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Originally posted by 96mercury:
Well many people are using a blow through setup without problems. It seams like I was told that a suck through system was a bad idea on this forumn and was given certain reasons why now that I am doing what was originally reccommended I am told that it is a bad idea for certain reasons. I know that turbo tom at focus fanatics reccomends a blow through setup and this guy actually makes and sells turbo kits for zetec focus cars. Tom has probably turboed more zetec focus cars then there are turbo contours in existance in the US so he knows his stuff. I agree that the timing issue presented by a mystery maf is not good so I am just going to get another maf housing at the junk yard. As far as oil on the maf wires my intercooler piping is clean and I have been turbo now for 3500 miles so I don't think that is an issue with a good turbo.
Either MAF will work fine WHEN PROPERLY TUNED, just blindly switching MAF's is a very bad idea. Tom is very good at tuning so take his reccomendations AND his tuning and it will run nice.
I offer PnP Heads for all durtec's details at PnPheads.com or jesse@pnpheads.com for details.
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Originally posted by 96mercury:
Well many people are using a blow through setup without problems. It seams like I was told that a suck through system was a bad idea on this forumn and was given certain reasons why now that I am doing what was originally reccommended I am told that it is a bad idea for certain reasons. I know that turbo tom at focus fanatics reccomends a blow through setup and this guy actually makes and sells turbo kits for zetec focus cars. Tom has probably turboed more zetec focus cars then there are turbo contours in existance in the US so he knows his stuff. I agree that the timing issue presented by a mystery maf is not good so I am just going to get another maf housing at the junk yard. As far as oil on the maf wires my intercooler piping is clean and I have been turbo now for 3500 miles so I don't think that is an issue with a good turbo.
Then take turbo Tom's advice and go with it.
I'm not forcing you to take my advice. On the other hand, I [censored] guarantee you he isn't cutting the sampling tubes out of his mafs when he tunes, draw thru or blow thru!
Former owner of '99 CSVT - Silver #222/2760
356/334 wHP/TQ at 10psi on pump gas!
See My Mods
'05 Volvo S40 Turbo 5 AWD with 6spd, Passion Red
'06 Mazda5 Touring, 5spd,MTX, Black
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Originally posted by warmonger:
Then take turbo Tom's advice and go with it.
I'm not forcing you to take my advice. On the other hand, I [censored] guarantee you he isn't cutting the sampling tubes out of his mafs when he tunes, draw thru or blow thru!
in all fairness he said he was going to replace it.
Goonz12: <---tries on mommy's cloths
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I've read, Tom says to put around 3 feet of straight pipe before the MAF in a blow-thru setup to help get rid of turbulance problems.
2000 Rio Red I4 Cougar
200whp & 210wtq at 9psi
254whp & 276wtq with NX 35shot
WRX TD04 Turbo, Cut Short Shifter, Strut Tower Bar, 17" ZN Wheels, Roush Springs, Starion Intercooler, NX 35 shot, HKS SS BOV, Full 3" exhaust,StreetFlight Chip
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Originally posted by Seawulf:
I've read, Tom says to put around 3 feet of straight pipe before the MAF in a blow-thru setup to help get rid of turbulance problems.
3 feet eh...
Straight out the hood or the fender... 
I don't know where else you are going to fit 3' of straight pipe. 
~~~
Back on the subject.
I don't like a blow through for one reason. Heat. The hotter the intake charge the less airflow the MAF read. The less airflow the MAF reads the less fuel. (load & airflow readings) The less fuel the leaner it gets. That's the exact opposite you want to happen as the intake charge temperature rises.
You just can't accurately tune for that on a dyno. A dyno tunes your settings at that specific time & conditions.
When the ambient goes up, your intercooler efficiency drops, or anything that causes the charge temp to rise it will effectively lean out the engine.
BTW - IAT only affects timing if you were thinking about that.
That means you can leave the tune overly rich & not very efficient or gamble.
Also the PCM's adaptive control is going to slightly work against a blow-through setup.
2000 SVT #674
13.47 @ 102 - All Motor!
It was not broke; Yet I fixed it anyway.
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Originally posted by DemonSVT:
I don't like a blow through for one reason. Heat. The hotter the intake charge the less airflow the MAF read. The less airflow the MAF reads the less fuel. (load & airflow readings) The less fuel the leaner it gets. That's the exact opposite you want to happen as the intake charge temperature rises.
Is that the reason for the loss in resolution?
Why wouldn't it give you more accurate readings? If you are measuring the actual flow and the actual temperature entering the engine, wouldn't that be ideal? Or does the heat adversely affect the MAF's accuracy?
Like 96mercury, I was also planning on blow-thru. The point about oil fowling the MAF is very good.
BP
Ben ---'96 Contour GL * Zetec ATX * Tan on Black steelies---
+++JRSC M62 Under Construction+++
My big-a$$ mod list. 
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Well so far I have 300 miles on the blow through setup and no problems with oil fouling it yet. I just got another project to make some $$$ so the tuning will have to wait until I get my new project fixed and sold. 
ATX MTX swap, rear drum disc swap, drilled rotors, ported intake, optim throttle body, CAI, 7.5L MAF, adj. fuel regulator, longtube headers, underdrive pulley, no EGR, low inpedence bigger injectors, 2002 Focus Swap
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Now that I think about it, I think Tom said just a foot or so infront of the MAF was needed. That's easily doable on a Zetec.
2000 Rio Red I4 Cougar
200whp & 210wtq at 9psi
254whp & 276wtq with NX 35shot
WRX TD04 Turbo, Cut Short Shifter, Strut Tower Bar, 17" ZN Wheels, Roush Springs, Starion Intercooler, NX 35 shot, HKS SS BOV, Full 3" exhaust,StreetFlight Chip
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Geez you kids are retarded.  The MAF is a HOT WIRE MAF - OK dimwits, now when you start pumping huge amounts of hot air across it, far and above it's original design of ambient air - it basically doesn't register the airflow correctly. So stop being frickin ignorant and listen!  Also no turbo on this planet is 100% totally oil sealed so you WILL coat the MAf wires and ruin it's efficiency further. I don't care how good you think you or you turbo are. Ah sh!t, do what you want - I wanna be the first guy to point and laugh when this engine goes boom as well. 
2000 SVT Turbo 295hp/269ftlb@12psi
#1 for Bendix Brakes Kits!
Knuckles rebuilt w/new bearings $55
AUSSIE ENDLINKS $70
Gutted pre-cats $80/set
A lack of planning on your part does not constitute an emergency on mine!
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Wow, Stazi. I hope that you don't teach for a living.  Nobody has ever listed the operational limits for our MAF. What are the tolerances and within what temperature range? If the MAF is trying to keep the wire at 400F, even a crappy intercooler dumping out 200F should be within range. Also, I'm guessing that the PCM biases the MAF readings based on the IAT. Again, within what limits? Until someone lists specifics, we can only figure it out through trial and error. Calling people retarded just because they are trying to learn just isn't cool. BP
Ben ---'96 Contour GL * Zetec ATX * Tan on Black steelies---
+++JRSC M62 Under Construction+++
My big-a$$ mod list.
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