engine swap on 240sx

[SleepingTalon]

I dunno, it really wasnt under all that much strain to be honest. It was right at about 18psi, maybe 19 for a split second. It did it rather easily too. That car is actually detuned, it can make more. Matt, the dyno chart is in the computer over at the shop. You're exactly right, as soon as the clutch started to slip, the boost was turned down. I dont quite remember how much boost it actually left with, but it was still pretty damn stout! On a side note, even my 20g didnt hold all its power all the way to redline, so I would never expect anything even remotely close outta the stock SR turbo. It's like when I tune a car with a big 16g, they make pretty much the same power/power curve as what Matt's car is makes/is capable of making, but it doesn't have a chance in hell of holding it all the way across the board. I undestand what you're saying though.

[HiPSI]

I dunno, it really wasnt under all that much strain to be honest. It was right at about 18psi, maybe 19 for a split second. It did it rather easily too. That car is actually detuned, it can make more. Matt, the dyno chart is in the computer over at the shop. You're exactly right, as soon as the clutch started to slip, the boost was turned down. I dont quite remember how much boost it actually left with, but it was still pretty damn stout! On a side note, even my 20g didnt hold all its power all the way to redline, so I would never expect anything even remotely close outta the stock SR turbo. It's like when I tune a car with a big 16g, they make pretty much the same power/power curve as what Matt's car is makes/is capable of making, but it doesn't have a chance in hell of holding it all the way across the board. I undestand what you're saying though.

i too own an SR and was running the stock T25, which is why i find it odd to say the least. my car at 14psi on it's best runs would muster ~240whp and had a big falloff after about 5000rpm due to it not being able to keep up with the airflow demands of the motor (that was with the boost holding perfect all the way to the limiter). i really don't see a 60whp deficit being made up with 5-6psi difference on a T25, especially when you're already well outside it's efficiency range and somehow making that power loft and hold. the power of that car sounds way more indicative of something like a BigT28. just seems like that "stock T25" may be stuffed with some goodies he didn't know about?

[SleepingTalon]

i too own an SR and was running the stock T25, which is why i find it odd to say the least. my car at 14psi on it's best runs would muster ~240whp and had a big falloff after about 5000rpm due to it not being able to keep up with the airflow demands of the motor (that was with the boost holding perfect all the way to the limiter). i really don't see a 60whp deficit being made up with 5-6psi difference on a T25, especially when you're already well outside it's efficiency range and somehow making that power loft and hold. the power of that car sounds way more indicative of something like a BigT28. just seems like that "stock T25" may be stuffed with some goodies he didn't know about?

Hmm..I dont know. I'm sure Matt could answer that question better than me. If I recall correctly, it wasnt just throw some boost at it, and fuel tune, there was timing worked in there at some point. It wasn't holding 300whp all the way to redline, that's for sure, but it did infact make 300whp. Im sure we can pull the chart up and look. I'll look at it tomorrow while Im tuning on the dyno. Now you got me curiious! LOL.