Max WHP of 240cc + FMU turbo setup?
12-23-2006, 11:27 AM
#11
1.5 BAR
Join Date: Jan 2006
Posts: 670
Re: Max WHP of 240cc + FMU turbo setup?
Originally Posted by Joseph Davis
The stock ECU is already tuned for 240cc injectors. How the ---- is Crome Pro going to do anything? 
12-23-2006, 05:36 PM
#13
0.0 BAR
Join Date: Dec 2002
Posts: 0
Re: Max WHP of 240cc + FMU turbo setup?
Originally Posted by MADMAX
How do you go past 100% duty cycle?
That's like flipping the light switch more on. <---- more... on,..... moron. That's it.
Well if you havent done it then well what do you think a fmu does. people have supported well over 300+whp on fmu's you think a 270 injector is capable of that
And yes I tuned a 280+whp all motor car that way so blah
12-23-2006, 06:16 PM
#14
Guest
Posts: n/a
Re: Max WHP of 240cc + FMU turbo setup?
Originally Posted by chris
Well if you havent done it then well what do you think a fmu does. people have supported well over 300+whp on fmu's you think a 270 injector is capable of that
And yes I tuned a 280+whp all motor car that way so blah
12-23-2006, 06:20 PM
#15
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Join Date: Dec 2002
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Re: Max WHP of 240cc + FMU turbo setup?
Originally Posted by jagojon3
You tuned an all motor car with an fmu? :P
Car ran 11.30 fully body crx and ran a full sesaon this way with an ungodly amount of dyno pulls
good ole zdyne
12-23-2006, 10:26 PM
#16
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Join Date: May 2005
Posts: 0
Re: Max WHP of 240cc + FMU turbo setup?
Originally Posted by chris
Well if you havent done it then well what do you think a fmu does. people have supported well over 300+whp on fmu's you think a 270 injector is capable of that
And yes I tuned a 280+whp all motor car that way so blah
An FMU simply increases the pressure to already operating injectors, or with enough fuel pressure locks them open, which if injectors are open all the time = 100% duty cycle.
I hope you are not thinking those values in CROME are accurate.
Originally Posted by chris
no duty cycyle was at 101 100 percent at wot and alot of fuel pressure
Car ran 11.30 fully body crx and ran a full sesaon this way with an ungodly amount of dyno pulls
good ole zdyne
Car ran 11.30 fully body crx and ran a full sesaon this way with an ungodly amount of dyno pulls
good ole zdyne
Originally Posted by MADMAX
I hope you are not thinking those values in CROME ZDYNE are accurate.
12-23-2006, 11:59 PM
#17
3.0 BAR
Join Date: Apr 2005
Posts: 4,890
Re: Max WHP of 240cc + FMU turbo setup?
Originally Posted by MADMAX
An FMU simply increases the pressure to already operating injectors, or with enough fuel pressure locks them open, which if injectors are open all the time = 100% duty cycle.
this could be the dumbest thing i ever heard
12-24-2006, 12:05 AM
#18
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Posts: n/a
Re: Max WHP of 240cc + FMU turbo setup?
Originally Posted by MADMAX
I hope you are not thinking those values in CROME are accurate.
After a few times tuning I just started getting a feel for it. If I just change the value in the cell 1 or two points I end up where I want to be though .
It would be nice if the math would just work everytime but oh well.
12-24-2006, 12:06 AM
#19
1.5 BAR
Thread Starter
Join Date: Mar 2005
Posts: 723
Re: Max WHP of 240cc + FMU turbo setup?
I had a nice, nasty response for Jago and DMC1 before the rest posted, but my web died for a while. Oddly enough, my post on HT got much better responses, they actually seemed to not only read the whole post, but try to comprehend it.
As others have now posted *correctly* that 240cc injectors really can't do much more than 175whp (at 42psi) if you want anything below 13:1 AFR's, and that maybe, just maybe, the first two posters can think it through that an FMU's rising rate is predictable, then they can understand how you could mix crome and an fmu. After all, an FMU is just a heavy-duty FPR, except the OEM fpr is 1:1 where the FMU is >2:1 in boost, depending on the brand/adjustability. That bearing in mind, the FMU will allow the fuel pump to opperate like normal, and then kick it in the nuts only during full boost. IMO thats really the only issue here, but OEM pumps don't fail all that often, at least compaired to Walbro pumps.
Anyways, very little driving around here is start/stop, so most people wouldn't be boosting every 10 seconds. I would imagine that if my brother's integra pump lasted as long as it did, I could imagine that it is probably better to have the pump see 90+ psi a few times per day, rather than be at a constant 60+ psi and 70+ psi under boost. Since there's so many DSM 450s on ebay, I'll def go that way. This is an interesting way to increase your current injector's max whp limit, a cheap fmu wouldn't be all that bad. Lower idle fuel pressure to 30ish, and you won't see insane pressures during boost either.
As others have now posted *correctly* that 240cc injectors really can't do much more than 175whp (at 42psi) if you want anything below 13:1 AFR's, and that maybe, just maybe, the first two posters can think it through that an FMU's rising rate is predictable, then they can understand how you could mix crome and an fmu. After all, an FMU is just a heavy-duty FPR, except the OEM fpr is 1:1 where the FMU is >2:1 in boost, depending on the brand/adjustability. That bearing in mind, the FMU will allow the fuel pump to opperate like normal, and then kick it in the nuts only during full boost. IMO thats really the only issue here, but OEM pumps don't fail all that often, at least compaired to Walbro pumps.
Anyways, very little driving around here is start/stop, so most people wouldn't be boosting every 10 seconds. I would imagine that if my brother's integra pump lasted as long as it did, I could imagine that it is probably better to have the pump see 90+ psi a few times per day, rather than be at a constant 60+ psi and 70+ psi under boost. Since there's so many DSM 450s on ebay, I'll def go that way. This is an interesting way to increase your current injector's max whp limit, a cheap fmu wouldn't be all that bad. Lower idle fuel pressure to 30ish, and you won't see insane pressures during boost either.
