CA P90 hopup
 

I recently installed a metal CA hopup in my E1 P90 in hopes of solving my midcap feeding woes. The issue is that the chamber is too tight so my Modify air nozzle gets stuck in the chamber. Should i file the nozzle or should I just get a TM chamber?

Id go for a TM chamber

are you talking about the Hop up system = chamber?

I have the CA metal hop up system for my echo 1 p90. The hop up doesn't align well with the nozzle. I wouldn't file it, there's a way on how to put everything back without being too tight.

Mind sharing this way? :)

1. First connect the (metal receiver) front kit in the receiver (body).
2. Put the Gearbox in the body, you may have to fiddle around with it till you get the right angel of the nozzle and the hop up. Then screw the gearbox.
3. Don't take the front kit of the P90 as you may not be able to put it back properly.

PS. You'll notice you'll get more FPS with stock hop up than CA hop up system, due to the alignment of the nozzle. It doesn't go in smoothly.

Thanks for the tip! Ill give it a shot once I'm home from work.

I've tired your technique cjboi but it is not working. No matter what I try nudging, when the gearbox is in the gun, there is little to no play. The nozzle still gets stuck. I'm tempted to bore out the hopup chamber with a drill...Or does anyone have a TM hopup they're willing to trade?

I dont, it works for me... that's what sucks about china brand guns lol.... never good quality control. My Echo1 P90 has CA metal hop up with Prometheus soft bucking and its not rubbing.

I have to put the front receiver first before I put the gear box in. When you put it in, you have to fiddle around with it till you get the best angle for your nozzle, so it wont hit a snag and break your nozzle. Keep trying dude, I know it works. When you find that angle then screw the gearbox in. Best in luck! :)

Its probably not a great help but if you do want a TM P90 Hop Up Unit TMC has them for the same price as CA ones, HOWEVER they are out of stock. I just emailed them about ETA for a new batch so hopefully they get back.

http://www.tokyo-model.com.hk/ecshop/goods.php?id=276

I didn't think CA P90 Hop ups had any installation trouble or this problem in general.

Also found this about P90 Hop Up Chambers...http://www.airsoftretreat.com/forums...;topic=86580.0

After over 2 hours of drilling and fiddling around and struggling to figure out why my gun was shooting sub 300fps, I've finally did it! I had to drill through the opening of the hop up where the nozzle goes in so the that opening is big enough for the nozzle to go ALL the way in. I found out the hard way that if I didn't drill far enough, the nozzle doesn't move far enough and thus I would get sub 300fps. Now even my MAG midcaps feed perfectly! I'm getting a really good rate of fire too using an element high speed motor, 11.1v 16C battery, and stock G&G M4 spring. From my exp., the chrony I use reads the ROF about 3-4 RPS slower than reality so I'm getting 30+ FPS! So in conclusion, DON'T buy the CA hop-up for you ACM p90 expecting a quick drop in fix! I haven't tired the TM hop-up but if it gave the same results for less work I would've gotten that instead! Next step would to be putting my stock spring back in to get the FPS up and installing that mosfet I have lying around before my trigger contacts fry to a crisp! Now back to that thing called school...

http://img821.imageshack.us/img821/9584/dsc03780y.jpg

http://img522.imageshack.us/img522/6053/dsc03776s.jpg

Metal is not always the best. I know TM and Echo1 hop up chamber are better than my CA lol. I get about 5-7 more FPS with the stock than the CA hop up chamber. I mean I would get echo 1 or TM but I cant find one that's in stock. My P90 is shooting 337-342 FPS anyways so I'm cool with that. Some people think CA is good internally, well I know for a fact that their P90 sucks internally.

Yes I do notice that the FPS is lower than before, significantly so (30 FPS lower IIRC). The tradeoff is my 170 rd midcaps feed perfectly now. And I disagree with you about the E1 chamber being superior to the CA. Besides the aforementioned tightness issue, the CA hopup has a rubber ring around the adjustment wheel which keeps the wheel tight and prevents it from straying from your preferred setting. My E1 hopup has way too much play and I always lose my setting.

Im not saying it's superior, what Im trying to say is E1 p90 hop up chamber works better. Maybe you got the ring other way around? Yes there is an oring for the adjustment chamber. It's weird though, I though I was the only one with fitment issue with my CA p90 chamber, guess I was wrong.

The term better usually implies superiority. In this case it sounded like you meant all around superiority but apparently not. There's no oring at all in my E1 hopup chamber, though I can see where one would go if E1's QA wasn't non-existant. From the looks of it, the CA hop up wasn't designed with ACM p90s in mind. The amount of metal I had to drill out for my nozzle to reach was quite significant. I also know for a fact that MAG midcaps not feeding in E1 p90s is not an issue exclusive to me: http://www.airsoftretreat.com/forums...0607.msg870229 I'm also curious CJ, what prompted you to switch to a CA hopup since it seems u have much better luck with the stock hopup than I did?