Max PSI

[MatMurF]

Hey all!!! Anyone know wat most psi that can be run through stock 4g63 and that can be safe??? Cheers

 

[ENGINR]

:roll:

 

[Liberoz]

Define what you think is safe ?

Safe to me is is not pinging (= you can feel the knock counts retarding the timing) over boosting will cause ecu to read knock counts and retard the timing to protect the engine.

Stock is around 15psi ish from memory.

One of the quickest ways to ruin a engine is playing with boost levels and not having the ability to read the engine's symptoms of not liking it.. basically it isn't learnt over night.

 

[ENGINR]

what's with the "SOGGY MOCCASSIN" stuff i've seen going on around here?

 

[Liberoz]

what's with the "SOGGY MOCCASSIN" stuff i've seen going on around here?

WTF is that EnginR :lol:

 

[CLuTZ]

When you use the word (unt, that appears.


i.e: "it was a cunt of a job"


Back on topic- it all depends on what supporting mods you have on your car for you to allow to raise the boost safely.....

When you get those sorted, its a good tune the car for maximum power and back it off 15% or there abouts....

It all depends on what setup you are running really

 

[shadow]

And which generation motor it is.

 

[ENGINR]

When you use the word (unt, that appears.


i.e: "it was a SOGGY MOCCASSIN of a job"

Ahhhh! Now I get it. So everybody stop being a SOGGY MOCCASSIN and get back to topic!! hehehehe

 

[mattrat]

dont people run upto 20 psi and above on stock 6 bolt bottom ends? with decent head gasket and hed studs of corse

 

[GSR94T]

my mate was running 18psi day in and day out on std internals (with a good fuel set up) on a 4g63 with td05

 

[CLuTZ]

Yeah i've had 2 cars run 20+ psi all day happily with stock headgaskets and head studs etc.

They both made over 200kw atw too, one trapping 115mph, and the other 111mph

 

[ENGINR]

Guys - what size exhausts and what ECUs were you running? What are the limits of the standard AF meter?

 

[CLuTZ]

Guys - what size exhausts and what ECUs were you running? What are the limits of the standard AF meter?

1st setup: 3" all the way Autronic SM2 with no AFM, 202kw atw, 12.5@109MPH (best 12.03 and 115MPH)

2nd setup: 3" all the way from ported E3 dump, chipped eprom ECU (VR4) and 2G (magna) AFM. 216kw atw, 13.7@111mph (FWD)



I'd say you'd have to be making well over 400HP atw for a 2G AFM to start being a restriction

 

[SIVART]

dont people run upto 20 psi and above on stock 6 bolt bottom ends? with decent head gasket and hed studs of corse

the motor was rebuilt but all standard gear, but a easy 25psi on a 6 bolt no probs

I was running a walbro, sard reg, emanage piggy back, no afm

I havnt boosted my 7 bolt yet but I might go to 15psi only

 

[ENGINR]

OK, what AFR were you getting at max power? Mine's doing 10.2....

Also - I've highflowed my Big16g with a GT Pumps 20G comp wheel, but kept the standard turbine housing.. Is it worth upgrading that to Mark's enlarged housing?

 

[3zercrowd]

OK, what AFR were you getting at max power? Mine's doing 10.2....

Also - I've highflowed my Big16g with a GT Pumps 20G comp wheel, but kept the standard turbine housing.. Is it worth upgrading that to Mark's enlarged housing?

10.2 is TOO rich on full boost.

You will be robbing power.

Try to get a nice setup between 11.3-11.8 to be nice and safe for good power.

 

[ENGINR]

Hmmm. Thanks Dane, I've got a target to work towards now.

 

[MatMurF]

Yea well its running 8 psi at moment and i have on the way dual stage boost controller so i was thinking 14 psi on second stage sould be fine to run.

 

[lancerevo92]

how do you tune these cars?

 

[CLuTZ]

how do you tune these cars?

With adjustable ECU's