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Rb25 Neo Turbo On Rb20det,

flake32

By flake32,
in Western Australia

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flake32 Collaborator

flake32

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just thinking is it worth the $800 for a remap?,has any one heard of engine failure due to this?..just wana do the righty by my engine...thanks

by the way the car is running 10psi,and has a big fuel pump,i have been giving her a bit of a thrashing lately, hope ive done no damage......

QWK32 Veteran

QWK32

Posted
Posted
just thinking is it worth the $800 for a remap?,has any one heard of engine failure due to this?..just wana do the righty by my engine...thanks

it might be ok. i was running a stock r33 rb25 turbo on my rb20 and untuned it was leaning out slightly on 13psi above 5500rpm. only to like 13.5:1 afr. your running less boost so it might not be leaning out too much but i think its best to get it atleast checked with a wideband o2 sensor just to know whats going on.

but if you really want to do right for your engine go for a remap, if not a safc.

daineisdabomb Collaborator

daineisdabomb

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it will b ok as the afm will compensate for the extra volume of air entering the engine. although u will find it will b running a lil lean as the boost has been raised. but it will do this even with the stock turbo. fittin a apexi SAFC-2 will fix this n b cheaper than a remap. it will also give u more top end power as the a/f ratio will b at a more power productive level. remember tuning is the most important aspect of the power and engine makes. an engine could hav all the bolt on's in the world but its the amount of fuel and air, and when it is ignited that makes the power

bubba Grand Master

bubba

Posted
Posted (edited)

Absolutely fine, I ran my RB20 with a series1 33 turbo for nearly a year on 12psi and regular heavy beatings :D

Oh and unless your fuel pump is dying (which it's likely not as you say it's got a bigger one) it's likely running rich as opposed to lean, what an SAFC will do for you is a cheap way to lean it out a bit and gain some more top end power.

I didn't bother with any of that shit and waited till I got the 30 in before I got it tuned properly (remap).

Edited by bubba
Douse Collaborator

Douse

Posted
Posted (edited)

I am about to put in a RB25 turbo from an R34 on to my RB20, and I was advised to get it tuned straight away as it will throw out all the air to fuel ratios......

If you boost the RB25 turbo to 12-14 psi, i would be a little concerned about it leaning out......

Edited by Douse
QWK32 Veteran

QWK32

Posted
Posted
I am about to put in a RB25 turbo from an R34 on to my RB20, and I was advised to get it tuned straight away as it will throw out all the air to fuel ratios......

If you boost the RB25 turbo to 12-14 psi, i would be a little concerned about it leaning out......

it will but not by much. the extra flow will be picked up by the afm and the ecu will do its best. like i posted earlier i was seeing afr's of around 13:1 on 13psi, so not too bad.

bubba Grand Master

bubba

Posted
Posted (edited)

My 20 w/25 turbo with stock fuel pump was seeing around 13.5:1 but boy did it go like a shower of shit heh.

Was pretty lean so did the fuel pump and untuned it made 246rwhp (@12psi) so I was pretty happy.

A tune will pretty much get rid of some of the lag (by smashing in timing down low) but I didnt see the need at that level, I preferred to save my money for the 30+bits.

Edited by bubba
Bunky_r31 Enthusiast

Bunky_r31

Posted
Posted

i ran a 34 neo turbo on my redtop 20 for ages with no tune, was very very rich, when it did go on the dyno the afr's dropped of the scale to below 10:1

got an old style safc tuned on it and picked up 50hp and heaps better fuel economy:)

ACTIV32 Collaborator

ACTIV32

Posted
Posted (edited)

hey guys while the suject is up i also put a r33 stock turbo on my rb20 and its untuned i havnt been thashing it but whenever i do give it some it has no power since the new turbo is that normal

Edited by ACTIV32
ACTIV32 Collaborator

ACTIV32

Posted
Posted
No that's not normal, can you quantify "no power"?

yer well the power is probally equal to a stock r32 with its original turbo

i put it in my self and i checked everything twice i dunno, bizzare

i thought you had to get a tune for it to start giving th correct boost

bubba Grand Master

bubba

Posted
Posted

Yeah did you use the actuator off your original turbo or off the new turbo?

R33 actuator is 5psi, R32 is 10psi. If you are using the R33 actuator and do not have a boost controller of some sorts then yes, it will feel rather gutless :thumbsup:

ACTIV32 Collaborator

ACTIV32

Posted
Posted
Yeah did you use the actuator off your original turbo or off the new turbo?

R33 actuator is 5psi, R32 is 10psi. If you are using the R33 actuator and do not have a boost controller of some sorts then yes, it will feel rather gutless :rofl:

well there is my problem i was going to use the old acuator but i think thats whats blew up my stock turbo and yer t is stock cheers for the help guys

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