Even the 28lb's are running it close on some engines running the 125hp dry jets, but some are fine also.
NOS , Injector question?
Thread Starter
Drifting
Joined: Oct 2002
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From: Georgetown SC
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NOS , Injector question?
I'm shooting a 100 dry shot with stock injectors on a 2000. Are stock injectors ok? what if I went to a 125 shot? If not what size injectors should I go to and where should I buy them from?
Le Mans Master
Joined: Aug 2002
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From: Houston TX
St. Jude Donor '11
'99's and '00's had the smaller 26# injectors. All other years have 28#'ers. I'd say at a 100 shot you are maxing out, or close to maxing out the stock injetors but only an autotap/HP Tuner data log would show that.
Without datalogging/dyno'ing you are rolling the dice going any higher IMO.
Without datalogging/dyno'ing you are rolling the dice going any higher IMO.
Le Mans Master
Joined: Aug 2002
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From: Houston TX
St. Jude Donor '11
The problem now becomes cost. In order to spray over 100 dry you need new injectors and a tune to go with them. If you're going to do that I'd say you may as well go w/ 42#ers which is more than you need to spray 125 but you may as well plan ahead. Between the cost of injectors and a tune you would be better off buying the parts to convert the 5177 to a wet kit from a cost perspective. It would be much cheaper. There are guys spraying over 200 dry with big injectors and a nitrous tune so it is definitely possible but it is cost prohibitive IMO.
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Drifting
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From: Georgetown SC
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Should I get it tuned with just a 100 shot? I'm not planning on using it alot just at the track some of the time. For most of my bracket racing I will just run on motor.
Le Mans Master
Joined: Aug 2002
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From: Houston TX
St. Jude Donor '11
Originally Posted by Blue Flames
Should I get it tuned with just a 100 shot? I'm not planning on using it alot just at the track some of the time. For most of my bracket racing I will just run on motor.
Perhaps someone else running a dry kit can comment on their injector size and duty cycle and horsepower for a particular shot from a datalogged dyno run which would give us a more accurate BSFC # for a dry nitrous LS1.
Note that RC rates static flow of injetors at 43 PSIG if you decide to play with the BSFC worksheet so at 60 PSIG a 26.6# injector would be 22.5# and a 28.8# injector would be 26.7#.
This worksheet is what made me shy away from a dry kit.
Last edited by 5 Liter Eater; Jan 4, 2005 at 11:57 AM.
Le Mans Master
Joined: Aug 2002
Posts: 8,472
Likes: 38
From: Houston TX
St. Jude Donor '11
I tried playing w/ the BSFC worksheet for a bit before I realized that we NEED to know what the duty cycle was for someone's N2O assisted pull to get the BSFC. The same would apply to calculating a NA or FI LS1's BSFC.
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From: Tacoma WA
One thing to keep in mind is that if your running a NOS brand dry kit, they rate their jets at the crank. So, a 100hp shot is really about 80hp at the rear wheels. This is one of the reasons these kits are so safe: over rated hp figures for a conservative set-up. Now if you want to run 100hp shot at the rw use dual .036 n2o jets=97.75hp (115hp at crank minus 15%), assuming it's a nos kit. Every .001 jet size increase equals a 2.5hp increase.