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Old 10-24-2014, 08:56 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.
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Old 10-24-2014, 10:14 PM   #22
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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.
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Old 10-26-2014, 06:29 PM   #23
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Quote:
Originally Posted by Erat View Post
Bryan has broke...
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.

Quote:
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.
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:

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 05:35 PM.
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Old 10-26-2014, 08:06 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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Old 11-04-2014, 04:36 PM   #25
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Anyone know the limits of the stock fuel rail?
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Old 11-04-2014, 06:22 PM   #26
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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?
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Old 11-05-2014, 09:45 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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Old 11-05-2014, 09:51 AM   #28
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Quote:
Originally Posted by swimming108 View Post
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.
Well marketing. I bought one because I couldnt find an FPR adapter for the stock fuel rail (because I was searching for miata parts and not shitty fwd mazda parts) and the fuel rail from 949 was cheap enough.
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Old 11-05-2014, 10:29 AM   #29
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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
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Old 11-05-2014, 10:52 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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Old 11-05-2014, 10:59 AM   #31
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That makes more sense, and is probably a good reason to run one.

So there's the real reason, OP
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Old 11-05-2014, 11:21 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.
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Old 11-05-2014, 11:27 AM   #33
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Or you could just convert to a return style setup.
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Old 11-05-2014, 11:28 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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Old 11-05-2014, 11:35 AM   #35
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I think you're right around the limit of the stock pump/fpr actually.
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Old 11-07-2014, 06:31 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...

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 06:45 PM.
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