spook Donating Members 180 Member For: 16y 7m 19d Gender: Male Posted 09/06/20 01:37 AM Share Posted 09/06/20 01:37 AM I get that there's many variables. In reference to the OP, it does not take much for the backend to step out in 3rd (ZF) with 285 rears if that helps for comparison. 33 minutes ago, El Andrew said: Are you still running the factory dump or cat? Full XForce setup. The usual mods done to support that level of power though still original turbo (on borrowed time?) Link to comment Share on other sites More sharing options...
gaz097 Bronze Donating Members 1,751 Member For: 13y 4m 2d Posted 09/06/20 02:46 AM Share Posted 09/06/20 02:46 AM Ported wastegate? If not 20psi is probably minimum it can run, and it's tuned accordingly Link to comment Share on other sites More sharing options...
spook Donating Members 180 Member For: 16y 7m 19d Gender: Male Posted 09/06/20 02:58 AM Share Posted 09/06/20 02:58 AM Yep, ported along with Turbosmart actuator Link to comment Share on other sites More sharing options...
Romulus Donating Members 1,279 Member For: 19y 10m 19d Location: Perth Posted 09/06/20 11:36 AM Share Posted 09/06/20 11:36 AM On 08/06/2020 at 6:20 PM, Puffwagon said: A restriction can drastically change how much power is made from 20psi. Some tunes will push the parts way outside their efficiency zone which is ok to a degree, but will give lower numbers compared to a higher efficiency part. Examples: Stock cooler vs large tube and fin front mount, stock exhaust/cat vs turbo back 4 inch, stock crossover vs turboside cai, etc etc. A dyno readout can also vary quite a bit. At the end of the day it's running 20psi and providing the tune is safe/ballpark, the number doesn't matter. Fwiw, imho 20 psi is too much for a stock motor. It might be fine for years...or not. Dunno, my G6ET ran 20psi boost, stock motor with valve springs, made 511rwkw on E85. Did around 20k with it before I reverted it back to stock and sold it. A BA running 20psi through a build 4 speed (I assume) would make 350-380rwkw on U98 with supporting modifications. Link to comment Share on other sites More sharing options...
k31th less WHY; more WOT Site Developer 28,991 Member For: 16y 7m 13d Gender: Male Location: Melbourne Posted 09/06/20 11:37 AM Share Posted 09/06/20 11:37 AM why would a G6ET make 20psi and 511 on E85 but a BA only make 350-380 (161-131 less kW at the wheels) on 98? that's some weird figures. Link to comment Share on other sites More sharing options...
Puffwagon Puff Gold Donating Members 15,901 Member For: 9y 9m 25d Gender: Male Location: South Australia Posted 09/06/20 11:56 AM Share Posted 09/06/20 11:56 AM 3 minutes ago, Romulus said: Dunno, my G6ET ran 20psi boost, stock motor with valve springs, made 511rwkw on E85. Did around 20k with it before I reverted it back to stock and sold it. You quoted my whole thing so it's hard to accurately respond. I'm guessing it's about my opinion about 20psi on a stock engine so I'll talk about that. I still wouldn't recommend pushing a stock engine there if care is given for the engines health. Sure you can do it but I wouldn't recommend it. Link to comment Share on other sites More sharing options...
gaz097 Bronze Donating Members 1,751 Member For: 13y 4m 2d Posted 09/06/20 11:52 PM Share Posted 09/06/20 11:52 PM why would a G6ET make 20psi and 511 on E85 but a BA only make 350-380 (161-131 less kW at the wheels) on 98? that's some weird figures.ManifoldsMotor healthTune at its limit vs safe cause rods going bang bang. Zf vs btr Link to comment Share on other sites More sharing options...
k31th less WHY; more WOT Site Developer 28,991 Member For: 16y 7m 13d Gender: Male Location: Melbourne Posted 10/06/20 12:17 AM Share Posted 10/06/20 12:17 AM still don't think that accounts for the difference, but yes, those things could contribute. Link to comment Share on other sites More sharing options...
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