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mik5082

help with compressor maps for the Gen II Gtx2860r & Gtx2867r

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1636_001.pdf

 

Hi Garrett has released the GEN II range and these are the new maps for the gen 2 range I am still trying to get my head around these compressor maps can some one plot them out or explain them

 

how much horsepower will they support?

how well will the turbo spool? at 3000rpm & 3500rpm at 20psi

actual potential on the motor?

 

i have been using these sites

 

http://hondaswap.com...dummies.129194/

 

http://lovehorsepowe...stuff&Itemid=49

 

Thanks Mik

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I have a GTX2860R im waiting to put on, couldnt find anyone running one on a SR20. Kinda annoyed they already did an update on them, must have got one of the last first gen ones

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though not knowing how to really read compressor maps, im this gave me some confidence as I loved discos for street turbos. Hoping to have similar respose but a bit more up top haha

 

GTX2860R-vs-GT2860RS.JPG

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Locky please post up results when you get the turbo fitted and tuned (will you be running e85). I was in the same dilemma before i bought and fitted a vn14 turbo, but it turned out to be a good choice on e85.

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You've got to be kidding me. Gen 2 makes 20% more power? what the hell, so soon after I get my gen 1 set up lol. There's gotta be a catch, right? More power but less responsive compared to gen 1 of the GTX series?

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Agreed i was all sorted in getting a gtx2863 and now im back to square one again :(

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Agreed i was all sorted in getting a gtx2863 and now im back to square one again sad.png

 

i have a GTX2863 and i am definitely not feeling disappointed with it.

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What I noticed is that v2 looks to have worse efficiency overall, and especially at higher boost levels - 2.5 pressure ratio and above, which is >20psi give or take. The new maps also show a smidge of extra flow at the very far edges of the map, but it's unclear if that will translate into real life or if it just looks good.

 

Therefore I'm sort of skeptical they'll make any extra power, if anything I'm worried they'll be worse than v1, in particular for 2L turbo engines on E85 and high boost. Suspect they're aimed at turbo-converted V8s on lower boost - mind that Garrett is also releasing reverse rotation variants for symmetrical twin turbo setups.

Edited by Skepticism

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Holy shit they're a rip off. 2.8k from GCG for a gtx2 3076. That's external gate so you also need to buy a gate. A twin scroll EFR 7163 with an internal gate is 3.2k and you don't need to buy a gate. its going to be more responsive and have a better powerband for the same power output. I don't get what garret have done... Moved their turbos closer in price to EFRs but failed to actually close the performance gap?

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EFR still have issues that there smallest turbo is still huge and pretty much cant be mounted in a stock position without a whole lot of fucking around/expense on top of the turbo being expensive. Unfortunately there isnt thaaaat many option if you want responsive 230-250kw in the newer tech turbos compared to the 280-350kw range. A lot you are looking at is 10-15 year old deisgns. Im no means a massive garret fan as gone through a few 2nd hand garrets and HKS turbos. But for 1300 for a super core, plus 50-100 to get a blown disco/2817 for a .64 housing, Its still a realitivly cheap bolt on solution for a modern smaller turbo

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Yeah, obviously you can't beat a bolt on 2871r for value but we're talking about new fancy gen2 stuff. Having to buy a new manifold is obviously a killer. Although, I was under the impression someone got a efr 6258 or 6758 on a stock manifold with slight mod to the engine mount. If someone had the choice between a gen2 gtx3076 and a efr 7163 for example and are planning to buy a new manifold, there isn't a logical reason to get the GTX. I just can't see it

 

As for the sizing, the 6258 is plenty small and is pretty much best placed around 250kw. It's good for 270kw on e85 but is going to respond like a much smaller turbo. The thing about them is because the response is so good, you don't have to run a smaller turbo to keep low down.

Edited by nicknack

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EFR still have issues that there smallest turbo is still huge and pretty much cant be mounted in a stock position without a whole lot of fucking around/expense on top of the turbo being expensive. Unfortunately there isnt thaaaat many option if you want responsive 230-250kw in the newer tech turbos compared to the 280-350kw range. A lot you are looking at is 10-15 year old deisgns. Im no means a massive garret fan as gone through a few 2nd hand garrets and HKS turbos. But for 1300 for a super core, plus 50-100 to get a blown disco/2817 for a .64 housing, Its still a realitivly cheap bolt on solution for a modern smaller turbo

 

There are plenty of options out there if you look around at better prices with real world motor sport testing data to back up the claims, plus pricing on the Garrett Gen 2 and EFR are cheaper if you know where to look rather than at internet pricing from main stream retailers

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What prices can you get efr6758 and 7163 delivered for? Im contemplating whether to upgrade.

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