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Old 02-14-2008, 11:29 PM   #1
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So today i way driving my car up what we call Twainharte grade, doing app. 120mph. I have a turbo and an intercooler, but I dont think it leaned out but it may have because i wasn't looking at my air fuel. The car started losing power really bad to the point where i had to stop, in high RPM's it had really really bad oil pressure, so i let it sit for awhile and than it drove fine. What could it be and where should i go to get a better oil pump, or could it be the gauge?
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Old 02-15-2008, 01:28 AM   #2
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sounds like you overheated the engine?
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Old 02-15-2008, 02:01 AM   #3
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a stock motor can take only so much boost for so long...sounds like you were about to "blow the welds off the intake manifold, and then dom and the mad scientist would have had to rip apart the block to replace the piston rings you fired"
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Old 02-15-2008, 10:34 AM   #4
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No he wasn't blowing the welds. His boost was pulling out spark plug wires, draining the a/c, pulling fuses out of the fuse block, and possibly unscrew the steering rack bolts....but boost isn't quite able to blow through welds yet.
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Old 02-15-2008, 10:42 AM   #5
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I had to read your post several times before I could figure out what you were talking about. Commas and periods serve different purposes in a sentence. FYI.

Anyways, you give very little information. When you say "I have a turbo", do you mean you have a GT40 or do you have a T2 from a Sunbird?
What is your intercooler setup?
What boost are you running?
What are you running for fuel and timing?
What are your cooling mods?
Did you smell anything?
What kind of oil are you running and what filter?
DID YOU CHECK THE OIL LEVEL WHEN YOU GOT HOME?
How many miles on the engine?
What kind of compression?
WHAT DID YOUR COOLANT GAUGE LOOK LIKE?

You shouldn't need a "better" oil pump. OEM pumps will last practically forever and provide plenty of oil. Some people have reported failures when building engines that rev much higher than stock. FM sells billet oil pump gears that will rev as high as you need without failing. I've never seen a gauge fail... might be the sender is going bad.

Last edited by samnavy; 02-16-2008 at 01:23 AM.
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Old 02-15-2008, 10:56 AM   #6
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Fuel pump died?
Oil filter is clogged or crap?
Oil turned to sludge in the heat?
We need more info above are 3 possibilities in likely order. More info = better answers from us.
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Old 02-15-2008, 11:30 AM   #7
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so you have a turbo and IC but it didnt lean out? if you has turbo and IC it has to lean out
more info on set up and how long you had it
is it possible that you has squirrel nesting in your turboz?
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Old 02-15-2008, 12:43 PM   #8
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oil cavitation?
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Old 02-15-2008, 12:50 PM   #9
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spark being blown out?
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Old 02-16-2008, 02:25 AM   #10
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Quote:
Originally Posted by Braineack View Post


No he wasn't blowing the welds. His boost was pulling out spark plug wires, draining the a/c, pulling fuses out of the fuse block, and possibly unscrew the steering rack bolts....but boost isn't quite able to blow through welds yet.
i know that...was just quoting fast and furious lol
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Old 02-16-2008, 11:23 PM   #11
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ok i figured it out bad plugs i try split fires they suck they melted down lol so i changed the oil and filter and went back to ngk plugs runs like a champ but i have a question if i wanted more power should a switch to a 1.8 or built a 1.6 or what about a rotary anyone done it
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Old 02-16-2008, 11:27 PM   #12
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yes but it is expensive stick b6 you can make alot of power with it.
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Old 02-17-2008, 12:22 AM   #13
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Andy, this website is full of great guys willing to go out of their way to help you... but you've gotta prove first that you're willing to help yourself. How about using the search function and reading a little. Asking a question like "how can I make more power" is pretty lame.

A 1.8 swap is a simple task and can be done very cheap for about a 8-10whp gain, but you will need a new manifold and downpipe as the flanges and mounting points do not match.

Upgrading parts on your 1.6 motor to handle more boost is gonna run you about $2500 for quality stuff that should stand up to 20psi for a long time.

Rotary swaps have been done for a LOT OF MONEY.

You can find all this information if you'll just search.

Now, what happened to this thread: https://www.miataturbo.net/forum/showthread.php?t=15804
When we last left off, your turbo was smoking. You left us hanging there man, what happened?

Your current setup as you say is this: "a large innercooler, oversized injecters, after market VAF that was tuned to richen up the computer, manual boost control, and a 2.5" exhaust pipe with high flow cat dual exhaust."
It would appear to be an intercooled Greddy kit. With the right bandaids, the Greddy turbo is quite capable of well over 200whp... upwards of 230-250whp. You're not gonna get more without a new engine computer.

But with an IC, and bigger injectors, you have the potential to make about 160-170whp at around 8psi. I assume your A/F gauge is wideband... if it's not, and it's narrowband, it's useless. What your continuing problems might be related to is overheating due to a lean condition caused by running too much boost and not enough fuel. If you don't have a High Pressure fuel pump, there's no way you should be running 10psi. Are you using anything to control timing? A Bipes ACU, a fuel pump, and some 305-330cc injectors would let you run upwards of perhaps 15psi. I'm also curious as to your "aftermarket VAF" as I'm pretty sure that there isn't such a thing. You might have installed a MAF from an RX7 that is larger than the Miata one for a few more ponies.

There's a lot more room to grow with your current setup... but I don't really think YOU even know exactly what your current setup is. How about turning down the boost a little for the timebeing so you don't melt a piston.

And I've asked a lot of questions in this thread... please answer them so we can help you.
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Old 02-17-2008, 01:59 AM   #14
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ok i will start off with sorry for never finishing my out one check it out to see how it turned out
the problem with this car is nothing was done right by the prevous owner so its been hit and miss. i have it at 8 psi right now and it seems happy last night i ran side by side with a ported 93 rx7 witch made erevyones mouth drop cause after that i got pulled on by a wrx with like 20psi and other stuff done so now my car is starting to get respect from all my friends with alot of money sunk in there cars. back to the subject i wish i had a wide band but stuck with a narrow band. your right about the rx7 vaf cause i have never seen a aftermarket one. no on the timing control whats good i really want a f%$king mega squirt but cant afford it right now unless some one has one that they are looking to get ride of for very little but i would have found it in the other sec where people sell stuff or ebay. anyother questions i would be happy to answer as best i can. on monday i am going to try contact fm cause thats who put the car together, the first time. then after that some guy that dosent speak english worked on it then the next owner just did erevything wrong and beat the car down. now i have it and i am figuring stuff out thanks to this form you guys are great
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Old 02-17-2008, 11:52 AM   #15
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Andy, start by telling us every single mod on the car. WE CAN HELP... but we've gotta know exactly what you're working with. It would greatly surprise me if FM had anything to do with that car... it just doesn't sound like something they'd have initially put together. Even if they did and have a record of what they did to it, sounds like other owners have done things... FM's input won't apply.

First, take some GOOD pictures so we can see things. I'm still not 100% sure you've got a Greddy manifold and turbo.

Things we absolutely need to know:
What turbo? (assume Greddy)
What DP? (assume Greddy)
What intercooler? (assume Jimz)
What fuel pump? (assume stock)
What injectors? (assume 1.8 tan-tops)
What MAF? (assume RX7)
What AFPR? (assume Vortech)
What for timing? (assume base set to 6*)
What for BOV?

If everything above is correct and complete... then you MIGHT be all right at 8psi... but that's your upper limit if your boost gauge is indeed accurate. NO MORE BOOST!!! The stock fuel pump is only capable of 80psi if it's still in good shape. The 1.8 tan-top injectors are a good upgrade, but inconjunction with the stock fuel pump will only take you so far. The Vortech FMU is a tried-and-true piece, but who knows what ratio disc you've got in there... gotta know it!
If it's an RX7 MAF, the only real adjustment that can be made is the spring pressure for the flapper door... that helps idle a little, but doesn't really effect anything about driving.

Next step is to verify your timing... you've gotta know what the base timing is or find out if there's a timing control device installed. Have you opened up the passenger footwell and checked out the stock ECU to see if there is maybe something spliced into the wiring harness controlling timing? First things first, CHECK YOU TIMING!!! With an IC, you can set base timing to 7*, but no more than that cause we're still not sure about your fueling.

Even if we fix everything above, it still only gives us a "good feeling" that everything will be OK as far as A/F. You really need a wideband, or a fuel pressure gauge, or a couple dyno pulls to see where you're at. The fact that you've had smoking turbo and melting spark plug problems tells me there's something wrong. I'm surprised you're not saying anything about knocking. Test: next time you go driving, watch the OIL PRESSURE GAUGE as you make a run through the gears. If it ratchets or jumps around or shakes, you're probably knocking. I hope you're using 93octane or whatever the best you've got access to is.

My honest feeling is that you're running lean and it's only a matter of time before you do serious damage to your engine. You need more fuel or you need to turn the boost down a little.
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Old 02-17-2008, 03:49 PM   #16
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Quote:
Originally Posted by andygoesfast View Post
ok i will start off with sorry for never finishing my out one check it out to see how it turned out
the problem with this car is nothing was done right by the prevous owner so its been hit and miss. i have it at 8 psi right now and it seems happy last night i ran side by side with a ported 93 rx7 witch made erevyones mouth drop cause after that i got pulled on by a wrx with like 20psi and other stuff done so now my car is starting to get respect from all my friends with alot of money sunk in there cars. back to the subject i wish i had a wide band but stuck with a narrow band. your right about the rx7 vaf cause i have never seen a aftermarket one. no on the timing control whats good i really want a f%$king mega squirt but cant afford it right now unless some one has one that they are looking to get ride of for very little but i would have found it in the other sec where people sell stuff or ebay. anyother questions i would be happy to answer as best i can. on monday i am going to try contact fm cause thats who put the car together, the first time. then after that some guy that dosent speak english worked on it then the next owner just did erevything wrong and beat the car down. now i have it and i am figuring stuff out thanks to this form you guys are great
Do they not teach english in schools anymore? WTF, learn how to spell and use punctuation.

It hurts to read your posts.
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Old 02-24-2008, 11:34 PM   #17
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Things we absolutely need to know:
What turbo? still not sure i dont kave the car right now so no pics sorry
What DP? i tryed to read to figure out what dp is but came up dry sorry
What intercooler? not sure i can take pics if it will help
What fuel pump? stock with a new after market in line that is rated up to 110psi
What injectors? they are teal tops i think they are 265?
What MAF? rx7
What AFPR? Vortech but not sure of the disc
What for timing?base set to 6*
What for BOV? gready adjustable vented to atmosphere (it messes with the idle i little but its fine for now)
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Old 02-24-2008, 11:56 PM   #18
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Based on your current fuel setup, and only running 8psi intercooled with a base timing of 6*, you shouldn't be having big heat problems. Is your cooling system up to par? What are you running for coolant? Where is your air filter located?

I'd actually think you'd be fine up to around 10psi with those injectors if you could get 100psi in the fuel rail.

What spark plugs are you running?

We need pics.

You need wideband or a dyno.
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Old 02-25-2008, 12:16 AM   #19
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i need a wb and a dyno lol !!!
i have ngks v powers
i think it was just the plugs were **** cause the car ran fine before them and after i took them out and its fine again
i just put the new fuel pump in that made a difference
my air filter is up front its not getting hot air if thats what your asking
and what is dp?
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Old 02-25-2008, 12:48 AM   #20
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you don't know what a down pipe is? Seriusly????























Ok newb a DP is the pipe that connects the turbo to the rest of the exhaust system
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