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Discussion Starter · #1 ·
I finally started my Jeep the other day, it is a SB Chevy 415 with a 90 model TPI unit and it is sorta concerning me... After running for about 10 minutes I noticed that the headers and about 3 feet of the 2.5" exhaust were glowing orange almost back to the flowmasters.

What would cause this? The base timing is set at 8* BTDC.

Thanks
 

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Need more info. stock chip, stock injectors, what's the fuel pressure? Running in closed loop or open loop? Do you have a scanner?
How did you get 415 c.u.out of that small block ????,sounds cool !!!! <IMG SRC="smilies/biggrin.gif" border="0"> <IMG SRC="smilies/biggrin.gif" border="0">
 

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TPIJeep,
I was having the same problem with my 454 in my RV. I started messin anround with things and it turns out my carb was to rich. I dont know much about TPI systems but you may want to try leaning it down a little bit. talk to you later.
Matteo cardella <IMG SRC="smilies/smokin.gif" border="0">
 

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glowing headers and exhaust means its too lean..........i am looking into puting a tpi unit into my cruzah.........with those kind of cubes you should have a lot bigger injectors............i think the computer makes a differance too......they range from 305 cubes camaros to vettes...............
 

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In general, when you have a hot running motor there is a timing issue or a very lean condition. this one sounds like a lean condition. go to Jegs/Summit or any of the other. Tell them the setup you have including the TPI donor vehicle. They should be able to sell you some larger injectors and the chip to controll them. I think Elderbrock even does this. While your at it change your Throttle body on the front for more air flow.

Summit Injectors
 

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1962 YellowSubmarine
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<font color="yellow">Every motor I've broken in, has always got the headers glowing hot during break in. Sometimes I shut it down and let it cool, then run it again to finish the cam break in...I personally wouldn't worry about it too much - except in your case...

Like everyone said already, I think your running too lean with that kind of displacement I only have a 383 and run a 54mm TB and 24# injectors, I also have larger runners that are port matched to the plenum and manifold. Doing any/all of these mods means you'll need a custom chip too.
www.azspeed-marine.com are the guys that answered my initial questions and helped me out. They are a bit more expensive than some of the other places, but their Quality and Tech support is excellent and they seem to really know their stuff. Most of the guys on here have helped me out a time or two also, so there's a lot of support availible...It just seems to me your in the same situation I was in, A shop that "supposedly" knows fuel injection, told me the 305 set up would work fine on the 383 I was building and I listened to them...afterall they are the "experts" <IMG SRC="smilies/rolleyes.gif" border="0">...

Good Luck,
PSD</font c>
 

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Discussion Starter · #7 ·
Thanks for the info guys....I finally got in touch with the guy who burned the PROM for me, he set it up for 24# injectors and the 19#'s won't keep up. I have a set of 24#'s on the way.

Yellowsub what timing are you running with the set timing connector unplugged?

iroc-cj It's a 400 block bored 30 over with an offset ground crank running small journal 327 rods. A little clearancing here and there and you get 414.69 cubes...

Thanks for everybody's information.
 

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TPIJeep
Have you looked into burning your own proms, for a couple hundred dollars you can buy the eqipment to do your own. With your combo it might be hard to get it right having someone else do it. not only that but you can burn proms for GM TBI's also,& recoup some of your costs.
Thirdgen.org has a great right up on getting started burning proms at prom burning article
The article links you to sources for the eqipment& lists prices. ive been doing it for about 6 months & it's very easy to do, knowing what param's to change is the hard part.

[ 09-06-2001: Message edited by: iroc-cj ]
 

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1962 YellowSubmarine
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Originally posted by TPIJeep:
<STRONG>
Yellowsub what timing are you running with the set timing connector unplugged?</STRONG>
<font color="yellow">8.5 deg<font c>
 
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