Loosing Power At 1St And Second Gear

[wiix]

Hi guys my r33 gts N/A is bogging down in power in 1st and 2nd gear at about 3 to 4,500 rev mark and wont go beyond that it is only a intermittent problem .

Things done to car at service...

1 fuel fiter and all rubber lines

2 air filter high flow

3 cleaned maf meter

4 new coils and plugs

5 new 10w-40 oil and filter

6 done all vacuum hoses

engine mods...

1 full 2.5'' system

2 high flow air filter not a pod

3 bigger injectors and fuel pump

4 turbo computer to control injectors as the n/a one inst tuned to run 370cc injectors.

With those mods the car runs fine but every now and again it wont rev in the first 2 gears it seems to do it if you drive stop turn it off and start it later and it will do the bogging thing.

[wiix]

fixed power issue now have a dead cylinder i change the fuel injectors it started run fine and test drive was all good got home went to start it it took a minute to start then it was missing on one of the cylinders it is a constant miss a dead cylinder

[Super Drager]

Turbo Ecu and Injectors on an NA? why? go back to standard and i bet it will go better.

[iseekool]

Hi guys my r33 gts N/A is bogging down in power in 1st and 2nd gear at about 3 to 4,500 rev mark and wont go beyond that it is only a intermittent problem .

Things done to car at service...

1 fuel fiter and all rubber lines

2 air filter high flow

3 cleaned maf meter

4 new coils and plugs

5 new 10w-40 oil and filter

6 done all vacuum hoses

engine mods...

1 full 2.5'' system

2 high flow air filter not a pod

3 bigger injectors and fuel pump

4 turbo computer to control injectors as the n/a one inst tuned to run 370cc injectors.

With those mods the car runs fine but every now and again it wont rev in the first 2 gears it seems to do it if you drive stop turn it off and start it later and it will do the bogging thing.

Stick with the N/A computer and re-map to suit bigger injectors.

[wiix]

i cant get the computer remapped apparently and the bigger injectors were in stalled because i was going to bolt a turbo on but was told it will blow my engine so last nite i put it back to n/a standard but the old injectors are leaking and need new orings

[mad082]

running an ecu from an engine that is designed to have lower compression and a turbo bolted to it isn't going to be helping one bit. it may even be causing some serious damage to your engine, depending on what the AFR's are like.

[wiix]

it was running rich over fueling i had it on the ecu talk on the laptop

[Captain Natro]

it was running rich over fueling i had it on the ecu talk on the laptop

Well straight away an excessively rich motor won't make any power...

[wiix]

yea lol i was going to turbo it but was told it would blow it up so i tried to see how it would go with those injectors appears no good so its all back to n/a standards but waiting on new injector orings for the stock injectors as there leaking

[Captain Natro]

yea lol i was going to turbo it but was told it would blow it up so i tried to see how it would go with those injectors appears no good so its all back to n/a standards but waiting on new injector orings for the stock injectors as there leaking

Who said it would blow up, running <7 psi should be fine, many people have done it infact there's a sticky in the NA section about it

http://www.skylinesaustralia.com/forums/topic/249186-nat-power-results-na-t-turbo-conversions-only/page__pid__6587345__st__140#entry6587345

Edited January 24, 2013 by Captain Natro

[wiix]

a mate of mine said who is a mechanic but has a skyline said it wouldn't work unless i run low boost like 4psi

[Captain Natro]

a mate of mine said who is a mechanic but has a skyline said it wouldn't work unless i run low boost like 4psi

It has to do with the compression ratio of an NA motor being higher then that of a turbo motor, resulting in a higher likely hood of detention on pump fuel even at the same boost levels. But in saying that there is power to be made from de+t ing an RB25.

Hell my mate had an old dirty thirty Natro, bolted on a ling long spec 35 and made great power for what it was, has just purchased a water meth kit for it and with more boost wound into it should see fairly decent figures...

I'm not going to say this is the best option but it definetly is one (just have a read through that thread you'll see)

[wiix]

nice would it be ok if i would run 98 octane or will it detonate could also run colder plugs as well maybe

[Super Drager]

a mate of mine said who is a mechanic but has a skyline said it wouldn't work unless i run low boost like 4psi

Your mate is a complete dumbass. Its been done before, there's a dude on here running 18psi through one on 98 octane. Been going for a few years too.

[wiix]

if i were to turbo it

[wiix]

this is building up confidence and i will save up for the stuff so i can convert it i need hoses intercooler oil cooler turbo piping stock turbo i have need seal or i might buy a new one pump is done an radiator is done old rad exploded one day after i got home

[Captain Natro]

Your mate is a complete dumbass. Its been done before, there's a dude on here running 18psi through one on 98 octane. Been going for a few years too.

I'm trying to remember who it was but its not coming to mind, may of been hanaldo maybe I duno it's irrelevant.

More to the point it can be done and with quite pleasing results. What would get most people I imagine is getting greedy and continuing to wind more and more boost in, in this situation with the high comp (something like 9.5:1? Not exactly sure) it will go pop....

[Captain Natro]

this is building up confidence and i will save up for the stuff so i can convert it i need hoses intercooler oil cooler turbo piping stock turbo i have need seal or i might buy a new one pump is done an radiator is done old rad exploded one day after i got home

*cough* Read that thread first *cough*

Edited January 24, 2013 by Captain Natro

[Super Drager]

I'm trying to remember who it was but its not coming to mind, may of been hanaldo maybe I duno it's irrelevant.

More to the point it can be done and with quite pleasing results. What would get most people I imagine is getting greedy and continuing to wind more and more boost in, in this situation with the high comp (something like 9.5:1? Not exactly sure) it will go pop....

I know quite a few turbo cars that run 9.5:1 comp and 20+psi on 98 octane its all in the tune. Aslong as everything is kept in check it will live a long and fun life.

[Captain Natro]

I know quite a few turbo cars that run 9.5:1 comp and 20+psi on 98 octane its all in the tune. Aslong as everything is kept in check it will live a long and fun life.

It could be more then that (its been a while since I cared about Natro RB motors). Tune is very important but that's like any car the tune makes or breaks the setup.