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Old 01-16-2015, 11:20 PM   #1
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Default rebuilding again... need advise for fuel economy 4 turbo

Ok i had a build engine with weisco pistons and it made 200kws at 20 psi.

It seem to be uses a lot of oil like 1L atleast per 1000kms, and chews lots of fuel, it has 805cc tigie billet forged turbo cams and 9.1 compresstion

Now i am rebuilding it because it had low compresstion in cylinder 3, just need some advise on parts.

I am not looking for crazy hp it will be street driven say 95% of the time just want a fast canyon carver and daily driver.

I am thinking of going with 9.5 compresstion for better fuel econemy so sure what people views are but i'll put down a list of things i plain to buy for this build, i really wanted to get this one in 9.5 but they only have 9.1

https://www.pureperformancemotorspor...d-pistons.html

boundy billet oil Chromoly Pump
Going back to stock mazda speed cams
not sure about port and poilsh yet
is there anything people can recommed doing while, engine is still apart?

Last edited by bossplaya; 01-17-2015 at 02:17 AM.
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Old 01-17-2015, 01:35 AM   #2
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Hey bossplaya, you should make an intro thread and tell us a little about yourself and where you are from.
Also, give us some more info about your build.
It seems that you have some sort of turbo setup already. Did you upgrade the rods when the engine was originally built?
What kind of engine management are you using, and what is the best fuel you have available where you are?
Unless you have ethanol at the pump or a really good tune, it is safer to run lower compression pistons.
Give us some more information, and we can help you out better.
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Old 01-17-2015, 02:15 AM   #3
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hey thanks man, yeah i'm in australia car has a avo turbo kit with a t28 turbo, Haltech E8 ecu, already got eagle rods, arp headstuds not sure on valve springs all done, motor only done 20000 kms but was useing lots of oil long time ago

The best fuel here is 98 and easy to get to

thanks
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Old 01-17-2015, 10:15 AM   #4
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Quote:
Originally Posted by bossplaya View Post
motor only done 20000 kms but was useing lots of oil long time ago
next time build it better.
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Old 01-17-2015, 10:40 AM   #5
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i spend over 6k with labour bro m parts, but going to go with bullet proof pistons like ppm that cost 1k.

Its just one of the weisco let me down when cold compresstion would be low in cylinder 3
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Old 01-17-2015, 10:49 AM   #6
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It wasn't the piston's fault.

Wrong ring gap, improper installation, bad machining, wrong tune. These are all possible causes.
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Old 01-17-2015, 11:26 AM   #7
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true bro, well i'm going the extra step of going to the best guys to put engine together and tune so shall be worthwhile when done
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Old 01-30-2015, 05:56 AM   #8
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what is a good compresstion ratio for good fuel economy i am going with PPR forged 4032 one thicking of going with 9.5
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Old 01-30-2015, 08:00 AM   #9
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Quote:
Originally Posted by bossplaya View Post
what is a good compresstion ratio for good fuel economy i am going with PPR forged 4032 one thicking of going with 9.5
For all out fuel economy the piston location is more important than brand and comp ratio, just bolt any old piston to the floor board under your gass pedal and youll see a huge improvement in fuel economy.
Well in all seriousness high comp and low boost will be best if you have accsess of high octane fuel, the biggest change i see in fuel economy in my case comes from alignment and oem size tires.
I see a 4 mpg jump when i put on my stock size all seasons.
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Old 01-30-2015, 08:10 AM   #10
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YEAH I have 98 here so am going with 9.5, also i had 805cc cams, i am going with stock turbo cams now, should i tow my car to tune place before i start it up, or just drive it off boost? it usually runs a bit rich on cold and dont want to risk this bullsht again..

also not surpized with ur mpg rolling resistance does wonder, thak *** i have enkies, i usually only get 250km from tank thanks to this fuking **** blow by but hopefully with the stock cams and bit higher comp, if i get 350/400, i wont complain
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Old 01-30-2015, 08:11 AM   #11
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Hey mate I'm in Australia too and I have a built engine running 9.5:1 CR pistons. Fuel economy is still crap but I have a heavy boots.

I ended up buying a diesel 1 series to drive every day and keep the 5 for serious stuff, it works out cheaper and less stressful!

Cheers
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Old 01-31-2015, 05:57 AM   #12
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lol fuken can't win can we, wish u could fit a modern engine with direct injection and all the rest of the goodies love my old car with no driver aids or excess lame tech bs


Btw u have a winner of a mx5, i am also in brisbane same modol colour 5 to, top job on urs i'm sure we will bump in real life one day lol


Also i should add that i have a torson 3.9, i could go with this MiataRoadster 3.3:1 gearing, can anyone shed some light how much this would help, i'm gussing a 5% improvment in fuel economy
/

Last edited by bossplaya; 01-31-2015 at 07:24 AM.
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Old 01-31-2015, 08:47 AM   #13
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Also, i am looking at buying stock turbo cams, i currentally have tighe 805cc cams, i am just wondering if i only have to buy the intake cam or exhuast cam aswell?
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