Power limits by part
10-24-2014, 07:56 PM
#21
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Bryan has broke half shafts at 350? Launching the car at the strip. Maybe someone can go back through his build and confirm.
Bryan has also broke his PPF north of 400.
Bryan also broke his diff carrier (one of the ears i do believe) north of 400. (he does have 3.363 gearing which may be something to think of.
Perhaps someone should cruise back through his build thread and confirm some of this stuff. I can link him to this thread too, he may have some decent input. These are some of the lower end numbers of the parts as he drives his car pretty dang hard.
This is just my opinion, but a reroute should be required if you decide to do any type of forced induction and or track driving at all. Hell. I think it should be required even if you're in a hot climate.
Bryan has also broke his PPF north of 400.
Bryan also broke his diff carrier (one of the ears i do believe) north of 400. (he does have 3.363 gearing which may be something to think of.
Perhaps someone should cruise back through his build thread and confirm some of this stuff. I can link him to this thread too, he may have some decent input. These are some of the lower end numbers of the parts as he drives his car pretty dang hard.
This is just my opinion, but a reroute should be required if you decide to do any type of forced induction and or track driving at all. Hell. I think it should be required even if you're in a hot climate.
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10-26-2014, 05:29 PM
#23
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Thank you, i found that thread. Some good numbers. I couldn't see if MSM axles were being used, but i'd assume so. They are in the table now. Also took the easy way out on the oil/coolant.
I have also found a few good posts from savington RE revs, so theres a few entries in there for that now.
Ive added a thing for fuel pressure on the injectors, thats a good thing to think about.
Fuel pump: Fuel Pump - Miata Turbo FAQ
Anyone know how much pressure the stock injectors will take? I can work out the rest.
Also, PPF, and the upper limits of the half shafts (and now head gasket) are still AWOL. Also pistons.
I lied, more tweaks:
I have also found a few good posts from savington RE revs, so theres a few entries in there for that now.
Originally Posted by guttedmiata
Was making 205hp with 1.8 injectors when we had the 1.6 still in the car. Also can't believe stock fuel pump will support 275hp.
Fuel pump: Fuel Pump - Miata Turbo FAQ
Anyone know how much pressure the stock injectors will take? I can work out the rest.
Also, PPF, and the upper limits of the half shafts (and now head gasket) are still AWOL. Also pistons.
I lied, more tweaks:
Code:
Part Lower limit Upper limit Unit (@wheel, unless rpm) 6” (<1994) diff 80 250 ft/lbs 1.6 clutch 150 160 ft/lbs 1.6 injectors 140/3 ? / ? hp / bar delta 1.8 injectors 170/3 ? / ? hp / bar delta 1.8 clutch 180 190 ft/lbs Ignition coils 225 250 hp 1.6/1.8 Conrods 225/7400 250/7600 ft/lbs / rpm 5 speed gbox 225 275 ft/lbs Cylinder head bolts Unknown, Above 250 ft/lbs Crank pulley/HB 250/7600 300/7800 hp / rpm Fuel pump 270/5.5 300/3 hp / bar Oil pump 280/7400 320/7600 hp / rpm 6 speed gbox 300 375 ft/lbs 7” (1994>) diff 350 400 ft/lbs Propshaft Likely stronger than 7" diff Crank/Block Unknown, above 500 ft/lbs Main bearing caps Unknown, above 500 ft/lbs Throttle shaft 7200 7500 rpm Intake cam VVT 7400 7500 rpm Notable mention to ECU's, coolant reroute, oil cooling Unknowns: Pistons (1.6?/1.8?) 250 300 ft/lbs Half shafts 300 ??? lbs.ft MSM Half shafts 350 ??? lbs.ft PPF ??? ??? lbs.ft Head gasket ??? ??? lbs.ft
Last edited by sparkybean; 10-27-2014 at 04:35 PM.
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10-26-2014, 07:06 PM
#24
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Miata2fast broke several halfshafts/cv shafts while naturally aspirated and running at the drag strip. 1.8 car using '99 head, cams, 12:1 pistons, carburetors, so 150hp?
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11-04-2014, 05:22 PM
#26
I'd say it's probably well above 200 psi. Maybe even well above 500 psi. Definitely greater than most fuel hoses, fuel pressure regulators, or fuel pumps.
Wait...This is the "power limits" thread. Certainly you didn't mean to insinuate that the fuel rail had a power limit, did you?
Wait...This is the "power limits" thread. Certainly you didn't mean to insinuate that the fuel rail had a power limit, did you?
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11-05-2014, 08:45 AM
#27
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Yes, I did mean power limit. Surely the fuel rail has point where it can no longer provide a high enough volume of fuel for even distribution to each cylinder. If the flow limit was so high that we couldn't find it, there would be no reason for aftermarket fuel rails to exist.
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11-05-2014, 08:51 AM
#28
Yes, I did mean power limit. Surely the fuel rail has point where it can no longer provide a high enough volume of fuel for even distribution to each cylinder. If the flow limit was so high that we couldn't find it, there would be no reason for aftermarket fuel rails to exist.
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11-05-2014, 09:29 AM
#29
Most of them exist because people will gobble up any silly statement a company makes and companies make money that way. Most here have not found the limit of the stock rail, but if I had to guess I'd say it's somewhere between 450-550 or so
...I think it was hilarious that for years everyone was raving about dual feed rails, and many even made their own DIY dual feed rails. Then we go and prove that neither cyl 1 nor cyl 4 is starved for fuel, and now only a handful of people here run them, most of them "just because".
Also the nb2 is not making 130 at the wheels bone stock unless maybe its an msm
...I think it was hilarious that for years everyone was raving about dual feed rails, and many even made their own DIY dual feed rails. Then we go and prove that neither cyl 1 nor cyl 4 is starved for fuel, and now only a handful of people here run them, most of them "just because".
Also the nb2 is not making 130 at the wheels bone stock unless maybe its an msm
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11-05-2014, 09:52 AM
#30
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I think most people switch rails for easy use of an aftermarket FPR and easy clean AN connections. I know that's why i'm putting a dual feed rail on. More so than "just because".
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11-05-2014, 10:21 AM
#32
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right... market a paper bag full of **** properly and someone will buy it. I get that.
I am simply trying to figure out if i will need more than a new fuel pump in my 2000 with 600cc/min injectors to be able to evenly fuel 300hp on 93 octane. The returnless miatas have a better stock FPR than the NA's FPR, so i am less concerned about the FPR being able to manage the larger pump. I cant find any info on where this FPR and fuel rail become an issue.
I am also having a little difficulty in finding a clean way to reduce the pressure differential between the manifold pressure and fuel pressure since the returnless FPR is at the tank. I am thinking i will have to route a manifold pressure signal line all the way back to the tank to get something like the FUELAB 545 to work easily for me.
I am simply trying to figure out if i will need more than a new fuel pump in my 2000 with 600cc/min injectors to be able to evenly fuel 300hp on 93 octane. The returnless miatas have a better stock FPR than the NA's FPR, so i am less concerned about the FPR being able to manage the larger pump. I cant find any info on where this FPR and fuel rail become an issue.
I am also having a little difficulty in finding a clean way to reduce the pressure differential between the manifold pressure and fuel pressure since the returnless FPR is at the tank. I am thinking i will have to route a manifold pressure signal line all the way back to the tank to get something like the FUELAB 545 to work easily for me.
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11-05-2014, 10:28 AM
#34
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sorry for the slight threadjack... Thank you for the answers on the fuel rail. I speculated that its limits were rather high but didnt have any info to be able to back it up.
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11-07-2014, 05:31 PM
#36
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Im keeping this to sub-400 levels, partly to stop the list growing to cover every part number of the car but mostly because if you are at that power level, you know what you are doing.
Both the bosch and delphi injectors seem to top out at 8 bar delta, which puts their max power potential at 230/280hp
(RC Fuel Injection)
Sixshooter, im convinced miata2fast's car would have been wheel hopping. 150hp seems ridiculous.
Still learning...
Both the bosch and delphi injectors seem to top out at 8 bar delta, which puts their max power potential at 230/280hp
(RC Fuel Injection)Sixshooter, im convinced miata2fast's car would have been wheel hopping. 150hp seems ridiculous.
Still learning...
Code:
Part Lower limit Upper limit Unit (@wheel, unless rpm) 6” (<1994) diff 80 250 ft/lbs 1.6 clutch 150 160 ft/lbs 1.6 injectors 140/3 230 / 8 hp / bar delta 1.8 injectors 170/3 280 / 8 hp / bar delta 1.8 clutch 180 190 ft/lbs Ignition coils 225 250 hp 1.6/1.8 Conrods 225/7400 250/7600 ft/lbs / rpm 5 speed gbox 225 275 ft/lbs Cylinder head bolts Unknown, Above 250 ft/lbs Fuel pump 270/5.5 300/3 hp / bar Pistons (1.8) 275 350 hp Oil pump 280/7400 350/7600 hp / rpm Crank pulley/HB 300/7600 400/7800 hp / rpm 6 speed gbox 300 400 ft/lbs 7” (1994>) diff 375 450 ft/lbs Throttle shaft 7200 7500 rpm Intake cam VVT 7400 7500 rpm Notable mention to ECU's, coolant reroute, oil cooling Pistons (1.6) ? - ? lbs.ft Half shafts 300 - ? lbs.ft MSM Half shafts 350 - ? lbs.ft PPF ? ? lbs.ft Head gasket ? - ? lbs.ft MSM 6 speed gbox ? - ? lbs.ft
Last edited by sparkybean; 11-07-2014 at 05:45 PM.
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