Went single and lost horsepower
08-13-12, 12:08 AM
#26
No money. No love.
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Like many have said boost leaks are a HUGE culprit and you don't even think about them. My car built boost really slow and the power wasn't there, but when I did a boost leak test (super cheap with a rubber sewage pipe end and a tire valve) I found a leak from the uim to lim gasket, throttle body gasket, and one of my intercooler pipes was loose. After fixing those leaks the car felt like a MONSTER.
Same story with my buddy's car. He had his mbc cranked up and the car held 12 psi fine, but the power wasn't there and it ran kinda rough. Fixed the boost leaks and his car hit 20psi for a split second. We re-dialed in the boost and the car was a whole new beast.
Same story with my buddy's car. He had his mbc cranked up and the car held 12 psi fine, but the power wasn't there and it ran kinda rough. Fixed the boost leaks and his car hit 20psi for a split second. We re-dialed in the boost and the car was a whole new beast.
08-13-12, 06:24 AM
#27
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Wait, its got a 1.0 AR and he's saying its laggy?
Somethings way not right here. we need the full timing cuve, even idle, and your timing split
What ignition amplifier?
Somethings way not right here. we need the full timing cuve, even idle, and your timing split
What ignition amplifier?
08-13-12, 07:02 AM
#28
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Look for boost leaks. I too had many leaks and recently fixed them. The difference is very noticiable.
You will likely need a compressor, I don't think a mitty vac has enough flow.
You will likely need a compressor, I don't think a mitty vac has enough flow.
08-13-12, 10:32 AM
#29
Elltiot I did a compression test a few months ago right before i began the build and turned out good. Im going to hopefully rig up pressure tester today and get to the bttom of this. I will also try to have my friend email me a snap shot of my tune and post that up as well. Stay posted
08-13-12, 02:09 PM
#31
leading plugs not firing
boost leak
restriction in intake or exhaust(can even be the turbo, spin it when cold and when hot and see how freely it spins)
those are what come to mind to me first. the timing would have to be stupid retarded to drop off that much power nor is the AFR being a tad rich going to dump that kind of power.
boost leak
restriction in intake or exhaust(can even be the turbo, spin it when cold and when hot and see how freely it spins)
those are what come to mind to me first. the timing would have to be stupid retarded to drop off that much power nor is the AFR being a tad rich going to dump that kind of power.
08-13-12, 04:09 PM
#34
I finally was able to do a pressure test. I went out today and bought a compressor, some fittings and a few plumbing caps. The setup worked nice and I DEF have some leaks. I pressurized the tank to about 40psi and then attached the adapter. The noise made it obvious that there was a leak. When de-pressurized I couldnt build more than 10psi with the compressor on due to the leaks.
1) There was a small leak at the first coupler from the turbo right before the I/C. Easy fix.
2) There is a HUGE leak comming from the primary injector area. I have no clue what it is yet. I have my pressure regulator source taped in the stock nipple down there but I doubt thats leaking. It almost seems like the primaries are leaking air. I should also note that a strong fuel smell was evident right in the begining and went away. I didnt see any fuel but the smell has me worried.
3) I also have some weird rumbling deep tone noise which sounds like is coming from the brake booster. I couldnt feel any air leaking but dont know if the noise is something I should worry about. At difference angles it sounded like it was either from the booster or under the greddy elbow. Its not a major leak if it even is a leak.
I did completely re-do my fuel setup. KG secondary rail w/ re-done bosch 1680 secondaries. Stock primaries which I took out, cleaned and did the Banzai fuel pulsation dampner delete. Still have the stock OMP and oil injectors.. dont know they could possibly leak air or not.
A major leak is coming from this area at the buttom. Note that I still have a bunch of stock twin solenoid harnesses. The T-fitting is for a small breather filter I put for the oil injectors.
And here is a pick of basically all you need to do a nice pressure test. I used a 4inch plumbing cap, 1/4 NPT adapter (male). Drilled a hole and tightened the fitting into the rubber. No leaks from the cap even at 50psi.
1) There was a small leak at the first coupler from the turbo right before the I/C. Easy fix.
2) There is a HUGE leak comming from the primary injector area. I have no clue what it is yet. I have my pressure regulator source taped in the stock nipple down there but I doubt thats leaking. It almost seems like the primaries are leaking air. I should also note that a strong fuel smell was evident right in the begining and went away. I didnt see any fuel but the smell has me worried.
3) I also have some weird rumbling deep tone noise which sounds like is coming from the brake booster. I couldnt feel any air leaking but dont know if the noise is something I should worry about. At difference angles it sounded like it was either from the booster or under the greddy elbow. Its not a major leak if it even is a leak.
I did completely re-do my fuel setup. KG secondary rail w/ re-done bosch 1680 secondaries. Stock primaries which I took out, cleaned and did the Banzai fuel pulsation dampner delete. Still have the stock OMP and oil injectors.. dont know they could possibly leak air or not.
A major leak is coming from this area at the buttom. Note that I still have a bunch of stock twin solenoid harnesses. The T-fitting is for a small breather filter I put for the oil injectors.
And here is a pick of basically all you need to do a nice pressure test. I used a 4inch plumbing cap, 1/4 NPT adapter (male). Drilled a hole and tightened the fitting into the rubber. No leaks from the cap even at 50psi.
08-13-12, 04:50 PM
#36
the primaries aren't sealed very well with the stock primary rail, i never was a fan of those seals they put into the block. try some o-rings on the rail itself where it pushes against the block to help seal the primary rail.
not sure about the booster, i would try vacuum testing it to see if it holds vacuum. if it is leaking it can cause a quite substantial leak.
not sure about the booster, i would try vacuum testing it to see if it holds vacuum. if it is leaking it can cause a quite substantial leak.
08-13-12, 05:42 PM
#37
the primaries aren't sealed very well with the stock primary rail, i never was a fan of those seals they put into the block. try some o-rings on the rail itself where it pushes against the block to help seal the primary rail.
not sure about the booster, i would try vacuum testing it to see if it holds vacuum. if it is leaking it can cause a quite substantial leak.
not sure about the booster, i would try vacuum testing it to see if it holds vacuum. if it is leaking it can cause a quite substantial leak.
I wasnt aware that air could leak from the injector area. I know there isnt fuel leaking but given the moment of fuel smell during the pressure test I know its comming from that general area..I just dont know if it is the injectors themself. I will go ahead a change the o-rings and do my best to seal them. Before I do that though I need to wait for a friend to come help me pinpoint the exact place the boost leak is coming from.
Just to be sure, there is no reason why air should be leaking from that area correct?
08-13-12, 05:50 PM
#38
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I am not sure if I would go that high with the pressure. Anyway I had a leak in that area that you described. I too could smell gas, and it ended up being a torn vacuum nipple.
Once you have fixed the big leaks you can easily hear go back through the car and spray your couplers, elbow, throttle body and so on. Just use soapy water. If you have a leak they will bubble like crazy. I made a sud fest on my throttle body lol.
Once you have fixed the big leaks you can easily hear go back through the car and spray your couplers, elbow, throttle body and so on. Just use soapy water. If you have a leak they will bubble like crazy. I made a sud fest on my throttle body lol.
08-13-12, 05:58 PM
#39
yea after doing the test I refleced back and realized 40psi is kinda extreme lol. Which nipple exactly are you reffering to? The one attached to the block? or is it related to the fuel system?
After I get this major leak fixed I will move on to the smaller possible leaks. Suprisingly the synapse BOV help up great even at a slightly angeled mount. I was thinking the BOV was going to be the main leak source.
After I get this major leak fixed I will move on to the smaller possible leaks. Suprisingly the synapse BOV help up great even at a slightly angeled mount. I was thinking the BOV was going to be the main leak source.
08-13-12, 06:10 PM
#40
40psi of tank pressure doesn't necessarily translate to 40psi of intake pressure. it is a huge void to fill.. even my 80 gallon compressor at 130psi usually has a hard time keeping up with 15psi of intake pressure. also remember it is going through a rather small port in the valve stem and can only push air in so fast.
if i were pressure testing a system to say 30psi for a more extreme build i would have to use plumbing fittings instead of the valve stem to get air in faster. the engine itself also will not totally seal and blowby will vent a bit of pressure off. it is just air after all, it won't kill the oil seals or anything dramatic like that, worst thing to worry about is couplers blowing off and then things will start flying around the room.. use safety glasses.
if i were pressure testing a system to say 30psi for a more extreme build i would have to use plumbing fittings instead of the valve stem to get air in faster. the engine itself also will not totally seal and blowby will vent a bit of pressure off. it is just air after all, it won't kill the oil seals or anything dramatic like that, worst thing to worry about is couplers blowing off and then things will start flying around the room.. use safety glasses.
Last edited by RotaryEvolution; 08-13-12 at 06:33 PM.
08-13-12, 06:39 PM
#42
technically everything is pressurized including the secondaries, as the air can travel across inside the engine to fill the secondary chambers even if the butterflies are blocking the air through the throttle body(at times they may be completely blocked). as well depending on rotor position the air could be pushing right out the exhaust through the seals.
08-13-12, 08:48 PM
#43
ok all the small leaks are taken care of.
I pretty much narrowed down the major leak to the primary injectors. Rotary Evolution I believe you are dead on about the primaries leaking. When I stick my fingers by the injectors I feel the air.. Now im not sure if its exactly the injector gromet area leaking or something around there but you are prob right. THe air leaks is only coming from the passenger side of the injectors BTW. What I dont get is how I never experienced a fuel leak. Under boost fuel should of sprayed all over my engine if the o-rings or gromets are leaking air.
Even when I push down hard on the primaries the noise is still constant. I dont want to remove the UIM yet because I wont be able to use the pressure tester.
I pretty much narrowed down the major leak to the primary injectors. Rotary Evolution I believe you are dead on about the primaries leaking. When I stick my fingers by the injectors I feel the air.. Now im not sure if its exactly the injector gromet area leaking or something around there but you are prob right. THe air leaks is only coming from the passenger side of the injectors BTW. What I dont get is how I never experienced a fuel leak. Under boost fuel should of sprayed all over my engine if the o-rings or gromets are leaking air.
Even when I push down hard on the primaries the noise is still constant. I dont want to remove the UIM yet because I wont be able to use the pressure tester.
08-13-12, 09:15 PM
#44
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There is another picture in the 3rd gen section. It is a different angle to this one. Here you can see the black cap while in the other you can not. When I had my hand under the uim feeling around I was certain the leak was an injector. Luckily it was this instead.
08-13-12, 09:20 PM
#45
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https://www.rx7club.com/3rd-generati...-here-1005168/
In there is the other picture. Depending on the angle the nipple can be difficult to see. Hopefully that will be your issue as well.
In there is the other picture. Depending on the angle the nipple can be difficult to see. Hopefully that will be your issue as well.
08-13-12, 11:53 PM
#49
I did plug the fuel atomization nipple. dont know if it causes any adverse affects since Ive barely driven the car in this setup.
I have really smelled any fuel during or after boost. Even on the dyno. I just smelled it when doing the pressure check.
I have really smelled any fuel during or after boost. Even on the dyno. I just smelled it when doing the pressure check.
