From boost control to none and huge creep
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From: Washington
I've always thought rx7's were light
Here is a pic showing the two
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From: Norn Iron
Looks feckin huge by comparison ! lol
Although interesting that the gap ring outside the impeller OD is quite small on the race compared to the normal cover.
Someone suggested this smaller gap was less efficient on the SXE range of turbos as it was smaller than the older BW's It would seem that theory is well out the window.
Although interesting that the gap ring outside the impeller OD is quite small on the race compared to the normal cover.
Someone suggested this smaller gap was less efficient on the SXE range of turbos as it was smaller than the older BW's It would seem that theory is well out the window.
That's the gen 2 race cover which is indeed huge even compared to the John Deere race cover. I have the same cover on my 76mm and it looks like it's atleast an 88 or bigger turbo !
Looks feckin huge by comparison ! lol
Although interesting that the gap ring outside the impeller OD is quite small on the race compared to the normal cover.
Someone suggested this smaller gap was less efficient on the SXE range of turbos as it was smaller than the older BW's It would seem that theory is well out the window.
Although interesting that the gap ring outside the impeller OD is quite small on the race compared to the normal cover.
Someone suggested this smaller gap was less efficient on the SXE range of turbos as it was smaller than the older BW's It would seem that theory is well out the window.
I guess I'm not sure for sure what you mean
The diffuser is the flate plane after the OD of the exducer
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So these are my options. Gates are place mid car'ish about water pump level. I can go out the passengers side like it is now, I can squeeze twin 2 inch pipes but merging into a single 2-1/2 would be awesome, even a single 3 inch coils work. To get it outside the frame rails I need 24 inches and out the fender I neee 36 inch total length
I can do a 180* down under the car and come out the drivers side, but still need the 24 inches to clear the frame rails but looks like it would be easier to fab and if I went 36 inches of pipe I can clear the tire
I can do a 180* down under the car and come out the drivers side, but still need the 24 inches to clear the frame rails but looks like it would be easier to fab and if I went 36 inches of pipe I can clear the tire
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From: Norn Iron
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I think on this new setup, I'll run one gate to the passenger side and the other gate to the drivers side. This will free up some space I need for other tight fitting stuff. I'll run 2-1/4 from each gate, this will allow me to still use the piping for the current side and I almost have enough piping for the drivers side
And if I can get my welder in the spots needed, I'll add like a tube radius gusset to the 90* Wastegate pipes, opening this up for better flow potential as well. Especially the pipe that's on the inside of the flow path
And if I can get my welder in the spots needed, I'll add like a tube radius gusset to the 90* Wastegate pipes, opening this up for better flow potential as well. Especially the pipe that's on the inside of the flow path
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Picked up one of the PW46 gates tonight. The valve seat is .075 larger and the valve strokes .050 more. So for being a bolt on gate it's got way more flow potential. The china weld flange, china clamp, and the pte gate bolts up
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So I slept on last nights findings, and kept looking this morning at the system. I wanted to get the old gates off and see about new gate fitment. Sure enough, the PTE top is larger and kinda interferes with turbo elbow and clocking for good dump pipe position
This got me looking at the china gate again. Out of the dozen or so in the local group only one has stuck open. At the price of the china gate, i actually keep a spare in the tool tote. That said, I really don't have the money to purchase the second pte gate i need at the moment. So I compared both gates again. The pte fire ring is abiut 42mm on the id, the china gate is 40.5. I was able to turn the fire ring out this morning to match the pte setup. Now for the stroke. There is lots of room in the china gate before coil bind, about 3/8 inch. So I then put the gate in the lathe and machines .100 off the valve guide, giving me more stroke than the pte setup.
So since the pte and china gates interchange, I'm moving forward with the modifying the china setup and will route larger twin dump pipe
I also found a huge restriction this morning. I bought from Columbia a 1-3/4 flex pipe for the Y connection on the gates. It had the internal stainless mesh, take a look at the picture and see what happened! No more mesh flex for me, just the interlocking style if I need them
This got me looking at the china gate again. Out of the dozen or so in the local group only one has stuck open. At the price of the china gate, i actually keep a spare in the tool tote. That said, I really don't have the money to purchase the second pte gate i need at the moment. So I compared both gates again. The pte fire ring is abiut 42mm on the id, the china gate is 40.5. I was able to turn the fire ring out this morning to match the pte setup. Now for the stroke. There is lots of room in the china gate before coil bind, about 3/8 inch. So I then put the gate in the lathe and machines .100 off the valve guide, giving me more stroke than the pte setup.
So since the pte and china gates interchange, I'm moving forward with the modifying the china setup and will route larger twin dump pipe
I also found a huge restriction this morning. I bought from Columbia a 1-3/4 flex pipe for the Y connection on the gates. It had the internal stainless mesh, take a look at the picture and see what happened! No more mesh flex for me, just the interlocking style if I need them
Perhaps the failed flex was most of your problem?
I bought my flex from Columbia as well. I recall seeing bellows inside, not mesh.
But it's been 3 years. I've noted when I've had things apart that they are now VERY flexible. But I can't see inside them.....
Maybe I'll borrow the bore scope from work and have a look.
I bought my flex from Columbia as well. I recall seeing bellows inside, not mesh.
But it's been 3 years. I've noted when I've had things apart that they are now VERY flexible. But I can't see inside them.....
Maybe I'll borrow the bore scope from work and have a look.
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From: Washington
The flex pipes on my turbo hot pipes have the flexy type muffler pipe on the inside, but I'm able to get a scope down there so i to am going to check those out. I knew the Wastegate had the mesh but thought, meh, it'll be ok! Apparently not!
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On the thought it could have been the problem. I'm on the fence with that. it really depends on when it happened last year I guess. End of season it took 70%dc to make 18psi on a 10lb spring. But I spent most all season getting things sorted. This year it took 50%dc to make 18lbs on the standard cover. So now we know that cover sucks with flow and the ETS cooler is more efficient than the frozen boost unit
That's what I have on my hot side as well. Thanks for jogging my memory.
We had one of those fail on a turbo Jeep at the shop. Has lots of engine movement though.
Keep up the good work. I wish I had 1/4 of your energy.
We had one of those fail on a turbo Jeep at the shop. Has lots of engine movement though.
Keep up the good work. I wish I had 1/4 of your energy.
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From: Washington
Update to this problem
Issue is fixed. Went to the track on Friday and Saturday. Car runs 10lb on Wastegate spring even with some boost help to get there. I'm even back to 55ish % boost Duty to make 220kpa.
I ended up taking about an hours time and machining my china wyntomm gates to match the specs of the precision 46mm setup then ran 2-1/4 pipes right from the gate to each side of the car
Now the only problem is traction at peak tq in low gear!
I worked with traction control strategy and getting a handle that
Issue is fixed. Went to the track on Friday and Saturday. Car runs 10lb on Wastegate spring even with some boost help to get there. I'm even back to 55ish % boost Duty to make 220kpa.
I ended up taking about an hours time and machining my china wyntomm gates to match the specs of the precision 46mm setup then ran 2-1/4 pipes right from the gate to each side of the car
Now the only problem is traction at peak tq in low gear!
I worked with traction control strategy and getting a handle that
Good news! Now we just need some weather to go racing.
Well, a track with prep would help too.
ETS is building me a new intercooler. Will have more than 2X my present core size.
its good to have connections.....
Well, a track with prep would help too.
ETS is building me a new intercooler. Will have more than 2X my present core size.
its good to have connections.....
I KNOW you're gonna show how you stuff double the core in a Nova...right?