Is my buddy being dumb?
#22
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Long Live Bubb Rubb! Whoo whooo!!
You can run a FPR on a 99 but you have to run a return line. As mentioned real fuel management is a much better, more powerful solution and really does not cost much more. Maybe you can find a good used FPR really cheap.
Keep in mind your buddy is going to be very, very tempted to turn up the boost, and that setup has no overhead (negative overhead) so he could be in for problems.
But, if he HAS to keep it cheap, maybe a good dose of water-meth in boost would limp it through the inevitable lean spots. But even if that would work, just like with the FPR, the money would still be better spent on a MS.
You can run a FPR on a 99 but you have to run a return line. As mentioned real fuel management is a much better, more powerful solution and really does not cost much more. Maybe you can find a good used FPR really cheap.
Keep in mind your buddy is going to be very, very tempted to turn up the boost, and that setup has no overhead (negative overhead) so he could be in for problems.
But, if he HAS to keep it cheap, maybe a good dose of water-meth in boost would limp it through the inevitable lean spots. But even if that would work, just like with the FPR, the money would still be better spent on a MS.
#24
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Where do you people come from? Just here to sell something?
An engine with 0psi can run lean and / or detonate... Thats like saying "Oh, my rotary won't **** the apex seals out the exhaust ports running high boost and water for fuel.."
Take my personal experience, 5psi IS MORE than enough to cause an engine to detonate WITH proper AFR.
An engine with 0psi can run lean and / or detonate... Thats like saying "Oh, my rotary won't **** the apex seals out the exhaust ports running high boost and water for fuel.."
Take my personal experience, 5psi IS MORE than enough to cause an engine to detonate WITH proper AFR.
#26
Sorry, but from my experience 5psi isnt enough to detonate. Ive been around more than a few turbo miatas and never had an issue. They were not my personal cars, friends cars but I of course wouldnt personally advise running boost without some sort of fuel management, but from experience, 5 psi has done anything. And no, I am not here just to sell something.
#27
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Sorry, but from my experience 5psi isnt enough to detonate. Ive been around more than a few turbo miatas and never had an issue. They were not my personal cars, friends cars but I of course wouldnt personally advise running boost without some sort of fuel management, but from experience, 5 psi has done anything. And no, I am not here just to sell something.
Knocking (also called knock, detonation, spark knock or pinging) in spark-ignition internal combustion engines occurs when combustion of the air/fuel mixture in the cylinder starts off correctly in response to ignition by the spark plug, but one or more pockets of air/fuel mixture explode outside the envelope of the normal combustion front. The fuel-air charge is meant to be ignited by the spark plug only, and at a precise time in the piston's stroke cycle. The peak of the combustion process no longer occurs at the optimum moment for the four-stroke cycle. The shock wave creates the characteristic metallic "pinging" sound, and cylinder pressure increases dramatically. Effects of engine knocking range from inconsequential to completely destructive. It should not be confused with pre-ignition (or preignition), as they are two separate events.
Thats MY piston, from an engine I built for an old pickup. 11:1 compression, big *** roller cam, heavily modified head, good intake and exhaust system, took a motor with a factory 5500rpm redline and spun it to 7000 on a regular basis. Notice I say nothing about boost? See something wrong with it? How about the crack from the face to the skirt? Maybe the large portion of material missing from the ring land at the top ring? Notice the piece of piston ring impaled into the face of the piston?
The engine that piston came out was very well tuned and ran like a top. One screamin' *** truck, until I got some bad gas. Guess what? Detonation under hard acceleration, without the presence of boost. Fucked up the block, a piston, and the cylinder head. What happened? It probably went lean and had too much spark advance.
I also share experience from another board member who had a supercharger installed on his vehicle for a while, which is now installed on mine. With supporting bandaids, 10:1 AFR, and 5psi guess what happened? It killed his motor. How? Detonation.
Here, I'll link you to a thread I started on here a couple years ago, asking about why his oil pressure gauge would freak out on the highway. It did it from day one of installing the supercharger with the 5psi pulley, and even worse with an 8psi pulley.
https://www.miataturbo.net/forum/t16318/
Not here just to sell stuff, yet you have 25 posts on this board and already posted up a for sale thread?
#28
Sorry, but from my experience 5psi isnt enough to detonate. Ive been around more than a few turbo miatas and never had an issue. They were not my personal cars, friends cars but I of course wouldnt personally advise running boost without some sort of fuel management, but from experience, 5 psi has done anything. And no, I am not here just to sell something.
Here's what i see happening, your friends car will run like **** for about a week, then start smoking really badly, then the motor will die completely, then he'll register to this forum where he will then receive a severe lashing for asking a dumb question while not using the search tab, at this point 18psi or Hustler (one of the two) will then make fun of your friend so badly, that he will likely cry for a week straight, at which point he will decide to part his car out on our parts for sale section, and we will reap all the benefits! SO...........do it right.... thanks!
#30
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If he is going to be stubborn and do something stupid, let him do it, then buy his stuff when he parts it. The '99 has a good head so you will want that too if he does not melt it. If he has a 6-speed and/or a torsen jump on those too. He is going to blow the welds on the block so it will be trash
Please report back in later on, let us know what happens.
Please report back in later on, let us know what happens.
#32
Ring lands or rods
Ok, you guys are all having way too much fun with OPs hard headed buddy. So, I'd like some opinions on how this motor is going to let go. Assuming the boost is kept in the 5-8psi range (with no bandaids), will the top ring lands on the stock pistons let go first (at the edges near the intake valve relief) or do we get the big bang with a stock rod exiting the side of the block???
Last edited by sn95; 02-21-2010 at 12:28 PM. Reason: fixed bandaids
#34
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He will be running a lean charge with more energy and initial heat, resulting in hot components, increased detonation risk, and all the risk for the usual resulting damage. Rings, pistons, valves, chambers, and definitely blown welds from the F&F effect.
What do you mean by 1/2 a bandaid? Based on the OPs description his buddy is talking about running no bandaid.
What do you mean by 1/2 a bandaid? Based on the OPs description his buddy is talking about running no bandaid.
#36
He will be running a lean charge with more energy and initial heat, resulting in hot components, increased detonation risk, and all the risk for the usual resulting damage. Rings, pistons, valves, chambers, and definitely blown welds from the F&F effect.
What do you mean by 1/2 a bandaid? Based on the OPs description his buddy is talking about running no bandaid.
What do you mean by 1/2 a bandaid? Based on the OPs description his buddy is talking about running no bandaid.