wtih gt28rs on a honda but i know a few vw's pushing over 350whp with one. one of them switched to a 2871 and while it did make more power (about 30whp @ 26psi) the throttle response and lag really suffered. the 2871 car felt like any other ordinary t3/t04e 50 trim in terms of spool, etc.
Last i checked Jeff's dyno's are far from esitmated flywheel HP, In fact a few cars i know that dyno'ed there read slightly higher on dynojets
Everyone just ASSumes that a dynapack reads 15% higher
12-16-2004, 11:04 AM
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Re: Question about the Garrett GT2871R (Mpir3)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mpir3 »</TD></TR><TR><TD CLASS="quote">
Everyone just ASSumes that a dynapack reads 15% higher
</TD></TR></TABLE>
The norm is in fact, 7-10% higher reading on the dynapaks.
Everyone just ASSumes that a dynapack reads 15% higher
</TD></TR></TABLE>
The norm is in fact, 7-10% higher reading on the dynapaks.
12-16-2004, 11:10 AM
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Re: Question about the Garrett GT2871R (Mpir3)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mpir3 »</TD></TR><TR><TD CLASS="quote">Last i checked Jeff's dyno's are far from esitmated flywheel HP, In fact a few cars i know that dyno'ed there read slightly higher on dynojets
Everyone just ASSumes that a dynapack reads 15% higher </TD></TR></TABLE>
man...i knew somone would catch that
heres the deal. if you look at his dyno chart from that comparison it says right on the chart. "Flywheel TQ" and if HP and TQ still cross at 5252 then one can only assume that it is "Flywheel HP" shown as well. unless it's just some issue with the terminology they use... I which case i'm the *** in ASSume.... HAHAHAHA
i'll bow down to whoever can show me 350whp out of a GT28RS on a dynojet!! post a dyno chart on dynojet and i'll buy you beer or something.
Also maybe it's those 5 bolt housings you guys use. us SR guys are getting HUGE gains out of the 2871 over the 28RS. with almost no spool changes when both turbos are running the .64 A/R T2 housing.
Everyone just ASSumes that a dynapack reads 15% higher
</TD></TR></TABLE>man...i knew somone would catch that
heres the deal. if you look at his dyno chart from that comparison it says right on the chart. "Flywheel TQ" and if HP and TQ still cross at 5252 then one can only assume that it is "Flywheel HP" shown as well. unless it's just some issue with the terminology they use... I which case i'm the *** in ASSume.... HAHAHAHA
i'll bow down to whoever can show me 350whp out of a GT28RS on a dynojet!! post a dyno chart on dynojet and i'll buy you beer or something.
Also maybe it's those 5 bolt housings you guys use. us SR guys are getting HUGE gains out of the 2871 over the 28RS. with almost no spool changes when both turbos are running the .64 A/R T2 housing.
12-16-2004, 11:27 AM
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Granted I own a car with a completely different setup, running a different RPM range with different boost levels, but I have a GT2871R on my own car.
I have dyno'd 320WHP on 91 octane. In a 2500 pound car, that should be good for a pretty quick little car.
As far as response, it hits hard and fast with almost no lag. I can have 12 PSI by 2800 RPMs on a 2.0L.
For all out power, it managed to pull a 3000 pound car with a crappy motor to a 12.0 @ 116mph.
I have dyno'd 320WHP on 91 octane. In a 2500 pound car, that should be good for a pretty quick little car.
As far as response, it hits hard and fast with almost no lag. I can have 12 PSI by 2800 RPMs on a 2.0L.
For all out power, it managed to pull a 3000 pound car with a crappy motor to a 12.0 @ 116mph.
12-16-2004, 11:33 AM
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Re: Question about the Garrett GT2871R (Enthalpy)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Enthalpy »</TD></TR><TR><TD CLASS="quote">
man...i knew somone would catch that
heres the deal. if you look at his dyno chart from that comparison it says right on the chart. "Flywheel TQ" and if HP and TQ still cross at 5252 then one can only assume that it is "Flywheel HP" shown as well. unless it's just some issue with the terminology they use... I which case i'm the *** in ASSume.... HAHAHAHA
i'll bow down to whoever can show me 350whp out of a GT28RS on a dynojet!! post a dyno chart on dynojet and i'll buy you beer or something.
Also maybe it's those 5 bolt housings you guys use. us SR guys are getting HUGE gains out of the 2871 over the 28RS. with almost no spool changes when both turbos are running the .64 A/R T2 housing. </TD></TR></TABLE>
Jeff has explained his dyno quite a few times on here and even has dyno'ed cars on his dyno then a local dynojet to compare numbers. Ive had a quite a few friends dyno on his dyno and then again on a dynojet. His dyno reads slightly lower, it has been proved.
Do a search on vwvortex for gt28rs, you'll find handfulls of 1.8t's making over 350whp on a dynojet. hell even apr's 28rs kit is pulling 340ish on race gas and it is very conservative. They are still running the t25 based turbo too...If i wasn't @ work and had the time to search for a dyno i'd take you up on that beer, Im in tampa quite often
EDIT: I believe JDOGG made 371?? on his dyno on a b16?? not sure what type of dyno though..
Modified by Mpir3 at 8:47 PM 12/16/2004
Modified by Mpir3 at 8:49 PM 12/16/2004
man...i knew somone would catch that
heres the deal. if you look at his dyno chart from that comparison it says right on the chart. "Flywheel TQ" and if HP and TQ still cross at 5252 then one can only assume that it is "Flywheel HP" shown as well. unless it's just some issue with the terminology they use... I which case i'm the *** in ASSume.... HAHAHAHA
i'll bow down to whoever can show me 350whp out of a GT28RS on a dynojet!! post a dyno chart on dynojet and i'll buy you beer or something.
Also maybe it's those 5 bolt housings you guys use. us SR guys are getting HUGE gains out of the 2871 over the 28RS. with almost no spool changes when both turbos are running the .64 A/R T2 housing. </TD></TR></TABLE>
Jeff has explained his dyno quite a few times on here and even has dyno'ed cars on his dyno then a local dynojet to compare numbers. Ive had a quite a few friends dyno on his dyno and then again on a dynojet. His dyno reads slightly lower, it has been proved.
Do a search on vwvortex for gt28rs, you'll find handfulls of 1.8t's making over 350whp on a dynojet. hell even apr's 28rs kit is pulling 340ish on race gas and it is very conservative. They are still running the t25 based turbo too...If i wasn't @ work and had the time to search for a dyno i'd take you up on that beer, Im in tampa quite often
EDIT: I believe JDOGG made 371?? on his dyno on a b16?? not sure what type of dyno though..
Modified by Mpir3 at 8:47 PM 12/16/2004
Modified by Mpir3 at 8:49 PM 12/16/2004
12-16-2004, 01:19 PM
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Re: Question about the Garrett GT2871R (NickQ)
Ok, IF I go with theGT2871R......
Atpturbo offers the GT2871R with a T3 turbine housing (which I'm going to need ) & TO4E compressor housing.
My question...
Would I benifit from buying the turbo with the larger compressor housing?
What are the downfalls from doing this, if any?
Atpturbo offers the GT2871R with a T3 turbine housing (which I'm going to need ) & TO4E compressor housing.
My question...
Would I benifit from buying the turbo with the larger compressor housing?
What are the downfalls from doing this, if any?
12-16-2004, 02:52 PM
#17
Re: Question about the Garrett GT2871R (NickQ)
The reading on the dynapack says flywheel, but its at the axle/wheel. Its not flywheel horsepower, its wheel.
My dynapack reads about on par with the dynojets in the area. I have proven this with three seperate cars including my own. Its the way i configure my auto plot ramp times, and leaving SAE correction factor enabled and not messing with the tcf (which would give you flywheel rating if you entered a correction factor for drivetrain loss which i leave at 1.00).
I made 325whp @11psi with the gt28rs. I will easily make over 400whp around 20-22psi with it on race gas with no issues.
Once again, here is my car on a dynojet:
Same day, no tuning changes:
Looks pretty similar to me...
My dynapack reads about on par with the dynojets in the area. I have proven this with three seperate cars including my own. Its the way i configure my auto plot ramp times, and leaving SAE correction factor enabled and not messing with the tcf (which would give you flywheel rating if you entered a correction factor for drivetrain loss which i leave at 1.00).
I made 325whp @11psi with the gt28rs. I will easily make over 400whp around 20-22psi with it on race gas with no issues.
Once again, here is my car on a dynojet:
Same day, no tuning changes:
Looks pretty similar to me...
12-16-2004, 07:19 PM
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Re: Question about the Garrett GT2871R (boosted hybrid)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boosted hybrid »</TD></TR><TR><TD CLASS="quote">The reading on the dynapack says flywheel, but its at the axle/wheel. Its not flywheel horsepower, its wheel. </TD></TR></TABLE>
assume makes an *** out of ME...HAHAHAH
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boosted hybrid »</TD></TR><TR><TD CLASS="quote">I made 325whp @11psi with the gt28rs. I will easily make over 400whp around 20-22psi with it on race gas with no issues. </TD></TR></TABLE>
I would love to see it....but the compressor will be out of gas. hell i have other people on another board tellign me the 71mm 56 trim compressor doesnt have enough to get 400 LOL....they are getting schooled right now though.
either way...i would love to see you prove me wrong!!
assume makes an *** out of ME...HAHAHAH
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boosted hybrid »</TD></TR><TR><TD CLASS="quote">I made 325whp @11psi with the gt28rs. I will easily make over 400whp around 20-22psi with it on race gas with no issues. </TD></TR></TABLE>
I would love to see it....but the compressor will be out of gas. hell i have other people on another board tellign me the 71mm 56 trim compressor doesnt have enough to get 400 LOL....they are getting schooled right now though.
either way...i would love to see you prove me wrong!!
12-16-2004, 07:40 PM
#19
Re: Question about the Garrett GT2871R (Enthalpy)
Probably towards febuary when i get the built block in the car finally I'll turn it up on race gas and see what it makes. JDogg was making 375whp with the gt28rs with the t3 drop in housing at 18-20psi on a 84mm b16a engine awhile back. Its possible, but its going to just break 400whp level. One thing to consider is that i am not using the t25 housing on it, and its not internally gated. I am using the atpturbo t3 .82 a/r drop in housing.
12-19-2004, 10:05 AM
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Re: Question about the Garrett GT2871R (boosted hybrid)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boosted hybrid »</TD></TR><TR><TD CLASS="quote">Probably towards febuary when i get the built block in the car finally I'll turn it up on race gas and see what it makes. JDogg was making 375whp with the gt28rs with the t3 drop in housing at 18-20psi on a 84mm b16a engine awhile back. Its possible, but its going to just break 400whp level. One thing to consider is that i am not using the t25 housing on it, and its not internally gated. I am using the atpturbo t3 .82 a/r drop in housing.</TD></TR></TABLE>
So, will the gt28rs make 300whp on a "stock" b18c5 w/2.5" Exhaust @ 11psi? Without loosing it's breath to 8400rpm?
or
Go with the GT2871R?
So, will the gt28rs make 300whp on a "stock" b18c5 w/2.5" Exhaust @ 11psi? Without loosing it's breath to 8400rpm?
or
Go with the GT2871R?
12-19-2004, 09:16 PM
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Re: Question about the Garrett GT2871R (project dc2)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by project dc2 »</TD></TR><TR><TD CLASS="quote">we shall see how my car does with a 2871R i got a .63 A/R ATP t3t4 drop in housing though.</TD></TR></TABLE>
When do you plan on dyno'ing?
When do you plan on dyno'ing?
12-19-2004, 11:05 PM
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Re: Question about the Garrett GT2871R (RyanAutry)
well realitically i just plan on street tuning and prob gettin in on a dynoday in the future to see some numbers.
12-20-2004, 05:51 AM
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Re: Question about the Garrett GT2871R (project dc2)
we have a civic at the shop that just got a thick head gasket and is getting a 2871R with a .82a/r t3 drop in housing. 100% stock gsr with a skunk2 intake mani. Ill get some dyno #s at the end of the week
