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Old 08-20-2019, 11:40 PM   #1
Brad87gt
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Default Some help with new SBF tt combo

Little background first. This engine has exceeded my expectations in N/A form. It made over 500 to the tire and has gone 10.0ís at 134 mph in my 3000lb car with a DR4 transmission. It is 321Ē has Vic jr heads and manifold. Now with the twins it will be 10.5:1 blow thru E85 CSU 750 dual needle carburetor. Cam is a comp billet TC lobe on intake and exhaust 275 @ .020 244 @.050 with a .428 lobe lift 115+3 and 1.7 rocker. I have twin S366 turbos and there will be no Intercooler. I am looking to make 1000 to the tire.

What spark plug would you use for this combo? What rear gear? Transmission will be a proven C4 that has been 5.0ís many many times in a different heavier car. How fast is this combo capable of going? I have had nitrous combos blower combos and N/A this will be my first turbo setup. Thanks for the input.
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Old 08-21-2019, 10:19 AM   #2
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Default Re: Some help with new SBF tt combo

Also can -3 feed lines be used? Or are they too small?
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Old 08-21-2019, 08:00 PM   #3
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Default Re: Some help with new SBF tt combo

3923 autolite.
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Old 08-21-2019, 09:28 PM   #4
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Default Re: Some help with new SBF tt combo

Interesting you suggest a projected tip... I ran a 3924 in N/A trim
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Old 08-22-2019, 12:23 AM   #5
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Default Re: Some help with new SBF tt combo

C4 wonít last, I ran a similar combo and made 1070 tire on 20# at 15* timing. Was using 3.90 gears with a glide. I would still worry about air intake temp without an intercooler. Text for details and pics 3862168593. Canít load pics here.
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Old 08-22-2019, 06:17 AM   #6
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Default Re: Some help with new SBF tt combo

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3923 autolite.
Been using them for years with 30lbs and victor jr.
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Old 08-22-2019, 06:20 AM   #7
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Default Re: Some help with new SBF tt combo

Sell the c4 while you still can get good money for it. Glide 1.69 1st.
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Old 08-22-2019, 08:56 AM   #8
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Default Re: Some help with new SBF tt combo

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C4 wonít last, I ran a similar combo and made 1070 tire on 20# at 15* timing. Was using 3.90 gears with a glide. I would still worry about air intake temp without an intercooler. Text for details and pics 3862168593. Canít load pics here.
Thanks, I will send you a message. I have been thinking more and more about a glide.... I would be happy with anything between 850-1000 at the tire.
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Old 08-22-2019, 09:00 AM   #9
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Default Re: Some help with new SBF tt combo

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Been using them for years with 30lbs and victor jr.
I have had much better luck with autolite plugs in this engine N/A than others.
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Old 08-23-2019, 08:59 PM   #10
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Default Re: Some help with new SBF tt combo

.730" lift? That's a lot more then you need especially with a 242 deg at .050" duration cam. I would start with some 1.5 rockers and change to the 1.7s if unhappy. Try letting the boost do the work first.

Just to give you more info, my cam has the same duration and only .590" lift and uses hydraulic rockers. My seat pressure is only 160 lbs. Much easier on valvetrain parts. 3550lb car that has gone 8.23 at 168 mph.

10.5 comp ratio and no intercooler will limit your timing even with E85.

Overall I'd say you'd be better off with 1.5 ratio rockers and an intercooler.

My car is street/strip so I like to use NGK Iridium plugs, 8EIX? I can verify the plug if you're interested but I use those mainly because they last forever and I want to change plugs regularly.
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Old 08-23-2019, 09:57 PM   #11
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Default Re: Some help with new SBF tt combo

R5671a
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Old 08-23-2019, 10:51 PM   #12
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Default Re: Some help with new SBF tt combo

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.730" lift? That's a lot more then you need especially with a 242 deg at .050" duration cam. I would start with some 1.5 rockers and change to the 1.7s if unhappy. Try letting the boost do the work first.

Just to give you more info, my cam has the same duration and only .590" lift and uses hydraulic rockers. My seat pressure is only 160 lbs. Much easier on valvetrain parts. 3550lb car that has gone 8.23 at 168 mph.

10.5 comp ratio and no intercooler will limit your timing even with E85.

Overall I'd say you'd be better off with 1.5 ratio rockers and an intercooler.

My car is street/strip so I like to use NGK Iridium plugs, 8EIX? I can verify the plug if you're interested but I use those mainly because they last forever and I want to change plugs regularly.
I have 1.7 T&D shafts on the engine currently and the springs on the heads PAC 1225’s are almost new and ironically the N/A cam in it now has the exact same lobe lift so the heads are set up for that amount of lift. Does it need all that lift, probably not, but it makes it much easier not having to change the installed height on the springs.

This engine has 100+ passes on it naturally aspirated. See’s 9,000+ rpm every pass, so the valve train has been proven to be stable. The turbo cam will only go about 8,000. I do understand what you are telling me tho and if I didn’t already ha e the t&d’s and the heads set up with the pac springs for that lobe I would probably tone it down some. 850-1000 HP I will be very happy. Made 505 to the tire n/a.

I am interested in the iridium plug.
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Old 08-23-2019, 11:24 PM   #13
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Default Re: Some help with new SBF tt combo

AR3932.

Powerglide .
C4 will not hold up.
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Old 08-24-2019, 12:31 AM   #14
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Default Re: Some help with new SBF tt combo

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Also can -3 feed lines be used? Or are they too small?
That is too small for a non ball bearing turbo. Borgs need atleast -4 feed.
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Old 08-24-2019, 09:25 AM   #15
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Default Re: Some help with new SBF tt combo

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That is too small for a non ball bearing turbo. Borgs need atleast -4 feed.
Gotcha, I have -3ís plumbed to the valve covers with internal spring oilers. I was going to use those lines as I donít need them anymore. I had the rockers updated with oilers in them. I will get some -4 lines and fittings.
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