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Old 05-19-2008, 10:00 PM   #21
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oh yea for injectors just grab some 1.8 miata injectors, there pnp and there good for 9psi and there not pricey.

Since you have a 190 pump are you still using the vortec.
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Old 05-19-2008, 11:17 PM   #22
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I have an intercooler at 5psi. Just did so i can advance timing a little bit. Since you have some money, do the oil cooler (fo sho), intercooler, godspeed radiator (or koyo), and If you got more money then move on down to water injection.

Im scared to track race (we don't have a track here anyways), i just cant see my self boosting for longer then like 5 minutes.
Are stock radiators not sufficient even if cleaned and filled with water wetter and a 75/25 mix of water and antifreeze?
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Old 05-19-2008, 11:18 PM   #23
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oh yea for injectors just grab some 1.8 miata injectors, there pnp and there good for 9psi and there not pricey.

Since you have a 190 pump are you still using the vortec.
I don't need any other mods to run 1.8 injectors? Will they cause it to run rich or more difficult to drive around town?

The car does still have the vortec, is this not compatible with the 190?
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Old 05-19-2008, 11:27 PM   #24
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I don't need any other mods to run 1.8 injectors? Will they cause it to run rich or more difficult to drive around town?

The car does still have the vortec, is this not compatible with the 190?

The 1.8 are just pnp and thats it.

The 1.6 stock injectors are rated like 235cc or something like that. The 1.8 injectors are 265cc. I was running 305cc with the Vortec and stock fuel pump and it idled fine, but since i dont have software to run my EMB i took them out and put back the stock ones. When i get my EMB up and running i will be tuning the car with the 305cc.
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Old 05-19-2008, 11:31 PM   #25
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you'll be fine on the track. I ran mine at 5psi just fine. put some good quality zipties around the accordian part of the stock crossover pipe to help it from expanding too much. put 100% water in (don't forget to replace when you're done) and possibly put in a gutted thermostat (again, don't forget to replace) and make sure you run both fans all the time, one of yours is only coming on with the a/c. do a search to figure out how. there are three things you can do for almost free.

I did see some high coolant temps and oil temps, which is why I put in an intercooler, and a godspeed radiator. just keep an eye on it.
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Old 05-19-2008, 11:39 PM   #26
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Yes, you need more fuel when you add an IC. The charge air is cooler, which means denser, which means more oxygen molecules per putt in the chamber. More oxygen needs more fuel. Probably in the range of 10 to 15%.
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Old 05-20-2008, 11:05 AM   #27
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Yes, you need more fuel when you add an IC. The charge air is cooler, which means denser, which means more oxygen molecules per putt in the chamber. More oxygen needs more fuel. Probably in the range of 10 to 15%.


You're saying a stock greddy kit with noting added except an intercooler will require an extra 35cc of injector (1.8 tan tops) to run 5psi safely?
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Old 05-20-2008, 01:33 PM   #28
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You're saying a stock greddy kit with noting added except an intercooler will require an extra 35cc of injector (1.8 tan tops) to run 5psi safely?

not necessarily
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Old 05-20-2008, 04:27 PM   #29
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So if you're running 5psi and drop a IC, you'll loose about 1psi. Then you boost it up to get 5 psi again?
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Old 05-20-2008, 07:41 PM   #30
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So if you're running 5psi and drop a IC, you'll loose about 1psi. Then you boost it up to get 5 psi again?

yea there's a little pressure drop through the IC but It makes up for it with the cooler air
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Old 05-21-2008, 02:40 AM   #31
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no need to crank up the volume ****, because the extra power from cooler air is enough?
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Old 05-21-2008, 02:52 AM   #32
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No, you'll be slower even with the cooler air until you crank the boost back up to where it was. How much slower depends on the efficiency and pressure drop of the intercooler setup you use.
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Old 05-21-2008, 04:23 AM   #33
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No, you'll be slower even with the cooler air until you crank the boost back up to where it was. How much slower depends on the efficiency and pressure drop of the intercooler setup you use.
thx bruce that was my doubt.
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Old 05-21-2008, 12:11 PM   #34
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No, you'll be slower even with the cooler air until you crank the boost back up to where it was. How much slower depends on the efficiency and pressure drop of the intercooler setup you use.

It will also depend on where your boost reference for the wastegate was. It is was after the intercooler then you would make the same boost as before.
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Old 05-21-2008, 12:49 PM   #35
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Quote:
Originally Posted by mike_671 View Post
The 1.8 are just pnp and thats it.

The 1.6 stock injectors are rated like 235cc or something like that. The 1.8 injectors are 265cc. I was running 305cc with the Vortec and stock fuel pump and it idled fine, but since i dont have software to run my EMB i took them out and put back the stock ones. When i get my EMB up and running i will be tuning the car with the 305cc.


When I get my betamax player in...
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Old 05-21-2008, 01:49 PM   #36
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not necessarily

That's why I asked the question. My wideband on basically the setup stated earlier shows the stock injectors and fuel pump are perfectly adequate at 5psi.
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