Stupid question with an even stupider answer

[ringthree]

Please tell me I'm not insane...

The ridiculously uninformed nature of car people is shocking sometimes so to just confirm my observation please answer the following question.

Car A: Highrevving N/A car running aftermarket turbo at 7 psi's of boost.

Car B: Stock turbo car running 7 psi's (I dont even believe it runs that low stock)

Would comparing these two cars "as equals" be a good comparison?

Remember, if this questions sounds dumb it's just cuz I'm checking my sanity.

[F22-Raptor]

No car turbo'ed from the factory is gonna have a much stronger motor meant to withstand the rigors of a turbo. Plus compression is much lower etc...

[David Draper]

Originally posted by ringthree
Please tell me I'm not insane...

The ridiculously uninformed nature of car people is shocking sometimes so to just confirm my observation please answer the following question.

Car A: Highrevving N/A car running aftermarket turbo at 7 psi's of boost.

Car B: Stock turbo car running 7 psi's (I dont even believe it runs that low stock)

Would comparing these two cars "as equals" be a good comparison?

Remember, if this questions sounds dumb it's just cuz I'm checking my sanity.

Not equal. Assuming they have the same bore and stroke, and the same displacement, the factory turbocharged car would be running a static compression ratio of, for example, 8.5:1 (common ratio, found in MR2 S/C, MR2 Turbo, Supra Turbo, Supra TT), which when running 7 psi would give an effective compression ratio of 12.55:1.

The factory N/A car would be running a static compression ratio of, for example, 11.5:1 (stock GT-S), which when running 7 psi would give an effective compression ratio of 16.98:1.

Therefore, the higher compression of the factory N/A motor will make more use of the boost, providing more power over a wider RPM range than the factory turbo engine. The tradeoff is that the higher compression engine will be less stable, less receptive to increases in boost, and will probably have a shorter life, hence the reason factory engines that are designed for boost will ordinarily run a low 8.0 to 9.0:1 compression ratio.

Ow...headache....leaving.... :)

[larryd]

Originally posted by F22-Raptor
No car turbo'ed from the factory is gonna have a much stronger motor meant to withstand the rigors of a turbo. Plus compression is much lower etc...

WRONG.. the 3sgte or 2jzgte from toyota or 4g63 from mitsubishi are strong built turbo engines.. they will hold more boost up to a point then any non turbo car..

[2000 XYR]

(Actually Larry, I think he meant to put a period after the No. If you pause after the No it makes more sense what he says.)

Anyway. No, not equal IMO.

[ringthree]

Ding ding ding.

Thank you People, The comparison was for Car A = RSX with Greddy turbo running 7 psi vs. Car B = WRX running 7 psi.

The person that was comparing said that it was a "resonable comparison" because they were running the same amount of boost. My head almost exploded when I saw this. Their are some really ignorant people out there. It's scary.

[David Draper]

Originally posted by ringthree
Ding ding ding.

Thank you People, The comparison was for Car A = RSX with Greddy turbo running 7 psi vs. Car B = WRX running 7 psi.

The person that was comparing said that it was a "resonable comparison" because they were running the same amount of boost. My head almost exploded when I saw this. Their are some really ignorant people out there. It's scary.

And if I'm not mistaken, doesn't the WRX run 12-14 psi stock? But, you know those Honda boys :)

[ringthree]

Yes Dave, I think it's like 9 but I pointed that out and it didn't seem to matter to the RSXer.