HX-40 .70ar housing spool time

[jakk220]

So I recently switched to a .70ar housing from the .55ar on my 8 blade 58mm HX-40 and I was wondering what spool times some others are seeing. I have a log attached for review but it seems like I am not getting to full boost (34psi) until 5500rpm or so. I was just wondering if this is normal or if I should start looking for an issue. I fixed a boost leak I had before the log and it does not appear that I have any exhaust leaks. The wastegate has a 15psi spring in it and does not sound like its cracking open early. It just feels a little laggier than I thought it would be. Car is currently on a stock intake manifold and a ported t3 cast exhaust manifold. 9:1 compression pistons and e85 as well.

I have attached a 1-4 with launch as well as a sweeping 3rd gear. AFRS are .3 leaner on link than they actually are and im currently working on getting them adjusted. Thanks for the input.

 

[Archer Fabrications]

My 7 blade in the .70 AR didn’t see 40psi til about 5600+ish

Check if it’s leaking boost behind the compressor cover on the snap ring though

 

[jakk220]

My 7 blade in the .70 AR didn’t see 40psi til about 5600+ish

Check if it’s leaking boost behind the compressor cover on the snap ring though

When I boost leak tested it the compressor housing was part of the test. Seemed to be holding fine at 25psi. I guess maybe that's just how it spools. But I saw some we're seeing 20psi by 4500 and I'm only seeing like 11. Don't get me wrong it pulls pretty damn hard, but I just though with an 8 blade and 9:1 compression I would be seeing 35psi a bit sooner. Maybe I'm wrong though

I did notice around 6psi at WOT 3700 -4000 rpm my exhaust note gets raspy for maybe 1-2 seconds. Kind of like a Honda rasp. It's a deep note, then raspy, then deep again. And when that happens the spool seems to fall on it's face for a second. The AFRs seem okay though. Could it be a timing thing or is that normal?

 

[1990TSIAWDTALON]

I will see if I have a log on my zip drive, if so I will post it to review. It would be from a .70 T3 7 blade is the only difference.
I will look in a bit, ......at work now.
Yes......I have a job

 

[1990TSIAWDTALON]

Here is one I found. E85, 1650s, T3 .70 housing Open HX40, Kelford 264's .....
I am all in at 36 lbs by 4800. It hits like a freight train when it lights.....
I can't find a 40 lb log on my zip drive but there is a 41 lb one at home on the laptop.

 

[jakk220]

Here is one I found. E85, 1650s, T3 .70 housing Open HX40, Kelford 264's .....
I am all in at 36 lbs by 4800. It hits like a freight train when it lights.....
I can't find a 40 lb log on my zip drive but there is a 41 lb one at home on the laptop.

Thanks! I'll have to look at it when I get to the computer. But what in the hell am I doing wrong here.... Everything seems to check out but I cant get to that kind of boost until 5500. Maybe it's because you are 10:1 and have smaller cams?

 

[1990TSIAWDTALON]

Those Kelfords are a good running set of cams. I am putting them into my auto build and the K272's are going in the red Profile car.
Keep us posted on what you think is going on. I am glad I am all in at under 5k.
My log was a pull to 8200 or so in 3rd at somewhere around 111 mph.

 

[jakk220]

Those Kelfords are a good running set of cams. I am putting them into my auto build and the K272's are going in the red Profile car.
Keep us posted on what you think is going on. I am glad I am all in at under 5k.
My log was a pull to 8200 or so in 3rd at somewhere around 111 mph.

Yeah I would love to see that kind of spool. I'm brainstorming a few things at the moment. My best guesses so far are my cams need degreed l, my tune is off somewhere, or that's just how this thing spools. If I can get it to come in at 5k I'd be happy honestly.

 

[1990TSIAWDTALON]

I ran an 8 blade and it came in even earlier than this 7. Something is amiss, I just am not sure what.

 

[jakk220]

I ran an 8 blade and it came in even earlier than this 7. Something is amiss, I just am not sure what.

Honestly though with the smaller cams and 10:1 that might be why you see it so soon. Huge difference in the set up.

 

[1990TSIAWDTALON]

What cams and What compression ratio are you running? I had a Evo3 intake also.

 

[jakk220]

What cams and What compression ratio are you running? I had a Evo3 intake also.

272 crowers and 9:1 compression. I actually just bought an Evo 3 intake mani and 1g tb but they are not on yet

 

[1990TSIAWDTALON]

Nice combo. Wish I had built another 2g head so I could use my Evo intake on the auto car but I built a 1g head for it
The 60mm TB will help too!
Have a look at the difference in our cams also. Although those Crower 272s have a little more duration, their lift is ALOT less than the Kelford 264s....which helps me injest more air.
My car was in the 10 second range with that setup but I am going with Kelford 272s and a JMF Race manifold for her. She should click one off easy, I am hoping.

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[jakk220]

Nice combo. Wish I had built another 2g head so I could use my Evo intake on the auto car but I built a 1g head for it
The 60mm TB will help too!
Have a look at the difference in our cams also. Although those Crower 272s have a little more duration, their lift is ALOT less than the Kelford 264s....which helps me injest more air.
My car was in the 10 second range with that setup but I am going with Kelford 272s and a JMF Race manifold for her. She should click one off easy, I am hoping.

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Interesting information to know.

Wouldn't the 1g TB and the Evo III intake manifold make me spool slower but flow better? I really can't sacrifice any more spool haha. I can see 20psi by like 4500k if I load up 5th gear but that's about it. Also my head is stock other than the cams .

I had the car back at the track today and it trapped at 125ish. I had a blown out front roll stop and I'm on street tires so I could only get a 11.7 1/4 mile and a 2.0 60ft. I had a 124 trap with the .55ar so I feel like I didn't gain much other than lag. It feels faster but it's not faster.

I was spinning 1st and 2nd at the track and wheel hopping like a mofo. I need slicks but still. I feel like it should crack a 10.99. I'm also only seeing 3psi off of a 5500 2 step. It takes a mild anti-lag for me to get to 9psi.

 

[1990TSIAWDTALON]

I saw that 3 psi at the launch. Can you advance timing anymore on the antilag? Enrich the mix by 10-12%? I could stand on my setup and get a hell of a lot of boost, way to much to use on the launch. I have a small farm so I take my car to my "test pad" area that is grass and practice with the antilag. I've built 20 lbs before but grass and dirt flies everyware .
My setup was giving me 1.375 70-90 times but I don't have a 10 second slip yet since my crank pulley walked forward and I bent all 16 valves. Still waiting to get that head back.

 

[Vegas Smith]

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This guy is running a BEP 70 housing.

 

[MindBlowin03]

8.5:1, HKS 272s and 60mm T3 HX40 and I see 40 psi somewhere near 5500 RPMs.

 

[jakk220]

I saw that 3 psi at the launch. Can you advance timing anymore on the antilag? Enrich the mix by 10-12%? I could stand on my setup and get a hell of a lot of boost, way to much to use on the launch. I have a small farm so I take my car to my "test pad" area that is grass and practice with the antilag. I've built 20 lbs before but grass and dirt flies everyware .
My setup was giving me 1.375 70-90 times but I don't have a 10 second slip yet since my crank pulley walked forward and I bent all 16 valves. Still waiting to get that head back.

Oh I can make it see 20psi . The 3psi was only 2 step not anti lag. I'm lighting up the tires with just that 3psi so right now I don't need anything more .

I wish I could see the spool that guy in the video is. That's nuts.

8.5:1, HKS 272s and 60mm T3 HX40 and I see 40 psi somewhere near 5500 RPMs.

Awesome thanks for the input. That's about where I see 35psi so really that's not too far off where I'm at.

 

[1990TSIAWDTALON]

I see the video guy is running her on the edge on afr's....hmmm....reminds me of someone.... but they sure run there.

 

[jakk220]

I see the video guy is running her on the edge on afr's....hmmm....reminds me of someone.... but they sure run there.

I dont get too alarmed when I see those AFR's but then again I'm on corn. So I checked over everything again and found the Vband for the 02 housing was a little loose. The clamp had stripped out. However that's post turbine so I doubt it was causing any slower of a spool. I didn't hear it leaking but then again with me now running VTA with my wastegate I can't hear jack . Everything else still seems to check out.

A friend of mine just bought the dial for degreeing cams. I might do mine and see if they are off.

 

[1990TSIAWDTALON]

Corn here too but those lean afrs will make stuff "glow"

 

[deboelduro]

Very interesting how everyone is seeing full boost at different rpms. The 6 blade hx40 or 6266 are definitely my next choice