All things considered, I'd be ok with that.
I think I am too. trap speed in the 1/8 is 96mph maybe more if I shifted into 4th...
Cut and paste?For those of you that have seen dyno graphs before.... what's the deal with mine peaking so early? Anything I can do about that short of a cam change?
If he's only seeing 6 psi at redline with 9 psi max, I'd doubt it's a charge temp issue. Sounds to me like the blower is undersized,I wonder if over spinning the blower causes too much heat or even more parasitic loss?
The HP number seems low for gt40's , cam and intakr, but the TQ numbers tell the story, along with the 96 mph trap speed. My car traps 92 mph in the 1/8 running 7.5X's, and finishes in the 1/4 at 11.8X's. I think you should be happy and proud!
Joe
If he's only seeing 6 psi at redline with 9 psi max, I'd doubt it's a charge temp issue. Sounds to me like the blower is undersized,
Yep, me too. I'm sure there is some degree of heat generated. Would be cool to see an IAT datalog, I'm sure he has one.Just thinking out loud.
Joe
Not sure about the springs.... the machine shop put them in but I believe they are comp's they pick them specifically for the build and a 7000 RPM shift the bottom and put together for a 7000 RPM shift as well but once I put the supercharger on there it really drug the powerband downUsually the e cam maxes at around 5500. What valve springs are you running? You could try retarding the cam a couple degrees. Looking at your graph again I think Noobz idea of boosting the fuel pump and ignition might clean it up a little up top. With the blower spinning so hard and creating heat you're loosing a little up there also(which you already know). A cam change may help a little but I don't think that's going to change the powerband significantly and wouldn't justify the time/effort/expense to change.
If you check back earlier in the thread I did Port the blower myself it's not nearly as nice as one of those s ported blowers but I did notice a difference in the amount of pressure it generated...Might be a good idea to consider having the M90 ported to get that efficiency rating up a little? The M90's are great little torque makers, but they do get hot. My last Allen kit used an "S Ported" Gen III M90 that I was over spinning to the tune of 9-10psi on a basically stock 4.6 PI engine and even through a 4R70W and IRS rear end it managed to put out 343RWHP/389RWT on a Mustang Dyno.
Now....granted, it was sporting an air to water intercooler, but the system wasn't very efficient. I was still seeing 210-220 degree ACT's by the end of the track.
What are your ACT's?
I would be forced to remake every bracket on the setup to do that, including a different radiator/fan setup... here is a pic of the front dress.How many lbs of boost were you making with that 1.9" pulley? I guarantee you're slipping that belt.
I had a 2.35" 8-rib on mine and without a little VHT on the belt, or pulley itself, it would slip like crazy
If you're seeing 130-degree's at the top of your pull, that ain't ****.
I think the problem you're having at this point, is that you either aren't spinning the blower fast enough, or you're slipping your current set up.
I would seriously consider running the blower on a separate accessory drive (if you aren't already) and run a larger crank pulley, instead of that tiny blower pulley. Vortech makes a nice 8" crank set up that'll get that blower moving and allow you to step up to a blower pulley with a little more surface area to it.
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?