LT1-LT4 Modifications 1993-97 Gen II Small Block V8

350 tune port queston??

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Old 06-10-2009, 11:43 AM
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Default 350 tune port queston??

in stock for what shot of nitrous can a tune port spray safely on stock timing?
Old 06-10-2009, 11:59 AM
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Originally Posted by greyghost4x4
in stock for what shot of nitrous can a tune port spray safely on stock timing?
100 wet shot w/ 100 octane maybe...
Old 06-10-2009, 12:06 PM
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cant seem to find what plug to run in one either... im doin research for a friend of mine that doesnt have access to the net and i know nothing about the tune port motors..

1)will the stock fuel system be ok with a 100 to 125 wet?
2)what plug should be ran? i know cooler than stock but cant find a part number anywhere...
3)what timing to start off at?
Old 06-10-2009, 12:08 PM
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1) I would definitely install a Racetronix fuel pump kit that utilizes a Walbro 255lph fuel pump.
2) I would install NGK TR6 plugs gapped at .035
3) I think total timing is set to 26 degrees advanced, stock, but check on that...
Old 06-10-2009, 12:16 PM
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i thoght the tr6 plugs were for the ls enines? guess they work in both.
Old 06-10-2009, 03:02 PM
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I ran tr6's on my bolton/n2o setup and still run them on the new n/a high comp motor
Old 06-10-2009, 05:26 PM
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I have TR6's in my lt currently......As for the TPI...go to TR6's pull 4 degrees base timing out and spray 100-150 wet through it. And enjoy, as long as it ain't the wimpy 305 you'll have a blast. Come to think of it, a buddy ran a 250 shot through a stock bottom-end 305 and it survived until he sold the car But I don't recommend trying that. Really cool to see a 305 RS thirdgen running 11.5's though...
Old 06-10-2009, 06:09 PM
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you can run a 125 shot. My buudy has a 1le 5sp 305 car that has a 125wet on it w/ no problems. It runs mid high 12's all day. Tr6's are not lsx specific, that number is just for heat range reference and is a good heat range for that size of shot. Tr5's are hotter, tr6's are colder, tr7's even colder yet....
Old 06-10-2009, 10:15 PM
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My TPI cars had 150 on them using autolite 25s gapped @ .030
i did use a 150 on my Lb9 5 spd and that was good for a little while till i went down to 100......
Old 06-11-2009, 08:59 AM
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thanks guys this is some good info... i've never delt with a TPI so i need the help. i'm sure i'll have some more q's by the time i get this nitrous install done..

pull fuel from passenger side fuel rail?
Old 06-11-2009, 11:35 AM
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Originally Posted by ss.slp.ls1
1) I would definitely install a Racetronix fuel pump kit that utilizes a Walbro 255lph fuel pump.
2) I would install NGK TR6 plugs gapped at .035
3) I think total timing is set to 26 degrees advanced, stock, but check on that...
Now that I think about it...disregard #3 above.
I think stock timing on a TPI is set to 6* advanced. Pretty sure that's what I set my buddies car to initially with a timing light for the initial start up. Then he got it tuned.

Last edited by ss.slp.ls1; 06-11-2009 at 11:51 AM.
Old 06-11-2009, 11:48 AM
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is it a Vette 350 (4bolt main)>?
Old 06-11-2009, 01:10 PM
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Originally Posted by ss.slp.ls1
Now that I think about it...disregard #3 above.
I think stock timing on a TPI is set to 6* advanced. Pretty sure that's what I set my buddies car to initially with a timing light for the initial start up. Then he got it tuned.
Yeah the TPI's have a goofy timing pointer. It ends up pointing at 0* factory (I believe) then if you bump it up to 6* it wakes up ALOT. I would go with a 0* timing running the tr6 or tr7 and then run a 150 trough it and see what happens.....Worst case scenario is you'll be replacing a $1500 Long block from *insert parts store name here*. Just my .02
Old 06-11-2009, 02:07 PM
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Originally Posted by H8Mac
is it a Vette 350 (4bolt main)>?
i haven't a clue... its 80somethin model GTA? looks like a knightrider car but w/gold wheels.. he's restored the car to about 80% so far and wants to spray for some reason.. so i figured least i could do is try and find out how he could spray the car safely



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