60 Ft 1.7539 1.7552 1.7371 1.7467
330 Ft 5.4311 5.4269 5.4141 5.4138
1/8 ET 8.527 8.5121 8.4551 8.4658
1/8 MPH 82.54 82.7 82.1 82.57
1/4 ET 13.4228 13.3519 13.2642 13.2348
1/4 MPH 100.7 101.85 103.14 104.42


I have a Buschur Stage 1 with hi-flow cat and flash. 1st run was ran with no boost controller and then the remaining runs were run with Forge UNOS MBC set at 20 pounds. I was hoping for very low 13's or high 12's. Need help figuring out what I am doing wrong, if anything. Thanks

 

I assume you have an 03/04?

If so, then you are making decent power...not great, but not bad. You also are launching VERY well, but your ETs are not reflecting that fact. This points to poor shifting. It could either be your shift speed or the rpm at which you are shifting. It's cool to see that your mph increased noticeably with the MBC at least.

Tell me when you're shifting in each gear. As a frame of reference, my stock time of 13.17 @ 103.89 was only with a 1.92 60'. With any of your 60's, I would have had a 12.9x while you're doing 13.2-13.3, so again, that points to shifting.

 

Nice consistant 60' times. What were the track conditions like? Your times dont look to bad maybe just work on your shifting or turn the boost up a little depending on what gas you are running.

 

Not a big drag racer but I think the track was fine. I did have trouble getting into second once, but the rest were fine. Yes, I have an 03 forgot to say that earlier. Temp was low 70's and dropped to mid to high 60's while there. I was shifting into second at 7000 and third and fourth was 7500. I didn't think that 500 rpm would be a big deal but it is looking like it may be.

 

Shifting into 2nd at 7000 is fine, but shifting the other gears at 7500 is a no-no without cams. Our boost tapers (even with the MBC) significantly by 7500, and the turbo is not efficient at that rpm. In fact, we hit peak WHP at 6800 or so usually, so by 7500, the power really has tapered. Even so, I still recommend that people shift at 7200 for two reasons:

1) You aren't at peak HP at 7200, but the power hasn't dropped off much by this point, and

2) Shifting a little higher (than 6800-7000) puts you at an optimum rpm in the next gear without having to respool the turbo. Now, shifting at 7500 would do this even more so than 7200, but the tradeoff is in how much power you've lost by holding it in gear that long.

Try shifting right after 7000 in 2nd and 3rd. It still may not help if your shift speed is slow, but I can't diagnose that from here.

 

I will try it the next time I go. Thanks

 

Why would shifting at 7500 without cams be a no no? I thought pushing it past 7200 or 7300 on a stock valvetrain in general would be a bad idea. Is the stock stuff able to handle cams and other mods at that high an rpm?

 

The power falls off much earlier so at the track, you would be staying in gear and losing momentum, whereas if you shifted at 7000 you would still fall right back into the sweet spot without losing that momentum from holding the gear to 7500. No one was implying that it was actually "bad" for the car. I have been safely running to 8100 rpm with cams and stock springs/retainers for over 8 months now. So no worries there. Just want to make the most of your powerband, and on an uncammed car the best shift point is roughly 7000 for 2-3 and 3-4.

 

Yeah, what gkania said. The "no-no" part was only in reference to optimum shift points, not safety. We can easily rag these cars out to 7600 in stock form...even 7800, but without cams it's not very useful. With cams, you can hold that power all the way to 8000 just about. AT that point, the limitation is the turbo itself, not the flow of the head.

 

Here's what I ran with BRstg1 + Dynoflash (94oct) 21.5psi:

 

So let me make sure I got this right.....Revving to 8k every now and then WILL NOT do any immediate harm to my engine?? I hope this is true, for I've been to the 8k mark a few times down the strip.

 

Correct, it will not kill your engine.

 

Many people do it on purpose, especially if they have 280s. Are you sure your rev limit is set to 8000? Dynoflashes are set to 7800 unless otherwise requested to be higher...

 

You should be fine, I plan on reving that high once I get my 280s

 

The name of the game is to practice and experiment with your shift points. I have a 03 and with the stock exhaust and later a cat-back, 7000 RPM shifts were the best. When I added a down pipe and a high-flow cat, 7500 RPM shifts were the best. Every Evo responds just a little differently. Just take all the advice given here as a starting point and try out different shift points.