nitrous back fire
nitrous back fire ok i changed my pluges from the **72a extended plug to the **71a short plug...ran my car at the track. on the first run i went 6.04 @ 113.90 every thing felt normal...second run i hit the throttle and the wheels started to come up and boom boom boom.n20 back fire caught the fome on fire. checked 2 plugs thay looked ok.what do you guys think........andis it posible to blow up the map sencer.and car ist running right, right now
Teching In
Joined: Mar 2008
Posts: 26
Likes: 0
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
Teching In
Joined: Mar 2008
Posts: 26
Likes: 0
IDK his jet sizes, fp or timing
forged/built 383 lt1, afr cnc heads and a vic EFI manifold. 4 hole throttle body, TH 400 trans, left off idle. IDK stall either.
no didnt pull plugs yet. I would be doing it now if it was me but IDK when he has to get up. LOL
Hope it's not hurt Mike.
Like I said its hard to help with no information.
Did you go from NGK's to Autolites?
From the video it sounds like you spraying it at to low of an RPM with a tight converter and its just loading up and backfiring... almost sounded like it was bogging down which will = backfire everytime.
Without any info my shot in the dark fix would be to put some timing in it down low, it will help the converter flash and help burn off any extra fuel.
383 lt1 afr 210 heads, vic,4150 tbody, th400,3800 stall,370 gear,nx gemini 6 plate,and a progressive......n20 comes on at 2900 rpm at 60% and ramps up to 300 shot in .05 seconds.......im goint to pull all the pluggs and check them,and make shure my stand alone pump is working to. and thay are ngk
Too low of a rpm to be spraying. THAT "might" be the reason for the backfire. 
With a auto it is just flashing the converter so there is no real load on the motor (almost like banging the nitrous in neutral). Now if the converter is tight and the timing is LOW with a rich tune up it could bog the motor enough for it to pop.
Check rockers and springs also.
Where's yours set at now? I feel a little safer with my window set at 3400 rpms.