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Thoughts On R25 On Eflex Vs The Rb30 Route .

discopotato03

By discopotato03,
in Engines & Forced Induction

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discopotato03 Grand Master

discopotato03

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Well so far it owes me $20 worth of fuel hose and the apple juice itself . Having that Eflex servo closer than the other two seals the deal and fingers crossed more around soon .

My car should go better again with a propper tune and if it has better part throttle torque than now it can probably use a bit more intercooler and turbo .

It still breaks traction in second (pre Eflex and a cold dry morning) but the Mitchy Super Sports are on the water and should help improve traction . If it doesn't will need a better diff center .

First cold start soon , cheers A .

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discopotato03 Grand Master

discopotato03

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Ok first cold start took about threeish seconds to fire and ran well . I got a wiff of the good stuff so must be tossing plenty in .

I have not touched any cold start stuff yet but I'm thinking of increasing the cranking enrichment rather than the actual coolant temp based enrichment .

It was a slightly jerky around 1500 revs but I've altered a few other things which I think will solve that .

This Eflex makes my engine run smoother and idle better than Ultimate 98 did . I've mainly been trying to make it drive nicely at low revs and ATM it pulls smoothly away at 12-1300 revs in 3rd so no complaints there . I'm not sure what timing numers I can input at low revs and light loads so just playing around with this ATM . This car was always a bit touchy at very low revs in 1st and its lightened flywheel doesn't help with slow speeds and taking off . Its much better now and getting better as I muck around with the PFCs settings .

Overall I think going to E85 , well Eflex anyway , is a good step to take because it allows you to get the best out of your current engine with tuning and is far simpler than changing engines . In my case I already had the Z32/PFC/GTR pump/740s in place and getting it to run acceptably with a few corrections has not been real difficult . Andrew pointed out to me that the only easy legal way to get a 30 short block in was to tune for emissions compliance and take that to a willing engineer to certify . I'm going to see how this RB25 goes and I have a feeling I'll outgrow the GTRS and GTt SMIC in the not too distant future . Really the intercooler needs to be upgraded first and then a tune should show how far a GTRS can go on an RB25DET . I have seen some impressive dyno numbers for a GT28 based turbo in the dyno results section - upwards of 270 RWKW though a lot of other things were improved to get it there . Things like headwork Poncams FMICs e85 injectors - and a good exhaust .

A .

ARTZ Grand Master

ARTZ

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yeah the low down torque of e85 is brilliant..my skyline drives like my turbo diesel Ute down low now , which means I don't have to drop it back a gear to get it moving all the time even with a lightweight flywheel

You won't look back disco.. :D

discopotato03 Grand Master

discopotato03

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I gave it a bit more cranking fueling for this mornings cold start but I don't think that made much difference . I really have to get the Tech Edge in to see whats going on . Um also need to keep an eye on the fuel filter , don't suppose someone can tell me the Ryco one for an R33 so I can go grab one or two .

After searching I think the std replacement is a Z201 but the larger diameter Z202 from the R31 and 300ZX Turbo may have more filter area .

Cheers A .

Edited by discopotato03
Piggaz Grand Master

Piggaz

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I gave it a bit more cranking fueling for this mornings cold start but I don't think that made much difference . I really have to get the Tech Edge in to see whats going on . Um also need to keep an eye on the fuel filter , don't suppose someone can tell me the Ryco one for an R33 so I can go grab one or two .

After searching I think the std replacement is a Z201 but the larger diameter Z202 from the R31 may have a bit more filter area .

Cheers A .

From personal experience, that "OMG, your filter is gonna clog up with 10 kg worth of shit by the time you drive around the block" is rubbish. I ran mine for 6 months and had a look at it and both filters were clean as.

discopotato03 Grand Master

discopotato03

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Actually I mentioned this crud into alky converted cars business to Gary (Sydneykid) and he said provided cars are driven from full tank to almost empty often it shouldn't be a problem . He said many people never run their cars below half a tank but the day they have to go to virtually empty they get a system full of crud .

Anyway they opened the filter on their Lancer and it was clean too . I was planning to run this first tank of Eflex through and then replace the filter which has been there for 19k km .

A .

scotty nm35 Grand Master

scotty nm35

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The sock filters on my Walbro's are black, there is definitely something very fine slowly building up on them over time. I came to the conclusion last year that there must be a slight sediment in the fuel as my fuel system checks out. I have been on e85 for over 3 years now (daily) so any original crud would have been cleaned out surely. From my searches it seems like a common problem in the US, perhaps carbon from some filtering process?

No big deal to change filters every few years though...

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