i have a 306 with trw 10.13 cr with tfs tw heads tfs stg2 cam track heat intake 75mm tb 24 lb injectors c&l mass air76mm with c&l tube midlength headers h pipe flowmasters 190lph fuel pump aeromotive fuel pressure reg. i got it dynoed today and it put 276.9 rwhp and 283.7 ftlb tq but im having a surge and we found that my intake manifold has a vacum leak between the upper and lower so im fixing that i think its not flat because i keep changing the gasket and it keeps leaking and it was running a little lean because of the vac leak but what else will help out thanks
HELP! want 300+ rwhp
- Thread starter 90lxnotch
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Put a new intake gasket on, while you have the upper off, re-torque the lower again! Clean the maf and be sure everything is good before going to the dyno again. Run 18* timing and about 42psi FP and see what happens. When are u dynoing again?
Consider switching to a 70mm throttle body. I think 75mm is too big for a motor that isn't forced induction or stroked (I have a 70mm on my 347). Also think about a 77mm or 80mm Pro-M MAS, they seem to do better than C&L in all the tests I've seen. Was the dyno done with a wideband O2 sensor? How was your A/F ratio? What is your fuel pressure set at now? Definitely fix any vacuum leaks you have.
NotoriousGT350
Founding Member
Ed C recommended a 75mm TB for my car, a n/a 302 stock shortI've been doing my homework. I have a book sitting in front of me called "5.0L Ford Dyno Tests" by Richard Holdener. On a 5.0L that was modified with H/C/I, the 75mm throttle body produced about 2 less HP starting at about 3500 rpm on up, with about a 3 HP difference at 5000 rpm. The beginning of the chapter "Throttle Bodies: Is Bigger Really Better?" gives a good explaination of proper throttle body sizing, and what exactly it is they do. I'm not going to type the whole thing out, but try out a 70mm or even a 65mm throttle body. Maybe borrow one from a friend or something. If you gain a few HP, great, if not, just swap your 75mm back on no big deal.
mike keirstead
New Member
I ran 12.02 with the STOCK THROTTLE BODY.
I have Gt-40 irons, TFS street intake, Lunati cam, 73 C&L, AFM powerpipe, slicks, 3.73s, 5 speed. 3050 pounds.
Not sure what kind of power I am making, must be near 300 rwhp.
I would say a 70 would be plenty of TB.
Fix the vaccum leak and get a few more runs in. Find a 70 or even a stocker and switch them in between runs.
I have Gt-40 irons, TFS street intake, Lunati cam, 73 C&L, AFM powerpipe, slicks, 3.73s, 5 speed. 3050 pounds.
Not sure what kind of power I am making, must be near 300 rwhp.
I would say a 70 would be plenty of TB.
Fix the vaccum leak and get a few more runs in. Find a 70 or even a stocker and switch them in between runs.
75mm is fine for his combo as far as im concerned. I have that 5.0L dyno test book. That test was done on a dart headed 302 with a gt40 intake. GT40 intake has i believe a 70mm opening. They didnt mention opening up the gt40 inlet for the 75mm TB, so therefore, the test was a wash IMO. His motor combo is a bit wilider than the one in the dyno test. The one in the book made about 335hp at the motor, his combo is good for 315+ to the WHEELS.TheTFS intake has a 75mm opening. Keep the 75mm like I said.
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