Double mod'ing again?
11-05-2005, 06:46 AM
#1
Double mod'ing again? I just had my engine forged/built with AFR H/C package ... bunch of other stuff. My concern is the fuel system upgrade. A year ago, I upgraded from 26# stock injectors to 28# stockers. Now, I have just upgraded again to SVO 30# injectors with a new Racetronics fuel pump ... all this in preparation to spray a 200 hit. Now, I'm being told by some the ijectors or fule pump may not allow me to go with that big a spray. 
Do you agree?
Do you agree?
11-05-2005, 01:18 PM
#2
Depends on your current injector duty cycle when running NA. If you are close to using all your injector's capacity, then you don't have the extra headroom to run a 200 shot, which needs quite a bit of fuel.
The pump is probably OK, if it's getting 13+ volts at the pump. What lines are your running, stock?
I would have gone straight to the 42's if I were planning to spray that large.
Jim
The pump is probably OK, if it's getting 13+ volts at the pump. What lines are your running, stock?
I would have gone straight to the 42's if I were planning to spray that large.
Jim
11-05-2005, 05:50 PM
#3
Well, back about 2 years ago (when I was at 335 RWHP/349 RWTQ), the 26# stockers were over-maxed at about 90% duty cycle. I upgraded to 28.8 and they seemed to be about right for my recent 360 RWHP/370 RWTQ setup.
Now, the 30# SVO's, if they were a true 30#'s, probably would be about right for me now ... numbers after all this motor work are about 400/400. Don't know exact dyno numbers yet. However, 30# SVO's are supposed to flow at 36#'s, so, I probably ought to just limit my car to 150 hit right now.
I guess since I have never driven a car on spray, I should keep it to a less-than-200-shot, anyway. Damn! I hate this paying for **** twice stuff. I don't think my engine builder knew I would be wanting to go for a 200-250 setup. I know him and he absolutely would have installed at least 42#'ers. Oh well, it's probably best to keep it at 150 for now. Just trying to do it right so I don't keep having to do **** over again.
Maybe I should just go ahead and do a DP 150 and I can upgrade that pretty easily later to a 200-250. 250 is my goal. Nitrous Dave brought up a good point. Why go with anythinhg other than a DP setup for now ... IF that's my final goal. Why spend the money for a dry kit ... knowing I'd have to spend more money later. I think I'll take his advice and just wait on the nitrous until I can do a DP 200-250. At that point, I guess changing injectors would be considered a minimal expense.
My fuel lines are stock ... what would be the advantage to going larger and what would the cost be? You've brought up a VERY good point, I think.
Now, the 30# SVO's, if they were a true 30#'s, probably would be about right for me now ... numbers after all this motor work are about 400/400. Don't know exact dyno numbers yet. However, 30# SVO's are supposed to flow at 36#'s, so, I probably ought to just limit my car to 150 hit right now.
I guess since I have never driven a car on spray, I should keep it to a less-than-200-shot, anyway. Damn! I hate this paying for **** twice stuff. I don't think my engine builder knew I would be wanting to go for a 200-250 setup. I know him and he absolutely would have installed at least 42#'ers. Oh well, it's probably best to keep it at 150 for now. Just trying to do it right so I don't keep having to do **** over again.
Maybe I should just go ahead and do a DP 150 and I can upgrade that pretty easily later to a 200-250. 250 is my goal. Nitrous Dave brought up a good point. Why go with anythinhg other than a DP setup for now ... IF that's my final goal. Why spend the money for a dry kit ... knowing I'd have to spend more money later. I think I'll take his advice and just wait on the nitrous until I can do a DP 200-250. At that point, I guess changing injectors would be considered a minimal expense.
My fuel lines are stock ... what would be the advantage to going larger and what would the cost be? You've brought up a VERY good point, I think.
11-06-2005, 08:08 AM
#5
Oh ... Are you talking about a direct port setup only? It seems like any nitrous setup would still require a lot more fuel ... putting an extra load on the injectors ... shows you how much I don't know about it.
I'll go back and re-read the stickies on the subject ... seems like I forget most of what I read ...
I'll go back and re-read the stickies on the subject ... seems like I forget most of what I read ...
11-06-2005, 03:50 PM
#7
Racetronix FP was installed when the engine was forged and built last month. I had my performance shop to do it and the SVO injectors, as well ... in preparation of a nitrous setup. A couple of folks here have stated that the Racetronix won't support a 200-250 hit, nor will the 30# SVO injectors, though. I thought it would, so, if not, here I go re-mod'ing again in the near future. Guess it will be 42# injectors and a Walbro 340 ... wish I'd known.
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11-06-2005, 03:51 PM
#8
Doin' it over, I guess. Racetronix FP was installed when the engine was forged and built last month. I had my performance shop to do it and the SVO injectors, as well ... in preparation of a nitrous setup. A couple of folks here have stated that the Racetronix won't support a 200-250 hit, nor will the 30# SVO injectors, though. I thought it would, so, if not, here I go re-mod'ing again in the near future. Guess it will be 42# injectors and a Walbro 340 ... wish I'd known. 
11-07-2005, 08:18 AM
#9
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The Racetronix kit will support around 600 RWHP out of the box. Add in a fuel rail mounted fuel pressure regulator and you'll be good to 650+ RWHP. Need more? Add in a BAP. If doing a wet shot you're injectors will be fine (as long as they are enough for the motor). If doing a dry shot, time to upgrade the injectors. 
Matt
Matt