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Old 03-04-11, 21:34   #1
gold-vlt
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Can a vlt be economical up to 250kw?

This may be somewhat of a stupid question but i just wanted to know if a vl turbo can still be fuel efficient when driving under normal conditions and accelleration if the car has a good tune and is somewhere over the 200kw mark?.. say 230kw.
I was just wondering what sort of economy people on here receive that have around this power mark. between 200 and 250kw atw.

If my plan still goes ahead with my motor it will be about 9:1 comp ratio rb30/25, a smallish turbo such as t3/t4 lowmount on moderately low boost, fm intercooler, 25det injectors, standard or mild cam. Im just after a mild streeter with plenty of torque and hopefully not too bad fuel consumption for what it is.
Let me know what you think and what sort of economy you get.
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Old 04-04-11, 08:33   #2
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I got 230 rwkw & get 10L/100kms if I drive it sedately. Put the foot down though and wave bye bye to fuel economy.

It's all in the tune, and driving style.
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Old 04-04-11, 21:58   #3
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I'd say its all in the tune & driving style. My VL has a aftermarket computer and it has get better fuel economy from it than my R33 (I drive the 33 like a wanker & granny the VL) Also depends on what computer your running. If you get something that has closed loop and a proper cold start it should be good. Microtech's i've seen in peoples cars have all been rubbish and they get bad fuel economy.
Your build sounds good but don't use the rb25 injectors. They are too small for that motor. JDM s15 injectors are bigger & a good cheap upgrade. rb25 injectors are 370cc & JDM S15's are 480cc.
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Old 05-04-11, 16:45   #4
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as has been said mate, its all in the way u drive it. people think that cause its turbo its automatically bad on fuel... they dont realise that for daily driving, the turbos, even tho small, are rarely on boost that often anyways, unlike v8s where they always carry the capacity and are way worse on fuel. so yeh man, long as you drive it to speed limit an off boost, you will get decent economy no wuccas. plant ur foot an watch the dial move to zero like any turbo car..
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Old 05-04-11, 17:19   #5
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If anything turbo cars are better for economy as long as you drive it sedately!
My Na VL Calais got 13L 100km, when turbo conversion was done, i drove it the same and still got 13L 100km, boost everynow and then!
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Old 05-04-11, 17:24   #6
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mine was horrible with 230rwkw odd... all city driving though, would go through $120-$150 a week...although rarely got driven nicely
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Old 05-04-11, 17:31   #7
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mine was horrible with 230rwkw odd... all city driving though, would go through $120-$150 a week...although rarely got driven nicely
yeh well u can hardly say that thats a fair arguement if your thrashing the **** outa it. some bloody 1.3L crapper would prob drink fuel if you thrashed it as well lol
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Old 05-04-11, 19:00   #8
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yeh well u can hardly say that thats a fair arguement if your thrashing the **** outa it. some bloody 1.3L crapper would prob drink fuel if you thrashed it as well lol
not like it was power skids all over the place, most sitting in traffic and then taking out a short amount of anger before coming to a stop again
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Old 05-04-11, 20:14   #9
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Quote:
Originally Posted by InsaneVL View Post
I got 230 rwkw & get 10L/100kms if I drive it sedately. Put the foot down though and wave bye bye to fuel economy.

It's all in the tune, and driving style.
man that is excellent for 230kw.. may i ask what comp and mods you have?
And as for injectors i really wasnt sure. just because the injectors are more cc doesnt mean they are constantly flowing more fuel just that they can supply more fuel before they max out am i correct?

im still collecting parts for the top end for my engine build so i havent got injectors just yet only complete head (will be running vct) with exhaust and rebuilt standard t3. Im worried that the turbo will be much too small for the 25/30 and will come onto boost much too quick because of its size.
Because i dont want to run massive boost thats the reason i want to buy higher compression pistons. so that the car will have enough go at lower rpm. Should i buy a larger turbo that will spool up more gradually? Any ideas for a good quality well priced turbo to suit???. Remember im after between 200 and 230kw and im more so after lots of torque and really good midrange power with decent top end. dont care about top end power so much.
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Old 05-04-11, 20:59   #10
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its either power or economy,, you cant have both
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Old 05-04-11, 21:10   #11
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its either power or economy,, you cant have both
I was waiting for this comment.. I will be happy with 200 - 230kw for a quick street car. and if i can get similar economy to others on here with this power then i'll be more than happy with that. And i believe you can have both but not to extremes.
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Old 05-04-11, 21:25   #12
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Originally Posted by NUT-30T View Post
its either power or economy,, you cant have both
Sorry couldnt help myself

http://www.gminsidenews.com/forums/f...sie-six-85591/

I realise the results are skewed but try getting 7.4L/100ks from a 425hp 6.2L 10 years ago even if it is "hypermiling"
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Old 05-04-11, 21:42   #13
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Originally Posted by gold-vlt View Post
I was waiting for this comment.. I will be happy with 200 - 230kw for a quick street car. and if i can get similar economy to others on here with this power then i'll be more than happy with that. And i believe you can have both but not to extremes.
jus do it man an dont worry so much about the economy. rb30s (even tho they are 25 odd years old now) are still quite economical engines by todays standards. The injection was done well and there usually a (i say usually cause i to have had my fair share of moments lol) smooth, well running motor. Their consumtion is were waaay beta than the aussie 3.8L v6, I would almost say even when turbo'd, so i believe yeh you can have moderate power an 'moderate' economy at the same time. Realisitically ud prob be looking at around 13-14L / 100km i reckon for a standard run of the mill vl turbo. Thing is, ur cars not going to be newhere near as bad a 3.3L blue motor type or a v8, an if your that worried then you shouldnt really be building a vlt, cause theres obviously other cars that are made with economy in mind.

So just do what you want bro an drive it easy around town an you will be happy with the economy. Like i said, they only drink when you hit it chow
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Old 05-04-11, 22:31   #14
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Quote:
Originally Posted by gold-vlt View Post
man that is excellent for 230kw.. may i ask what comp and mods you have?
And as for injectors i really wasnt sure. just because the injectors are more cc doesnt mean they are constantly flowing more fuel just that they can supply more fuel before they max out am i correct?

im still collecting parts for the top end for my engine build so i havent got injectors just yet only complete head (will be running vct) with exhaust and rebuilt standard t3. Im worried that the turbo will be much too small for the 25/30 and will come onto boost much too quick because of its size.
Because i dont want to run massive boost thats the reason i want to buy higher compression pistons. so that the car will have enough go at lower rpm. Should i buy a larger turbo that will spool up more gradually? Any ideas for a good quality well priced turbo to suit???. Remember im after between 200 and 230kw and im more so after lots of torque and really good midrange power with decent top end. dont care about top end power so much.

Compression - standard turbo a8 block & pistons = 7.8:1
ECU - NisTune. (Good for cold starts & closed loop mode)
Mods - running 650cc injectors, high flow t3 turbo, intercooler, 3" exhaust.
This is through an MX7 5sp. The 10L/100km is very sedate driving, I doubt i'd get the same through an auto, or too much "city" stop start driving. Not a snowflakes chance in hell when coming on boost either.. lol.. Even with a "small" turbo like the standard t3 it's easy to get around without having to come on boost.
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Old 05-04-11, 22:51   #15
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i was getting 450+ out of a tank with 260rwkw on 14 psi when driving like a nun
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Old 06-04-11, 11:54   #16
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Quote:
Originally Posted by Andy-30L View Post
jus do it man an dont worry so much about the economy. rb30s (even tho they are 25 odd years old now) are still quite economical engines by todays standards. The injection was done well and there usually a (i say usually cause i to have had my fair share of moments lol) smooth, well running motor. Their consumtion is were waaay beta than the aussie 3.8L v6, I would almost say even when turbo'd, so i believe yeh you can have moderate power an 'moderate' economy at the same time. Realisitically ud prob be looking at around 13-14L / 100km i reckon for a standard run of the mill vl turbo. Thing is, ur cars not going to be newhere near as bad a 3.3L blue motor type or a v8, an if your that worried then you shouldnt really be building a vlt, cause theres obviously other cars that are made with economy in mind.

So just do what you want bro an drive it easy around town an you will be happy with the economy. Like i said, they only drink when you hit it chow
yeah man i realise theyre good motors as they deliver both power and decent economy i just wanted to see how they fair when pushed that bit further up the the 250 mark. Im building the motor regardless of economy but just wanted to see what i could be looking at. I do think i will have to adjust my driving style just a little bit . but when youre driving an na without much power you tend to give it a bit just out of frustration.

---------- Post added 06-04-11 at 12:13 ----------

Quote:
Originally Posted by InsaneVL View Post
Compression - standard turbo a8 block & pistons = 7.8:1
ECU - NisTune. (Good for cold starts & closed loop mode)
Mods - running 650cc injectors, high flow t3 turbo, intercooler, 3" exhaust.
This is through an MX7 5sp. The 10L/100km is very sedate driving, I doubt i'd get the same through an auto, or too much "city" stop start driving. Not a snowflakes chance in hell when coming on boost either.. lol.. Even with a "small" turbo like the standard t3 it's easy to get around without having to come on boost.
Oh yeah i thought it would be a setup like that. Since i'll need a new box im getting a gtst 5speed. Im over auto. I didnt realise a t3 could be driven without coming on boost all too early on a 30det motor. I thought the exhaust pressure would somewhat be upped to an extent with the extra capacity and extra flow. At this point im looking at either a vi-pec or haltech ecu to run the 25/30 should work well with the vct too. I'll be looking into ecu's more at a later time. Im not sure how well the standard 25 ecu will work with the setup.

Last edited by gold-vlt; 06-04-11 at 12:16.
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