JWoodley said:

I highly recommend these guys: eBay Motors: F7 T3/T4 -4 AN REGULATOR Turbo Oil Inlet Flange+Gasket (item 150288646995 end time Mar-20-09 03:41:25 PDT)

I won that auction and will be using it on my setup in the next few weeks.

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kawboy said:

That's exactly the restrictor I'm using

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Are you guys feeding from the head or the ofh? No balance shafts? I am thinking of picking one of these flanges up for my setup, I will be feeding from the head, with no balance shafts, unported oil relief.

projecTSI said:

Are you guys feeding from the head or the ofh? No balance shafts? I am thinking of picking one of these flanges up for my setup, I will be feeding from the head, with no balance shafts, unported oil relief.

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I'm feeding from the OFH, no balance shafts, with a lightly ported relief valve.

Not to change the ongoing feed questions but... this turbo really kicks ass. I did however find te limit of my COP. I had a real bad miss after 18 psi. The tune was solid. So I went to the stock setup and 24 psi with no problems now. Running zeor knock with 18 degrees of timing at 7000. I think I could add timing but it should be perfect curve for my 65 shot. I will have track times this weekend if I dont blow up.

Good job. Glad you like the setup. At the end of the day what matters most is how happy your efforts made you.

Matt you got that HX35 installed yet

Alright, well I had a few minutes at work tonight to play around.....So I went on the hunt for a plug that I could drill out to make a restictor....Low and behold, I found the absolute perfect size fitting, correct thread pitch, and I found an oring that fit perfect and is very snug in the turbos recess......So after center punching the hole I started to drill....I ended up going with a .72 hole just to make sure there is enough oil.....



Then I decided well, maybe if I add a small chamfer to the hole it will help flow a little better, maybe not but oh well, better be safe than sorry.....



So what I have to do now is cut the end off the extremepsi fitting I have and weld basically the two nuts together.....



Pretty easy in the end.....

-Kevin-

Looks like it worked out!

Ok guys, I plan on pulling this cover off next time I'm home and finding out once and for all if I paid for an 8-blade HX40 or ended up with a small wheel HX35/H1c.

Does anybody have a description (or a link from previous threads) of how to measure the comp wheels and what the correct measurements are for each Holset?

Ok...quick question...

How much oil pressure do you generally lose from the OFH to the head?

I'm now running my new holset on the head (no restrictor) and I have my defi oil press gauge at the oil filter housing.

At idle i'm around 20psi, and at cruise I'm at 60-80psi depending on rpm range (3-4k) and sometimes on decel (rev-matching) or wot i can see 90+psi. This of course is being read at the OFH, so what is my head seeing?

I think you should just move your oil gauge to the head and rev it in neutral to find out where your oil pressure from the head will be before spool and after spool. Before spool it can be as low as 10psi. After it needs to be atleast 30psi but no more than 72psi.

kraka said:

Looks like it worked out!

Ok guys, I plan on pulling this cover off next time I'm home and finding out once and for all if I paid for an 8-blade HX40 or ended up with a small wheel HX35/H1c.

Does anybody have a description (or a link from previous threads) of how to measure the comp wheels and what the correct measurements are for each Holset?

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How to measure the inducer and exducer of the wheels.

H1C inducers: 45mm 7blade (baby), 50-52mm 8blade (small), 54mm 8blade (big), 56mm (WH1C)

Hx40: 56mm 6blade, 58mm 8blade, 60mm 7blade and 6blade

Hx35 inducers: 56mm 8blade (52lb/min), 56mm 7blade (57lb/min)

NOTE: I just got an hx35 from UGOT8UP (thanx Richard!). It has a 54 8bladeinducer with a 82mm exducer. The 56mm 8blade hx35 has an 84.5mm exducer. that looks identical to my big h1c, which also has an 8blade 54mm wheel. The big h1c has the webbing for the MWE groove, but no groove cut through. But the 54mm hx35 has the grove cut in the webbing. So basically this is a big h1c with functional MWE porting. This compressor flows about as much as a 50trim since the wheel is identical to the big h1c.

Gillett Diesel mentions this:


Here are pics of the wheels. The big h1c is on the left and the 54mm hx35 is on the right:

Though the turbine wheels have the same silhouette (same diamters and contour between the diameters) and thus both will fit in the same housing, there are distinct differences.

Difference in thickness:



Difference in blade tip aerodynamics:




The lighter, thinner blade wheel could very well increase spool speed. The better aerotech on the blade tips allows the gases to flow over the blade tips less disrupted; this increases maximum flow because the flow is more organized.

. . . Back to my auto-to-manual conversion.

Wow. Someone needs to make a sticky of these last two posts or least link to them in the summary at the begining of this thread. There is no way in hell I will be able to remember where this is when im actually going to need it.

The sad part is both of those turbos are rotor balanced, which means you can't just swap wheels without having to rebalance your turbo afterwards.

Unless of course you wish to rely on a scribe.. which I don't reccomend when you're spinning these turbos fast and with hot gasses

If it makes a difference the turbo came off of a Timber Jack feller buncher with a Cummings engine, most likley mid-late 90's model.

the newer holsets are component balanced, as i was told by justin. i have been playing mix and match with about 5 holsets that i have. so far my current match is going to be a Volvo 16cm hotside with a CHRA that came off of a 56mm hx40 and a 60mm billet compressor wheel and cover that came from mike1992

If anyone has any/a spare twin scroll 16cm housings, I'm in the market.

Cs4g63 said:

Wow. Someone needs to make a sticky of these last two posts or least link to them in the summary at the begining of this thread. There is no way in hell I will be able to remember where this is when im actually going to need it.

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Just remember that the h1c turbine wheel spools slighty faster than the hx35 turbine wheel but the hx35 turbine wheel flows slightly more. And remember that no h1c comes with a compressor inducer larger than what is already on an hx35. So there's no need for swapping. Putting an h1c compressor on an hx35 will never be an upgrade, but COULD be a downgrade. AS well the hx35 takes a different rebuild kit than an h1c so I don't know if the swap would even be possible.

I posted some results in the other thread. Hopefully next week Ill have some faster times to post. The car is making good power though based on weight and trap speed. I also hope to have an official dyno sheet within the next month.

dsm-onster said:

Just remember that the h1c turbine wheel spools slighty faster than the hx35 turbine wheel but the hx35 turbine wheel flows slightly more. And remember that no h1c comes with a compressor inducer larger than what is already on an hx35. So there's no need for swapping. Putting an h1c compressor on an hx35 will never be an upgrade, but COULD be a downgrade. AS well the hx35 takes a different rebuild kit than an h1c so I don't know if the swap would even be possible.

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I definately appreciate the information, but it was more for the fact that it has the helpful little info and specs than anything else. I wouldnt ever want to do that swap at any point.

No problem. Just giving help where needed. As you can tell, we're a tight knit community. What works for us probably is the collective effort that other "subgroups" don't have.

blacksheep86 said:

I posted some results in the other thread. Hopefully next week Ill have some faster times to post. The car is making good power though based on weight and trap speed. I also hope to have an official dyno sheet within the next month.

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And they are good results. About 120mph with your mods, weight, and boost with a bolton hx35 is VERY good. If you feel that you can do better, then that is a testimony to the berated bep bolton housing. It is a very good housing match to the hx35 and has served very well. No one can complain. I'll be reluctant to sell my bolton hx35 to help fund my twin scroll hx40 build. After runnign a 50-trim, evo3 16g, small 16g, and td05h 18g, I swear! the bolton hx35 is the BEST balance of power and spool I've ever personally used. There's no turbo that spools that fast, hits that hard, and flows that well up top at low or high boost that comes close. I think the s256 bolton and the fp3052 are INCREDIBLE turbos, but based my personal comparison of 500whp turbos, the hx35 in the bolton housing at least matches these turbos.

I definately think I can run a better time. The timing is rather conservative on its current tune and I want to put the car on a mini diet and go with less gas. The gas is another thing. I think since I'm running grade 3 E85 (E77 for easier winter starting) it will help in June when we get actual E85. I also want to try out a different intercooler core. I'm not sure about the punishment (CX racing) core yet, and I want to try a bigger ETS core. Hopefully you will see and 11 second time slip from me with a little less weight within the next month or so, but we'll see if I can't do better next week on the current setup.

I built a 2G w/ 6bolt with my old HX35 w/BEP bolt-on housing. I feed it from the head. Motor was running no balance shafts and the forward facing oil filter housing. Had zero issues with oil pressure. The same turbo running the oil feed from the OFH unrestricted with -4an feed line the turbo would pass oil in the upper RPM range where the oil press was fairly high. I also had the oil filter housing relief hogged out about as far as you could port it. And I really mean that. It's a waste of time to port the OFH if you ask me. I've been their and done that. I have a ported 90 OFH to prove it that is going to waste now.

blacksheep86 said:

I definately think I can run a better time. The timing is rather conservative on its current tune and I want to put the car on a mini diet and go with less gas. The gas is another thing. I think since I'm running grade 3 E85 (E77 for easier winter starting) it will help in June when we get actual E85. I also want to try out a different intercooler core. I'm not sure about the punishment (CX racing) core yet, and I want to try a bigger ETS core. Hopefully you will see and 11 second time slip from me with a little less weight within the next month or so, but we'll see if I can't do better next week on the current setup.

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You definitely have the MPH to run in the 11s. Work on your 60' time. Wasnt it like 1.9xx? Good job for your first time out!

Maglin said:

I also had the oil filter housing relief hogged out about as far as you could port it. And I really mean that. It's a waste of time to port the OFH if you ask me. I've been their and done that. I have a ported 90 OFH to prove it that is going to waste now.

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A waste? I went from 110psi at WOT to ~80psi

guys got a couple videos up after the holset/stroker/jacks/PTT install check them out in the hangout/video forum!

kraka said:

A waste? I went from 110psi at WOT to ~80psi

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And that is still to much oil pressure for a turbo. That is why I'm saying it's a waste. I did lower my upper end oil pressure but past 9K I'm actually wanting to maintain the 10 psi/1K rpm addage for proper oil pressure.

I went with a FFF Bracket on the last build and it worked better than the stocker for oil pressure control. I'm going that route this time along with the alternator relocation so I have plenty of room for the 4" exhaust and EWG downtube. Not to mention it just looks a lot cleaner with no accessory on the front of the motor.