STS Dyno Number Low
Originally Posted by 99Z28LS1
i know there are a lot of people having problems making anything over 80mm fit in the back of fbaodys
you guys are telling him to go bigger turbo to get bigger #'s, and he is still on the stock heads! I don't think the bigger turbo is really going to gain him much with out changing those out, Right? Or am I wrong
Originally Posted by Zombie
I'm suprised no body has said it yet, but the turbo is WAY too small for that engine. A t76 is really small for that engine. Last time I talked to Jose he said they have a 80mm T4 flanged setup with something like a TM1 .81 a/r available. I was going to go to it but I want to work some more issued out on my car first with spooling on the line.
If you want a cheap easy setup, get some 317 6.0 heads (stock is fine). It will lower the compression more, the lower the better really, I personally like 7.8:1 - 8.5:1. If you even think about worrying about losing power from lowering the comp i'm gonna smack you, take your 408 and install it in my car. Heads help, but that is not your issue, it's the turbo. Stock heads on a 408 is not a great combo, but i'd sooner put a better matched turbo on and worry about heads later.
You want really pathetic dyno numbers? My car made 470 uncorrected on a mustang dyno at 14psi through my th400. The result is in the sig, mid 10's in a heavier than stock car. I'm eventually going to do heads on my car in the future, but that is not something I'm worried about at this time due to the cost involved (new turbos are cheaper and easier to install and make more power).
If you want a cheap easy setup, get some 317 6.0 heads (stock is fine). It will lower the compression more, the lower the better really, I personally like 7.8:1 - 8.5:1. If you even think about worrying about losing power from lowering the comp i'm gonna smack you, take your 408 and install it in my car. Heads help, but that is not your issue, it's the turbo. Stock heads on a 408 is not a great combo, but i'd sooner put a better matched turbo on and worry about heads later.
You want really pathetic dyno numbers? My car made 470 uncorrected on a mustang dyno at 14psi through my th400. The result is in the sig, mid 10's in a heavier than stock car. I'm eventually going to do heads on my car in the future, but that is not something I'm worried about at this time due to the cost involved (new turbos are cheaper and easier to install and make more power).
I think the 408 cubic inches OUTFLOW the turbo into an area of high inefficiency... I don't think it will make 600 rwhp... On a 346 a T-70 will, but not on a 408... Not properly matched, IMO... Hell, even a 346 will outflow the T-70 around 600+ a little rwhp... I tried to push one (MPT-70) myself, but needed the T-76GTQ.
Motor's being choked by the turbo, IMO.
I appreciate all the help.So what turbo do you guys think I need to use.I have a set of 317 I can get cnc here locally or should I buy new heads also and what kind.Like I said my compression is around 9.5 with stock heads and.040 headgaskits.
Originally Posted by sevanseriesta
you guys are telling him to go bigger turbo to get bigger #'s, and he is still on the stock heads! I don't think the bigger turbo is really going to gain him much with out changing those out, Right? Or am I wrong
