check out this plug...
#42
Race your car!
iTrader: (50)
Plug in the first pie I would not change the jet if you have running off a standalone with its own fuel pressure regular, I'd start dropping fuel pressure, unt you're at the limit of that, then change the jet. That's me, I like to run a bigger jet with less pressure, less risk of one clogging.
#43
9 Second Club
iTrader: (5)
Get it around 12.0 and it will run ALOT better.
With 88n jet in it your getting up there where running it rich will hurt it fast.
Stop making 1/4 mile hits until you get the tune closer.
It's real rich and has no timing on the plug yet.
I would go down to 44f and make 1/8th mile pass, pull plug.
With 88n jet in it your getting up there where running it rich will hurt it fast.
Stop making 1/4 mile hits until you get the tune closer.
It's real rich and has no timing on the plug yet.
I would go down to 44f and make 1/8th mile pass, pull plug.
#46
9 Second Club
iTrader: (21)
Get it around 12.0 and it will run ALOT better.
With 88n jet in it your getting up there where running it rich will hurt it fast.
Stop making 1/4 mile hits until you get the tune closer.
It's real rich and has no timing on the plug yet.
I would go down to 44f and make 1/8th mile pass, pull plug.
With 88n jet in it your getting up there where running it rich will hurt it fast.
Stop making 1/4 mile hits until you get the tune closer.
It's real rich and has no timing on the plug yet.
I would go down to 44f and make 1/8th mile pass, pull plug.
#50
Get it around 12.0 and it will run ALOT better.
With 88n jet in it your getting up there where running it rich will hurt it fast.
Stop making 1/4 mile hits until you get the tune closer.
It's real rich and has no timing on the plug yet.
I would go down to 44f and make 1/8th mile pass, pull plug.
With 88n jet in it your getting up there where running it rich will hurt it fast.
Stop making 1/4 mile hits until you get the tune closer.
It's real rich and has no timing on the plug yet.
I would go down to 44f and make 1/8th mile pass, pull plug.
#51
Plug in the first pie I would not change the jet if you have running off a standalone with its own fuel pressure regular, I'd start dropping fuel pressure, unt you're at the limit of that, then change the jet. That's me, I like to run a bigger jet with less pressure, less risk of one clogging.
#52
TECH Enthusiast
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Join Date: May 2009
Location: Iceland
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so, I last nite I created a spreadsheet based on nitrous/fuel pressures, jetting, and known data from testing my plate. I set up the spreadsheet so I could vary all pressures and jetting and see a resulting relative AFR for the given nitrous/fuel.
Knowing that the 78/44 combo for my car resulted in a reasonable AFR of 11.4, I extrapolated the following data:
some of these combos will require a 1 or 2 psi drop in FP to achieve roughly 11.8 AFR:
I'm going on Sat and test a few of these.
If you have tested any of these combos and can confirm them, post up.
50 35/19
100 52/29
150 62/35
200 78/44
225 82/46
250 88/49
300 93/52
325 99/56
350 110/62
Knowing that the 78/44 combo for my car resulted in a reasonable AFR of 11.4, I extrapolated the following data:
some of these combos will require a 1 or 2 psi drop in FP to achieve roughly 11.8 AFR:
I'm going on Sat and test a few of these.
If you have tested any of these combos and can confirm them, post up.
50 35/19
100 52/29
150 62/35
200 78/44
225 82/46
250 88/49
300 93/52
325 99/56
350 110/62
picked up 13-14mph on 17 degree timing
44F was pig rich in my combo whith the 78N jet
but Great Threat BTW...
baezi
Last edited by baezi z06; 04-29-2012 at 08:20 AM.
#54
#55
10 Second Club
iTrader: (10)
6.60@105.
1.55 60'
4.36 330'
Dismal at best. I will speak of my first experience with nitrous.
I didn't get my two step hooked up which has a nitrous interrupt on it so that I can have my window switch set at the rpm I have my two step at so when the transbrake releases it is spraying instantly.
So I was leaving on the transbrake, but I was leaving with the stall's flash maxed out on motor so it was a turd with no timing just barely climbing even 100rpm, then when it finally hit the rpm window(250' out) it was like a mule kicking me in the *****.
I had a backfire on the return road on the last pass of the night(I made 3 passes)
And I automatically assumed I had nicked a strap. I got back to the pits (I coast to the ticket booth, then fire it back up get some speed going then cut it off and coast) and I popped the hood and was going to let it cool off for a while since I had forgotten my gloves and burnt my hands 20x already getting the first two sets out.
Well there was a huge commotion about 1 minute after that as racers from the LS1 camp were accused of cheating and using traction control and/or slew and riding the dots which is illegal in RS275. This went on for some time and when they called them back to the lanes I forgot all about my car and it sat till I had to leave.
Well it backfired again on the way home(I live 6 miles from the track) and I assumed again that I had gotten a plug strap.
I was too tired to check last night, but again I assumed I had gotten a strap and if I did get one I figured it to be #6 as that is carters hottest hole and me and him both pull from the rail.
Well I was wrong. All straps are accounted for and I now see why everyone HATES MSD wires. My terminal connector on the #1 plug stayed stuck to the plug when I pulled the wire off.
I'm gonna guess that was the source of the backfire.
I will post plug pictures soon.
I only have the one set I can take pictures of.
I was using the fuel jet on the N20 outlet card which was 62N and 38F 58psi of pressure and 20 degrees timing on 93 octane -7 heat range plug.
They are autolite plugs so the strap isn't going to look the same as a NGK does. These are the only plugs I could find local in time and I and other nitrous users at the track had a harder time gauging the heat on the strap with these.
I am going to mix some kind of race gas 50/50 with my 93 next time and most likely take at least 2 degrees of timing away.
5 out of my 8 plugs had the timing mark right in or before the bend, but 3 others were right at the bend or slightly past it.
We pulled 9 degrees total for the 150 from my motor tune-up.
1.55 60'
4.36 330'
Dismal at best. I will speak of my first experience with nitrous.
I didn't get my two step hooked up which has a nitrous interrupt on it so that I can have my window switch set at the rpm I have my two step at so when the transbrake releases it is spraying instantly.
So I was leaving on the transbrake, but I was leaving with the stall's flash maxed out on motor so it was a turd with no timing just barely climbing even 100rpm, then when it finally hit the rpm window(250' out) it was like a mule kicking me in the *****.
I had a backfire on the return road on the last pass of the night(I made 3 passes)
And I automatically assumed I had nicked a strap. I got back to the pits (I coast to the ticket booth, then fire it back up get some speed going then cut it off and coast) and I popped the hood and was going to let it cool off for a while since I had forgotten my gloves and burnt my hands 20x already getting the first two sets out.
Well there was a huge commotion about 1 minute after that as racers from the LS1 camp were accused of cheating and using traction control and/or slew and riding the dots which is illegal in RS275. This went on for some time and when they called them back to the lanes I forgot all about my car and it sat till I had to leave.
Well it backfired again on the way home(I live 6 miles from the track) and I assumed again that I had gotten a plug strap.
I was too tired to check last night, but again I assumed I had gotten a strap and if I did get one I figured it to be #6 as that is carters hottest hole and me and him both pull from the rail.
Well I was wrong. All straps are accounted for and I now see why everyone HATES MSD wires. My terminal connector on the #1 plug stayed stuck to the plug when I pulled the wire off.
I'm gonna guess that was the source of the backfire.
I will post plug pictures soon.
I only have the one set I can take pictures of.
I was using the fuel jet on the N20 outlet card which was 62N and 38F 58psi of pressure and 20 degrees timing on 93 octane -7 heat range plug.
They are autolite plugs so the strap isn't going to look the same as a NGK does. These are the only plugs I could find local in time and I and other nitrous users at the track had a harder time gauging the heat on the strap with these.
I am going to mix some kind of race gas 50/50 with my 93 next time and most likely take at least 2 degrees of timing away.
5 out of my 8 plugs had the timing mark right in or before the bend, but 3 others were right at the bend or slightly past it.
We pulled 9 degrees total for the 150 from my motor tune-up.
#57
9 Second Club
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Join Date: Oct 2007
Location: South Ga
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As far as cutting the plug go. Get a 32 tooth hacksaw blade, chuck the actual plug in a battery powered drill on high, have someone hold the hacksaw while you spin the plug on the blade. Works like a charm, thank to dave at n20!
Now your car runs 6.3 on motor correct?
#58
Based on the N/F ratios I've seen recently, I would calculate about a 32 jet for the 62 at 58psi.