Author Topic: Baseline starting tips  (Read 1784 times)

Offline Chuck466

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Baseline starting tips
« on: May 04, 2022, 10:12:58 AM »
So my question is what starting point with timing do you start with on a SBC blown with mechanical injection?
2nd question what's a EGT target I'm shooting for on a SBC application?
1990 GMC S-15,  TBS HH 87-1 billet blower, SBC 410ci, Coan turbo 400 5500 stall, Mark williams 9".  3350lbs

Offline Frontenginedragsters

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Re: Baseline starting tips
« Reply #1 on: May 05, 2022, 10:59:13 AM »
Hey Chuck466:
I read your previous post.
Is it Alcohol fuel?
If it was on my dyno I would start conservative at 24* and slowly work up.

Matt
« Last Edit: May 05, 2022, 11:03:15 AM by Frontenginedragsters »
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Offline Chuck466

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Re: Baseline starting tips
« Reply #2 on: May 05, 2022, 02:50:26 PM »
Yes alcohol mechanical injection, I actually set it up at 24 but when I stalled it up on the break it wanted bang and backfire so I raised it to 28 and that stopped the back fire on the break, so 28 will be my starting point, for now.
1990 GMC S-15,  TBS HH 87-1 billet blower, SBC 410ci, Coan turbo 400 5500 stall, Mark williams 9".  3350lbs

Offline Paul New

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Re: Baseline starting tips
« Reply #3 on: May 07, 2022, 06:47:03 AM »
With 23° heads I ran between 28 and 32° depending on the track I was running watch for detonation. One thing to watch for is bolts coming loose if you see this back your timing off add fuel or both

Offline wideopen231

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Re: Baseline starting tips
« Reply #4 on: May 07, 2022, 10:39:02 AM »
Timing I would start at 30* and move up 2 at time till et or mph fell off on a good run. I would read plugs for fuel and of coarse the strap for timing.

As for egt's. A llot of things change that answer. Main is how far down the tube is the sensor. Normally I shoot for 1050 as max with a sensor about 4" much more and temp will drop some. As a rule, once plugs burning all the way around and dwon to first thread I check bearings if they are good then I check my temps at that point. It is safe, but maybe not max power. You can carefully lean a little  watch temp, plugs and time slip from there. Some cars like 1100 and have seen cpl that liked 1150 and like I said some of that was sensor location, some timing and some even cam made a slight difference due to overlap I am guessing.




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Offline Draw 3D

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Re: Baseline starting tips
« Reply #5 on: May 19, 2022, 12:27:01 PM »
On my blown alky SBC, I usually run around 32°-35° but each motor is different. I don't have egt sensors so I go by engine response and plugs, old school.