hmmmm I dont think it was even 2.75 when Bill measured, a definite restriction IMO
63mm when i measured it from memory = 2.5"
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63mm when i measured it from memory = 2.5"
jamiebennett81
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jamiebennett81
Guest
just been sent a very interesting link in regards to a gt30 setup
scroll down for the dyno plot............
http://www.audi-sport.net/vb/showthread.php?t=64264
scroll down for the dyno plot............
http://www.audi-sport.net/vb/showthread.php?t=64264
jamiebennett81
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Feck, once that thing hits 4250rpm
Bet its a pig to drive though. All or nothing.
jamiebennett81
Guest
Feck, once that thing hits 4250rpm
Bet its a pig to drive though. All or nothing.
thing is though, its lag lag lag, boost, change gear and so on
Useless on UK roads, racecar only that thing. I actually think the smaller a/r GT2860RS may be the perfect turbo for UK roads and tracks, fast spool with a decent hit of power. Chase an Impreza down a twisty country road and the last thing you want is lag and slow spool, top end peak power means very little.
jamiebennett81
Guest
starting to sway towards this setup, very much 50/50 on the gt2860rs or gt2871
this statement puts me off slightly from BDMS though
"The dyno readouts show the awesome difference between the standard road car and a car fitted with a Backdraft Motorsport kit. The power is boosted from 150 / 180 bhp to a breathtaking 325 bhp at 6400 rpm with an increase in torque to 320 ft lb at 5000 rpm. The 0-60 time comes down from just over 7 seconds to under 5 seconds. Power delivery is progressive and predictable so exiting bends is a dream, with acceleration available when you need it. If you share our passion for the highest standards of automotive performance then this is the kit for you. "
In the sense of chasing figures, perhaps not enough for me, but in terms of on the road and plantable power, perhaps it is. In regards to the figures, to change the whole kit again for an extra 40bhp gain and for the expense of at least 3k+ is alot of money.......
very much stuck on what to do here
What puts you off? Who really 'needs' 380-400bhp anyway?I've heard quite a few people say the GT2871R is laggy. Not trying to put you off or sway you at all, just trying to apply some logic and common sense.
jamiebennett81
Guest
just googled the gt2860rs as I was looking for dyno plots and came across this discussion on the vortex forums
I am literally quoting what they have said, this is not my opinion. They are discussing the gt28r, gt28rs and gt2871. This is based on a 225 engine
linky here - http://forums.vwvortex.com/zerothread?id=3080802&postid=36122826
"the 28r is not much bigger than the ko4 in which you already have. So that really isnt much of a choice since there is no reason to spent money on a turbo that my only get you another 10-20whp max.
The 28rs is a better choice iy you want a nice all around turbo that makes GOOD power and has excelent spool. Most see 20 psi within 3500-4000rpm depending on which turbine housing they get. This turbo has been seen to get anywhere from 290whp all the way up to 360whp (both fwd and higher one has water/meth injection).
The 2871r is probably the BEST choice since it will only take a few hundred rpms later to spool than the rs and will make more power per psi than the rs. If you are willing to give up a few hundred rpm's this turbo should stay in boost all the way to 7500 rpms. If you are concerned about rods then if you get the .63/.64 turbine you can just keep the psi lower around 18 or so and if you get the larger turbin .82/.86 you can run more psi since it spools later and has a more gentle torque curve (TORQUE BREAKS RODS NOT HP)."
"But your only two REAL options are a gt28rs and a gt2871r unless you want to spend another $500+ for a hks variant. Plus you can get larger or smaller turbine housings that will change total hp and spool time.
28rs .64 = really fast spool
28rs .86 = 300-400 rpm slower spool but makes more hp and will hold it much longer
2871r .64 = about the same spool as the 28rs .86 but will have more hp but you need to run lower boost 18-20 untill you get stronger rods.
2871r .86 = another 300-400 more in spool but you can hold it till atleast 7500rpms (which you tuner can move your redline to) and will make more power than the .64 and be much safer on your rods. Some are running 22+ psi on this turbo and making 350whp and still have room for more hp."
I think I remember Bill stating the 2871r with the .86 housing is very laggy, and works so much better with the.64 housing for spool etc
I dont know Rob, its just that aspect in the back of my mind, that is it really a much bigger upgrade in terms of figures over yours or my current setup. I know on the road it will be quite a big difference between the gt2x and gt28** variant, still I cant help it though
what housing will you go for on the 28rs, .64 or .86?
I am literally quoting what they have said, this is not my opinion. They are discussing the gt28r, gt28rs and gt2871. This is based on a 225 engine
linky here - http://forums.vwvortex.com/zerothread?id=3080802&postid=36122826
"the 28r is not much bigger than the ko4 in which you already have. So that really isnt much of a choice since there is no reason to spent money on a turbo that my only get you another 10-20whp max.
The 28rs is a better choice iy you want a nice all around turbo that makes GOOD power and has excelent spool. Most see 20 psi within 3500-4000rpm depending on which turbine housing they get. This turbo has been seen to get anywhere from 290whp all the way up to 360whp (both fwd and higher one has water/meth injection).
The 2871r is probably the BEST choice since it will only take a few hundred rpms later to spool than the rs and will make more power per psi than the rs. If you are willing to give up a few hundred rpm's this turbo should stay in boost all the way to 7500 rpms. If you are concerned about rods then if you get the .63/.64 turbine you can just keep the psi lower around 18 or so and if you get the larger turbin .82/.86 you can run more psi since it spools later and has a more gentle torque curve (TORQUE BREAKS RODS NOT HP)."
"But your only two REAL options are a gt28rs and a gt2871r unless you want to spend another $500+ for a hks variant. Plus you can get larger or smaller turbine housings that will change total hp and spool time.
28rs .64 = really fast spool
28rs .86 = 300-400 rpm slower spool but makes more hp and will hold it much longer
2871r .64 = about the same spool as the 28rs .86 but will have more hp but you need to run lower boost 18-20 untill you get stronger rods.
2871r .86 = another 300-400 more in spool but you can hold it till atleast 7500rpms (which you tuner can move your redline to) and will make more power than the .64 and be much safer on your rods. Some are running 22+ psi on this turbo and making 350whp and still have room for more hp."
I think I remember Bill stating the 2871r with the .86 housing is very laggy, and works so much better with the.64 housing for spool etc
What puts you off? Who really 'needs' 380-400bhp anyway?I've heard quite a few people say the GT2871R is laggy. Not trying to put you off or sway you at all, just trying to apply some logic and common sense.
I dont know Rob, its just that aspect in the back of my mind, that is it really a much bigger upgrade in terms of figures over yours or my current setup. I know on the road it will be quite a big difference between the gt2x and gt28** variant, still I cant help it though
what housing will you go for on the 28rs, .64 or .86?
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2871R with .64 is probably a good combo to go for, crank up the boost once rods are in.
Not sure if I'm going any further at all m8, might just leave it as is, haven't even used the hybrid GT2X in anger or know how much power it's kicking out yet!
Not sure if I'm going any further at all m8, might just leave it as is, haven't even used the hybrid GT2X in anger or know how much power it's kicking out yet!
jamiebennett81
Guest
mine has seemed to open up a bit more lately and boost is coming in quite hard and holding power well (perhaps too quick to judge) but I am relatively happy with it, now that I am used to it's spool and how it drives, it holds power all the way to the red line
seems every little bit of work I do to the engine bay....replacing standard pipes with uprated kit etc, the car is working very well right now (touch wood). I will be writing up a full gt2x review at some point over the weekend
My old 2871 was very laggy when compared to my Owens turbo, My turbo starts to pull from 2500What puts you off? Who really 'needs' 380-400bhp anyway?I've heard quite a few people say the GT2871R is laggy. Not trying to put you off or sway you at all, just trying to apply some logic and common sense.
1 bar by 3700 and full on by 4200. The 2871 I had was .86 originally and was stupid laggy, Changed to 64 housing and was much better but lost top end power. My 2860 was much better than 2871 (for me) but both don't compare to my new setup Backdraft
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Im very happy with the 2860rs .64 on my car. It does hold boost all the way to 7k before it slightly drops off. It is silly fast, but i think thats more from the weigh of the car. We run the 2871r .86 on the race car and the boost does come in fairly early, but on a road car that had the same turbo (large port head) the boost was very late.
If i was you jamie then i would opt for the 2871 .64 for more power if you do rods or the 2860 .84 if you want the car to be slightly more usable. This will be more than enough on your car. Just get a diff fitted before you go any further.
When i finally get around to building my engiine then i will either be putting a 2871r .64 or 3071r .64 on instead of the 2860. I just wonder what I will break on the car next.
If i was you jamie then i would opt for the 2871 .64 for more power if you do rods or the 2860 .84 if you want the car to be slightly more usable. This will be more than enough on your car. Just get a diff fitted before you go any further.
When i finally get around to building my engiine then i will either be putting a 2871r .64 or 3071r .64 on instead of the 2860. I just wonder what I will break on the car next.
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