4agze Converted To 4agte

[demotorsport]

just wondering

when people convert from 4agze to 4agte

 

1.does the computer run the engine well (such as fuel & timing)???

 

2.whats your experiances???

 

3.i have a tunned aftermarket ecu for a 4agze would it start and drive well enough before a full tune on a 4agte???

 

 

 

any1 done this or turboed a 4agze and took chargwer off as I'm intersted how your car went as its a common modification

i would love to know how your cars went cause I'm guessing the vacume,time to hit boost,timing and fuel would differ from supercharged to turbo

 

thank you

[Taz_Rx]

Does what ever computer you're running now have a MAP sensor?

 

If so the ECU gets a load reading off that to modify the tune for boost, so I can't see any reason why it wouldn't work with the turbo instead of the charger. Might need some fine tuning, but yeahs hould run....if it uses a MAP.

[demotorsport]

Does what ever computer you're running now have a MAP sensor?

 

If so the ECU gets a load reading off that to modify the tune for boost, so I can't see any reason why it wouldn't work with the turbo instead of the charger. Might need some fine tuning, but yeahs hould run....if it uses a MAP.

 

thanks for the reply mate

 

ecu has a built in map sensor good for 30psi

 

just wondering bout the questions i asked above cause

I'm guessing a turbo and supercharger would run totaly different when it comes to

vacume...time it hits boost....fuel map...timing map...

but I'm guessing

[Medicine_Man]

It has been done before, But performance is pretty limited..

[ae174agze]

i have not done it personally, but know a fella that has a ke35 with a gze to gte

and the fuel maps are different but he said if u run the same boost u get more power from the engine due to it being more efficient or something than in supercharger form but i can not back that up

 

i mean boost is boost i suppose its just delivered in a different way

Edited May 3, 2008 by ae174agze

[irokin]

i mean boost is boost i suppose its just delivered in a different way

 

But its about where the energy is taken from to compress the air. Waste heat energy is going to be more efficient than taking good crank energy away from where its needed.

[demotorsport]

I'm more worried about idle

I'm guessing the supercharger will be needing more fuel on idle then a turbo

I'm not 100% sure how supercharges work but I'm guessing that the turbo would create more vacume???

but I'm not sure at all i only say it as the crank will cause the charger to pump air on idle

but i spose a turbo would aswell from the exhaust fumes and pressure

never had a supercharged car so can't realy comment thats why I'm asking

i assume there wouldnt be much difference under full load more concerned on idle

 

what you guys think???

i spose if people turbo stock gze's and run ok without the charger and a turbo in its place

it might just work???

 

thats why i asked how the cars go after people do this modification cause its not every day people have a tunned charger map and go a turbo setup

but more common for people to turbo stock gze's and take the charger off

 

any people that have done it or problems faced or success stories would love to hear them

 

thanks every1

[oh what a nissan feeling!]

The only thing i can think of would be injector size, and fuel pressure, that could vary and affect your starting.

 

It is likely it would start and idle ok, and would get you to your local tuner.

 

don't even consider not getting it tuned for the turbo though :cool:

[ae174agze]

arnt standerd sc12's clutched on idol so there not spinning?

 

 

i think so

[AE25]

the std gze setup will turn the charger off at idle and low load situations like decelleration or cruising which is controlled by the ecu and a few sensors. if you change to aftermarket ecu the supercharger clutch relay needs to be made into a separate control. or just run it constantly. it depends how you set it up.

 

not that i've done it but know others that have.. the factory gze ecu should be well tuned for all running circumstances. and it seems to work fine with turbo so long as you don't go over the boost limit where it would cut out from factory.

with aftermarket ecu its a different story. an aftermarket ecu usually only gets tuned for the engine its running on. the tuner will have to guesstimate the settings outside of where it would usually run on the dyno in the case it does run differently after being tuned. so say it's tuned for 10psi up to 7500rpm and you then go put a turbo on it and run 15psi up to 8000rpm.. you'll be hoping like hell the ecu has accurate enough settings on the ecu map to cover the extra boost and rpm range.

 

and yes there will be a difference in efficiency between a turbo and supercharger.. the turbo will give more back pressure but won't put extra load on the crank like the s/c so there will be a differnce in air/fuel ratios.. how much depends on the engine and the turbo/supercharger. its probably a negligible amount? tho if the engine is tuned for absolute maximum power and you go do something that will require more fuel.. expect it to blow up! no engine is the same so for an accurate tune.. its best to get it dyno'd if you change the turbo or make any major changes to the engine.

also the engine should be tuned with a range of pressures from full vacuum for deceleration and idle, to full boost. an engine will experience all of these as it comes on and off boost at different revs or throttle position.

 

in your case.. i wouldnt think the idle or light boost will be a problem.. but i personally wouldn't use full throttle with aftermarket ecu until the ecu mapping has been checked for the turbo.

hope that helps

Edited May 6, 2008 by AE25