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SipposBFT

ENGINE BUILD

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Hi All

yes like many of us XR owners around Aus... The stage 1 tune has lost it's appeal & now bigger things are on the card.

Just want to confirm that've there's no reason I can't build a NA barra engine into a turbo? Would I be better off going for a BA/BF  or FG donk?   

The plan is spool rods/forged pistons, arp head studs & crow springs/retainers. Of course a standard reco of the head is also in the plan. Head gasket recommendations? My plan is to tune this to 450rwkw. Any other advise would b awesome

 

cheers 

 

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if sticking to the 450kw area

 

just buy a FG f6 short motor throw it in away you go. 

 

throw in head studs/ valve spring, all your bolt on ons and your good.

 

assuming a good tuner is used as well.

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build a high compression motor just for E85 :P hahahha but watch out you'll probably have mattyp come and actually recommend this.

 

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If I were to do it all again, I'd just do valve springs, oil pump gears, head studs, rods and freshen up the head. (assuming bottom end is mickey mouse)

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Just go FG F6 engine - with headstuds, oil pump gears & valve springs .... At times I feel I should have done this

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Im having the same head funk atm with this,

You can 100% do a NA build, id go which ever motor has done the least km.

 

Ive been looking over Atomic 698 phase 2 kit 

Or Spool kit, or F6 short.

 

F6 short will get 95% of the way id like to one day go,

Atomic 698 is all the way and then some, the price difference is about 10k though :ermm:

Ad to that a full drive line transplant = FARK

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Thx 4 the input guys ... Question... F6 has same rods as XRT ? Think I want a bit more re-assurance than this... Where do I get pump gears from? These just increase flow or pressure?  E85 has crossed my mind. 

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build a high compression motor just for E85 hahahha but watch out you'll probably have mattyp come and actually recommend this.

 

Well you want the best bang per litre high comp boost on e85 is the way to go

All about that BSFC!

But in reality most aren't huge fans of efficiency like I am or have access to ethanol close by. The standard low comp pistons are incredibly versatile. Can even run 94e10 @365rwkw and done 12 flat on it with huge gearbox issues.

Fg f6 has a stronger short block than the xr6s, I believe it's bigger rods. Best to ask the guys who've pulled em apart 100 times

Who's your tuna?

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Won't do a high- comp turbo to run on E85... Wud just consider tuning on E85 4 extra tuneable power ... I have the Herrod E85 compatible pump so it allows the option... My tuner 4 current tune is Tunehouse... But am considering spending a few weeks in Melbourne for a holiday & getting Nuzpro to fit the upgraded ZF box & tune ... They're proven & cheaper than tunehouse 

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Looks like F6 has stronger rods , but block is same... Still think spool or alike wud b the way to go ... Yeah tuners in syd are hit & miss from my experience... Seen sum guys get great results & then sum hav engine failures from the same stable... Gonna really research that area 

image.jpg

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The rods are the same between xr and f6, been the same from 06/06. The Fg f6 has different pistons. Same comp ratio just got a semi forged mahle I believe.

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AND... I'm really getting annoyed with this friggin turbo-exhaust flange bolts which keep coming loose!!!! Tunehouse changed bolts to studs (with a gasket )but even they come loose & 1 has even fallen out !! .. don't want to change to a top mount manifold... Can I run an FG? 

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Nordloc's are the way to go, and don't be tempted to overtighten the studs as they will only strech once hot.

 

If you want to fit a set of nordlocs let me know, My supplier will sell them indivually at excellent pricing.

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Thankyou ralf... I will let you know 4 sure... But was under the impression FGs don't suffer from this... My mate worked @ peter warrens & said FGs didn't seem to suffer... Even tony from Tunehouse had the same opinion ... Let's hope this wks 

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Got my FG F6 motor apart and they're definitely a cast mahle piston, but they are different. I believe HI PSI said the same about his short motor when he got his, and also read an article recently by someone who a lead designer or something at FPV who also said they arent forged but a different heavier design and lower compression. Theres a BF into the 8's on stock cast turbo pistons so its not the weak point of the engine anyway. 

 

... and mattyp is right. High comp turbo e85 is the only way to go!

Edited by luke187

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51 minutes ago, luke187 said:

Got my FG F6 motor apart and they're definitely a cast mahle piston, but they are different. I believe HI PSI said the same about his short motor when he got his, and also read an article recently by someone who a lead designer or something at FPV who also said they arent forged but a different heavier design and lower compression. Theres a BF into the 8's on stock cast turbo pistons so its not the weak point of the engine anyway. 

 

... and mattyp is right. High comp turbo e85 is the only way to go!

Great info luke ... Thankyou ... I do understand yr hi comp favouritism .... But I want to b able to run on 98 as well as possibly E85... My last car (r31 RB 30t ) was tuned on E85... Mainly cause the pistons used were too high to run on 98... In short was a pain as I had to travel out of my way to fill up... & as it's also my only set of wheels I also take long trips with her.  

Curious ... Did u buy the engine from a salvage yard or do u own an F6?  If U bought how much? 

 

Edited by SipposBFT

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Benefits of living so close to e85 servos and everywhere I go there is an e85 servo (Kempsey for the inlaws, canbra for the family and several on the cenny coast)
Im a lucky man, Also I think it is far more ethical to use e85 as its giving money to locals rather than sending it over to the saudis, it may cost a little more (alot more around town) but its worth it imo.
Even if you need petrol add water injection and back the petrol tune way off until you can switch back to the jungle juice

 

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