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-   DIY Turbo Discussion (https://www.miataturbo.net/diy-turbo-discussion-14/)
-   -   is 18 or 20psi safe?? (https://www.miataturbo.net/diy-turbo-discussion-14/18-20psi-safe-9639/)

jasono718 05-08-2007 02:36 PM

is 18 or 20psi safe??
 
i just dropped my car off at rpm to have them tune my link and install 550s and i told them to set it up for 18psi... is that safe?? they are the best tuning shop on the east coast so they should be able to make it perfect...
i am running 305s at 15psi right now and its not fast enough.. i hope that 18psi with a good tune and my big 16g back on will make more power...
thx

Braineack 05-08-2007 02:38 PM

i wouldn't push more than that...

however, I'm questioning how safe it was to run 305s past 170rwhp at 50psi of fuel...was an FMU invovled?

jasono718 05-08-2007 02:53 PM

yeah.. its not safe... lots of detonation.. just rebuilt the motor... didnt take it to 15psi that much, maybe two or three times... i hope that 18psi is enough... i think that it should be fine with the forged rods, wiesco pistons, cometic head gasket and apr main studs i just put in...
thx

jasono718 05-08-2007 02:54 PM

vortec fmu

Braineack 05-08-2007 02:57 PM

oh....then that's nothing.

jayc72 05-08-2007 02:58 PM

The built bottom end should make it safe. What kind of boost was Andy running with out any engine managment?

jwarriner 05-08-2007 02:59 PM

All the Mitsu 'G' wheels really shine beyond 20psi.

Lex 05-08-2007 03:06 PM

with a built bottom end it should be good for 25psi + and past that the motor will start having flow issues and more work has to go in

m2cupcar 05-08-2007 03:40 PM

18psi was Afloyd's high power run. Keep in mind if you're having it tuned to from a "coarse" tune, you should get more power for your boost level anyway.

magnamx-5 05-08-2007 05:09 PM

for real jason. how many hp are you looking to make 330 or so?

jasono718 05-08-2007 05:33 PM

that sounds pretty good to me....

xcsx 05-08-2007 05:42 PM

I run the GReddy at 18psi all day long with no detonation. I have 440cc injectors tuned with the Link.

Granted, I do have a built motor but I have had no issues with my setup so far.

Lex 05-08-2007 05:48 PM


Originally Posted by xcsx (Post 110763)
I run the GReddy at 18psi all day long with no detonation. I have 440cc injectors tuned with the Link.

Granted, I do have a built motor but I have had no issues with my setup so far.

That turbo is good enough for 18psi to redline?

jasono718 05-08-2007 05:48 PM

how much power are you making???

xcsx 05-08-2007 05:56 PM


Originally Posted by Lex (Post 110767)
That turbo is good enough for 18psi to redline?

Yep. I've never had a problem with it. I can bounce it off the rev limiter and the boost gauge holds 18psi for as long as I want it to (but of course I don't)


Originally Posted by jasono718 (Post 110767)
how much power are you making???

I wish I knew. I haven't had a chance to dyno yet. It'll be this season, I'd like to know myself.

Braineack 05-08-2007 06:02 PM

Probably something in the 275rwhp range...about the most you can ask from it.

xcsx 05-08-2007 06:11 PM

That's what I was thinking. I really wouldn't want more than that in all honesty. The car is pretty undriveable in hard rain, despite my compromising choices for street tires.

It's also a pig on gas and tires. ~12mpg on 93 octane and I had the belts coming through a set of RT615s in ~1300 miles. :sadwavey:

I still love it though. :)

jasono718 05-08-2007 09:08 PM

you get less than 12mpg with the link ???
is that just under boost or all the time???
thx

Braineack 05-08-2007 09:18 PM

I assume his driving habits are to blame ;) I was still making 27mpg at 200rwhp, i expect the same at 250.

turbopezz 05-08-2007 09:29 PM

i have a link,run 93 octane and get a whoping 12-15mpg.


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