Help, Full cosworth build, turbo selection? GT2871r?
#1
Registered User
Thread Starter
Join Date: Oct 2009
Location: Christchurch, New Zealand
Posts: 39
Likes: 0
Received 0 Likes
on
0 Posts
Help, Full cosworth build, turbo selection? GT2871r?
I'm currently building an engine to replace my stock internal twin turbo. This engine is to be used in a single seater off road race car. The racing style is very much based on stabbing the throttle and short, point to point, squirts. As such broad spread of torque and quick throttle response are essential. The GT2560r's I currently have are an incredible turbo, meet my every need on the stock internal engine. However with the new engine I'm attempting push the boundaries a little. With a lower cr, stronger rods and pistons I'm hoping to run around the 700hp mark. Using the squirrel performance site the GT2871r 48 trim looks to be close on perfect. However it'll mean changing my compressor housing plumbing to suit. I wondered if anyone had experience with any of the GT2871r's and where in the RPM range they made power. Or even if someone else had good experiences with another turbo that they think would be suitable.
#3
Registered User
Thread Starter
Join Date: Oct 2009
Location: Christchurch, New Zealand
Posts: 39
Likes: 0
Received 0 Likes
on
0 Posts
Garrett rate them at 330 per turbo. Thats max flow potential. I think I'd be lucky to pull 620 flywheel hp with them (I'm probably 40hp shy of that now). They also drop off dramatically at the upper RPM end of the boost map, limiting my max rpm range.
I'm actually thinking of biting the bullet and going the GT2871R - 472560 - 15. Which will force me to use more RPM. With the Cosworth heads and high duration zk2 cams it should work... theoretically.
Then there is also the HKS GTRS...
I'm actually thinking of biting the bullet and going the GT2871R - 472560 - 15. Which will force me to use more RPM. With the Cosworth heads and high duration zk2 cams it should work... theoretically.
Then there is also the HKS GTRS...
Last edited by redmist; 02-19-2010 at 08:57 PM.
#4
Registered User
iTrader: (4)
Join Date: Apr 2009
Location: Puerto Rico
Posts: 769
Likes: 0
Received 0 Likes
on
0 Posts
Getting 700whp out of the GT2560's would be greatly pushing them. The GT2871R's .63 a/r are a much better bet and lag increase would be little. GT2871R's can be pushed to about 750whp so you'll still be pushing them but at least they would spool quick.
BTW- maybe this will help make it bolt on: http://www.atpturbo.com/mm5/merchant...egory_Code=GRT
BTW- maybe this will help make it bolt on: http://www.atpturbo.com/mm5/merchant...egory_Code=GRT
Last edited by GT-ER; 02-20-2010 at 02:59 AM.
Thread
Thread Starter
Forum
Replies
Last Post