Author Topic: What would you do?  (Read 4990 times)

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Offline Forzfed

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What would you do?
« on: November 17 2015, 12:40:00 PM »
So I'm rebuilding my 4.1 and thinking of dropping a smaller cam in it so I don't have to rev it that high.  Buzzing the motor past 6300rpm I can rip off mid 11's on pump gas.  I use to have 9:1 compression but the last guy that machined the motor got me diamond pistons that took me down to 8:1.  I would like to get the compression up but not looking forward to buying new pistons.  That is why I thought I might drop a smaller cam in.  Anyone know if I can get a thinner head gasket?  Should I shave some off the heads?  What would you guys do?

Offline Steve Wood

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Re: What would you do?
« Reply #1 on: November 17 2015, 01:12:34 PM »
I would buy the thinnest shims shims that Jason sells if they fit 4.1's, and take some off the heads, myself.

if Flat tappet, I would just as soon have a cam with a duration around 208 but a 212 is okay with a few extra inches.  I see no point in revving over 5800...I will take boost over rpm any day.

If it hooks, high tens should not be a problem with the right turbo
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Offline williambavila

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Re: What would you do?
« Reply #2 on: November 17 2015, 03:26:16 PM »
I would turn up the boost and call it good.  :rock:

Offline Forzfed

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Re: What would you do?
« Reply #3 on: November 17 2015, 04:08:35 PM »
I currently have a 224/224 roller in it.  I was thinking of going with Full Throttle's 215/220 roller.  I was thinking a little bigger than 212/212 because it of the extra cubes of the 4.1.

Offline Scoobum

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Re: What would you do?
« Reply #4 on: November 17 2015, 04:52:05 PM »
That's a 9/11 in that car. :rock: What stall? What turbo and exhaust housing size? What heads are on it?
Hard work pays off, dreams come true. Bad times don't last, but BAD GUYS do!

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Offline Forzfed

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Re: What would you do?
« Reply #5 on: November 17 2015, 05:08:57 PM »
It has a 9/11 3200 with champion ported steel heads.  The turbo is a CPT-66 S trim with .63 exhaust housing.

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Re: What would you do?
« Reply #6 on: November 17 2015, 05:17:38 PM »
It has a 9/11 3200 with champion ported steel heads.  The turbo is a CPT-66 S trim with .63 exhaust housing.

With the cubes you've got I assume it spools well. How much boost have you put to it so far?
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Offline Forzfed

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Re: What would you do?
« Reply #7 on: November 17 2015, 08:24:22 PM »
Most it has seen was 22psi and you could tell it launched a lot harder!  It spools pretty good.  I can still break the drag radials loose.

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Re: What would you do?
« Reply #8 on: November 17 2015, 08:46:40 PM »
Most it has seen was 22psi and you could tell it launched a lot harder!  It spools pretty good.  I can still break the drag radials loose.

You've got more turbo...more cubes...and a convertor when locked that will have a lower slip percentage than mine. Bump the boost up to 26 psi and dial in your low gear fueling and timing. Use race gas. You can run silly amounts of low gear timing...and to date I haven't seen a hint of KR with it. As far as compression ratio listen to Steve or others who have messed with it. Contact Bison for cam selection. He can custom grind one for you.
Hard work pays off, dreams come true. Bad times don't last, but BAD GUYS do!

RIP Scott Hall AKA Razor Ramon

Offline TexasT

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Re: What would you do?
« Reply #9 on: November 17 2015, 09:01:11 PM »
With that low Cr more boost would be in my future and 26psi would be a stepping stone. I'd keep turning it up probably past 30 if you can keep it from retarding the timing or seeing any knock.
Rich

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Offline Scoobum

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Re: What would you do?
« Reply #10 on: November 17 2015, 09:09:55 PM »
With that low Cr more boost would be in my future and 26psi would be a stepping stone. I'd keep turning it up probably past 30 if you can keep it from retarding the timing or seeing any knock.

Jack Cotton sold/sells 66's. He'd be able to tell ya' where they run out of steam. My guess would be 28 with his heads/cam.
Hard work pays off, dreams come true. Bad times don't last, but BAD GUYS do!

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Offline Steve Wood

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Re: What would you do?
« Reply #11 on: November 17 2015, 10:17:56 PM »
I bought that turbo from Jeremy several years ago.  28 is no problem
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