Guys with 408s and spray please come in...
Thread Starter
TECH Enthusiast
Joined: Dec 2002
Posts: 736
Likes: 0
From: Chattanooga,TN
I ran 28* N/A. I went down to 16* just for tuning/safety sake on juice, and have since ramped it up to 20* now that I'm comfortable with the AFR it's running on gas. I am about to install some type of aftermarket timing control device because pulling a bunch of timing turns my car into a turd N/A.
On 16* of timing and 3900lb raceweight, I went a measily 123mph. On a 100 shot I picked up 9mph, only spraying 2-4th, and my car goes over 50mph in 1st lol. I started a thread about timing loss + N/A runs and have come to the conclusion that I was loosing over 50rwhp dropping 12* of timing.
I believe if your tune is good and leaning on the rich side, you could run a 200 shot on pump gas easily. My AFR is 11.2-11.0:1 depending on bottle pressure. Just make sure you use colder plugs than TR6's. If you're realling leaning toward pump gas, and want a little extra insurance, have them throw in a bit bigger cam and run the compression no more than 11:1. I have a relatively small cam (242/246), quite a bit of compression (11.5:1), and get away with it.
On 16* of timing and 3900lb raceweight, I went a measily 123mph. On a 100 shot I picked up 9mph, only spraying 2-4th, and my car goes over 50mph in 1st lol. I started a thread about timing loss + N/A runs and have come to the conclusion that I was loosing over 50rwhp dropping 12* of timing.
I believe if your tune is good and leaning on the rich side, you could run a 200 shot on pump gas easily. My AFR is 11.2-11.0:1 depending on bottle pressure. Just make sure you use colder plugs than TR6's. If you're realling leaning toward pump gas, and want a little extra insurance, have them throw in a bit bigger cam and run the compression no more than 11:1. I have a relatively small cam (242/246), quite a bit of compression (11.5:1), and get away with it.
Rick at Synergy is going to spec my cam so I'm sure it won't be as big as yours. My compression will be the same as yours though at 11.5:1 with a 72 cc CB and 1 cc dome piston. So I may be okay but I'm probably going to use the WCCH L92s which can have a bigger 75 cc chamber so I could lower my compression if needed.
I have a timing tuner and you can flip a switch to pull timing for your nitrous but I can't remember how much be cause I haven't used in a while. I'm like you though I want the best of both NA and NO2. Right now since I don't have my timing tuner set up I'm running a NO2 tune so NA is a little off.
I want a timing tuner that will only pull timing when the spray is ON, not when the spray is armed. When I have my 1st gear lockout on, and not spraying 1st, I want it to run 28*. When the gas comes on in 2nd, I want it to knock down the timing.
I ran 28* N/A. I went down to 16* just for tuning/safety sake on juice, and have since ramped it up to 20* now that I'm comfortable with the AFR it's running on gas. I am about to install some type of aftermarket timing control device because pulling a bunch of timing turns my car into a turd N/A.
On 16* of timing and 3900lb raceweight, I went a measily 123mph. On a 100 shot I picked up 9mph, only spraying 2-4th, and my car goes over 50mph in 1st lol. I started a thread about timing loss + N/A runs and have come to the conclusion that I was loosing over 50rwhp dropping 12* of timing.
I believe if your tune is good and leaning on the rich side, you could run a 200 shot on pump gas easily. My AFR is 11.2-11.0:1 depending on bottle pressure. Just make sure you use colder plugs than TR6's. If you're realling leaning toward pump gas, and want a little extra insurance, have them throw in a bit bigger cam and run the compression no more than 11:1. I have a relatively small cam (242/246), quite a bit of compression (11.5:1), and get away with it.
On 16* of timing and 3900lb raceweight, I went a measily 123mph. On a 100 shot I picked up 9mph, only spraying 2-4th, and my car goes over 50mph in 1st lol. I started a thread about timing loss + N/A runs and have come to the conclusion that I was loosing over 50rwhp dropping 12* of timing.
I believe if your tune is good and leaning on the rich side, you could run a 200 shot on pump gas easily. My AFR is 11.2-11.0:1 depending on bottle pressure. Just make sure you use colder plugs than TR6's. If you're realling leaning toward pump gas, and want a little extra insurance, have them throw in a bit bigger cam and run the compression no more than 11:1. I have a relatively small cam (242/246), quite a bit of compression (11.5:1), and get away with it.
Another thing now that I remember is that Brian at LME asked how much was I plan on spraying. I told him probably a 200 shot. He said that would be fine to stay there so I wouldn't have to worry about head gaskets. My head gaskets are going to be .051 thick. I didn't ask him but wouldn't he gap the rings according to the amount of spray I planned on using? Did you plan on a 300 shot from the start? Since you have GM head gaskets it doesn't appear that you have any trouble spraying bigger shot but I guess the head studs help out a good bit with that.
Rick at Synergy is going to spec my cam so I'm sure it won't be as big as yours. My compression will be the same as yours though at 11.5:1 with a 72 cc CB and 1 cc dome piston. So I may be okay but I'm probably going to use the WCCH L92s which can have a bigger 75 cc chamber so I could lower my compression if needed.
I have a timing tuner and you can flip a switch to pull timing for your nitrous but I can't remember how much be cause I haven't used in a while. I'm like you though I want the best of both NA and NO2. Right now since I don't have my timing tuner set up I'm running a NO2 tune so NA is a little off.
I have a timing tuner and you can flip a switch to pull timing for your nitrous but I can't remember how much be cause I haven't used in a while. I'm like you though I want the best of both NA and NO2. Right now since I don't have my timing tuner set up I'm running a NO2 tune so NA is a little off.
Robert
Robert, I'm not afraid of the extra weight. That means i just need to make a little extra power to make up for that weight. I have a question for you guys with 408's.
Is $8k enough to build a 408 and get the fuel system taken care of?
Is $8k enough to build a 408 and get the fuel system taken care of?
Thread Starter
TECH Enthusiast
Joined: Dec 2002
Posts: 736
Likes: 0
From: Chattanooga,TN
What kind of mods do you have now?
I personaly prefer the advantages of having a dedicated fuel system in the car. With the dedicated I run C-16 and 93 in the stock gas tank. You will only unes small amounts of fuel from the dedicated so it will last longer than the nitrous bottle will. By using the C-16 it will help aid in detonation as well as illiminate the possibility of getting methonal cut fuel from the gas pump that may swell the fuel plunger on the fuel solenoid.
We use to build alot of dedicated using JR dragster fuel sells and inline fuel pumps and regulaters. That is why WE designed the all in one dedicated. Our all in one dedicated have a walboro fuel pump located in the cell. It comes with a aeromotive regulater that you can adjust for high or low fuel pressure. The system comes with all the hoses, fittings, wiring relay and diagram. The tank is fully assembled and you simply just bolt it in. The quality of our dedicated is yet to be matched.
Take a minute and check them out. We keep them in stock and on the shelf most of the time....
http://www.nitrousoutlet.com/catalog...del=73&dept=11
Another option would be to upgrade your current fuel system to dual intake pumps. Let me know if I can be of any help to you. Just shoot me a pm..
Dave
We use to build alot of dedicated using JR dragster fuel sells and inline fuel pumps and regulaters. That is why WE designed the all in one dedicated. Our all in one dedicated have a walboro fuel pump located in the cell. It comes with a aeromotive regulater that you can adjust for high or low fuel pressure. The system comes with all the hoses, fittings, wiring relay and diagram. The tank is fully assembled and you simply just bolt it in. The quality of our dedicated is yet to be matched.
Take a minute and check them out. We keep them in stock and on the shelf most of the time....
http://www.nitrousoutlet.com/catalog...del=73&dept=11
Another option would be to upgrade your current fuel system to dual intake pumps. Let me know if I can be of any help to you. Just shoot me a pm..
Dave
i had a question might be a dumb one but ..
with a dedicated fuel system .. will the fuel sell suply fuel to the rails and all injectors? or just the the fuel solonid ?
im wondering if this would be the best way for my rx7 project ..also u would have to upgrade stock injectors right ? even if u run c16 gas during the nitrous use ?
with a dedicated fuel system .. will the fuel sell suply fuel to the rails and all injectors? or just the the fuel solonid ?
im wondering if this would be the best way for my rx7 project ..also u would have to upgrade stock injectors right ? even if u run c16 gas during the nitrous use ?
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Brett Foote Thread Starter
TECH Enthusiast
Joined: Dec 2002
Posts: 736
Likes: 0
From: Chattanooga,TN
Originally Posted by randomnine7
im wondering if this would be the best way for my rx7 project ..also u would have to upgrade stock injectors right ? even if u run c16 gas during the nitrous use ?
its a full bolton forged 347 with ms4 fast 90 and prc heads ///
im sure i would max out the injectors on motor power and im trying to run a 3 stage 300 shot .. 150 plate kit and 2 smaller 75 dry shots ..
im not sure on wich to go with dedicated kit or upgrade full fuel system .. not just the injectors as im trying to do .
im sure i would max out the injectors on motor power and im trying to run a 3 stage 300 shot .. 150 plate kit and 2 smaller 75 dry shots ..
im not sure on wich to go with dedicated kit or upgrade full fuel system .. not just the injectors as im trying to do .
its a full bolton forged 347 with ms4 fast 90 and prc heads ///
im sure i would max out the injectors on motor power and im trying to run a 3 stage 300 shot .. 150 plate kit and 2 smaller 75 dry shots ..
im not sure on wich to go with dedicated kit or upgrade full fuel system .. not just the injectors as im trying to do .
im sure i would max out the injectors on motor power and im trying to run a 3 stage 300 shot .. 150 plate kit and 2 smaller 75 dry shots ..
im not sure on wich to go with dedicated kit or upgrade full fuel system .. not just the injectors as im trying to do .
Robert
Robert
