1990 DSM Turbo Talon vs. h/c C5
11-05-2010, 02:01 PM
#21
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He needs to lean it out to a consistent low 11 AFR, maybe a touch of extra fuel before redline, and add as much timing as it will take before it starts to knock.
On only 21psi he should be able to get a lot more timing in it when the AFR is dialed in.
11-06-2010, 01:37 AM
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Haven't dyno'd on the current setup, but the old pump gas numbers were 428whp/369wtq. Expecting about 500/460 with the recent changes. Thats going to be close to the max though, i'm running out of turbo.
Last edited by Beans; 11-06-2010 at 01:42 AM.
11-07-2010, 12:58 AM
#25
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After all said and done I plan on having about as much RWHP as you before i add spray. 
11-07-2010, 08:02 PM
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11-07-2010, 08:37 PM
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11-08-2010, 12:58 PM
#30
Absolutely not, like said in later post, many factors can determine how that particular engine got to that particular level of over pressurization. One example I equate to those who may not understand.
8 PSI in a 346 CID LS1 will not make the same level of PSI in a LS2 or LS3 based motor if you simply take the same power adder and swap it over. Often, if left unchanged, the PSI should be lower. How much lower will depend on other factors as well.
8 PSI in a 346 CID LS1 will not make the same level of PSI in a LS2 or LS3 based motor if you simply take the same power adder and swap it over. Often, if left unchanged, the PSI should be lower. How much lower will depend on other factors as well.
11-08-2010, 01:24 PM
#32
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Considering this is a convo about turbos, think about it this way:
A 30R car on 30psi with pump/meth can hit about 500whp.
A 35R car on 30 psi with pump/meth can hit about 600whp.
The only difference is turbo flow. When comparing a 30R which flows 50-55lbs/min to a 35R which flows 65lbs/min, you can see why at the same level of psi there is a BIG difference in flow. It can get very complicated, but the bottom line is, pressure has nothing to do with flow.
11-08-2010, 01:37 PM
#33
He's thinking more along the lines of a S/C, where the blower will make less psi on a larger displacement engine, all other things equal.
Considering this is a convo about turbos, think about it this way:
A 30R car on 30psi with pump/meth can hit about 500whp.
A 35R car on 30 psi with pump/meth can hit about 600whp.
The only difference is turbo flow. When comparing a 30R which flows 50-55lbs/min to a 35R which flows 65lbs/min, you can see why at the same level of psi there is a BIG difference in flow. It can get very complicated, but the bottom line is, pressure has nothing to do with flow.
Considering this is a convo about turbos, think about it this way:
A 30R car on 30psi with pump/meth can hit about 500whp.
A 35R car on 30 psi with pump/meth can hit about 600whp.
The only difference is turbo flow. When comparing a 30R which flows 50-55lbs/min to a 35R which flows 65lbs/min, you can see why at the same level of psi there is a BIG difference in flow. It can get very complicated, but the bottom line is, pressure has nothing to do with flow.
http://www.turbobygarrett.com/turbob...o_tech103.html good basic info.
Last edited by BlackScreaminMachine; 11-08-2010 at 01:48 PM.
11-10-2010, 09:34 PM
#34
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He's thinking more along the lines of a S/C, where the blower will make less psi on a larger displacement engine, all other things equal.
Considering this is a convo about turbos, think about it this way:
A 30R car on 30psi with pump/meth can hit about 500whp.
A 35R car on 30 psi with pump/meth can hit about 600whp.
The only difference is turbo flow. When comparing a 30R which flows 50-55lbs/min to a 35R which flows 65lbs/min, you can see why at the same level of psi there is a BIG difference in flow. It can get very complicated, but the bottom line is, pressure has nothing to do with flow.
Considering this is a convo about turbos, think about it this way:
A 30R car on 30psi with pump/meth can hit about 500whp.
A 35R car on 30 psi with pump/meth can hit about 600whp.
The only difference is turbo flow. When comparing a 30R which flows 50-55lbs/min to a 35R which flows 65lbs/min, you can see why at the same level of psi there is a BIG difference in flow. It can get very complicated, but the bottom line is, pressure has nothing to do with flow.
Should i add that, this example applies to a smaller engine along the lines of a 2.0 liter(not saying your wrong, im just adding). A bigger engine, different cams, the flow of the head, etc can change the psi, or pressure ratio, needed for that. Same turbo on 2 completely different engines, can, and will produce the same amount of power. Best way to look at it, is that PSI, is just a measure of restriction, not power level, but of course if you turn up the PSI you will make more power, turn it up beyond a compressor efficiency and you wont make more power, and only create more heat.
