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How much boost?

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Started by Karim, Sep 30 2014 01:13 AM

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9 replies to this topic

#1
Karim
Posted 30 September 2014 - 01:13 AM

Karim

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Evo 1 with engine freshly rebuilt:

6-bolt block redone
7-bolt head rebuilt (new valve guides and lifters)
Mahle forged pistons (85.5mm)
Scat rods
ARP studs
OEM head gasket
ACL Race bearings
Polished crankshaft

In your opinion, how much boost can it handle before blowing up.

Staying with stock turbo but upgrading injectors, fuel pump, exhaust and computer to run it, how far can a setup like this go in terms of boost? horsepower?

Let's discuss.


#2
Geo&Kez
Posted 30 September 2014 - 06:31 AM

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Likely octane?

Comp ratio?

Injector size?

You want it to blow up in a week, a month, next year.......?

 

Lots of variables mate. Would be much easier to pick a target output and then build to that. Look for the weakest link and limit to that, OEM H/G would seem to be it in your build so something like 17psi might be manageable for a while.


I HATE BEING BIPOLAR........IT'S AWESOME!!

#3
SKMsport
Posted 30 September 2014 - 06:58 AM

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My engine sounds fairly similar to yours except I'm running an HKS head gasket.

 

I am running around 22PSI. But will be upping to 25PSI, and the engine will have no problem with that.

 

It was running around 30 PSI on the dyno but the injectors were the weak point.

 

But I guess you don't really want to find out as that means an expensive rebuild.


#4
jack be nimble
Posted 30 September 2014 - 09:33 AM

jack be nimble

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Stateside guys run heaps of boost and boost surge to 35psi or so....
So that might be 500 crank hp?

There is a formula to work out hp from increasing boost

Edited by jack of all, 30 September 2014 - 10:03 AM.

4g93t jumbuck conversion. PRANGED 18/3/12, CHECK MY MEMBER RIDES Page 11. no serious human injuries.
ON THE ENGINE STAND. g4cs 2.4l + Gt35r. PLUS: auto conversion + Awd coming.
thanks for parts and help: BMGTZ, EVOCPE, cwolf, Benozi, Jamo-GSR, 1JUM2NV, RXVII..much appreciated, cheers guys.
Aerodynamics are for people who can't build engines. —Enzo Ferrari
REMEMBER: you cant polish a turd, but you can roll it in glitter.

#5
Dean_Vr4
Posted 30 September 2014 - 10:51 AM

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Put egts in and boost it😉

1991 aspec Vr4 - RS Vr4 4g63 - td05 16g - 510 injectors- haltech ps1000 pnp - walbro 400 pump - custom exhaust manifold - hotbits coilovers - alot to come :P

#6
BMGTZ
Posted 30 September 2014 - 12:07 PM

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keep turning the boost up till it blows.   build another one and run 2 lb less boost


BRIAN
Black evo 1 full road rego and done properly/legally

I have heaps of parts...but never the one I need.

 

 

#7
jack be nimble
Posted 30 September 2014 - 12:39 PM

jack be nimble

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At least its not the skyline turbos that screw the wheels off
4g93t jumbuck conversion. PRANGED 18/3/12, CHECK MY MEMBER RIDES Page 11. no serious human injuries.
ON THE ENGINE STAND. g4cs 2.4l + Gt35r. PLUS: auto conversion + Awd coming.
thanks for parts and help: BMGTZ, EVOCPE, cwolf, Benozi, Jamo-GSR, 1JUM2NV, RXVII..much appreciated, cheers guys.
Aerodynamics are for people who can't build engines. —Enzo Ferrari
REMEMBER: you cant polish a turd, but you can roll it in glitter.

#8
Karim
Posted 30 September 2014 - 01:30 PM

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Thanks for the input guys.

 

Just wanted to have an idea of the safety margin.

 

Not looking for power but more reliability. Car is extensively tracked on road courses.

 

In your opinion, is 300whp achievable with relative reliability?


#9
jack be nimble
Posted 30 September 2014 - 03:33 PM

jack be nimble

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Maybe.
A few guys on here:
http://www.dsmtalk.c...t=202681&page=3
4g93t jumbuck conversion. PRANGED 18/3/12, CHECK MY MEMBER RIDES Page 11. no serious human injuries.
ON THE ENGINE STAND. g4cs 2.4l + Gt35r. PLUS: auto conversion + Awd coming.
thanks for parts and help: BMGTZ, EVOCPE, cwolf, Benozi, Jamo-GSR, 1JUM2NV, RXVII..much appreciated, cheers guys.
Aerodynamics are for people who can't build engines. —Enzo Ferrari
REMEMBER: you cant polish a turd, but you can roll it in glitter.

#10
Karim
Posted 30 September 2014 - 10:23 PM

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Thanks, will look at that.


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