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Syclone LTx conversion..
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TxSy1430
New User
| Posts: 2
| Joined: 07/09
Posted: 07/23/09
05:35 AM
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I have a GMC Syclone that I am thinking of putting an LTx in.
My questions are:
Can I get over 500hp from a n/a motor?
What is a good LTx parts source? (new and used)
How does the LTx hold up with a turbo (10psi)?
Thanks,
Scott
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Posted: 07/23/09
06:20 AM
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Over 500hp n/a? Sure...check out the LT1 Head Shootout in our August issue. With just a 383 and a moderate hydraulic roller cam, both the AFR 195cc Street heads and TEA-ported TrickFlow 200cc castings made over 500hp. A bigger cam and either AFR's Race heads or TrickFlow's new 21-degree heads could easily have improved on those figures, to say nothing of the potential of a 396 and an even larger set of heads (or a solid roller).
When equipped with 4-bolt mains, as Golen Engine Service did for our test motor as well as the blown 383 test we did, the LT1 is very reliable in a boost application. Its traditional head-bolt pattern and iron block make for a formidable competitor. Rick Intrau's turbo LT1 Firebird was running 8.0s for quite some time before the LS1 crowd caught up. Find a good builder, quality components, and ditch the Optispark–then you'll be all set.
http://www.gmhightechperformance.com/tech/0807gmhtp_golen_engine_services_383_lt1_ati_procharger_install/index.html
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TxSy1430
New User
| Posts: 2
| Joined: 07/09
Posted: 07/23/09
07:51 AM
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What years are the best for an LT?
Should I use the stock Sy ecm with code 59 or use an ecm from an LT car?
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Posted: 07/26/09
05:15 PM
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There isn't much difference year to year (aside from the Opti), what you want to pay attention to is where the LT1 comes from...an F-body LT1 has aluminum heads and 2-bolt mains, Impala/Caprice came with iron heads and 2-bolt mains, and the Corvette came with aluminum heads and 4-bolt mains. The LT4 from GS Vettes and a selected few F-bodies had high-flowing heads, raised runner intake manifold, 4-bolt mains, forged rods, and a stronger crank.
Choosing a PCM can be a tricky proposition, OBD II PCMs are much faster and easier to tune compared to PROM or OBD I. We are going to be testing an LS1 PCM conversion for LT1 and TPIs soon, which also takes advantage of the LS1's distributorless ignition.
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