Gtx2860 gen2-- 373whp/351tq-- 22psi
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https://cimg3.ibsrv.net/gimg/www.mia...61755c3500.jpg Sorry for the potato pic but it's legible https://cimg0.ibsrv.net/gimg/www.mia...f9ae86f72.jpeg Virtual dyno is pretty damn good. I just decided yesterday to go dyno my car for the heck of it. Not bad result. I wanted 400whp but my mbc drops boost to redline I need a ebc. Motor is a built bp with a 84.5 bore, stock 4w head, FM manifold and downpipe, gtx 2860 .64 a/r. Running my own little mix of 93 and vp octanium. I was gonna go for more but when I built the motor 2+ years ago I didn't surface the head. I used a cometic hg and it's been fine but yesterday it was pushing coolant, not horribly bad but I know it needs a resurface and a OEM hg this time around. Let that be a lesson to anyone who thinks they can get away without a head resurface even though they know better. Lol my mistake. However I'm gonna build a head now so it's not really a loss lol. Cat still runs fine at 20psi just didn't like higher boost, but it will.....it..... Will. Also for all those people who love early tq you should love my car. It makes tq super early. This turbo is almost instant spool. |
Wow, damn good numbers, I'm jealous. Congrats!
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Yeah those numbers look pretty damn good,
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Thanks boys I appreciate it. I love this turbo on a BP it's just perfectly sized for the motor
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...yup i know what I'm upgrading to when my 2560 gets boring
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Originally Posted by WigglingWaffles
(Post 1581698)
...yup i know what I'm upgrading to when my 2560 gets boring
https://cimg8.ibsrv.net/gimg/www.mia...d45aa5814.jpeg GT2560R @18psi vs GTX2860R Gen2 @22psi Spool as you can see is identical and that just shows you how much better the GTX stuff really is. |
Very nice looking plot, congrats. You can likely lean it out some, high 10's is pretty fat
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Originally Posted by 18psi
(Post 1581701)
Very nice looking plot, congrats. You can likely lean it out some, high 10's is pretty fat
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Congratz,
Regarding the boost up top, I tried several wastegates ( from 10 psi until 18psi spring twin port) and using boost @ 100% and couldn’t pass 21psi up top too. I guess the turbo just can’t flow anymore. |
Originally Posted by kamel6k
(Post 1581707)
Congratz,
Regarding the boost up top, I tried several wastegates ( from 10 psi until 18psi spring twin port) and using boost @ 100% and couldn’t pass 21psi up top too. I guess the turbo just can’t flow anymore. Thanks for the post. |
I need one of these GTX's.
Andy, when your engine is up and running again, can you please update your 60-125 time in the other thread? :) |
Originally Posted by andyfloyd
(Post 1581708)
Hmm, so you are using a ebc and even with 100 wg duty it still won't go higher than 21? Yea the most I've seen mine hold up top was 22.5psi. I do have .64 hotside I wonder if that has anything to do with it. Looking at a compressor map it looks like it could do 25psi before it's totally out of air.
Thanks for the post. DNM |
Originally Posted by DNMakinson
(Post 1581733)
You could pull the hose from the wastegate (plug it) and carefully find out the maximum potential. Just have to be careful around 4500 RPM for too much. This presumes the gate does not blow open, which would then only work with a higher spring or 4-port controller.
DNM |
Boost is the measurement of the restriction of flow. So it's not just the flapper being pushed open that could cause this.
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Originally Posted by 18psi
(Post 1581840)
Boost is the measurement of the restriction of flow. So it's not just the flapper being pushed open that could cause this.
I'm not gonna go with a .86 hotside I like the instant response too much. I still think I can hit 400 on it, but only time will tell. I'm having fun trying to unlock the last 25whp to get to 400. |
Looking at the compressor map... it looks tapped to me where you are at. I think you did quite well. You could ~maybe~ get more with a larger displacement motor, but not a lot more.
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Originally Posted by Ted75zcar
(Post 1581852)
Looking at the compressor map... it looks tapped to me where you are at. I think you did quite well. You could ~maybe~ get more with a larger displacement motor, but not a lot more.
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Originally Posted by andyfloyd
(Post 1581708)
Hmm, so you are using a ebc and even with 100 wg duty it still won't go higher than 21? Yea the most I've seen mine hold up top was 22.5psi. I do have .64 hotside I wonder if that has anything to do with it. Looking at a compressor map it looks like it could do 25psi before it's totally out of air.
Thanks for the post. And that’s why you could run a 2867 and pickup way more power with the same exhaust housing. |
Originally Posted by kamel6k
(Post 1581925)
When you’re Working around the “ineficient área” of the compressor map, it’s not the air temperature that’s killing your power, it’s the shaft speed and therefore the backpressure caused to achieve that shaft speed ;)
And that’s why you could run a 2867 and pickup way more power with the same exhaust housing. |
As I told you before, on the boost side I think you’re on the limit. I even used a two port wastegate, making it close as much as possible without much success. Maybe on colder weather could get a tad more. On the lower rpms I can shoot it to over 25 psi easy.
Your 400 on 98 can be possible with cams, or maybe just cam timing. What ignition timing are you runing at that boost level? |
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