FI head and engine question
#1
FI head and engine question
Ok Well Im about to put on my ATI stage III setup very soon. I have a cam in but Im swapping it for a better suited cam for this setup. Now my first question is that I am running stock heads. I really have no money to port my heads and I'm wondering what the downfall will be on me. I know It will make more power and It will help keep boost levels down but what is it going to hurt. I mean If i reach the 600 rwhp levels what happens then? Second I've heard from goldenwest and such that they have had no problems really running 9 psi on stock motors and with the stage III kit they have hit 540 rwhp levels. Now i plan on doing a rebuild ASAP because i know a stock bottomend can't last long at these levels. Now They have had no problems with heads lifting or with the blocks. Now when I do my rebuild i was onyl planning rods, pistons, stock crank, custom head gaskets, and head bolts but some have said I should do a iron block for these power levels. At what levels is my stock ls1 block going to take? I don't plan on 700 rwhp so I would think it could hold. Will my heads hold? It has me thinking that I either choose to port the heads (2 grand) or do i rebuild the motor with an iron block?(couple grand) well guys give me your input and experiences with the Ls1 and forced induction. I know Tbyrne said he was lifting heads at 540 rwhp. and i know goldenwest said they have had really no problems unless the customers have gone over 10 psi or 600 rwhp.
#2
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Re: FI head and engine question
[quote]Originally posted by Bad Habit SS:
Ok Well Im about to put on my ATI stage III setup very soon. I have a cam in but Im swapping it for a better suited cam for this setup.
Now my first question is:
I am running stock heads. I really have no money to port my heads and I'm wondering what the downfall will be on me.
I know It will make more power and It will help keep boost levels down but what is it going to hurt. I mean If i reach the 600 rwhp levels what happens then?
Second:
I've heard from goldenwest and such that they have had no problems really running 9 psi on stock motors and with the stage III kit they have hit 540 rwhp levels.
Now i plan on doing a rebuild ASAP because i know a stock bottomend can't last long at these levels.
They have had no problems with heads lifting or with the blocks. Now when I do my rebuild i was onyl planning rods, pistons, stock crank, custom head gaskets, and head bolts but some have said I should do a iron block for these power levels.
At what levels is my stock ls1 block going to take? I don't plan on 700 rwhp so I would think it could hold. Will my heads hold? It has me thinking that I either choose to port the heads (2 grand) or do i rebuild the motor with an iron block?(couple grand)
Well guys give me your input and experiences with the Ls1 and forced induction. I know Tbyrne said he was lifting heads at 540 rwhp. and i know goldenwest said they have had really no problems unless the customers have gone over 10 psi or 600 rwhp.<hr></blockquote>
Ok Well Im about to put on my ATI stage III setup very soon. I have a cam in but Im swapping it for a better suited cam for this setup.
Now my first question is:
I am running stock heads. I really have no money to port my heads and I'm wondering what the downfall will be on me.
I know It will make more power and It will help keep boost levels down but what is it going to hurt. I mean If i reach the 600 rwhp levels what happens then?
Second:
I've heard from goldenwest and such that they have had no problems really running 9 psi on stock motors and with the stage III kit they have hit 540 rwhp levels.
Now i plan on doing a rebuild ASAP because i know a stock bottomend can't last long at these levels.
They have had no problems with heads lifting or with the blocks. Now when I do my rebuild i was onyl planning rods, pistons, stock crank, custom head gaskets, and head bolts but some have said I should do a iron block for these power levels.
At what levels is my stock ls1 block going to take? I don't plan on 700 rwhp so I would think it could hold. Will my heads hold? It has me thinking that I either choose to port the heads (2 grand) or do i rebuild the motor with an iron block?(couple grand)
Well guys give me your input and experiences with the Ls1 and forced induction. I know Tbyrne said he was lifting heads at 540 rwhp. and i know goldenwest said they have had really no problems unless the customers have gone over 10 psi or 600 rwhp.<hr></blockquote>
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Re: FI head and engine question
Okay, did that so it was a little easier to read <img src="gr_stretch.gif" border="0">
[quote]I am running stock heads. I really have no money to port my heads and I'm wondering what the downfall will be on me.
I know It will make more power and It will help keep boost levels down but what is it going to hurt. I mean If i reach the 600 rwhp levels what happens then? <hr></blockquote>
The downfall is you either make less power, or run more boost/create more heat/are harder on the motor to make the same amount of power. I would choose the former.
Realistically you are not going to see 600rwhp with stock heads, esp. with the compressors offered in the LS1 kits. 450rwhp is probably more realistic.
[quote]
I've heard from goldenwest and such that they have had no problems really running 9 psi on stock motors and with the stage III kit they have hit 540 rwhp levels.
Now i plan on doing a rebuild ASAP because i know a stock bottomend can't last long at these levels.<hr></blockquote>
Go ahead and do the rebuild first then. Lower your compression and crank up the boost. You will be better off in the long run.
[quote]
I should do a iron block for these power levels.
<hr></blockquote>
What power levels? With stock heads/stock displacement and the compressors that are shipping in the kits I think that 450 possibly 500rwhp is more realistic, and the latter pretty much on the edge/maxxed out.
[quote]At what levels is my stock ls1 block going to take? <hr></blockquote>
I wouldn't worry about the block as long as your rebuild is done by a competent machinest, etc. Make sure they have LS1 experience.
Okay, just checked out the GWP setup you referenced above - I didn't realize they were fitting a D1 into the LS1 (though I guess the size is pretty similar?) If you have future blower plans I would go ahead and get that now and just pulley down. To make their quoted numbers though I am expecting head work/decent cam. I also think you are going to start levelling off from 550-600rwhp because of the intake (and possibly hit a point of diminishing returns well before that).
I don't think a blower car is a good choice when you have a tight budget. If you want to do it I would get the rebuild done first, then get the blower. Pay extra special care to the tuning.
Chris
[quote]I am running stock heads. I really have no money to port my heads and I'm wondering what the downfall will be on me.
I know It will make more power and It will help keep boost levels down but what is it going to hurt. I mean If i reach the 600 rwhp levels what happens then? <hr></blockquote>
The downfall is you either make less power, or run more boost/create more heat/are harder on the motor to make the same amount of power. I would choose the former.
Realistically you are not going to see 600rwhp with stock heads, esp. with the compressors offered in the LS1 kits. 450rwhp is probably more realistic.
[quote]
I've heard from goldenwest and such that they have had no problems really running 9 psi on stock motors and with the stage III kit they have hit 540 rwhp levels.
Now i plan on doing a rebuild ASAP because i know a stock bottomend can't last long at these levels.<hr></blockquote>
Go ahead and do the rebuild first then. Lower your compression and crank up the boost. You will be better off in the long run.
[quote]
I should do a iron block for these power levels.
<hr></blockquote>
What power levels? With stock heads/stock displacement and the compressors that are shipping in the kits I think that 450 possibly 500rwhp is more realistic, and the latter pretty much on the edge/maxxed out.
[quote]At what levels is my stock ls1 block going to take? <hr></blockquote>
I wouldn't worry about the block as long as your rebuild is done by a competent machinest, etc. Make sure they have LS1 experience.
Okay, just checked out the GWP setup you referenced above - I didn't realize they were fitting a D1 into the LS1 (though I guess the size is pretty similar?) If you have future blower plans I would go ahead and get that now and just pulley down. To make their quoted numbers though I am expecting head work/decent cam. I also think you are going to start levelling off from 550-600rwhp because of the intake (and possibly hit a point of diminishing returns well before that).
I don't think a blower car is a good choice when you have a tight budget. If you want to do it I would get the rebuild done first, then get the blower. Pay extra special care to the tuning.
Chris
#4
Re: FI head and engine question
Well the D1 compressor and the size of my intercooler is crazy... my stage III kit should easily make some awesome numbers. And the reason i went blown in I was told by my parents not to use it (i've had a bottle for a while but now its gone) and i got a SWEET deal on this setup