coreymoe210
New Member
Trying to get some numbers of the 79mm or 75mm pulley from VMP. Pros and cons on either, if anyone is running these pulleys.
Thanks
Thanks
VMP 75mm or 79mm pulley numbers?
- Thread starter coreymoe210
- Start date
Made 633rwhp and 558rwtq on 91 fuel with the 79mm Gen 2 stage 3 kit
Am making now on E85 728 RWHP and 624 RWTQ
I'd say your dyno is a little happy... I know how much timing it takes to make 630whp w/ 79mm pulley and 91 won't handle it. I also find it hard to believe you gained almost 100whp by just switching to E85. I highly doubt a stock pump w/ a BAP will support 700whp on E85 to boot!
Don't take this the wrong way, but get to the track and see what kind of mph you end up with before you etch your dyno numbers in stone.
OP a 79mm w/ CAI is about the most your going to want to run on a stock motor. I went 10.60's at 131 on a 79mm pulley with heavy 18" rims dragging me down...
It was at 15° timing when I ran 91
My E85 is running 22° timing.
My 91 dyno was a different dyno than my E85 dyno, so that may explain the nearly 100 hp increase.
Even if both are reading high, say 30 hp that's still 600 on 91 and 700 on E85
I went to the track the other day but I am out of gear probably 1 to 200 feet from the finish line (maybe more), according to an online calculator, with 3.31 gears, 4th gear ratio at 1.32 and my tires being 295 35 18 (26.1" tall) 4th gear runs out at 126 miles per hour at 7,100 rpms, I am getting to 7k and holding because I really don't have a lot of time to shift into 5th, at that speed distance goes by fast.
I am looking at a set of 305 45 18 like these
http://m.summitracing.com/parts/mtt-3580
I would be out of 4th gear at 139 miles per hour, so this is next on my mod list, a set of these tires and an extra set of 18" wheel's.
I don't take it wrong don't worry but I don't see a dyno reading way off, even if you took off 50 hp from my E85 dyno that's 678 rwhp but I am betting it's not off that much at all.
Soon I will have my tires and get back to the track for some better times.
I'm thinking it's more like 678 on E85...
That is my track tire. My D/D tires are the same size 555Rs.
+1. Happy dynos make owners sad when the track disagrees.
Doesn't make me sad, I am happy with a 670-690 number, to be honest that's what I expected when I went to the dyno, 728 was a shock, when I get some good tires and am not running out of gear I will know better what the car is making.
You may be better off posting it for the general public rather than in our forum. You're welcome to do it here, but people generally come here for things addressed directly to us.
Yes, your 91 number is high. 93, yes. 91....take about 25 hp off. Most 91 is garbage.
For what it's worth, we run consistent 10.40's on an 82mm on our 2015 GT. We don't use pump gas to do it. Its an auto. Full weight car, all the way down to a baby seat.
thanks
bj
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