LS1 injectors to LT1
LS1 injectors to LT1 This is just for hypothesis right now.But humor me.
I know this:
LS1 FP is ~58 psi to LT1's 43.
LS1 stock injectors flow #28 lbs at 58 PSI. Less at 43, obviously.
LT1 stockers are right around 24 lbs @ 43 PSI.
Supposing an adjustable FPR were used, and pressure increased to say, 60 PSI, wouldnt the LS1 injectors be a decent upgrade if one wanted to decrease the duty cycle of their injectors?
I know this:
LS1 FP is ~58 psi to LT1's 43.
LS1 stock injectors flow #28 lbs at 58 PSI. Less at 43, obviously.
LT1 stockers are right around 24 lbs @ 43 PSI.
Supposing an adjustable FPR were used, and pressure increased to say, 60 PSI, wouldnt the LS1 injectors be a decent upgrade if one wanted to decrease the duty cycle of their injectors?
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From: Decatur, TN (N-W of Athens)
93's run 22# injectors. If you wanted better ionization, I'm sure the LS1's would do that. Just installing my 24# (around 25.5 since ford uses like 35psi) SVO, which ionize fuel very efficiently, I noticed considerable response time.
As Buff said, you do need to make sure your car is upgraded sufficiently to handle it. If you put them in and left it @ 43psi, I think you'd be fine.
The max I'd run the stock pump @ would be 55psi. Which they'd then flow around 26-27. If you have cam and heads, LTs and good exhaust, I'm sure that'd be fine. I found a site with AFRP for $65 (but that's here in the states).
As Buff said, you do need to make sure your car is upgraded sufficiently to handle it. If you put them in and left it @ 43psi, I think you'd be fine.
The max I'd run the stock pump @ would be 55psi. Which they'd then flow around 26-27. If you have cam and heads, LTs and good exhaust, I'm sure that'd be fine. I found a site with AFRP for $65 (but that's here in the states).
A couple of years ago, SLP was running a "special" in the LT-1 section of their catalog, and it was on LS-1 injectors. They said they were fine as a replacement for the OE LT-1 parts. They were selling them for $99 a set. I bought a set but haven't tried them yet, as my OE LT-1s still seem to be OK.
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1. Upping the fuel pressure won't do anything unless you tune the pcm for it. Otherwise it will just change the fuel trims.
2. Larger injectors will dump fuel unless, again, the pcm is tuned for them.
3. You won't see any hp increase by dumping more fuel even if you're tuned for it, unless you need it. (i.e. cam, heads, nitrous etc.)
In summary, don't upgrade the fuel system unless you have to. Don't use an AFPR as it's garbage. No matter what, get a tune.
2. Larger injectors will dump fuel unless, again, the pcm is tuned for them.
3. You won't see any hp increase by dumping more fuel even if you're tuned for it, unless you need it. (i.e. cam, heads, nitrous etc.)
In summary, don't upgrade the fuel system unless you have to. Don't use an AFPR as it's garbage. No matter what, get a tune.
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I bought a set of those SLP injectors, and decided not to use them. Sold them to by buddy who needed stock injectors. They did not fit very well. No matter what I did, the injector would not seat in the rail of the intake. The slot for the injector clip is in a different position and does not let the injector seat right in the intake or rail. Just my experience. I use 24 lb SVO's. 93 by the way.
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From: Decatur, TN (N-W of Athens)
Originally Posted by rkinney
I bought a set of those SLP injectors, and decided not to use them. Sold them to by buddy who needed stock injectors. They did not fit very well. No matter what I did, the injector would not seat in the rail of the intake. The slot for the injector clip is in a different position and does not let the injector seat right in the intake or rail. Just my experience. I use 24 lb SVO's. 93 by the way.
Originally Posted by buffman
^^ that's because IIRC you have to do some minor grinding to extend the groove on the injector to allow the stock clip to fit..
Originally Posted by Seawolf06
3. You won't see any hp increase by dumping more fuel even if you're tuned for it, unless you need it. (i.e. cam, heads, nitrous etc.)
In summary, don't upgrade the fuel system unless you have to. Don't use an AFPR as it's garbage. No matter what, get a tune.
In summary, don't upgrade the fuel system unless you have to. Don't use an AFPR as it's garbage. No matter what, get a tune.
My 91 was a 350 TPI SD car, and I installed an AFPR on it and cranked it up to around 53-55PSI and it increased my throttle response and power with out a tune. Why would that not do the same for at least the 92-93 LT1s?
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From: LT1 land...the "409" of the 90s!
they are pretty much a drop in save fitting the clip. No programing needed. I have installed a few sets and IMHO they idled better then the SVO injecters and performance was fine 
I'm not sure how the TPI computer calculates and adjusts for the fuel pressure, but what I do know is that if you simply crank up the fuel pressure on the LT1, the computer will simply lower the pulse width on the injector over time which just causes it to spray less. This negates the increase in fuel pressure.
If the SVO's you're talking about were 24# then you probably wouldn't notice it dumping any more fuel. If they were brand new and your stock injectors were dirty, that would help out a lot.
If the SVO's you're talking about were 24# then you probably wouldn't notice it dumping any more fuel. If they were brand new and your stock injectors were dirty, that would help out a lot.
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From: Decatur, TN (N-W of Athens)
Originally Posted by seawolf06
If the SVO's you're talking about were 24# then you probably wouldn't notice it dumping any more fuel. If they were brand new and your stock injectors were dirty, that would help out a lot.
