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2G Hx40 auto super laggy

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You done a boost leak test? My old hx40 had a leak at the back or the compressor
Cover causing mass lag til I fixed it Something to think about.

You should definitely be seeing 30psi by 4800 max, I made 40psi on the .70 AR at about 5500. Theres definitely something going on. It should be a quick spooler, but drop off st the top end. Or be knock happy past 30psi on pump gas. But absolutely no reason to be seeing it at 6300
Yea only boost leak I found was a throttle shaft seal leaking a little but not anything I'm worried about. Idk what else could cause slow spool. Turbo was recently rebuilt and had the turbine clipped a little to help last in the small housin . Guess that's something justin does on all hx40s to help them last a little longer when stuffed in the .55 housing.
 
So today I decided to make sure wastegate wasnt able to open and went and did a pull and still didnt spool any quicker so that eliminates that theory. So wastegate isn't the cause of i . Only thing is really the converter but when on the brake it comes online quick. Maybe because its loading the engine harder on the brake causing it to spool up easier. I'd hate to spend the money to go t3 and have the same problem but wors . I just dont see how going t3 would help my issue
 
So today I decided to make sure wastegate wasnt able to open and went and did a pull and still didnt spool any quicker so that eliminates that theory. So wastegate isn't the cause of i . Only thing is really the converter but when on the brake it comes online quick. Maybe because its loading the engine harder on the brake causing it to spool up easier. I'd hate to spend the money to go t3 and have the same problem but wors . I just dont see how going t3 would help my issue
you disconnected the vac line to make sure the gate wouldnt open? or how did you do this? is it possible you have an obstruction before the turbo? ( in manifold or turbine housing) saw a post from mealing racing that had a hose clamp wedged in his turbine housing. somethign to think about.
 
And I would be willing to bet you will see less lag with the t3 housing vs the .55. like the early precision dsm flanged housings, the bullseye isn't great either. Yes it's a "bolt on" piece, but it sacrifices a lot everywhere to "bolt on".


O.p. is your housing machined for an internal gate with a flapper that's welded or tied closed?
An open t3 .70 hotside 60mm hx40 spooling before 4500 sounds extremly early, most t3 .70 hx40 seem to full spool around 4700-4900rpms. But I agree, the .55 bolt on hotside is inferior to the t3.
 
you disconnected the vac line to make sure the gate wouldnt open? or how did you do this? is it possible you have an obstruction before the turbo? ( in manifold or turbine housing) saw a post from mealing racing that had a hose clamp wedged in his turbine housing. somethign to think about.
I switched the port from bottom to the top to force it closed. And no no obstruction . Had the turbo of maybe a month ag .
 
Ok so I emailed them at sinister and like I thought this converter isn't ideal for my combo they way it sounds. I'll have to get some info for him to calculate my slippage on it and go from there. Gonna see if I can send this in and maybe get it setup better for my car or if it's just cheaper and easier to just buy one designed more for my setup.
 
After more research on their end come to find out it's an old original 8" core. Being on a budget he recommends sending it in for the tightening up the offered with a different stator. He said it'll help tighten it up with less slippage then an ipt converter but will still have the high stall like it currently has maybe 500rpm lower. So hearing my combo I plan to run he said itll be a pretty crazy street car which I'm happy to hear cause that's all I wanted this car to be.

Itll be nice being able to spool up the hx40 in the .82 housing just as easily as in the .55 housing. So from a dig the car will be an animal but its gonna suck from a roll which I dont really care. I love launching 20psi from a dig. Just thought I'd update everyone who was following. I just gotta bring myself to pull the converter and send it in before summer is fully here.
 
Nice of you to tell the story, so the thread has some meaning and results!
Good luck, can't wait to see some times on the beast! :thumb:
 
You can run a mbc to both ports. It’s how I ran 45psi on a 15lb spring.
Can you explain how this works. I was trying to wrap my head around it but not sure what's going on there. Is it allowing you to keep pressure on the top port? If that's the case, you're using 2 mbc's, and if so.... what do adjustments do when you change the setting on the lower port vs. the upper port? Thank you.
 
Run manifold pressure to the top port. Tee off that line to a ball and spring mbc, and run out of the mbc to the bottom port. Your minimum boost is now whatever blows the gate open with no lines run to it (usually 2x spring pressure), and your max boost is whatever the turbo can do.


With a 1bar spring my minimum boost was 32ish, and I could run 40-45 no problem.



What it does is keep the gate shut until the mbc opens, then you get equal pressure on both sides of the diaphragm which is the same as running no lines.
 
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