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Old 09-11-2014, 12:54 PM   #1
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Default Forged pistons & turbo lag reduction

I have a 1997 miata 1.8L & I plan to get a Garrett GT2860 from BEGI, I plan to run it at it's full potential (12psi) but talking to a specialist he mentioned that the turbo is a bit too big so there would be some turbo lag & I was thinking of purchasing CP forged pistons 84mm 9:1 compression set, I already bought a lightweight flywheel & lightweight crank pulley, what do you guys think? Is CP forged pistons a good brand? (Btw this is gonna be my daily car I plan to race it at least 20% of the time) Is increasing the bore size gonna help? Any other ways to reduce turbo lag?
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Old 09-11-2014, 01:03 PM   #2
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I think you have no idea what you're doing.


but I'll be nice and help you anyway:
to reduce turbo lag you want to run a properly sized turbo and have the least amount of restriction in the exhaust and charge air path. Properly sized turbo is the smallest turbo that will reach your hp and tq goals, and least restriction means good hotside parts and good charge side path, intercooler flow, and IM flow.

Before you make n00b mistakes with a build/setup, I suggest doing way more research.

PS: sure, overboring and running bigger pistons will get you to 1.9L, and will help, but not nearly as much as what I mentioned above.
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Old 09-11-2014, 01:05 PM   #3
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It's all in your plans and how much power you want. You mentioned a GT2860 at 12psi, which should be around 250whp. If that's your power goal, you'd be better off with a GT2560 that's easily capable of that power and will spool a good bit faster.

If you want to push the power a little higher, toward 300whp, then the GT2860 or GT2871 and a built motor is probably a better option.
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Old 09-11-2014, 01:10 PM   #4
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Quote:
Originally Posted by CHAKISIMO View Post
lightweight crank pulley
Also, these are death to miatas. Make sure you research real well before you put it on and destroy your oil pump.
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Old 09-11-2014, 01:20 PM   #5
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Man, you guys are getting soft in your old age! Giving good advice, with no insults?

OP, you hit the jackpot of people in a good mood for some reason... take their advice as a gift from the gods!

Keith
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Old 09-11-2014, 01:28 PM   #6
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Quote:
Originally Posted by CHAKISIMO View Post
I have a 1997 miata 1.8L & I plan to get a
Garrett GT2860 from BEGI, I plan to run it at it's full potential (12psi)
It'll do more than that on a BP, sir.

Quote:
but talking to a specialist he mentioned that the turbo is a bit too big
Too big for... what? Turbo is fine.

Quote:
so there would be some turbo lag
Not much.

Quote:
& I was thinking of purchasing CP forged pistons 84mm 9:1 compression set,
Replace with Supertech 8.6:1 for pump gas goodness.

Quote:
I already bought a lightweight flywheel
Good!

Quote:
& lightweight crank pulley, what do you guys think?
Bad.


Quote:
Is CP forged pistons a good brand?
Yes. Buy Supertechs anyways.

Quote:
(Btw this is gonna be my daily car I plan to race it at least 20% of the time) Is increasing the bore size gonna help?
Not really.

Quote:
Any other ways to reduce turbo lag?
Good tune. Good hot side. Efficient intercooler setup. Picking the correct turbo for your goals/needs, etc etc etc
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Old 09-11-2014, 04:58 PM   #7
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lol @ "full potential" of a 2860 being 12 psi.

You sir need a 2554 or 2560.
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Old 09-11-2014, 04:59 PM   #8
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Quote:
Originally Posted by turbofan View Post
lol @ "full potential" of a 2860 being 12 psi.

You sir need a 2554 or 2560.


I'd say those are both too big to be limited at 12psi on a BP.
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Old 09-11-2014, 05:05 PM   #9
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Old 09-11-2014, 05:12 PM   #10
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Somewhere, Corky and StealthNB are jizzing over that wastegate reference port.
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Old 09-11-2014, 05:15 PM   #11
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Quote:
Originally Posted by concealer404 View Post
Somewhere, Corky and StealthNB are jizzing over that wastegate reference port.


Quote:
Originally Posted by turbofan View Post
lol @ "full potential" of a 2860 being 12 psi.

You sir need a 2554 or 2560.
yes yes and yes to concealer's answer, much props

Last edited by Girz0r; 09-11-2014 at 05:25 PM.
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Old 09-11-2014, 05:29 PM   #12
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Eh the turbo on my Fiesta isn't much bigger than that and it hits 21psi. 1.0L FTW
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Old 09-11-2014, 05:52 PM   #13
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waitwaitwait... the stock 1.0 ecoboost 3 cyl is at 21 psi?

That's idiotic. lol
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Old 09-11-2014, 06:10 PM   #14
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Yup I think it is limited to 18 or so in 1st through 3rd gears and 21 in 4th and 5th.

Just waiting for the warranty to run out so I can strap on a GT2554 and swap it into a Miata!
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Old 09-11-2014, 06:10 PM   #15
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Quote:
Originally Posted by thenuge26 View Post
Eh the turbo on my Fiesta isn't much bigger than that and it hits 21psi. 1.0L FTW
I second Ed. What are you talking about? Proof plz.

This thread is now about 21 psi tiny turbos, not a noob that is going "ALLOFIT" 12 psi 2860.
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Old 09-11-2014, 06:11 PM   #16
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Did the OP ever state his peak power goals? Without that we can't give a real answer on turbo sizing.

Or, he could mention his high load [4th and 5th gear] boost threshold RPM requests, and then from there end up with whatever power at the top end.
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Old 09-11-2014, 06:12 PM   #17
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Quote:
Originally Posted by Chilicharger665 View Post
I second Ed. What are you talking about? Proof plz.

This thread is now about 21 psi tiny turbos, not a noob that is going "ALLOFIT" 12 psi 2860.


The new 1.0 Ecoboost motor that's an option in the Fiesta. Runs lots 'o' boosto.

New cars run lots of boost. I think even the new Elantra Turbo is knocking on the door to 20psi.
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Old 09-11-2014, 06:23 PM   #18
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http://www.nytimes.com/2014/08/03/au...view.html?_r=0

20psi, sorry, it appears I was incorrect.

Quote:
But the Fiesta, like the Porsche 911 Turbo, can also allow a temporary overboost, raising maximum boost to 20 p.s.i. and generating 148 pound-feet of torque for as long as 15 seconds.
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Old 09-11-2014, 07:10 PM   #19
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Quote:
Originally Posted by turbofan View Post
I need this for my leaf blower
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Old 09-11-2014, 07:28 PM   #20
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Here's the Fiesta turbo with a quarter on the compressor for comparison:

Attached Thumbnails
Forged pistons & turbo lag reduction-s6l2ylh.jpg  
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