Just wanting to get some feedback on anyone who has done between 500-550rwhp before and after cam dyno runs? Anyone done this? Thanks, your help is very appreciated.
If you go to his website, theya re all listed.Nightmare6 said:Tony, if you don't mind could you tell me exactly what you have done to your car to run those times.
Thanks for the response. Would you happen to have any dyno runs that I could see to compare before and after. I would really appreciate it. If you can't post the sheets, what numbers did you do before and after...both hp and tq. Thanks.element217 said:
If you go to his website, theya re all listed.
I installed cams and did not see a hp gain but saw a huge gain in torque. The cams were never tuned for power though, as they were tuned for idle, so who knows.
He threw them on with the 60k service after he did the single, so I don't know. I'm not sure if anyone's run cams on stock twins.TT_6SPD_95 said:Thanks for all the responses everyone.
Ryan, did he try the 264's on the stock twins? What power levels was he making first, and then did he gain anything? Thanks.
Thank you very much John for the info. That helps out greatly.John H said:Geez, it always amazes me how people give false advice on topics they know nothing about.
For the most part, Steve is on the ball and running with it.
To make corrections (to others), turbo spool will always decrease. For 264s the average is a 500rpm later spool. Larger cams will not increase the amount of boost your engine can handle. No one has ever posted an actual dyno sheet or given a dyno account of different cams on a stock twin car and I've been reading all the Supra crap since before the MKIV list, i.e. SOGI.
Tony, if you want to be a pioneer, I would opt for the HKS 254 cams. 264s are more than plenty for even the output of the largest twins/singles. On stock twins the gain would be minimal, but with the obvious flow your turbos are making, the 254s should give an increase. Over 15rwhp? Not likely. 10-15rwhp? Maybe. The increase in peak torque will be higher as Steve noted, but the torque under the curve will decrease as the peak torque will be higher in the rpms.
Another very interesting aspect which I'm not sure if you've taken into consideration is your use of nitrous. The larger cams will definitely increase your rwhp while on nitrous as opposed to running stock cams.
I assume you're talking about me...John H said:Geez, it always amazes me how people give false advice on topics they know nothing about.
Cams are not something I know nothing about, but I don't know a whole lot. That is why I qualified my comment with I think rather than irrefutably.I think you get the most power from cams when you do headwork and valves, but you should gain torque and likely spool the turbos up better with the cams. It will make the car sound really nasty.
I might try doing the HPF mod, but I am very close right now without the extra boost...I am doing 20lbs at the track now. Once I get to the 10's without the extra boost then I will do the HPF mod and see what I can do then. At that point I will just be waiting for the stock twins to run out of breath...not sure when that will be though.burnmacs said:If your goal is 10's on stock twins how about you hard wire the wastegate shut. Talk to Chris Bergemann about this one, he was running 2 bar on the stock twins and said it pulled like his T-78. Unfortunately a BOV hose popped off killing the twins en route to the track.
Agreed. After looking the size of the turbo flanges on the exhaust manifold, and the size of the turbos themselves, I now believe that spending lots of money and time on the stock twins is a complete waste.Lagtime said:I wonder if a longer duration cam on the exhaust side wouldn't exacerbate the potential problem of exhaust gas reversion into the cylinders. Cars on stock twins have a huge pressure ratio, one of the reasons I suspect so many BPU cars run better on high octane fuel, reversion due to backpressure causing the incoming A/F mixture to preignite. Higher octane gas helps prevent this.
If you hold the exhaust valve open longer, on a setup that already has trouble flowing (the stock exhaust manifold and stock turbo exhaust side) you may end up with more exhaust flow back into the cylinder, rather than better cylinder emptying on the exhaust stroke.