Author Topic: LS1 RX7 build  (Read 530 times)

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Offline toplessFC3Sman

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Re: LS1 RX7 build
« Reply #60 on: August 15, 2017, 09:35:26 AM »
Ha, that sounds like a fun winter project! For a V8 in an FC, where do you think you'll have room to mount the turbo so that it can be fed by both banks? Will it fit between the radiator and the accessory drive? Are equal-length headers a possibility to package?

Offline ITSWILL

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Re: LS1 RX7 build
« Reply #61 on: August 23, 2017, 06:40:46 PM »
One bank will just have a longer run to the turbo, since the turbo will likely go behind the passenger headlight.  I'm not really all that concerned about it with the number of exhaust pulses from a V8. Should I be?
86 Base LS1 w/100 shot
88 TII 20B T70 turbo

Offline toplessFC3Sman

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Re: LS1 RX7 build
« Reply #62 on: August 24, 2017, 11:54:13 AM »
The turbo should be fine, it'll just create a little bit different exhaust residual tuning for one bank vs the other, so at some engine speeds the left bank (or the hottest cyl in that bank) will be richer with hotter exhaust & more prone to knock, and that will shift to the other bank at some speeds. If you're not tuning it to the ragged edge, overall it shouldn't matter much - you'll just notice different cyls getting hot at different speeds.

Offline ITSWILL

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Re: LS1 RX7 build
« Reply #63 on: August 24, 2017, 08:41:46 PM »
I wish I could have 10 egts and 10 lambdas like at work.
86 Base LS1 w/100 shot
88 TII 20B T70 turbo

Offline toplessFC3Sman

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Re: LS1 RX7 build
« Reply #64 on: August 25, 2017, 12:26:38 PM »
Yea, me too! it would make things a lot easier, although trying to implement an in-cyl pressure transducer on a rotary would be tough. You'd need 3 per rotor, and would have to stitch together the traces from each based on rotor position. I've thought about it a few times, but I'm not sure I want to turn a fun hobby into a serious experiment

Offline ITSWILL

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Re: LS1 RX7 build
« Reply #65 on: August 27, 2017, 09:59:22 PM »
Oops...

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On the left is the replacement, center is the good one from my diff, right is busted (notice the replacement has a different spline root without a filet)
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« Last Edit: August 27, 2017, 10:04:46 PM by ITSWILL »
86 Base LS1 w/100 shot
88 TII 20B T70 turbo

Offline murz

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Re: LS1 RX7 build
« Reply #66 on: August 27, 2017, 11:48:34 PM »
That's crazy, you know i wonder if that replacement is stronger like that?
1986 AS GXL Turbo swapped
1991 BB convertible
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Offline toplessFC3Sman

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Re: LS1 RX7 build
« Reply #67 on: August 28, 2017, 09:49:06 AM »
Ouch!  I know that the S5 turbo diffs had different lengths than the S4 (and a difference left vs right), but wasn't aware that there were differences with the S4 shafts