J&S safe guard
03-11-2005, 01:10 PM
#43
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Originally Posted by IceY2K1
I think that will work GREAT for around 300whp with or without the Z32 MAF, but you'll need to use a FMU to pump a bit more fuel through those 370cc injectors to keep safer duty cycles. See how that goes and what hp level that supports.
(370cc/10.5)*.8/.6*6*.85 = ~240whp@80%DC
(370cc/10.5)*1/.6*6*.85 = ~300whp@100%DC
I'd have no qualms about running the J&S and stock ECU with regards to timing.
(370cc/10.5)*.8/.6*6*.85 = ~240whp@80%DC
(370cc/10.5)*1/.6*6*.85 = ~300whp@100%DC
I'd have no qualms about running the J&S and stock ECU with regards to timing.
messing with that equation makes me worried that even with my .4 bar wastegate spring I will be close to or out of the range of the stock injectors.
(240/10.5)*.9/.6*6*.85 = 175whp@90%DC
or, maxed out and a less conservative BSFC
(240/10.5)*1/.55*6*.85 = 211whp@100%DC
but I will be using an FMU. Lets say a 8:1 disk with my 5psi of boost which is about 65psi of fuel pressure through the stock injectors which effectively makes them 273cc injectors, so
(273/10.5)*.9/.6*6*.85 = 198whp@90%DC
or maxed out and a less conservaticve BSFC
(273/10.5)*1/.55*6*.85 = 241whp@100%Dc
I figured on a .4 bar spring (5.8psi) which will probably be 5psi after the intercooler I would be around 260-270 whp. So how in the heck is this gonna work foe me. I have an FMU and SAFC. Am I doing something wrong with these equations or something? I thought I would be safe up till 290 or 300 whp on the stock injectors and FMU.
03-11-2005, 01:14 PM
#44
Basically, injector type, injector size/ECU programmed pulse-width, base fuel pressure, fuel system type, injector atomization/spray pattern, yada yada are different, so there isn't a XXXcc size limit via MAF conditioning.
However, there is a minimum MAF voltage point at which an eManage or similar piggy-back can not go below because the stock ECU will think the MAF has crapped out and either go into limp mode or idle bad. Therefore, TS/JWT can be used.
However, there is a minimum MAF voltage point at which an eManage or similar piggy-back can not go below because the stock ECU will think the MAF has crapped out and either go into limp mode or idle bad. Therefore, TS/JWT can be used.
03-11-2005, 01:25 PM
#45
No, however...
1)Base fuel pressure is 34psi, why are you using 50psi?
2)Stockers vary from 240cc-260cc, IIRC, so some have more room to work with.
3)People run more then 65psi of fuel pressure.
4)SC people probably see closer to 0.5 BSFC, so more room, but moderate-to-high psi turbo peeps should stick to 0.6 IMHO.
You said you were running 370cc injectors before at 9-10psi, however if you intend to run the 240cc-260cc injectors, I'd bump up the fuel pressure using a bigger disc ratio.
1)Base fuel pressure is 34psi, why are you using 50psi?
2)Stockers vary from 240cc-260cc, IIRC, so some have more room to work with.
3)People run more then 65psi of fuel pressure.
4)SC people probably see closer to 0.5 BSFC, so more room, but moderate-to-high psi turbo peeps should stick to 0.6 IMHO.
You said you were running 370cc injectors before at 9-10psi, however if you intend to run the 240cc-260cc injectors, I'd bump up the fuel pressure using a bigger disc ratio.
Originally Posted by I30tMikeD
messing with that equation makes me worried that even with my .4 bar wastegate spring I will be close to or out of the range of the stock injectors.
(240/10.5)*.9/.6*6*.85 = 175whp@90%DC
or, maxed out and a less conservative BSFC
(240/10.5)*1/.55*6*.85 = 211whp@100%DC
but I will be using an FMU. Lets say a 8:1 disk with my 5psi of boost which is about 65psi of fuel pressure through the stock injectors which effectively makes them 273cc injectors, so
(273/10.5)*.9/.6*6*.85 = 198whp@90%DC
or maxed out and a less conservaticve BSFC
(273/10.5)*1/.55*6*.85 = 241whp@100%Dc
I figured on a .4 bar spring (5.8psi) which will probably be 5psi after the intercooler I would be around 260-270 whp. So how in the heck is this gonna work foe me. I have an FMU and SAFC. Am I doing something wrong with these equations or something? I thought I would be safe up till 290 or 300 whp on the stock injectors and FMU.
(240/10.5)*.9/.6*6*.85 = 175whp@90%DC
or, maxed out and a less conservative BSFC
(240/10.5)*1/.55*6*.85 = 211whp@100%DC
but I will be using an FMU. Lets say a 8:1 disk with my 5psi of boost which is about 65psi of fuel pressure through the stock injectors which effectively makes them 273cc injectors, so
(273/10.5)*.9/.6*6*.85 = 198whp@90%DC
or maxed out and a less conservaticve BSFC
(273/10.5)*1/.55*6*.85 = 241whp@100%Dc
I figured on a .4 bar spring (5.8psi) which will probably be 5psi after the intercooler I would be around 260-270 whp. So how in the heck is this gonna work foe me. I have an FMU and SAFC. Am I doing something wrong with these equations or something? I thought I would be safe up till 290 or 300 whp on the stock injectors and FMU.
03-12-2005, 07:58 PM
#47
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Posts: 6,451
why do you guys waste your money on that useless SAFC?
Get an emanage for what $300 plus shipping, the injector harness so you can control your larger injectors and call it the day. If I was to get a JWT ECU I would just get the extended rev limiter to 7500K, that extra cushion so you dont have to stare at the tach when you are running someone.
Get an emanage for what $300 plus shipping, the injector harness so you can control your larger injectors and call it the day. If I was to get a JWT ECU I would just get the extended rev limiter to 7500K, that extra cushion so you dont have to stare at the tach when you are running someone.
subscribing!
03-14-2005, 07:41 PM
#50
Actually, double checking with my calculator shows at a peak 65psi of fuel pressure, that would make 240cc-->~293cc.
So,
(293/10.5)*.9/.6*6*.85 = ~213whp@90%DC
(293/10.5)/.55*6*.85 = ~258whp@100%DC and 0.55 BSFC
So,
(293/10.5)*.9/.6*6*.85 = ~213whp@90%DC
(293/10.5)/.55*6*.85 = ~258whp@100%DC and 0.55 BSFC
Originally Posted by I30tMikeD
but I will be using an FMU. Lets say a 8:1 disk with my 5psi of boost which is about 65psi of fuel pressure through the stock injectors which effectively makes them 273cc injectors, so
(273/10.5)*.9/.6*6*.85 = 198whp@90%DC
or maxed out and a less conservaticve BSFC
(273/10.5)*1/.55*6*.85 = 241whp@100%Dc
(273/10.5)*.9/.6*6*.85 = 198whp@90%DC
or maxed out and a less conservaticve BSFC
(273/10.5)*1/.55*6*.85 = 241whp@100%Dc
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