did you make that MAF table team?
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Went in to see how it was going yesterday . Just the downpipe and WG pipe to do . ETA mid next week . Bit disappointed with the inability to go big on the inlet and outlet pipework . Having the WG forward has really compromised that part of the design .
So , it better spool up good cuz top end may be a bit disappointing . |
Originally Posted by TeamRX8
(Post 4704767)
it's a lot easier for me to just mail him one ... :lol:
Thanks Sorry Brett I know this has nothing to do with your build! |
Brettus, did you consider going MAFless? or did you want the ability for g/s measurement to stay?
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Originally Posted by shambo
(Post 4708016)
Brettus, did you consider going MAFless? or did you want the ability for g/s measurement to stay?
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Originally Posted by Brettus
(Post 4708018)
I like the factory drive-ability i get with maf tuning . I will persist with it unless I see a good reason not to .
forgive me if i've missed it but are you running 1600cc injectors for this power level? they seem to be about right for this setup, keeping the 2 stock primaries? |
Originally Posted by shambo
(Post 4708019)
furry muff :)
forgive me if i've missed it but are you running 1600cc injectors for this power level? they seem to be about right for this setup, keeping the 2 stock primaries? Sec= blue P2= uncapped yellow Works out to around 2800ccs all up . |
Originally Posted by Brettus
(Post 4708029)
Works out to around 2800ccs all up .
I must have worked something out wrong then, gonna go check my math, :lol: *edit* just worked it out again and i'm coming up with around 5100cc required :confused: working on AFR of 10:1 to be on the safe side... |
Brett, are you running a return line?
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Originally Posted by shambo
(Post 4708033)
:icon_droo :Drooling_
I must have worked something out wrong then, gonna go check my math, :lol: *edit* just worked it out again and i'm coming up with around 5100cc required :confused: working on AFR of 10:1 to be on the safe side... Just using the matchbot program it comes to 280lb/hr at 11.0 AFR for 450 flywheel hp gasoline specific gravity = 0.74 so (280/0.74 )/2.2lbs/kg /60 = 2.866 L/min =2866ccs Leaves me no headroom so I will probably need to upgrade |
Originally Posted by stinksause
(Post 4708056)
Brett, are you running a return line?
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62 lb/min @ 10:1
62 lb/min air mass / 10 = 6.2 lb/min = 372 lb/hr fuel mass required 372 lb/hr / 0.85 max injector duty cycle = 437.7 lb/hr = ~4600 cc/min injector capacity .
Originally Posted by Brettus
(Post 4708059)
2800 will be marginal for 400whp but 5100 is way overkill ...
Just using the matchbot program it comes to 280lb/hr at 11.0 AFR for 450 flywheel hp gasoline specific gravity = 0.74 so (280/0.74 )/2.2lbs/kg /60 = 2.866 L/min =2866ccs Leaves me no headroom so I will probably need to upgrade |
2866 cc/min = 273 lb/hr = 4.55 lb/min max capacity
4.55 lb/min x 0.85 max duty cycle = 3.87 lb/min max capacity available 60.2 lb/min air mass / 3.87lb/min fuel mass = 15.6:1 AFR Seems like plenty of off-with-your-head room ... lol . |
Originally Posted by TeamRX8
(Post 4708071)
2866 cc/min = 273 lb/hr = 4.55 lb/min max capacity
4.55 lb/min x 0.85 max duty cycle = 3.87 lb/min max capacity available 60.2 lb/min air mass / 3.87lb/min fuel mass = 15.6:1 AFR Seems like plenty of off-with-your-head room ... lol . I've already run it to 375whp with no lean out ..........so do the math on that ;) It's only 55lb/min air (according to matchbot) at 11.0 AFR . Work that out at 100% DC and you can see ............... no headroom . But it's not going to lean out like you suggest |
Originally Posted by Brettus
(Post 4708059)
2800 will be marginal for 400whp but 5100 is way overkill ...
Just using the matchbot program it comes to 280lb/hr at 11.0 AFR for 450 flywheel hp gasoline specific gravity = 0.74 so (280/0.74 )/2.2lbs/kg /60 = 2.866 L/min =2866ccs Leaves me no headroom so I will probably need to upgrade |
Originally Posted by logalinipoo
(Post 4708119)
Is that 2800 at stock flow 3 bar or is that corrected for our aditional fuel pressure?
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Hmmmmm .... maxed out the maf on my first log ..... :p:
This was at 14psi. https://cimg2.ibsrv.net/gimg/www.rx8...70b56e21c1.png |
Originally Posted by shambo
(Post 4708124)
if 2800cc is @ stock and he's running 100psi through them, the flow is closer to 4200cc/min.
Running logs already and no pics? What is the spoolup looking like? |
Originally Posted by Brettus
(Post 4708127)
Hmmmmm .... maxed out the maf on my first log ..... :p:
This was at 13psi ! https://cimg2.ibsrv.net/gimg/www.rx8...70b56e21c1.png Looks pretty smooth though. Is spool as quick as you thought it would be? |
Originally Posted by TeamRX8
(Post 4708130)
Wut? Have no recollection of him running anything other than the OE pump bypass which is typically near 60 psig, maybe a little higher with a super high flow fuel pump due to bypass flow restriction. The boost pressure has to be subtracted from fuel pressure to determine the net injector working fuel pressure.
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In short :
Boost control is superb Power is awesome at the top end Spoolup is not great .... I think I know why but would like to test a few things before confirming this. |
Spoolup is overrated anyway :lol:
I take it your first impressions are good then? :) |
Originally Posted by shambo
(Post 4708134)
Spoolup is overrated anyway :lol:
I take it your first impressions are good then? :) I don't think 400whp will be a problem ... which is great . But the spoolup is big disappointment at this stage as it was just as important to what I'm trying to achieve. |
Good stuff. Even if it's spooling @4k that still gives around 5krpm of usable boost. If it's spooling later then I feel your pain. Have u got enough pd across the turbine? :)
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Originally Posted by shambo
(Post 4708138)
Have u got enough pd across the turbine? :)
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